CN114115203A - Analog torque sensor based on NE555 design for EPS - Google Patents
Analog torque sensor based on NE555 design for EPS Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0243—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults model based detection method, e.g. first-principles knowledge model
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
- G01L5/221—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to steering wheels, e.g. for power assisted steering
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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Abstract
The invention discloses an NE555 design-based analog torque sensor for EPS; the circuit comprises two circuit systems, wherein each circuit system comprises NE555 chips, second pins of the NE555 chips are respectively and electrically connected with a diode D2 and a diode D4, one end of the diode D2 is electrically connected with a resistor R2, one end of the diode D4 is electrically connected with a resistor R6, one end of the resistor R2 is electrically connected with an RV1A potentiometer, one end of the resistor R6 is electrically connected with an RV1B potentiometer, one end of the RV1A potentiometer is electrically connected with a resistor R1, and one end of the RV1B potentiometer is electrically connected with a resistor R5; the invention can output square waves with adjustable duty ratio by adjusting the potentiometer, simulates signals of the torque sensor, and enables the EPS to enter a power-assisted working state, thereby avoiding a fussy process and a dismounting process for frequently changing the program of the EPS controller in the testing process, and protecting the structural quality of the EPS controller and the service life of the hardware of the EPS controller.
Description
Technical Field
The invention belongs to the technical field of torque sensors for EPS, and particularly relates to an NE555 design-based analog torque sensor for EPS.
Background
In the EPS (electric power steering) controller test process, such as a service life test, a temperature test, a vibration test, an EMC test and the like, the EPS controller is required to drive the motor to rotate so as to judge whether the EPS controller works normally. In the prior art, tests CAN be carried out by changing an EPS controller program into an autorotation program, the method needs to burn the EPS controller again, and the EPS controller without the CAN communication function needs to disassemble a controller cooling fin for program burning, so that the method is time-consuming and labor-consuming, and irreversible damage CAN be caused to the sealing property of the controller by repeatedly disassembling the controller.
In the traditional torque sensor integrated and EPS assembly mechanical structure, the volume is large and the carrying is difficult. In the brushless EPS product test, whether the EPS product works normally can be judged by using hand force applied to an input shaft or a special test bench, which wastes time and labor. When the PWM waveform of an EPS controller driving motor is collected, the existing situation is to connect a test bench, an operator rotates a steering wheel by one hand and detects an EPS controller test point by using an oscilloscope probe by the other hand, and the operation is inconvenient.
Disclosure of Invention
The invention aims to provide an analog torque sensor based on NE555 design for EPS, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an analog torque sensor designed based on NE555 for EPS comprises two circuit systems, wherein each of the two circuit systems comprises an NE555 chip, a third pin of each of the two NE555 chips outputs square waves with variable duty ratios, second pins of the two NE555 chips are respectively and electrically connected with a diode D2 and a diode D4, one end of a diode D2 is electrically connected with a resistor R2, one end of the diode D4 is electrically connected with a resistor R6, one end of a resistor R2 is electrically connected with an RV1A potentiometer, one end of the resistor R6 is electrically connected with an RV1B potentiometer, one end of the RV1A potentiometer is electrically connected with a resistor R1, and one end of the RV1B potentiometer is electrically connected with a resistor R5;
seventh pins of the two NE555 chips are electrically connected with the RV1A potentiometer and the RV1B potentiometer respectively, sixth pins of the two NE555 chips are electrically connected with a diode D1 and a diode D3 respectively, one end of the diode D1 is electrically connected with the seventh pin of one of the NE555 chips, and one end of the diode D3 is electrically connected with the seventh pin of the other NE555 chip;
the sixth pins and the second pins of the two NE555 chips are electrically connected, and the connection points between the sixth pins and the second pins of the two NE555 chips are respectively and electrically connected with a capacitor C1 and a capacitor C3.
Preferably, the third pins of the two NE555 chips are electrically connected to a resistor R3 and a resistor R7, respectively, one end of the resistor R3 is provided with a first connection end T1, and one end of the resistor R7 is provided with a second connection end T2.
