Device for measuring vehicle wheel cylinder pressure

Abstract

The utility model discloses a device for measuring the pressure of a wheel cylinder of a vehicle. The micro-control chip unit is respectively connected with the power management module and the peripheral interface module, the power management module is connected with the peripheral interface module, and the sensor isolation driving module and the peripheral interface module are electrically connected with oil pressure sensors of four wheels; the wheel cylinder pressure measuring device, the vehicle-mounted battery and the oil pressure monitoring equipment are arranged on the frame, the wheel cylinder pressure measuring device is connected with the four oil pressure sensors through wires, the oil pressure sensors are respectively arranged on wheel brake cylinders of wheels, the vehicle-mounted battery is electrically connected with the wheel cylinder pressure measuring device, and the wheel cylinder pressure measuring device is connected with the oil pressure monitoring equipment. According to the utility model, the hydraulic pressure of the four wheel cylinders of the vehicle is acquired in real time through the oil pressure sensor, processed by the MCU and sent to the monitoring equipment through the CAN bus, important data is provided for calibration of braking parameters of the passenger vehicle, the time for calibrating the vehicle is reduced, and the measuring device has the advantages of low cost, simplicity in maintenance and the like.

Description

Technical Field

[0001] The utility model relates to the field of passenger vehicle parameter calibration, in particular to a device for measuring vehicle wheel cylinder pressure. Background Art

[0002] The anti-lock braking system ABS uses the sensor installed on the wheel to send a signal that the wheel is about to lock. The controller instructs the regulator to reduce the oil pressure of the wheel brake cylinder to reduce the braking torque. After a certain period of time, the original oil pressure is restored, and this cycle is repeated continuously, so that the wheel remains in a rotating state while maintaining the maximum braking torque. Therefore, the oil pressure of the wheel cylinder is one of the important parameters that reflect the adjustment of the anti-lock braking system ABS.

[0003] In order to make the vehicle's ABS adjustment meet the corresponding regulatory requirements, vehicle calibration usually installs a purchased special wheel cylinder pressure detection device on the wheel cylinder. This device has the following two main problems:

[0004] 1. Special pressure monitoring equipment is expensive, and when multiple vehicles need to be calibrated at the same time, the cost of purchasing it is high.

[0005] 2. The maintenance cost of special pressure monitoring equipment is high and the maintenance cycle is long. Utility Model Content

[0006] In order to solve the problems existing in the background technology, the utility model provides a device for measuring the wheel cylinder pressure of a vehicle.

[0007] The technical solution of the utility model is achieved in this way:

[0008] The utility model comprises four parts, namely a microcontroller chip unit, a power management module, a sensor isolation drive module and a peripheral interface module; the microcontroller chip unit is respectively connected to the power management module and the peripheral interface module, the power management module is connected to the peripheral interface module, and the sensor isolation drive module and the peripheral interface module are respectively electrically connected to the oil pressure sensors of the four wheels.

[0009] The microcontrol chip unit includes a crystal oscillator module Y1 and a microcontroller chip MCU1. The pins and pins of the crystal oscillator module Y1 are grounded via capacitors C5 and C7 respectively. The pins and pins of the crystal oscillator module Y1 are grounded. The pins and pins of the crystal oscillator module Y1 are connected to the EXTAL pin and XTAL pin of the microcontroller chip MCU1 respectively. The VDD1 pin, VDDX pin, VRH pin, VDDA pin, VSSPLL pin, and VDDR pin of the microcontroller chip MCU1 are connected to the power supply VCC. The VSS1 pin, VSSX pin, VREGEN pin, VSSA pin, VRL pin, VSSPLL pin, XFC pin, and VSSR pin of the microcontroller chip MCU1 are connected to the ground.

