CN111546839A - Low-speed running prompt tone and tire pressure detection integrated device and method for electric automobile - Google Patents
Low-speed running prompt tone and tire pressure detection integrated device and method for electric automobile Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0401—Signalling devices actuated by tyre pressure mounted on the wheel or tyre characterised by the type of alarm
- B60C23/0403—Mechanically generated audible signals, e.g. by buzzer or whistle signals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0427—Near field transmission with inductive or capacitive coupling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q5/00—Arrangement or adaptation of acoustic signal devices
- B60Q5/005—Arrangement or adaptation of acoustic signal devices automatically actuated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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Abstract
The invention discloses a low-speed running prompt tone and tire pressure detection integrated device and a method for an electric automobile, wherein the device comprises a power supply module, a CAN module, a master control module, a storage module, a tire pressure detection module and a display module, wherein the master control module is respectively connected with the power supply module and the CAN module; the invention has the advantages that: low-speed driving sound and tire pressure detection are integrated, research and development cost is reduced, occupied space in a vehicle is reduced, and resource waste is reduced.
Description
Technical Field
The invention relates to the field of electricity, in particular to a low-speed running prompt tone and tire pressure detection integrated device and method for an electric vehicle.
Background
Intelligent control (intelligent controls) is an automatic control technique that can autonomously drive an intelligent machine to achieve a control objective without human intervention. The rapid development of information technology and computing technology and the development and interpenetration of other related subjects also promote the continuous deepening of control science and engineering research, and the development of a control system to an intelligent control system becomes a trend.
When an electric vehicle (a pure electric vehicle, a hybrid electric vehicle, a fuel cell vehicle, etc.) is started in a pure electric mode or runs at a low speed, the average vehicle external noise is obviously reduced compared with the traditional internal combustion engine vehicle, so that other users of roads, including pedestrians, bicycles, etc., especially blind people and people with visual disorder are not easy to perceive the approach of the vehicle, thereby easily causing traffic accidents.
In addition, high speed tire burst accounts for a large portion of traffic accidents. After monitoring the tire pressure of the vehicle, the likelihood of a tire bursting at high speed will be reduced. TPMS (tire pressure monitoring system), as a configuration for improving driving safety, is very popular in foreign vehicle models, whether traditional vehicles or electric vehicles, and in recent years, domestic vehicle models are continuously equipped with tire pressure monitoring, and some vehicle models are still lack of tire pressure monitoring.
In the prior art, the low-speed driving sound prompt and the tire pressure detection of the electric automobile are controlled by separate systems. Chinese patent publication No. CN109703455A discloses an environment-adaptive low-speed running warning system and method for an electric automobile, which consists of a vehicle speed signal acquisition unit, a gear signal acquisition unit, an environmental noise acquisition unit, a calculation and processing unit and a loudspeaker module; the calculation and processing unit synthesizes a basic noise signal simulating the operation of the engine according to the vehicle speed signal and the gear signal, carries out influence correction on the basic noise signal according to the driving environment noise signal, and synthesizes an operation sound signal simulating the traditional engine; the speaker module generates sound to safely remind pedestrians on roads near the vehicle according to the running sound signal of the synthetic simulation traditional engine. According to the invention, by collecting the running environmental noise and correcting the alarm sound of the low-speed running warning system, the problems that the environmental noise pollution is caused by a larger alarm sound in a quiet environment and the alarm prompting effect is not obvious when the alarm sound volume is small in a noisy environment are solved. However, low-speed driving sound and tire pressure detection are not integrated, so that research and development cost is increased, more space in a vehicle is occupied, and resource waste is caused.
Disclosure of Invention
The invention aims to solve the technical problems that the electric automobile system in the prior art does not integrate low-speed driving sound and tire pressure detection, so that the research and development cost is increased, more space in an automobile is occupied, and the resource waste is caused.
The invention solves the technical problems through the following technical means: a low-speed running prompt tone and tire pressure detection integrated device for an electric automobile comprises a power supply module, a CAN module, a main control module, a storage module, a tire pressure detection module and a display module, wherein the main control module is respectively connected with the power supply module and the CAN module;
the tire pressure detection module comprises a chip U2, a resistor R13, a resistor R15, a resistor R16, sequentially numbered resistors R19 to R24, an inductor L1, an inductor L2, an inductor L3, a filter L4, a triode Q3, a diode D2, a capacitor C2 and a capacitor C2, wherein the capacitor C2, the inductor L2, the filter L2, the capacitor C2 and the capacitor C2 form a filter circuit, the inductor L2, the capacitor C2, a resistor L2 and a low-noise amplifier, and the low-noise amplifier are sequentially connected with the chip U2 and the filter.
The main control module receives the instruction information from the electric vehicle CAN bus through the CAN module, finally sends out the sound of warning prompt through the storage module, the tire pressure detection module detects the tire pressure data, the filter circuit and the continuous networking circuit filter noise, the low-noise amplifier enlarges the transmission distance, an external low-noise amplifier is avoided, the complexity and the cost of the system are reduced, the tire pressure detection module and the storage module enable the system to integrate the tire pressure detection function and the low-speed running prompt sound function through sharing the main control module and the CAN module, the use of devices is reduced, the research and development investment of an individual system is reduced, the research and development cost is reduced, less space in a vehicle is occupied, and the resource waste is reduced.