Preferably, the two circuit systems include a torque sensor interface J1, the torque sensor interface J1 is provided with four pins, the four pins of the torque sensor interface J1 are an input pin, a T1 pin, a T2 pin and a ground pin, and the T1 pin and the T2 pin are electrically connected to the first connection terminal T1 and the second connection terminal T2 of the two circuit systems, respectively.
Preferably, one end of the resistor R3 is electrically connected to a resistor R4, one end of the resistor R7 is electrically connected to a resistor R8, and one ends of the resistor R4 and the resistor R8 are both electrically grounded.
Preferably, the eighth pin and the fourth pin of the two NE555 chips are respectively electrically connected to a power input terminal, one end of the resistor R1 and one end of the resistor R5 are also respectively electrically connected to the power input terminal, and the power input terminal is connected to a voltage of 5V.
Preferably, the capacitors C2 and C4 are electrically connected to the fifth pins of the two NE555 chips, respectively, and one ends of the capacitors C2 and C4 are electrically connected to the ground terminal, respectively.
Preferably, one end of the capacitor C1 and one end of the capacitor C3 are electrically connected to a ground terminal, respectively, and the first pins of the two NE555 chips are also electrically connected to the ground terminal, respectively.
Preferably, the second pin of one of the NE555 chips cannot be changed to a high level immediately when powered on, the second pin in an initial state is a low level, the NE555 chip is set, the third pin outputs a high level VDD, at this time, the capacitor C1 is charged through the resistor R1, the RA terminal of the RV1A potentiometer and the diode D1 circuit, when the capacitor C1 is charged to a threshold voltage 2/3VDD,
charging time thereof
,
The second pin is in high level, the NE555 chip is reset, the third pin outputs low level, at the moment, the capacitor C1 enters a seventh pin through the diode D2, the resistor R2 and the RB end of the RV1A potentiometer to discharge in the NE555 chip,
discharge time thereof
,
When the discharging is finished, the second pin is in a low level, the NE555 chip is set, so as to circularly form square waves,
having a period of time of
，
The duty ratio of the square wave output by the third pin is
，
Wherein
，
Frequency of
。
Preferably, when the RV1A potentiometer is a resistance midpoint, the third pin of the NE555 chip outputs a square wave with a duty cycle of 50%, the analog torque sensor is at the midpoint and does not rotate the steering wheel, the resistor R1 and the resistor R2 are protection resistors, limit the duty cycle range of the output square wave and limit the controller to drive the motor not to rotate at the highest speed,
maximum value of duty ratio at this time
，
When the temperature of the water is higher than the set temperature,
minimum duty cycle
，
When the temperature of the water is higher than the set temperature,
the fifth pin is a control voltage end, when the voltage-dividing resistor is not used, the fifth pin is connected with a capacitor to be grounded so as to prevent signal interference, and the resistor R3 and the resistor R4 are divider resistors.
Preferably, the RV1A potentiometer and the RV1B potentiometer are two parts of a single-control duplex potentiometer.
Compared with the prior art, the invention has the beneficial effects that:
the invention designs a simulation torque sensor circuit for EPS, which can simulate a torque sensor signal, provides convenience in the test process of an EPS controller, can simulate the deformation of a torsion bar under the condition of not changing the program of the EPS controller and the condition of not manually rotating a steering wheel, and enables the EPS controller to enter a power-assisted working state, and has the advantages that: the EPS controller has the advantages of being small in size, light in weight, portable, low in cost, simple in structure, safe, capable of changing parameter values according to user demands, avoiding complex processes and dismounting processes of frequently changing EPS controller programs in a testing process, protecting the structure quality of the EPS controller and the service life of EPS controller hardware, protecting the service life of a motor in the using process, and providing convenience for testing the EPS product quality.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1, the present invention provides a technical solution: an analog torque sensor designed based on NE555 for EPS comprises two circuit systems, wherein each of the two circuit systems comprises an NE555 chip, a third pin of each of the two NE555 chips outputs square waves with variable duty ratios, second pins of the two NE555 chips are respectively and electrically connected with a diode D2 and a diode D4, one end of a diode D2 is electrically connected with a resistor R2, one end of the diode D4 is electrically connected with a resistor R6, one end of a resistor R2 is electrically connected with an RV1A potentiometer, one end of the resistor R6 is electrically connected with an RV1B potentiometer, one end of the RV1A potentiometer is electrically connected with a resistor R1, and one end of the RV1B potentiometer is electrically connected with a resistor R5;
seventh pins of the two NE555 chips are electrically connected with the RV1A potentiometer and the RV1B potentiometer respectively, sixth pins of the two NE555 chips are electrically connected with a diode D1 and a diode D3 respectively, one end of the diode D1 is electrically connected with the seventh pin of one of the NE555 chips, and one end of the diode D3 is electrically connected with the seventh pin of the other NE555 chip;
the sixth pins and the second pins of the two NE555 chips are electrically connected, and the connection points between the sixth pins and the second pins of the two NE555 chips are respectively and electrically connected with a capacitor C1 and a capacitor C3.