[0010] The power management module includes a power management chip U4, the VSUP1 pin and the VSUP2 pin of the power management chip U4 are both connected to the IGN pin of the socket U2 in the peripheral interface module, and the CAN pin is grounded via a capacitor C8; the CANH pin is connected to the CANH pin of the socket U2 in the peripheral interface module, the CANL pin is connected to the CANL pin of the socket U2 in the peripheral interface module, the GND-CAN pin, the DBG pin, and the GND pin are all connected to the ground, the VDD pin outputs the power supply voltage VCC, and the RST pin is connected to the power supply voltage VCC via a resistor R1; the CS pin, the SCLK pin, the MOSI pin, the MISO pin, the TXD pin, and the RXD pin are respectively connected to the CS pin, the SCLK pin, the MOSI pin, the MISO pin, the TXD pin, and the RXD pin of the microcontroller chip MCU1 in the microcontroller chip unit.

[0011] The sensor isolation drive module includes sensor drive chips IC1 to IC4; the EN pin of the sensor drive chip IC1 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded via the capacitor C1, and the VO pin is connected to the VO1 pin of the oil pressure sensor P1 of the first wheel; the EN pin of the sensor drive chip IC2 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded via the capacitor C2, and the VO pin is connected to the The VO2 pin of the oil pressure sensor P2 of the second wheel; the EN pin of the sensor driver chip IC3 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded through the capacitor C2, and the VO pin is connected to the VO3 pin of the oil pressure sensor P3 of the third wheel; the EN pin of the sensor driver chip IC4 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded through the capacitor C2, and the VO pin is connected to the VO4 pin of the oil pressure sensor P4 of the fourth wheel.

[0012] The peripheral interface module includes a socket U2, an IGN pin of the socket U2 is connected to an external input power supply IGN, a GND pin, a GND1 pin, a GND2 pin, a GND3 pin and a GND4 pin are grounded, a VS1 pin is simultaneously connected to a signal output pin VS1 of an oil pressure sensor P1 of a first wheel and a module conversion port PAD07 in a microcontroller chip MCU1 in the microcontroller chip unit; a VS2 pin is simultaneously connected to a signal output pin VS2 of an oil pressure sensor P2 of a second wheel and a module conversion port PAD06 in a microcontroller chip MCU1 in the microcontroller chip unit; a VS3 pin is simultaneously connected to a signal output pin VS3 of an oil pressure sensor P3 of a third wheel and a module conversion port PAD05 in a microcontroller chip MCU1 in the microcontroller chip unit; and a VS4 pin is simultaneously connected to a signal output pin VS4 of an oil pressure sensor P4 of a fourth wheel and a module conversion port PAD04 in a microcontroller chip MCU1 in the microcontroller chip unit.

[0013] The oil pressure sensors P1, P2, P3, and P4 are respectively arranged on the wheel cylinders of the four wheels of the vehicle, and are connected to the peripheral interface module through a wiring harness. The vehicle-mounted ignition wire and the ground wire are respectively connected to the peripheral interface module to power the device.

[0014] The wheel cylinder pressure measuring device, the vehicle-mounted battery and the oil pressure monitoring equipment are installed together on the vehicle frame. The wheel cylinder pressure measuring device is connected to four oil pressure sensors via wires. Each oil pressure sensor is respectively installed on the wheel brake wheel cylinder of a wheel of the vehicle. The IGN ignition power supply line of the vehicle-mounted battery is electrically connected to the wheel cylinder pressure measuring device, and the CAN line on the wheel cylinder pressure measuring device is connected to the oil pressure monitoring equipment.

[0015] Beneficial effects of the utility model:

[0016] The utility model collects the hydraulic pressure of the four wheel cylinders of the vehicle in real time through the oil pressure sensor, processes it through the microcontroller MCU, and sends it to the monitoring equipment through the CAN bus, providing important data for the calibration of the brake parameters of the passenger car, reducing the time of vehicle calibration, and the measuring device has the advantages of low cost and simple maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The circuit schematic diagram of the utility model device;

[0018] Figure 2 This is a schematic diagram of the installation of the utility model device.

