CN112498020A - Vehicle-mounted intelligent terminal integrating tire pressure monitoring - Google Patents
Vehicle-mounted intelligent terminal integrating tire pressure monitoring Download PDFInfo
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- CN112498020A CN112498020A CN202011428068.1A CN202011428068A CN112498020A CN 112498020 A CN112498020 A CN 112498020A CN 202011428068 A CN202011428068 A CN 202011428068A CN 112498020 A CN112498020 A CN 112498020A
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Classifications
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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
- B60C23/0474—Measurement control, e.g. setting measurement rate or calibrating of sensors; Further processing of measured values, e.g. filtering, compensating or slope monitoring
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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
- B60C23/0486—Signalling devices actuated by tyre pressure mounted on the wheel or tyre comprising additional sensors in the wheel or tyre mounted monitoring device, e.g. movement sensors, microphones or earth magnetic field sensors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
本发明公开了一种集成胎压监测的车载智能终端，包括：第一CAN收发器、MCU、APU、胎压监测模块、GPS模块和第二CAN收发器；所述第一CAN收发器、MCU、APU和胎压监测模块依次连接；所述GPS模块，用于获取GPS天线的射频信号；所述第二CAN收发器，用于接收车辆CAN网络信号中的包括车速、轮速、发动机转速在内的差分信号后转化为电平信号；所述胎压监测模块，用于根据GPS模块的射频信号和第二CAN收发器的电平信号，进行GPS数据解析和胎压监测运算。本发明将胎压监测模块集成到车载智能终端中，利用GPS信号作为辅助，修正非胎压因素引起轮速脉冲变化对胎压算法的影响，降低系统误报率。
The invention discloses a vehicle-mounted intelligent terminal integrating tire pressure monitoring, comprising: a first CAN transceiver, an MCU, an APU, a tire pressure monitoring module, a GPS module and a second CAN transceiver; the first CAN transceiver, the MCU , APU and the tire pressure monitoring module are connected in turn; the GPS module is used to obtain the radio frequency signal of the GPS antenna; the second CAN transceiver is used to receive the vehicle speed, wheel speed, and engine speed in the vehicle CAN network signal. The differential signal inside is converted into a level signal; the tire pressure monitoring module is used to perform GPS data analysis and tire pressure monitoring calculation according to the radio frequency signal of the GPS module and the level signal of the second CAN transceiver. The invention integrates the tire pressure monitoring module into the vehicle-mounted intelligent terminal, uses the GPS signal as an auxiliary, corrects the influence of the wheel speed pulse change caused by the non-tire pressure factor on the tire pressure algorithm, and reduces the false alarm rate of the system.
Description
Technical Field
The invention relates to the intelligent automobile technology, in particular to a vehicle-mounted intelligent terminal integrated with tire pressure monitoring.
Background
The tire pressure monitoring system is abbreviated as "TPMS", which is an abbreviation of "tire pressure monitoring system". The technology can automatically monitor various conditions of the tire in real time by recording the rotating speed of the tire or the tire pressure sensor arranged in the tire, and can provide effective safety guarantee for driving. Tire pressure monitoring systems can be divided into two categories: one is an indirect tire pressure monitoring system, which judges whether the tire is abnormal or not through the rotation speed difference of the tire; the other type is a direct type tire pressure monitoring system, four tire pressure monitoring sensors are additionally arranged in a tire, so that the pressure and the temperature of the tire are automatically monitored in real time in the static or driving process of the automobile, and the high pressure, the low pressure and the high temperature of the tire are alarmed in time.
Indirect tire pressure is actually a software algorithm that is integrated into the ESC system on existing vehicles. The ESC integrated tire pressure monitoring system collects data such as vehicle speed, wheel speed and engine speed on the whole vehicle, calculates and compares the data and determines whether the tire pressure is abnormal or not. ESC integrated form tire pressure monitoring module gathers data such as the speed of a motor vehicle, the wheel speed, engine speed on whole car and calculates the comparison and then confirms whether tire pressure has unusually, nevertheless under special road conditions such as bend, jolt the condition, the distance that one side wheel went is longer than the opposite side wheel, leads to both sides wheel rotational speed to be different, can lead to the tire pressure monitoring to appear the wrong report.