Preferably, the twelfth pin of the chip U2 is connected to the twenty-fourth pin of the main control module through a resistor R21, the thirteenth pin of the chip U2 is connected to the seventeenth pin of the main control module through a resistor R23, the sixteenth pin of the chip U2 is connected to the twentieth pin of the main control module through a resistor R24, the seventeenth pin of the chip U2 is connected to the twenty-first pin of the main control module through a resistor R22, the eighteenth pin of the chip U2 is connected to the twenty-third pin of the main control module through a resistor R20, and the nineteenth pin of the chip U2 is connected to the twenty-second pin of the main control module through a resistor R19; one end of a capacitor C26 is connected to the twenty-second pin of the chip U2 and one end of an inductor L2, the other end of the inductor L2 is connected to the second pin of the filter L4 through a capacitor C22, the first pin, the third pin, the fourth pin and the sixth pin of the filter L4 are all grounded, the fifth pin of the filter L4 is sequentially connected to one end of a capacitor C21 through a capacitor C20 and a capacitor C21, one end of the capacitor C21 is connected to one end of the inductor L21, the other end of the capacitor C21 is connected to the emitter of the transistor Q21 and grounded, the other end of the inductor L21 is connected to one end of the capacitor C21, one end of the resistor R21 and one end of the resistor R21 are grounded, the other end of the resistor R21 is connected to the base of the transistor Q21 and the anode of the diode D21, the other end of the diode D21 is connected to the ground, the VCC R21 and one end of the capacitor C365 _ V21 and one end of the capacitor C21. The other end of the capacitor C19 is grounded; one end of a capacitor C28 is connected with the base electrode of the triode Q3, the other end of the capacitor C28 is connected with the tire pressure detection sensor through an inductor L3, a capacitor C29 and a capacitor C30, the tire pressure detection sensor is arranged in the tire, one end of a capacitor C33 is connected to a connecting line of the capacitor C29 and the capacitor C30, and the capacitor C33 is grounded.
Preferably, the memory module includes a chip U1, a sequentially numbered resistor R1 to R7, a sequentially numbered capacitor C1 to C12, an inductor FB1, an inductor FB2 and a resistor VR1, one end of the resistor R4 is connected to the sixty-first pin of the main control module, the other end of the resistor R4 and one end of the resistor R3 are connected to the first pin of the chip U1, the first pin of the chip U1 is connected to the second pin of the chip U1, the third pin and the fourth pin of the chip U1 are connected to ground, one end of the resistor R5 is connected to the twenty-seventh pin of the main control module, the other end of the resistor R5 is connected to the fifth pin of the chip U1, one end of the resistor R6 is connected to the twenty-sixth pin of the main control module, the other end of the resistor R6 is connected to the sixth pin of the chip U6, the other end of the resistor R6 is connected to the power supply 12 VCC, the other end of the resistor R6 is connected to the seventh pin of the chip U6 and the capacitor C6 is grounded, one end of the capacitor C5 is connected with the eighth pin of the chip U1 and grounded, and the other end of the capacitor C5 is connected with the ninth pin of the chip U1 and the tenth pin of the chip U1; one end of the capacitor C6 is grounded, and the other end of the capacitor C6 is connected with the eleventh pin of the chip U1; one end of the capacitor C8 is connected with the twenty-fifth pin of the main control module, the other end of the capacitor C8 is connected with the twelfth pin of the chip U1, and the fourteenth pin of the chip U1 is connected with one end of the capacitor C10;
one end of a capacitor C11 is connected with a fifteenth pin of a chip U1 and a power supply VCC12V, one end of a capacitor C12 is connected with a sixteenth pin of a chip U1 and a power supply VCC12V, one end of a capacitor C9 is connected with an eighteenth pin and a twentieth pin of a chip U1, the other end of the capacitor C9 is connected with a seventeenth pin and a twenty-first pin of a chip U1, one end of an inductor FB2 is connected with one end of a capacitor C9, and the other end of the inductor FB2 is connected with one end of a capacitor C7 and the positive end of a horn; one end of a capacitor C3 is connected with the twenty-sixth pin and the twenty-second pin of the chip U1, the other end of a capacitor C3 is connected with the twenty-fifth pin and the twenty-third pin of the chip U1, one end of an inductor FB1 is connected with the other end of a capacitor C3, the other end of an inductor FB1 is connected with one end of a capacitor C4 and one end of a resistor VR1, and the other end of a resistor VR1 is connected with the negative end of a horn; one end of a capacitor C1, one end of a capacitor C2 and one end of a resistor R3 are all connected with a power supply VCC12V, a twenty-seventh pin and a twenty-eighth pin of a chip U1 are all connected with one end of a capacitor C1, and the other end of a resistor R3 is connected with the other end of a resistor R4; the other end of the capacitor C11, the other end of the capacitor C12, the other end of the capacitor C7, the other end of the capacitor C4, the other end of the capacitor C1, the other end of the capacitor C2, the nineteenth pin of the chip U1 and the twenty-fourth pin of the chip U1 are all grounded.
Preferably, the power module includes a main power supply unit and a wake-up unit, the wake-up unit includes a capacitor C215, a resistor R203, a capacitor C216, a resistor R204, a transistor Q202, a transistor Q203, a resistor R205, a capacitor C217, and a resistor R206, one end of the capacitor C215 is connected with one end of the resistor R203 and is connected with a KL15 signal line of the electric vehicle, the other end of the resistor R203 is connected with a base of the transistor Q202, one end of the capacitor C216 and one end of the resistor R204 are both connected with the other end of the resistor R203, a collector of the transistor Q202 is connected with a collector of the transistor Q203, a base of the transistor Q203 is connected with one end of the resistor R205, one end of the capacitor C217 is connected with one end of the resistor R205, the other end of the resistor R206 is connected with a fifty-sixth pin of the main control module, the other end of the capacitor C215, the other end of the capacitor C216, the other end of the resistor R, The other end of the resistor R205 and the other end of the capacitor C217 are both grounded;
the main power supply unit comprises a bidirectional voltage stabilizing diode D201, a diode D202, sequentially numbered capacitors C201 to C212, an inductor L201, a resistor R202, a voltage stabilizing diode D209, a field effect transistor Q201 and a fuse F201, wherein one end of the bidirectional voltage stabilizing diode D201 is connected with the anode of the diode D202 and connected with a KL30 signal line of the electric automobile, one ends of the capacitors C201 to C203 are connected with the cathode of the diode D202, one end of the inductor L201 is connected with one end of the capacitor C203, one ends of the capacitors C204 to C206 are connected with the other end of the inductor L201, the cathode of the voltage stabilizing diode D209 is connected with the other end of the capacitor C206, the anode of the voltage stabilizing diode D209 is connected with the grid of the field effect transistor Q201, one end of the resistor R20 and one end of the capacitor C207 are connected with the cathode of the voltage stabilizing diode D209, and the other end of the capacitor C; one end of the resistor R202 is connected with the other end of the resistor R201, the other end of the resistor R202 is connected with the grid electrode of the field effect tube Q201, the drain electrode of the field effect tube Q201 is connected with the cathode of the voltage stabilizing diode D209, the fuse F201 is connected between the source electrode and the drain electrode of the field effect tube Q201 in parallel, one ends from the capacitor C208 to the capacitor C212 are connected with the source electrode of the field effect tube Q201, and the other ends from the bidirectional voltage stabilizing diode D201 and the capacitor C201 to the capacitor C212 are grounded; the collector of the transistor Q202 is connected with the other end of the resistor R20.