In order to realize the output of square waves and realize voltage division regulation and circuit safety protection, the resistor R3 and the resistor R4 are combined to realize the voltage division function; the resistor R7 and the resistor R8 are combined to realize a voltage division function; in this embodiment, preferably, the third pins of the two NE555 chips are electrically connected to a resistor R3 and a resistor R7, respectively, one end of the resistor R3 is provided with a first connection end T1, one end of the resistor R7 is provided with a second connection end T2, one end of the resistor R3 is electrically connected to a resistor R4, one end of the resistor R7 is electrically connected to a resistor R8, and one ends of the resistor R4 and the resistor R8 are both electrically grounded.
In order to enable the adjustment potentiometer to be electrically connected and control and adjust two circuit systems, in this embodiment, it is preferable that the two circuit systems include a torque sensor interface J1, the torque sensor interface J1 is provided with four pins, the four pins of the torque sensor interface J1 are an input pin, a T1 pin, a T2 pin and a ground pin, and the T1 pin and the T2 pin are electrically connected to the first connection terminal T1 and the second connection terminal T2 of the two circuit systems, respectively.
In order to implement the input and supply of power to the two circuit systems, in this embodiment, preferably, the eighth pin and the fourth pin of the two NE555 chips are respectively and electrically connected to a power input terminal, one end of the resistor R1 and one end of the resistor R5 are also respectively and electrically connected to the power input terminal, and the power input terminal is connected to a voltage of 5V.
In order to realize charging and discharging of the system and safety protection, in this embodiment, preferably, the capacitors C2 and C4 are electrically connected to the fifth pins of the two NE555 chips, respectively, and one ends of the capacitors C2 and C4 are electrically connected to a ground terminal, respectively.
In order to implement the safety protection of the circuit system, in this embodiment, preferably, one end of the capacitor C1 and one end of the capacitor C3 are electrically connected to a ground terminal, and the first pins of the two NE555 chips are also electrically connected to the ground terminal.
In order to implement the square wave output and calculation, in this embodiment, preferably, the second pin of one of the NE555 chips cannot immediately change to a high level when powered on, the second pin is at a low level in an initial state, so that the NE555 chip is set, the third pin outputs a high level VDD, at this time, the capacitor C1 is charged through the resistor R1, the RA terminal of the RV1A potentiometer and the diode D1 circuit, when the capacitor C1 is charged to a threshold voltage 2/3VDD,
charging time thereof
,
The second pin is in high level, the NE555 chip is reset, the third pin outputs low level, at the moment, the capacitor C1 enters a seventh pin through the diode D2, the resistor R2 and the RB end of the RV1A potentiometer to discharge in the NE555 chip,
discharge time thereof
,
When the discharging is finished, the second pin is in a low level, the NE555 chip is set, so as to circularly form square waves,
having a period of time of
，
The duty ratio of the square wave output by the third pin is
，
Wherein
，
Frequency of
。
Preferably, when the RV1A potentiometer is a resistance midpoint, the third pin of the NE555 chip outputs a square wave with a duty cycle of 50%, the analog torque sensor is at the midpoint and does not rotate the steering wheel, the resistor R1 and the resistor R2 are protection resistors, limit the duty cycle range of the output square wave and limit the controller to drive the motor not to rotate at the highest speed,
maximum value of duty ratio at this time
，
When the temperature of the water is higher than the set temperature,
minimum duty cycle
，
When the temperature of the water is higher than the set temperature,
the fifth pin is a control voltage end, when the voltage-dividing resistor is not used, the fifth pin is connected with a capacitor to be grounded so as to prevent signal interference, and the resistor R3 and the resistor R4 are divider resistors.