[0019] In the figure: microcontroller chip unit 1, power management module 2, sensor isolation drive module 3, peripheral interface module 4, wheel brake cylinder 5, oil pressure sensor 6, oil pressure monitoring equipment 7, wheel cylinder pressure measuring device 8, vehicle frame 9, vehicle battery 10. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, the device includes four parts, namely a microcontroller chip unit 1, a power management module 2, a sensor isolation drive module 3 and a peripheral interface module 4; the microcontroller chip unit 1 is connected to the power management module 2 and the peripheral interface module 4 respectively, the power management module 2 is connected to the peripheral interface module 4, and the sensor isolation drive module 3 and the peripheral interface module 4 are electrically connected to the oil pressure sensors 6 of the four wheels respectively.

[0022] like Figure 2As shown, the microcontroller chip unit 1 includes a crystal oscillator module Y1 and a microcontroller chip MCU1. Pin No. 1 and pin No. 3 of the crystal oscillator module Y1 are grounded via capacitors C5 and C7 respectively, and pin No. 2 and pin No. 4 of the crystal oscillator module Y1 are grounded. Pin No. 1 and pin No. 3 of the crystal oscillator module Y1 are connected to pin No. 34 EXTAL and pin No. 35 XTAL of the microcontroller chip MCU1 respectively; pin No. 9 VDD1, pin No. 77 VDDX, pin No. 60 VRH, pin No. 59 VDDA, pin No. 31 VSSPLL, and pin No. 29 VDDR of the microcontroller chip MCU1 are connected to the power supply VCC, and pin No. 10 VSS1, pin No. 76 VSSX, pin No. 67 VREGEN, pin No. 62 VSSA, pin No. 61 VRL, pin No. 33 VSSPLL, pin No. 32 XFC, and pin No. 28 VSSR of the microcontroller chip MCU1 are connected to ground.

[0023] like Figure 2 As shown, the power management module 2 includes a power management chip U4, and the No. 1 VSUP1 pin and the No. 2 VSUP2 pin of the power management chip U4 are both connected to the No. 1 IGN pin of the socket U2 in the peripheral interface module 4, and the No. 6 5V-CAN pin is grounded via a capacitor C8; the No. 7 CANH pin is connected to the No. 16 CANH pin of the socket U2 in the peripheral interface module 4, the No. 8 CANL pin is connected to the No. 15 CANL pin of the socket U2 in the peripheral interface module 4, the No. 9 GND-CAN pin, the No. 16 DBG pin, and the No. 38 GND pin are all connected to ground, the No. 28 VDD pin outputs the power supply voltage VCC, and the No. 22 RST pin is connected to the power supply voltage VCC via a resistor R1.

[0024] CS pin No. 24, SCLK pin No. 25, MOSI pin No. 26, MISO pin No. 27, TXD pin No. 29, and RXD pin No. 30 are respectively connected to CS pin No. 69, SCLK pin No. 70, MOSI pin No. 71, MISO pin No. 73, TXD pin No. 74, and RXD pin No. 75 of the microcontroller chip MCU1 in the microcontroller chip unit 1.

[0025] Specifically, RXD pin No. 30 is connected to RXD pin No. 75 of the micro-control chip MCU1 in the micro-control chip unit 1, TXD pin No. 29 is connected to TXD pin No. 74 of the micro-control chip MCU1 in the micro-control chip unit 1, MISO pin No. 27 is connected to MISO pin No. 73 of the micro-control chip MCU1 in the micro-control chip unit 1, MOSI pin No. 26 is connected to MOSI pin No. 71 of the micro-control chip MCU1 in the micro-control chip unit 1, SCLK pin No. 25 is connected to SCLK pin No. 70 of the micro-control chip MCU1 in the micro-control chip unit 1, and CS pin No. 24 is connected to CS pin No. 69 of the micro-control chip MCU1 in the micro-control chip unit 1.