Preferably, the integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric automobile further comprises a voltage stabilizing module, the voltage stabilizing module comprises a capacitor C218, a chip U201, a resistor 207, sequentially numbered capacitors C222 to C226, a resistor R208, an inductor L202, a diode D205 and a chip U202, a first pin of the chip U201 is connected with a source electrode of the field-effect tube Q201, one end of the capacitor C218 is connected with a first pin of the chip U201, and the other end of the capacitor C218 is connected with a fifth pin of the chip U201 and is grounded; the third pin and the sixth pin of the chip U201 are grounded, and the fourth pin of the chip U201 is grounded through a resistor R207; one end of the inductor L202 and the cathode of the diode D205 are connected and connected with the second pin of the chip U201 in parallel, the capacitor C222 is connected in parallel with two ends of the resistor R208, one end of the resistor R208 is connected with the fourth pin of the chip U201, and the other end of the resistor R208 is connected with the other end of the inductor L202; one end of each of the capacitors C223 to C226 is connected to the other end of the inductor L202, and a third pin of the chip U202 is connected to the other end of the inductor L202; the anode of the diode D205, the other ends of the capacitors C223 to C226, and the first pin of the chip U202 are all grounded; the third pin of the chip U202 serves as a power supply VCC _5V port, and the second pin of the chip U202 is connected with the fourth pin of the chip U202 and serves as a power supply VCC _3V3 port.
Preferably, the model of the chip U201 is LM2596, and the model of the chip U202 is TLV 1117-33.
Preferably, the CAN module includes a chip U301, a capacitor C303, a capacitor C304, a resistor R301, a resistor R302, a resistor R303, a bidirectional zener diode D301, and a bidirectional zener diode D302, a third pin of the chip U301 is connected to the power supply VCC _5V, one end of the capacitor C301 is connected to the power supply VCC _5V, and the other end of the capacitor C301 is grounded; the second pin of the chip U301 is grounded, and the eighth pin of the chip U301 is grounded through a resistor R301; a seventh pin of the chip U301 is connected with one end of the capacitor C303, a sixth pin of the chip U301 is connected with one end of the capacitor C304, and the other end of the capacitor C303 and the other end of the capacitor C304 are grounded; one end of the resistor R302 is connected with the seventh pin of the chip U301, one end of the resistor R303 is connected with the sixth pin of the chip U301, and the other end of the resistor R302 is connected with the other end of the resistor R303; one end of the bidirectional voltage stabilizing diode D301 is connected with one end of the resistor R302, one end of the bidirectional voltage stabilizing diode D302 is connected with one end of the resistor R303, and the other end of the bidirectional voltage stabilizing diode D301 is connected with the other end of the bidirectional voltage stabilizing diode D302 and is grounded; one end of a bidirectional voltage stabilizing diode D301 is connected with a CANH lead of the CAN bus of the electric automobile, and one end of a bidirectional voltage stabilizing diode D302 is connected with a CANL lead of the CAN bus of the electric automobile; the first pin of the chip U301 is connected to the forty-fifth pin of the main control module, and the fourth pin of the chip U301 is connected to the forty-fourth pin of the main control module.
Preferably, the model of the chip U301 is TJA 1042.
Preferably, the model of the main control module is STM32F103CRT 6.
The invention also provides a method for the low-speed running prompt tone and tire pressure detection integrated device of the electric automobile, which comprises the following steps: the main control module receives command information from a CAN bus of the electric vehicle through a CAN module, and acquires a gear, a vehicle speed, an enabling signal and a sound source selection signal; the main control chip selects a corresponding output sound source to output a PWM signal to the storage module according to the gear, the vehicle speed, the enable signal and the sound source selection signal, the storage module processes the PWM signal generated by the main control module, the modulated PWM signal is converted into an analog signal, high-frequency components in the signal are eliminated, and a warning prompt sound is given out, the tire pressure detection module detects pressure data of each tire and sends the pressure data to the chip U2, the pressure data are transmitted to the main control module through the chip U2, and the display module connected with the main control module displays the pressure data of each tire.
The invention has the advantages that:
(1) the main control module receives the instruction information from the electric vehicle CAN bus through the CAN module, finally sends out the sound of warning prompt through the storage module, the tire pressure detection module detects the tire pressure data, the filter circuit and the continuous networking circuit filter noise, the low-noise amplifier enlarges the transmission distance, an external low-noise amplifier is avoided, the complexity and the cost of the system are reduced, the tire pressure detection module and the storage module enable the system to integrate the tire pressure detection function and the low-speed running prompt sound function through sharing the main control module and the CAN module, the use of devices is reduced, the research and development investment of an individual system is reduced, the research and development cost is reduced, less space in a vehicle is occupied, and the resource waste is reduced.
(2) The capacitor C26, the inductor L2, the filter L4, the capacitor C20, the capacitor C21 and the capacitor C22 form a filter circuit, unnecessary signals can be well filtered, the inductor L1, the capacitor C17, the capacitor C25, the capacitor C30, the capacitor C33, the capacitor C29, the inductor L3 and the capacitor C28 form a continuous networking circuit, low noise can be achieved, the filter effect can be improved, the resistor R15, the resistor R26, the resistor R13, the capacitor C19, the triode Q3 and the diode D2 form a low noise amplifier, the effective transmission distance of a system can be enlarged, or an external low noise amplifier is avoided, and therefore complexity and cost of the system are reduced.