In order to realize single-control dual-link control adjustment, in this embodiment, preferably, the RV1A potentiometer and the RV1B potentiometer are two components of a single-control dual-link potentiometer, and the principle thereof is to embed two potentiometers with the same resistance value, synchronously adjust the two potentiometers through the same knob, reversely connect the RV1B potentiometer, when adjusting the potentiometer knob, the voltage dividing resistors of the RV1A potentiometer and the RV1B potentiometer change in opposite trend, so that when the first connection end T1 outputs square wave duty ratio to increase, the first connection end T2 outputs square wave duty ratio to decrease,
thereby ensuring that the duty ratio of the first connection end T1 and the first connection end T2 is
。
The working principle and the using process of the invention are as follows: the third pins of the two NE555 chips output square waves with variable duty ratios, the two circuits have the same principle, only the upper circuit is explained, and the lower circuit has the same principle;
the second pin of one of the NE555 chips cannot be changed into high level immediately when being electrified, the second pin in an initial state is low level, the NE555 chip is enabled to be set, the third pin outputs high level VDD, and at the moment, the capacitor C1 passes through the resistor R1 and the RA of the RV1A potentiometerThe diode D1 circuit is charged, and when the capacitor C1 is charged to the threshold voltage 2/3VDD, the charging time is long
When the second pin is at high level, the NE555 chip is reset, the third pin outputs low level, at the moment, the capacitor C1 enters a seventh pin through the diode D2, the resistor R2 and the RB end of the RV1A potentiometer to discharge in the NE555 chip, and the discharge time is short
When the discharging is finished, the second pin is at a low level, the NE555 chip is set, square waves are formed in a circulating mode, and the period duration of the square waves is equal to
The duty ratio of the square wave output by the third pin is
Wherein
Frequency of
. When the RV1A potentiometer is a resistance midpoint, the duty ratio output by the third pin of the NE555 chip is a 50% square wave, the analog torque sensor is at the midpoint and does not rotate the steering wheel, the resistor R1 and the resistor R2 are protection resistors, the duty ratio range of the output square wave is limited, the controller is limited, the driving motor cannot rotate at the highest speed, and the maximum duty ratio is limited
，
Time of duty cycle minimum
，
And when the voltage divider is not used, the fifth pin is a control voltage end, the capacitor is connected to the ground to prevent signal interference, and the resistor R3 and the resistor R4 are voltage dividing resistors. The RV1A potentiometer and the RV1B potentiometer are two parts of a single-control dual potentiometer, the principle is that two potentiometers with the same resistance are arranged in the potentiometer, the two potentiometers are synchronously adjusted through the same knob, the RV1B potentiometer is reversely connected, when the knob of the potentiometer is adjusted, the RV1A potentiometer and the voltage dividing resistor of the RV1B potentiometer change in opposite trend, when the duty ratio of square waves output by the first connecting end T1 is increased, the duty ratio of square waves output by the first connecting end T2 is decreased, and therefore the duty ratios of the first connecting end T1 and the first connecting end T2 can be ensured to be the same
。
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An analog torque sensor based on NE555 design for EPS, includes two circuitry, its characterized in that: the two circuit systems respectively comprise NE555 chips, third pins of the two NE555 chips output square waves with variable duty ratios, second pins of the two NE555 chips are respectively and electrically connected with a diode D2 and a diode D4, one end of a diode D2 is electrically connected with a resistor R2, one end of the diode D4 is electrically connected with a resistor R6, one end of a resistor R2 is electrically connected with an RV1A potentiometer, one end of the resistor R6 is electrically connected with an RV1B potentiometer, one end of the RV1A potentiometer is electrically connected with a resistor R1, and one end of the RV1B potentiometer is electrically connected with a resistor R5;
seventh pins of the two NE555 chips are electrically connected with the RV1A potentiometer and the RV1B potentiometer respectively, sixth pins of the two NE555 chips are electrically connected with a diode D1 and a diode D3 respectively, one end of the diode D1 is electrically connected with the seventh pin of one of the NE555 chips, and one end of the diode D3 is electrically connected with the seventh pin of the other NE555 chip;
the sixth pins and the second pins of the two NE555 chips are electrically connected, and the connection points between the sixth pins and the second pins of the two NE555 chips are respectively and electrically connected with a capacitor C1 and a capacitor C3.