[0026] like Figure 2 As shown, the sensor isolation driving module 3 includes sensor driving chips IC1 to IC4;

[0027] The No. 1 EN pin of the sensor driver chip IC1 is connected to the power supply voltage VCC, the No. 2 GND1 pin and the No. 5 GND2 pin are both grounded, the No. 3 VI pin is connected to the external input power supply IGN, the No. 4 VO pin is grounded via the capacitor C1, and the No. 4 VO pin is connected to the No. 1 VO1 pin of the oil pressure sensor P1 of the first wheel;

[0028] The No. 1 EN pin of the sensor driver chip IC2 is connected to the power supply voltage VCC, the No. 2 GND1 pin and the No. 5 GND2 pin are both grounded, the No. 3 VI pin is connected to the external input power supply IGN, the No. 4 VO pin is grounded via the capacitor C2, and the No. 4 VO pin is connected to the No. 1 VO2 pin of the oil pressure sensor P2 of the second wheel;

[0029] The No. 1 EN pin of the sensor driver chip IC3 is connected to the power supply voltage VCC, the No. 2 GND1 pin and the No. 5 GND2 pin are both grounded, the No. 3 VI pin is connected to the external input power supply IGN, the No. 4 VO pin is grounded via the capacitor C2, and the No. 4 VO pin is connected to the No. 1 VO3 pin of the oil pressure sensor P3 of the third wheel;

[0030] EN pin No. 1 of the sensor driver chip IC4 is connected to the power supply voltage VCC, GND1 pin No. 2 and GND2 pin No. 5 are both grounded, VI pin No. 3 is connected to the external input power supply IGN, VO pin No. 4 is grounded via capacitor C2, and VO pin No. 4 is connected to VO4 pin No. 1 of the oil pressure sensor P4 of the fourth wheel.

[0031] The oil pressure sensors P1 , P2 , P3 , and P4 are four oil pressure sensors 6 .

[0032] like Figure 2 As shown, the peripheral interface module 4 includes a socket U2,

[0033] The No. 1 IGN pin of the socket U2 is connected to the external input power IGN, the No. 2 GND pin, the No. 5 GND1 pin, the No. 8 GND2 pin, the No. 11 GND3 pin and the No. 14 GND4 pin are grounded, the No. 4 VS1 pin is simultaneously connected to the No. 2 signal output pin VS1 of the oil pressure sensor P1 of the first wheel and the No. 58 module conversion port PAD07 in the microcontroller chip MCU1 in the microcontroller chip unit 1; the No. 7 VS2 pin is simultaneously connected to the No. 2 signal output pin V S2, module conversion port No. 57 PAD06 in the microcontroller chip MCU1 in the microcontroller chip unit 1; VS3 pin No. 10 is simultaneously connected to signal output pin No. 2 VS3 of the oil pressure sensor P3 of the third wheel and module conversion port No. 57 PAD05 in the microcontroller chip MCU1 in the microcontroller chip unit 1; VS4 pin No. 13 is simultaneously connected to signal output pin No. 2 VS4 of the oil pressure sensor P4 of the fourth wheel and module conversion port No. 57 PAD04 in the microcontroller chip MCU1 in the microcontroller chip unit 1.

[0034] In the specific implementation, the model of MCU1 is S9S12P128JOMQK, the model of the power management chip U4 is MCZ33904A5EK, the model of the sensor driver chips IC1, IC2, IC3, and IC4 is TLE4250-2G, and the model of the oil pressure sensors P1, P2, P3, and P4 is 5PP11-2A.

[0035] The oil pressure sensors P1, P2, P3, and P4 are respectively arranged on the wheel cylinders of the four wheels of the vehicle, and are connected to the peripheral interface module 4 through a wiring harness. The vehicle ignition wire and the ground wire are respectively connected to the peripheral interface module 4 to power the device. The oil pressure monitoring device 7 interacts with the device through the CAN line on the peripheral interface module 4.

[0036] A wheel cylinder pressure measuring device 8, a vehicle-mounted battery 10 and an oil pressure monitoring device 7 are installed together on a vehicle frame 9. The wheel cylinder pressure measuring device 8 is connected to four oil pressure sensors 6 via wires. Each oil pressure sensor 6 is respectively installed on a wheel brake cylinder 5 of a wheel of the vehicle. The IGN ignition power supply line of the vehicle-mounted battery 10 is electrically connected to the wheel cylinder pressure measuring device 8. The CAN line on the wheel cylinder pressure measuring device 8 is connected to the oil pressure monitoring device 7.