(3) The storage module is externally connected with a loudspeaker, and a user can freely select the audio information stored in the storage module, so that a prompt tone selected by the user is sent out during low-speed running, and personalized application is realized.
Drawings
Fig. 1 is a block diagram of a low-speed driving warning sound and tire pressure detection integrated device of an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a main control module in an integrated device for detecting low-speed driving warning sounds and tire pressures of an electric vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a tire pressure detecting module in an integrated device for detecting low-speed driving warning sounds and tire pressures of an electric vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a memory module in an integrated device for detecting low-speed driving warning sounds and tire pressures of an electric vehicle according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a power module in an integrated device for detecting low-speed driving warning sounds and tire pressures of an electric vehicle according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a voltage stabilizing module in the integrated device for detecting low-speed driving warning sound and tire pressure of an electric vehicle according to the embodiment of the present invention;
fig. 7 is a schematic diagram of a CAN module in an integrated device for detecting low-speed driving prompt sound and tire pressure of an electric vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an electric automobile low-speed driving warning sound and tire pressure detection integrated device comprises a power module, a CAN module, a main control module, a storage module, a tire pressure detection module and a display module, wherein the main control module is respectively connected with the power module and the CAN module, the power module is connected with a power supply of the electric automobile through an external interface, the CAN module is connected with a CAN bus of the electric automobile through the external interface, and the storage module, the tire pressure detection module and the display module are all connected with the main control module.
As shown in fig. 2, the model of the main control module is STM32F103CRT 6. The chip has resources including: 48KBSRAM, 256KB FLASH, 2 basic timers, 4 universal timers, 2 advanced timers, 2 DMA controllers (12 channels in total), 3 SPI, 2 IIC, 5 serial ports, 1 USB, 1 CAN, 3 12-bit ADC, 1 12-bit DAC, 1 SDIO interface and 51 universal IO interfaces, and the chip has extremely high cost performance. The peripheral circuit of the main control module in fig. 2 is a conventional circuit, and the connection relationship thereof is not described herein again.
As shown in fig. 3, the tire pressure detecting module includes a chip U2, a resistor R13, a resistor R15, a resistor R16, sequentially numbered resistors R19 to R24, an inductor L1, an inductor L2, an inductor L3, a filter L4, a transistor Q3, a diode D2, a capacitor C2, and a capacitor C2, where the capacitor C2, the inductor L2, the filter L2, the capacitor C2 form a filter circuit, the inductor L2, the capacitor C2, the inductor L2, the capacitor C2, and the capacitor C2 form a continuous networking circuit, the resistor R2, the resistor R15, the resistor R16, the resistor R68672, the diode Q2, the low noise amplifier, the diode Q2, and the low noise amplifier are sequentially connected to the continuous networking circuit.
The chip U2 selects the chip TDA5235, which is a microwave radio frequency signal receiver, and the devices of the automobile grade also integrate an intermediate frequency filter (optional external filter) and a level shifter, only a few external components are needed, and the material cost is reduced. A twelfth pin of the chip U2 is connected with a twenty-fourth pin of the main control module through a resistor R21, a thirteenth pin of the chip U2 is connected with a seventeenth pin of the main control module through a resistor R23, a sixteenth pin of the chip U2 is connected with a twentieth pin of the main control module through a resistor R24, a seventeenth pin of the chip U2 is connected with a twenty-first pin of the main control module through a resistor R22, an eighteenth pin of the chip U2 is connected with a twenty-third pin of the main control module through a resistor R20, and a nineteenth pin of the chip U2 is connected with a twenty-second pin of the main control module through a resistor R19; one end of a capacitor C26 is connected to the twenty-second pin of the chip U2 and one end of an inductor L2, the other end of the inductor L2 is connected to the second pin of the filter L4 through a capacitor C22, the first pin, the third pin, the fourth pin and the sixth pin of the filter L4 are all grounded, the fifth pin of the filter L4 is sequentially connected to one end of a capacitor C21 through a capacitor C20 and a capacitor C21, one end of the capacitor C21 is connected to one end of the inductor L21, the other end of the capacitor C21 is connected to the emitter of the transistor Q21 and grounded, the other end of the inductor L21 is connected to one end of the capacitor C21, one end of the resistor R21 and one end of the resistor R21 are grounded, the other end of the resistor R21 is connected to the base of the transistor Q21 and the anode of the diode D21, the other end of the diode D21 is connected to the ground, the VCC R21 and one end of the capacitor C365 _ V21 and one end of the capacitor C21. The other end of the capacitor C19 is grounded; one end of a capacitor C28 is connected with the base electrode of the triode Q3, the other end of the capacitor C28 is connected with the tire pressure detection sensor through an inductor L3, a capacitor C29 and a capacitor C30, the tire pressure detection sensor is arranged in the tire, one end of a capacitor C33 is connected to a connecting line of the capacitor C29 and the capacitor C30, and the capacitor C33 is grounded.