Disclosure of Invention
The invention aims to solve the technical problem of providing a vehicle-mounted intelligent terminal integrated with tire pressure monitoring aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: an integrated tire pressure monitoring's on-vehicle intelligent terminal includes:
the system comprises a first CAN transceiver, an MCU, an APU, a tire pressure monitoring module, a GPS module and a second CAN transceiver;
the first CAN transceiver, the MCU, the APU and the tire pressure monitoring module are connected in sequence;
the GPS module is used for acquiring a radio frequency signal of a GPS antenna;
the second CAN transceiver is used for receiving differential signals including the speed, the wheel speed and the engine speed in the CAN network signals of the vehicle and then converting the differential signals into level signals;
the tire pressure monitoring module is used for carrying out GPS data analysis and tire pressure monitoring operation according to the radio frequency signal of the GPS module and the level signal of the second CAN transceiver;
the GPS data analysis comprises the steps of analyzing the absolute speed of the running of the vehicle, the running angle of the vehicle and the height difference change of the vehicle through the radio frequency signal of the GPS module;
the tire pressure monitoring operation is that tire pressure monitoring misinformation is revised for carrying out according to GPS data analysis, and includes:
analyzing the absolute speed of the vehicle according to the GPS data, and correcting the wheel speed error caused by slipping, acceleration, deceleration and braking factors in the vehicle running process;
wheel speed errors caused by turning and bumping factors in the driving process of the vehicle are corrected by analyzing the driving angle of the vehicle according to GPS data;
the wheel speed error caused by the factors that the tire is driven to slip and the rotating speed is increased due to the uphill and downhill in the running process of the vehicle is corrected by analyzing the height difference change of the vehicle according to the GPS data;
namely, if the change rate of the absolute speed of the vehicle running exceeds a set threshold value, judging that the wheel speed error at the moment is caused by skidding, acceleration and deceleration or braking in the running process of the vehicle, and not giving an alarm;
if the steering angle of the vehicle is larger than a set value and the wheel speed error is smaller than the wheel speed error calibrated by the distance error corresponding to the steering angle, judging the wheel speed error caused by the turning factor, and not alarming;
if the stable and continuous height difference is analyzed from the GPS of the vehicle and the wheel speed error is smaller than the calibration error value corresponding to the real-time wheel drop value, the wheel speed error caused by the slope factors is judged, and no alarm is given.
According to the scheme, the tire pressure monitoring module is in communication interaction with the APU through the serial port and sends the GPS data analysis and tire pressure monitoring operation result to the APU.
The serial port is two lines connecting the UART TX and the UART RX, and has a baud rate 115200.
The invention has the following beneficial effects:
according to the invention, the tire pressure monitoring module is integrated into the vehicle-mounted intelligent terminal, and the influence of wheel speed pulse change caused by non-tire pressure factors on a tire pressure algorithm is corrected by using a GPS signal as assistance, so that the false alarm rate of the system is reduced.
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The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to solve the disadvantages of the ESC integrated tire pressure monitoring module, the scheme is that the tire pressure monitoring module is integrated into a vehicle-mounted intelligent terminal, the tire pressure monitoring module utilizes a GPS signal of the vehicle-mounted intelligent terminal as assistance, and can acquire the position and the driving track of a vehicle through GPS data, thereby correcting or eliminating the influence of wheel speed pulse change caused by non-tire pressure factors such as turning, ascending and descending and the like on a tire pressure algorithm, for example, the absolute speed of the vehicle is measured through GPS so as to correct the wheel speed error caused by factors such as skidding, acceleration, deceleration, braking and the like in the driving process of the vehicle, the wheel speed error caused by factors such as turning, jolt and the like in the driving process of the vehicle is corrected through the angle of the vehicle measured through GPS, the wheel speed error caused by factors such as the skidding and the rotating speed increase of the driving tire on the ascending and descending slope in the driving process, meanwhile, the online upgrade of the tire pressure monitoring module can be realized by utilizing the network of the vehicle-mounted intelligent terminal.
As shown in fig. 1, an in-vehicle intelligent terminal integrated with tire pressure monitoring includes:
the system comprises a first CAN transceiver, an MCU, an APU, a tire pressure monitoring module, a GPS module and a second CAN transceiver;
the first CAN transceiver, the MCU, the APU and the tire pressure monitoring module are connected in sequence;
the GPS module is used for acquiring a radio frequency signal of a GPS antenna;
the second CAN transceiver is used for receiving differential signals including the speed, the wheel speed and the engine speed in the CAN network signals of the vehicle and then converting the differential signals into level signals;
the tire pressure monitoring module is used for carrying out GPS data analysis and tire pressure monitoring operation according to the radio frequency signal of the GPS module and the level signal of the second CAN transceiver;
the GPS data analysis comprises the steps of analyzing the absolute speed of the running of the vehicle, the running angle of the vehicle and the height difference change of the vehicle through the radio frequency signal of the GPS module;
the tire pressure monitoring operation is that tire pressure monitoring misinformation is revised for carrying out according to GPS data analysis, and includes:
correcting wheel speed errors caused by slipping, acceleration, deceleration and braking factors in the driving process of the vehicle according to the absolute driving speed of the vehicle;
the wheel speed error caused by turning and bumping factors in the driving process of the vehicle is corrected through the driving angle of the vehicle;
the wheel speed error caused by the factor that the tire slips and the rotating speed is increased due to the driving of an uphill and a downhill in the running process of the vehicle is corrected through the height difference change of the vehicle.