2. The analog torque sensor based on the NE555 design for EPS of claim 1, wherein: the third pins of the two NE555 chips are respectively and electrically connected with a resistor R3 and a resistor R7, one end of the resistor R3 is provided with a first connection end T1, and one end of the resistor R7 is provided with a second connection end T2.
3. The analog torque sensor based on the NE555 design for EPS according to claim 2, wherein: the two circuit systems comprise a torque sensor interface J1, the torque sensor interface J1 is provided with four pins, the four pins of the torque sensor interface J1 are respectively an input pin, a T1 pin, a T2 pin and a grounding pin, and the T1 pin and the T2 pin are respectively and electrically connected with the first connecting end T1 and the second connecting end T2 in the two circuit systems.
4. The analog torque sensor based on the NE555 design for EPS according to claim 2, wherein: one end of the resistor R3 is electrically connected with a resistor R4, one end of the resistor R7 is electrically connected with a resistor R8, and one ends of the resistor R4 and the resistor R8 are both electrically grounded.
5. The analog torque sensor based on the NE555 design for EPS of claim 1, wherein: the eighth pin and the fourth pin of the two NE555 chips are respectively and electrically connected with a power input end, one end of the resistor R1 and one end of the resistor R5 are also respectively and electrically connected with the power input end, and the power input end is connected with 5V voltage.
6. The analog torque sensor based on the NE555 design for EPS of claim 1, wherein: and the fifth pins of the two NE555 chips are respectively and electrically connected with a capacitor C2 and a capacitor C4, and one ends of the capacitor C2 and the capacitor C4 are respectively and electrically connected with a ground terminal.
7. The analog torque sensor based on the NE555 design for EPS of claim 1, wherein: one end of the capacitor C1 and one end of the capacitor C3 are electrically connected to a ground terminal respectively, and the first pins of the two NE555 chips are also electrically connected to the ground terminal respectively.
8. The analog torque sensor based on the NE555 design for EPS of claim 1, wherein: the second pin of one of the NE555 chips cannot be changed into high level immediately when being powered on, the second pin in an initial state is low level, the NE555 chip is set, the third pin outputs high level VDD, at this time, the capacitor C1 is charged through the resistor R1, the RA terminal of the RV1A potentiometer and the diode D1 circuit, when the capacitor C1 is charged to threshold voltage 2/3VDD,
charging time thereof
,
The second pin is in high level, the NE555 chip is reset, the third pin outputs low level, at the moment, the capacitor C1 enters a seventh pin through the diode D2, the resistor R2 and the RB end of the RV1A potentiometer to discharge in the NE555 chip,
discharge time thereof
,
When the discharging is finished, the second pin is in a low level, the NE555 chip is set, so as to circularly form square waves,
having a period of time of
，
The duty ratio of the square wave output by the third pin is
，
Wherein
，
Frequency of
。
9. The analog torque sensor based on the NE555 design for EPS of claim 1, wherein: when the RV1A potentiometer is a resistance midpoint, the duty ratio output by the third pin of the NE555 chip is 50% square wave, at the moment, the analog torque sensor is in the midpoint and does not rotate the steering wheel, the resistor R1 and the resistor R2 are protection resistors, the duty ratio range of the output square wave is limited, the controller is limited to drive the motor not to rotate at the highest speed,
maximum value of duty ratio at this time
，
When the temperature of the water is higher than the set temperature,
minimum duty cycle
，
When the temperature of the water is higher than the set temperature,
the fifth pin is a control voltage end, when the voltage-dividing resistor is not used, the fifth pin is connected with a capacitor to be grounded so as to prevent signal interference, and the resistor R3 and the resistor R4 are divider resistors.
10. The analog torque sensor based on the NE555 design for EPS according to claim 2, wherein: the RV1A potentiometer and the RV1B potentiometer are two parts of a single-control duplex potentiometer.
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