As shown in FIG. 4, the memory module includes a chip U1, sequentially numbered resistors R1-R7, sequentially numbered capacitors C1-C12, an inductor FB1, an inductor FB2, and a resistor VR 1. Chip U1 selects TPA3111D1QPWPRQ1 chip, and it is a 10W high efficiency D class audio power amplifier for driving bridge connection type loudspeaker. It is specifically directed to vehicle noise generation for hybrid/electric vehicles (HEV/EV). One end of the resistor R4 is connected with the sixteenth pin of the main control module, the other end of the resistor R4 and one end of the resistor R3 are connected with the first pin of the chip U1, the first pin of the chip U1 is connected with the second pin of the chip U1, the third pin and the fourth pin of the chip U1 are connected and grounded, one end of the resistor R5 is connected with the twenty-seventh pin of the main control module, the other end of the resistor R5 is connected with the fifth pin of the chip U1, one end of the resistor R6 is connected with the twenty-sixth pin of the main control module, the other end of the resistor R6 is connected with the sixth pin of the chip U1, one end of the resistor R7 is connected with the power supply VCC12V, the other end of the resistor R7 is connected with the seventh pin of the chip U1 and one end of the capacitor C10, the other end of the capacitor C10 is grounded, one end of the capacitor C5 is connected with the eighth pin of the chip U1 and grounded, and the ninth pin of the; one end of the capacitor C6 is grounded, and the other end of the capacitor C6 is connected with the eleventh pin of the chip U1; one end of the capacitor C8 is connected with the twenty-fifth pin of the main control module, the other end of the capacitor C8 is connected with the twelfth pin of the chip U1, and the fourteenth pin of the chip U1 is connected with one end of the capacitor C10;
one end of a capacitor C11 is connected with a fifteenth pin of a chip U1 and a power supply VCC12V, one end of a capacitor C12 is connected with a sixteenth pin of a chip U1 and a power supply VCC12V, one end of a capacitor C9 is connected with an eighteenth pin and a twentieth pin of a chip U1, the other end of the capacitor C9 is connected with a seventeenth pin and a twenty-first pin of a chip U1, one end of an inductor FB2 is connected with one end of a capacitor C9, and the other end of the inductor FB2 is connected with one end of a capacitor C7 and the positive end of a horn; one end of a capacitor C3 is connected with the twenty-sixth pin and the twenty-second pin of the chip U1, the other end of a capacitor C3 is connected with the twenty-fifth pin and the twenty-third pin of the chip U1, one end of an inductor FB1 is connected with the other end of a capacitor C3, the other end of an inductor FB1 is connected with one end of a capacitor C4 and one end of a resistor VR1, and the other end of a resistor VR1 is connected with the negative end of a horn; one end of a capacitor C1, one end of a capacitor C2 and one end of a resistor R3 are all connected with a power supply VCC12V, a twenty-seventh pin and a twenty-eighth pin of a chip U1 are all connected with one end of a capacitor C1, and the other end of a resistor R3 is connected with the other end of a resistor R4; the other end of the capacitor C11, the other end of the capacitor C12, the other end of the capacitor C7, the other end of the capacitor C4, the other end of the capacitor C1, the other end of the capacitor C2, the nineteenth pin of the chip U1 and the twenty-fourth pin of the chip U1 are all grounded.
As shown in fig. 5, the power supply module includes a main power supply unit and a wake-up unit, the wake-up unit includes a capacitor C215, a resistor R203, a capacitor C216, a resistor R204, a transistor Q202, a transistor Q203, a resistor R205, a capacitor C217, and a resistor R206, one end of the capacitor C215 is connected with one end of the resistor R203 and is connected with a KL15 signal line of the electric automobile in parallel, the other end of the resistor R203 is connected with a base electrode of the triode Q202, one end of the capacitor C216 and one end of the resistor R204 are both connected with the other end of the resistor R203, a collector electrode of the triode Q202 is connected with a collector electrode of the triode Q203, the base electrode of the triode Q203 is connected with one end of the resistor R205, one end of the capacitor C217 is connected with one end of the resistor R205, one end of the resistor R206 is connected with one end of the capacitor C217, the other end of the capacitor C215, the other end of the capacitor C216, the other end of the resistor R204, an emitter electrode of the triode Q202, an emitter electrode.
Continuing to refer to fig. 5, the main power supply unit includes a bidirectional zener diode D201, a diode D202, sequentially numbered capacitors C201 to C212, an inductor L201, a resistor R202, a zener diode D209, a field effect transistor Q201, and a fuse F201, one end of the bidirectional zener diode D201 is connected to the anode of the diode D202 and connected to the KL30 signal line of the electric vehicle, one ends of the capacitors C201 to C203 are connected to the cathode of the diode D202, one end of the inductor L201 is connected to one end of the capacitor C203, one ends of the capacitors C204 to C206 are connected to the other end of the inductor L201, the cathode of the zener diode D209 is connected to the other end of the capacitor C206, the anode of the zener diode D209 is connected to the gate of the field effect transistor Q201, one end of the resistor R20 and one end of the capacitor C207 are connected to the cathode of the zener diode D209, and the other end of the capacitor C207 is connected; one end of the resistor R202 is connected with the other end of the resistor R201, the other end of the resistor R202 is connected with the grid electrode of the field effect tube Q201, the drain electrode of the field effect tube Q201 is connected with the cathode of the voltage stabilizing diode D209, the fuse F201 is connected between the source electrode and the drain electrode of the field effect tube Q201 in parallel, one ends from the capacitor C208 to the capacitor C212 are connected with the source electrode of the field effect tube Q201, and the other ends from the bidirectional voltage stabilizing diode D201 and the capacitor C201 to the capacitor C212 are grounded; the collector of the transistor Q202 is connected with the other end of the resistor R20. The main power supply unit is used as normal power to supply power to other circuit boards in the device in low power consumption, and the KL30 signal line of the electric automobile is connected, so that the device provided by the invention is powered on.
As shown in fig. 6, in this embodiment, a switching voltage regulator LM2596 having a wide voltage input, buck-type power management monolithic integrated circuit is selected and connected to supply power through a KL30 automotive power supply signal line. The LM2596 series is a 3A current output step-down switch type integrated voltage stabilizing chip produced by Texas Instruments (TI), which comprises a fixed frequency oscillator (150KHZ) and a reference voltage stabilizer (1.23V), has a wide voltage input characteristic of 40V and a low power consumption mode of 80uA, and has perfect protection circuits, current limitation, thermal shutoff circuits and the like. The device can form the high-efficiency voltage stabilizing circuit by only needing few peripheral devices. Provided are: 3V, 5V, 12V and adjustable (-ADJ), and has good linearity and load adjustment characteristics. Specifically, the integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric automobile further comprises a voltage stabilizing module, wherein the voltage stabilizing module comprises a capacitor C218, a chip U201, a resistor 207, sequentially numbered capacitors C222 to C226, a resistor R208, an inductor L202, a diode D205 and a chip U202, the model of the chip U201 is LM2596, and the model of the chip U202 is TLV 1117-33. The first pin of the chip U201 is connected with the source electrode of the field effect transistor Q201, one end of the capacitor C218 is connected with the first pin of the chip U201, and the other end of the capacitor C218 is connected with the fifth pin of the chip U201 and is grounded; the third pin and the sixth pin of the chip U201 are grounded, and the fourth pin of the chip U201 is grounded through a resistor R207; one end of the inductor L202 and the cathode of the diode D205 are connected and connected with the second pin of the chip U201 in parallel, the capacitor C222 is connected in parallel with two ends of the resistor R208, one end of the resistor R208 is connected with the fourth pin of the chip U201, and the other end of the resistor R208 is connected with the other end of the inductor L202; one end of each of the capacitors C223 to C226 is connected to the other end of the inductor L202, and a third pin of the chip U202 is connected to the other end of the inductor L202; the anode of the diode D205, the other ends of the capacitors C223 to C226, and the first pin of the chip U202 are all grounded; the third pin of the chip U202 serves as a power supply VCC _5V port, and the second pin of the chip U202 is connected with the fourth pin of the chip U202 and serves as a power supply VCC _3V3 port. The voltage stabilizing module has the advantages of high cost performance, strong function and stability, good linearity and load regulation characteristics, capability of supporting constant voltage output and adjustable output, enough flexibility and certain positive effect on system upgrading and modification.