Because on-vehicle intelligent terminal is the equipment of taking operating system, compares with ESC system, and the transmission link of data is longer, and the data that receive from whole car just CAN be sent to tire pressure monitoring module after CAN transceiver, MCU, APU multilayer conversion, and vehicle CAN data transmission link is: in order to solve the problem, the CAN transceiver in the vehicle-mounted intelligent terminal is additionally provided with the CAN transceiver and is used for converting differential signals of data such as vehicle speed, wheel speed, engine speed and the like in a vehicle CAN network signal into level signals and transmitting the level signals to the MCU, the MCU is further transmitted to the APU, the APU is transmitted to the tire pressure monitoring module through a serial port, the whole transmission link is too long and has time delay, the APU cannot meet the cycle requirement of 10ms due to too large load, the real-time requirement of tire pressure monitoring calculation cannot be ensured, and the CAN transceiver is used for converting the differential signals of the data such as the vehicle speed, the wheel speed and the engine speed in the vehicle CAN network into the high-low level signals and then directly transmitting the high-low level signals to the tire pressure monitoring module in real.
The tire pressure monitoring module is in communication interaction with the APU through a serial port, a calculated result is transmitted to the APU through the serial port, and the result is displayed on an interface after being processed by the APU. The serial port is two lines connecting the UART TX and the UART RX, and has a baud rate 115200.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (2)
1. The utility model provides an on-vehicle intelligent terminal of integrated tire pressure monitoring which characterized in that includes:
the system comprises a first CAN transceiver, an MCU, an APU, a tire pressure monitoring module, a GPS module and a second CAN transceiver;
the first CAN transceiver, the MCU, the APU and the tire pressure monitoring module are connected in sequence;
the GPS module is used for acquiring a radio frequency signal of a GPS antenna;
the second CAN transceiver is used for receiving differential signals including the speed, the wheel speed and the engine speed in the CAN network signals of the vehicle and then converting the differential signals into level signals;
the tire pressure monitoring module is used for carrying out GPS data analysis and tire pressure monitoring operation according to the radio frequency signal of the GPS module and the level signal of the second CAN transceiver;
the GPS data analysis comprises the steps of analyzing the absolute speed of the running of the vehicle, the running angle of the vehicle and the height difference change of the vehicle through the radio frequency signal of the GPS module;
the tire pressure monitoring operation is to analyze and correct the false alarm of tire pressure monitoring according to GPS data, and specifically comprises the following steps:
if the change rate of the absolute speed of the running vehicle analyzed by the GPS data exceeds a set threshold value, judging that the wheel speed error at the moment is caused by skidding, acceleration and deceleration or braking in the running process of the vehicle, and not giving an alarm;
if the steering angle of the vehicle running analyzed by the GPS data is larger than a set value and the wheel speed error is smaller than the wheel speed error calibrated by the distance error corresponding to the steering angle, judging the wheel speed error caused by the turning factor, and not alarming;
if the stable and continuous height difference is analyzed from the GPS of the vehicle and the wheel speed error is smaller than the calibration error value corresponding to the real-time wheel drop value, the wheel speed error caused by the slope factors is judged, and no alarm is given.
2. The vehicle-mounted intelligent terminal for integrated tire pressure monitoring according to claim 1, wherein the tire pressure monitoring module performs communication interaction with the APU through a serial port, and transmits the GPS data analysis and the tire pressure monitoring operation result to the APU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011428068.1A CN112498020A (en) | 2020-12-07 | 2020-12-07 | Vehicle-mounted intelligent terminal integrating tire pressure monitoring |
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| CN202011428068.1A CN112498020A (en) | 2020-12-07 | 2020-12-07 | Vehicle-mounted intelligent terminal integrating tire pressure monitoring |
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Cited By (2)
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| CN114734762A (en) * | 2022-04-20 | 2022-07-12 | 岚图汽车科技有限公司 | Tire pressure monitoring method, controller, system and electronic equipment |
| CN116890582A (en) * | 2023-09-11 | 2023-10-17 | 深圳富士伟业科技有限公司 | Tire pressure sensor upgrading verification method based on tire pressure detection |
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| CN116890582A (en) * | 2023-09-11 | 2023-10-17 | 深圳富士伟业科技有限公司 | Tire pressure sensor upgrading verification method based on tire pressure detection |
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Application publication date: 20210316 |