[0037] Function of power management chip U4:

[0038] 1. Step down the IGN voltage +12V to VCC (+5V). VCC powers MCU1. At the same time, VCC powers pin 1 of sensor driver chip IC1, IC2, IC3, and IC4, providing a reference follower voltage value for the output of pin 4 VO of the driver chip.

[0039] 2. U4 has an internal integrated CAN interface. 5V-CAN is the power supply port of the internal CAN module, which interacts with MCU1 through the receive data line RXD and the transmit data line TXD.

[0040] 3. U4's parameter configuration and fault diagnosis information interact with MCU1 through SPI communication, which includes four data lines: MISO, MOSI, SCLK, and CS.

[0041] Functions of sensor driver chips IC1, IC2, IC3, and IC4:

[0042] 1. The voltage output VO of each chip is +5V. The four driver chips supply power to the four oil pressure sensors respectively, thereby isolating the power supply of each module and preventing the failure of a single sensor from causing the power supply failure of all sensors.

[0043] 2. Four driver chips supply power to four oil pressure sensors respectively, which improves the driving current capability and reduces the driving current demand for the system power supply VCC.

[0044] The use process of the utility model is as follows:

[0045] Step 1: If Figure 1 As shown, four oil pressure sensors 6 are respectively installed on the four wheel brake cylinders 5 of the vehicle, and connected to the wheel cylinder pressure measuring device 8 through wires. The wheel cylinder pressure measuring device 8 is fixed on the vehicle frame 9. The IGN ignition power supply line of the vehicle battery 10 is electrically connected to the wheel cylinder pressure measuring device 8, and the CAN line on the wheel cylinder pressure measuring device 8 is connected to the oil pressure monitoring device 7.

[0046] Step 2: The vehicle is ignited, and the IGN ignition power supply line of the vehicle battery 10 supplies power to the wheel cylinder pressure measuring device 8. During the vehicle ABS calibration, the calibration personnel can view the changes in the four-wheel oil pressure in real time through the oil pressure monitoring device 7 during the vehicle performance adjustment, and quickly and accurately match the vehicle parameters.

Claims

1. A device for measuring the wheel cylinder pressure of a vehicle, characterized in that: The invention comprises four parts, namely a microcontroller chip unit (1), a power management module (2), a sensor isolation drive module (3) and a peripheral interface module (4); the microcontroller chip unit (1) is connected to the power management module (2) and the peripheral interface module (4) respectively, the power management module (2) is connected to the peripheral interface module (4), and the sensor isolation drive module (3) and the peripheral interface module (4) are electrically connected to the oil pressure sensors (6) of the four wheels respectively.

2. The device for measuring the wheel cylinder pressure of a vehicle according to claim 1, characterized in that: The microcontroller chip unit (1) comprises a crystal oscillator module Y1 and a microcontroller chip MCU1. The pins and pins of the crystal oscillator module Y1 are grounded via capacitors C5 and C7 respectively. The pins and pins of the crystal oscillator module Y1 are grounded. The pins and pins of the crystal oscillator module Y1 are connected to the EXTAL pin and XTAL pin of the microcontroller chip MCU1 respectively. The VDD1 pin, VDDX pin, VRH pin, VDDA pin, VSSPLL pin and VDDR pin of the microcontroller chip MCU1 are connected to the power supply VCC. The VSS1 pin, VSSX pin, VREGEN pin, VSSA pin, VRL pin, VSSPLL pin, XFC pin and VSSR pin of the microcontroller chip MCU1 are connected to the ground.