As shown in fig. 7, the CAN module includes a chip U301, a capacitor C303, a capacitor C304, a resistor R301, a resistor R302, a resistor R303, a bidirectional zener diode D301, and a bidirectional zener diode D302, where the model of the chip U301 is TJA 1042. A third pin of the chip U301 is connected with a power supply VCC _5V, one end of the capacitor C301 is connected with the power supply VCC _5V, and the other end of the capacitor C301 is grounded; the second pin of the chip U301 is grounded, and the eighth pin of the chip U301 is grounded through a resistor R301; a seventh pin of the chip U301 is connected with one end of the capacitor C303, a sixth pin of the chip U301 is connected with one end of the capacitor C304, and the other end of the capacitor C303 and the other end of the capacitor C304 are grounded; one end of the resistor R302 is connected with the seventh pin of the chip U301, one end of the resistor R303 is connected with the sixth pin of the chip U301, and the other end of the resistor R302 is connected with the other end of the resistor R303; one end of the bidirectional voltage stabilizing diode D301 is connected with one end of the resistor R302, one end of the bidirectional voltage stabilizing diode D302 is connected with one end of the resistor R303, and the other end of the bidirectional voltage stabilizing diode D301 is connected with the other end of the bidirectional voltage stabilizing diode D302 and is grounded; one end of the bidirectional voltage-stabilizing diode D301 is connected with a CANH lead of the CAN bus of the electric automobile, and one end of the bidirectional voltage-stabilizing diode D302 is connected with a CANL lead of the CAN bus of the electric automobile. The CAN module belongs to a high-speed low-power-consumption CAN transceiver, is suitable for a 12V system, CAN be directly connected with a 3V-5V microcontroller interface, has the transmission rate of 1Mbit/s, is invisible on a bus when the transceiver is powered off or in a low-power-consumption mode, and CAN be awakened through the bus in a standby mode.
The invention also provides a method for the low-speed running prompt tone and tire pressure detection integrated device of the electric automobile, which comprises the following steps: the main control module receives command information from a CAN bus of the electric vehicle through a CAN module, and acquires a gear, a vehicle speed, an enabling signal and a sound source selection signal; the main control chip selects a corresponding output sound source to output a PWM signal to the storage module according to the gear, the vehicle speed, the enable signal and the sound source selection signal, the storage module processes the PWM signal generated by the main control module, the modulated PWM signal is converted into an analog signal, high-frequency components in the signal are eliminated, and a warning prompt sound is given out, the tire pressure detection module detects pressure data of each tire and sends the pressure data to the chip U2, the pressure data are transmitted to the main control module through the chip U2, and the display module connected with the main control module displays the pressure data of each tire.
Through the technical scheme, after the awakening unit of the power module in the electric vehicle low-speed running prompt tone and tire pressure detection integrated device is connected with a KL15 signal lead of the electric vehicle, a signal is sent to the main control module to awaken the electric vehicle low-speed running prompt tone and tire pressure detection integrated device, and the main control module receives instruction information from a CAN bus of the electric vehicle through the CAN module to obtain a gear, a vehicle speed, an enable signal and a sound source selection signal; the main control chip selects a corresponding output sound source to output a PWM signal according to the gear, the vehicle speed, the enable signal and the sound source selection signal, the storage module converts the modulated PWM signal into an analog signal, high-frequency components in the signal are eliminated, and a warning prompt sound is emitted, so that in the starting or low-speed driving process, pedestrians are prompted to pay attention, and traffic accidents are avoided. The tire pressure detection module detects tire pressure data, the filter circuit and the continuous networking circuit filter noise, the low-noise amplifier enlarges the transmission distance, an external low-noise amplifier is avoided, and the complexity and the cost of the system are reduced. Thereby tire pressure detection module and storage module make the system integrate tire pressure detection function and low-speed warning sound function of driving through sharing host system, CAN module, reduce the use of device, reduce the input of independent system research and development, reduce the research and development cost, occupy less interior space of car, reduce the wasting of resources.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The integrated device for detecting the low-speed running prompt tone and the tire pressure of the electric automobile is characterized by comprising a power supply module, a CAN module, a main control module, a storage module, a tire pressure detection module and a display module, wherein the main control module is respectively connected with the power supply module and the CAN module;
the tire pressure detection module comprises a chip U2, a resistor R13, a resistor R15, a resistor R16, sequentially numbered resistors R19 to R24, an inductor L1, an inductor L2, an inductor L3, a filter L4, a triode Q3, a diode D2, a capacitor C2 and a capacitor C2, wherein the capacitor C2, the inductor L2, the filter L2, the capacitor C2 and the capacitor C2 form a filter circuit, the inductor L2, the capacitor C2, a resistor L2 and a low-noise amplifier, and the low-noise amplifier are sequentially connected with the chip U2 and the filter.
2. The integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric vehicle as claimed in claim 1, wherein the twelfth pin of the chip U2 is connected to the twenty-fourth pin of the main control module through a resistor R21, the thirteenth pin of the chip U2 is connected to the seventeenth pin of the main control module through a resistor R23, the sixteenth pin of the chip U2 is connected to the twentieth pin of the main control module through a resistor R24, the seventeenth pin of the chip U2 is connected to the twenty-first pin of the main control module through a resistor R22, the eighteenth pin of the chip U2 is connected to the twenty-third pin of the main control module through a resistor R20, and the nineteenth pin of the chip U2 is connected to the twenty-second pin of the main control module through a resistor R19; one end of a capacitor C26 is connected to the twenty-second pin of the chip U2 and one end of an inductor L2, the other end of the inductor L2 is connected to the second pin of the filter L4 through a capacitor C22, the first pin, the third pin, the fourth pin and the sixth pin of the filter L4 are all grounded, the fifth pin of the filter L4 is sequentially connected to one end of a capacitor C21 through a capacitor C20 and a capacitor C21, one end of the capacitor C21 is connected to one end of the inductor L21, the other end of the capacitor C21 is connected to the emitter of the transistor Q21 and grounded, the other end of the inductor L21 is connected to one end of the capacitor C21, one end of the resistor R21 and one end of the resistor R21 are grounded, the other end of the resistor R21 is connected to the base of the transistor Q21 and the anode of the diode D21, the other end of the diode D21 is connected to the ground, the VCC R21 and one end of the capacitor C365 _ V21 and one end of the capacitor C21. The other end of the capacitor C19 is grounded; one end of a capacitor C28 is connected with the base electrode of the triode Q3, the other end of the capacitor C28 is connected with the tire pressure detection sensor through an inductor L3, a capacitor C29 and a capacitor C30, the tire pressure detection sensor is arranged in the tire, one end of a capacitor C33 is connected to a connecting line of the capacitor C29 and the capacitor C30, and the capacitor C33 is grounded.
3. The integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric vehicle as claimed in claim 1, wherein the memory module comprises a chip U1, a sequentially numbered resistor R1 to resistor R7, a sequentially numbered capacitor C1 to capacitor C12, an inductor FB1, an inductor FB2 and a resistor VR1, one end of the resistor R4 is connected with the sixteenth pin of the main control module, the other end of the resistor R4 and one end of the resistor R3 are connected with the first pin of the chip U1, the first pin of the chip U1 is connected with the second pin of the chip U1, the third pin and the fourth pin of the chip U1 are connected and grounded, one end of the resistor R5 is connected with the seventeenth pin of the main control module, the other end of the resistor R5 is connected with the fifth pin of the chip U1, one end of the resistor R6 is connected with the twenty-sixth pin of the main control module, the other end of the resistor R1 is connected with the sixth pin of the resistor U6342, and one end of the resistor R68612 is connected with the power supply, the other end of the resistor R7 is connected with the seventh pin of the chip U1 and one end of the capacitor C10, the other end of the capacitor C10 is grounded, one end of the capacitor C5 is connected with the eighth pin of the chip U1 and is grounded, and the other end of the capacitor C5 is connected with the ninth pin of the chip U1 and the tenth pin of the chip U1; one end of the capacitor C6 is grounded, and the other end of the capacitor C6 is connected with the eleventh pin of the chip U1; one end of the capacitor C8 is connected with the twenty-fifth pin of the main control module, the other end of the capacitor C8 is connected with the twelfth pin of the chip U1, and the fourteenth pin of the chip U1 is connected with one end of the capacitor C10;
one end of a capacitor C11 is connected with a fifteenth pin of a chip U1 and a power supply VCC12V, one end of a capacitor C12 is connected with a sixteenth pin of a chip U1 and a power supply VCC12V, one end of a capacitor C9 is connected with an eighteenth pin and a twentieth pin of a chip U1, the other end of the capacitor C9 is connected with a seventeenth pin and a twenty-first pin of a chip U1, one end of an inductor FB2 is connected with one end of a capacitor C9, and the other end of the inductor FB2 is connected with one end of a capacitor C7 and the positive end of a horn; one end of a capacitor C3 is connected with the twenty-sixth pin and the twenty-second pin of the chip U1, the other end of a capacitor C3 is connected with the twenty-fifth pin and the twenty-third pin of the chip U1, one end of an inductor FB1 is connected with the other end of a capacitor C3, the other end of an inductor FB1 is connected with one end of a capacitor C4 and one end of a resistor VR1, and the other end of a resistor VR1 is connected with the negative end of a horn; one end of a capacitor C1, one end of a capacitor C2 and one end of a resistor R3 are all connected with a power supply VCC12V, a twenty-seventh pin and a twenty-eighth pin of a chip U1 are all connected with one end of a capacitor C1, and the other end of a resistor R3 is connected with the other end of a resistor R4; the other end of the capacitor C11, the other end of the capacitor C12, the other end of the capacitor C7, the other end of the capacitor C4, the other end of the capacitor C1, the other end of the capacitor C2, the nineteenth pin of the chip U1 and the twenty-fourth pin of the chip U1 are all grounded.