3. The device for measuring the wheel cylinder pressure of a vehicle according to claim 1, characterized in that: The power management module (2) comprises a power management chip U4, wherein the VSUP1 pin and the VSUP2 pin of the power management chip U4 are both connected to the IGN pin of the socket U2 in the peripheral interface module (4), and the CAN pin is grounded via a capacitor C8; the CANH pin is connected to the CANH pin of the socket U2 in the peripheral interface module (4), the CANL pin is connected to the CANL pin of the socket U2 in the peripheral interface module (4), the GND-CAN pin, the DBG pin, and the GND pin are all connected to the ground, the VDD pin outputs a power supply voltage VCC, and the RST pin is connected to the power supply voltage VCC via a resistor R1; the CS pin, the SCLK pin, the MOSI pin, the MISO pin, the TXD pin, and the RXD pin are respectively connected to the CS pin, the SCLK pin, the MOSI pin, the MISO pin, the TXD pin, and the RXD pin of the microcontroller chip MCU1 in the microcontroller chip unit (1).

4. The device for measuring the wheel cylinder pressure of a vehicle according to claim 1, characterized in that: The sensor isolation drive module (3) comprises sensor drive chips IC1 to IC4; the EN pin of the sensor drive chip IC1 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded via a capacitor C1, and the VO pin is connected to the VO1 pin of the oil pressure sensor P1 of the first wheel; the EN pin of the sensor drive chip IC2 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded via a capacitor C2, and the VO pin is connected to The VO2 pin of the oil pressure sensor P2 of the second wheel; the EN pin of the sensor driver chip IC3 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded via the capacitor C2, and the VO pin is connected to the VO3 pin of the oil pressure sensor P3 of the third wheel; the EN pin of the sensor driver chip IC4 is connected to the power supply voltage VCC, the GND1 pin and the GND2 pin are both grounded, the VI pin is connected to the external input power supply IGN, the VO pin is grounded via the capacitor C2, and the VO pin is connected to the VO4 pin of the oil pressure sensor P4 of the fourth wheel.

5. The device for measuring the wheel cylinder pressure of a vehicle according to claim 1, characterized in that: The peripheral interface module (4) comprises a socket U2, an IGN pin of the socket U2 is connected to an external input power supply IGN, a GND pin, a GND1 pin, a GND2 pin, a GND3 pin and a GND4 pin are grounded, a VS1 pin is simultaneously connected to a signal output pin VS1 of an oil pressure sensor P1 of a first wheel and a module conversion port PAD07 in a microcontroller chip MCU1 in the microcontroller chip unit (1); a VS2 pin is simultaneously connected to a signal output pin VS2 of an oil pressure sensor P2 of a second wheel and a module conversion port PAD06 in a microcontroller chip MCU1 in the microcontroller chip unit (1); a VS3 pin is simultaneously connected to a signal output pin VS3 of an oil pressure sensor P3 of a third wheel and a module conversion port PAD05 in a microcontroller chip MCU1 in the microcontroller chip unit (1); and a VS4 pin is simultaneously connected to a signal output pin VS4 of an oil pressure sensor P4 of a fourth wheel and a module conversion port PAD04 in a microcontroller chip MCU1 in the microcontroller chip unit (1).

6. The device for measuring the wheel cylinder pressure of a vehicle according to claim 1, characterized in that: The oil pressure sensors (6) of the four wheels are respectively arranged on the wheel cylinders of the four wheels of the vehicle and are connected to the peripheral interface module (4) through a wiring harness. The vehicle-mounted ignition wire and the ground wire are respectively connected to the peripheral interface module (4) to supply power to the device.

7. The device for measuring the wheel cylinder pressure of a vehicle according to claim 1, characterized in that: The device (8) for measuring the vehicle wheel cylinder pressure, the vehicle-mounted battery (10) and the oil pressure monitoring device (7) are installed together on a vehicle frame (9); the device (8) for measuring the vehicle wheel cylinder pressure is connected to four oil pressure sensors (6) via wires; each oil pressure sensor (6) is respectively installed on a wheel brake cylinder (5) of a wheel of the vehicle; an IGN ignition power supply line of the vehicle-mounted battery (10) is electrically connected to the device (8) for measuring the vehicle wheel cylinder pressure; and a CAN line on the device (8) for measuring the vehicle wheel cylinder pressure is connected to the oil pressure monitoring device (7).

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