4. The integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric vehicle according to claim 1, wherein the power module comprises a main power supply unit and a wake-up unit, the wake-up unit comprises a capacitor C215, a resistor R203, a capacitor C216, a resistor R204, a transistor Q202, a transistor Q203, a resistor R205, a capacitor C217 and a resistor R206, one end of the capacitor C215 is connected with one end of the resistor R203 and connected with a KL15 signal line of the electric vehicle, the other end of the resistor R203 is connected with a base of the transistor Q202, one end of the capacitor C216 and one end of the resistor R204 are connected with the other end of the resistor R203, a collector of the transistor Q202 is connected with a collector of the transistor Q203, the base of the transistor Q203 is connected with one end of the resistor R205, one end of the capacitor C217 is connected with one end of the resistor R206, the other end of the resistor R206 is connected with a sixth pin of the main control module, the other end of the capacitor C215, the other end of the capacitor C216, the other end of the resistor R204, the emitter of the transistor Q202, the emitter of the transistor Q203, the other end of the resistor R205 and the other end of the capacitor C217 are all grounded;
the main power supply unit comprises a bidirectional voltage stabilizing diode D201, a diode D202, sequentially numbered capacitors C201 to C212, an inductor L201, a resistor R202, a voltage stabilizing diode D209, a field effect transistor Q201 and a fuse F201, wherein one end of the bidirectional voltage stabilizing diode D201 is connected with the anode of the diode D202 and connected with a KL30 signal line of the electric automobile, one ends of the capacitors C201 to C203 are connected with the cathode of the diode D202, one end of the inductor L201 is connected with one end of the capacitor C203, one ends of the capacitors C204 to C206 are connected with the other end of the inductor L201, the cathode of the voltage stabilizing diode D209 is connected with the other end of the capacitor C206, the anode of the voltage stabilizing diode D209 is connected with the grid of the field effect transistor Q201, one end of the resistor R20 and one end of the capacitor C207 are connected with the cathode of the voltage stabilizing diode D209, and the other end of the capacitor C; one end of the resistor R202 is connected with the other end of the resistor R201, the other end of the resistor R202 is connected with the grid electrode of the field effect tube Q201, the drain electrode of the field effect tube Q201 is connected with the cathode of the voltage stabilizing diode D209, the fuse F201 is connected between the source electrode and the drain electrode of the field effect tube Q201 in parallel, one ends from the capacitor C208 to the capacitor C212 are connected with the source electrode of the field effect tube Q201, and the other ends from the bidirectional voltage stabilizing diode D201 and the capacitor C201 to the capacitor C212 are grounded; the collector of the transistor Q202 is connected with the other end of the resistor R20.
5. The integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric automobile according to claim 4, further comprising a voltage stabilizing module, wherein the voltage stabilizing module comprises a capacitor C218, a chip U201, a resistor 207, sequentially numbered capacitors C222 to C226, a resistor R208, an inductor L202, a diode D205 and a chip U202, a first pin of the chip U201 is connected with a source electrode of the field effect transistor Q201, one end of the capacitor C218 is connected with a first pin of the chip U201, and the other end of the capacitor C218 is connected with a fifth pin of the chip U201 and is grounded; the third pin and the sixth pin of the chip U201 are grounded, and the fourth pin of the chip U201 is grounded through a resistor R207; one end of the inductor L202 and the cathode of the diode D205 are connected and connected with the second pin of the chip U201 in parallel, the capacitor C222 is connected in parallel with two ends of the resistor R208, one end of the resistor R208 is connected with the fourth pin of the chip U201, and the other end of the resistor R208 is connected with the other end of the inductor L202; one end of each of the capacitors C223 to C226 is connected to the other end of the inductor L202, and a third pin of the chip U202 is connected to the other end of the inductor L202; the anode of the diode D205, the other ends of the capacitors C223 to C226, and the first pin of the chip U202 are all grounded; the third pin of the chip U202 serves as a power supply VCC _5V port, and the second pin of the chip U202 is connected with the fourth pin of the chip U202 and serves as a power supply VCC _3V3 port.
6. The integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric vehicle as claimed in claim 5, wherein the model of the chip U201 is LM2596, and the model of the chip U202 is TLV 1117-33.
7. The integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric vehicle as claimed in claim 1, wherein the CAN module comprises a chip U301, a capacitor C303, a capacitor C304, a resistor R301, a resistor R302, a resistor R303, a bidirectional zener diode D301 and a bidirectional zener diode D302, a third pin of the chip U301 is connected to a power supply VCC _5V, one end of the capacitor C301 is connected to the power supply VCC _5V, and the other end of the capacitor C301 is connected to ground; the second pin of the chip U301 is grounded, and the eighth pin of the chip U301 is grounded through a resistor R301; a seventh pin of the chip U301 is connected with one end of the capacitor C303, a sixth pin of the chip U301 is connected with one end of the capacitor C304, and the other end of the capacitor C303 and the other end of the capacitor C304 are grounded; one end of the resistor R302 is connected with the seventh pin of the chip U301, one end of the resistor R303 is connected with the sixth pin of the chip U301, and the other end of the resistor R302 is connected with the other end of the resistor R303; one end of the bidirectional voltage stabilizing diode D301 is connected with one end of the resistor R302, one end of the bidirectional voltage stabilizing diode D302 is connected with one end of the resistor R303, and the other end of the bidirectional voltage stabilizing diode D301 is connected with the other end of the bidirectional voltage stabilizing diode D302 and is grounded; one end of a bidirectional voltage stabilizing diode D301 is connected with a CANH lead of the CAN bus of the electric automobile, and one end of a bidirectional voltage stabilizing diode D302 is connected with a CANL lead of the CAN bus of the electric automobile; the first pin of the chip U301 is connected to the forty-fifth pin of the main control module, and the fourth pin of the chip U301 is connected to the forty-fourth pin of the main control module.
8. The integrated device for low-speed driving prompt tone and tire pressure detection of electric vehicles according to claim 7, wherein the model of the chip U301 is TJA 1042.
9. The integrated device for detecting the low-speed driving prompt tone and the tire pressure of the electric automobile according to claim 1, wherein the model of the main control module is STM32F103CRT 6.
10. The method for integrating the low-speed running prompting sound and the tire pressure detection of the electric vehicle as claimed in any one of claims 1 to 9, wherein the method comprises the following steps: the main control module receives command information from a CAN bus of the electric vehicle through a CAN module, and acquires a gear, a vehicle speed, an enabling signal and a sound source selection signal; the main control chip selects a corresponding output sound source to output a PWM signal to the storage module according to the gear, the vehicle speed, the enable signal and the sound source selection signal, the storage module processes the PWM signal generated by the main control module, the modulated PWM signal is converted into an analog signal, high-frequency components in the signal are eliminated, and a warning prompt sound is given out, the tire pressure detection module detects pressure data of each tire and sends the pressure data to the chip U2, the pressure data are transmitted to the main control module through the chip U2, and the display module connected with the main control module displays the pressure data of each tire.
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|---|---|
| CN (1) | CN111546839A (en) |
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