Air pressure type electronic parking and anti-lock braking integrated control system

Abstract

The invention relates to the technical field of automobile brake control, and discloses an air pressure type electronic parking and anti-lock braking integrated control system which comprises a central control unit, a slave control unit, an EPB switch, an EPB electromagnetic valve, an air pressure sensor, a wheel speed sensor and an ABS electromagnetic valve. The slave control units are directly connected with the central control unit respectively; the number of the slave control units can be expanded according to different vehicle types, and installation and maintenance are convenient and fast. According to the system, the hardware cost is greatly reduced, the integration level of the system is improved, and the system functions are richer.

Description

Technical Field

[0001] The invention relates to the technical field of automobile brake control, in particular to a pneumatic electronic parking and anti-lock brake integrated control system. Background Art

[0002] With the development of active safety, assisted driving and autonomous driving technologies, the number of brake controllers (ECUs) installed on commercial vehicles is increasing, which increases the production cost of vehicles. In addition, due to the large number of controllers, the complexity of bus communication load and wiring harness layout has increased, which has brought great troubles to the later maintenance and repair of the control system, which is not conducive to the further development of vehicle brake control systems. Therefore, integrated development has become the trend of future vehicle controller design and development.

[0003] The electronic parking brake system EPB is commonly known as the electronic handbrake. Compared with the traditional mechanical handbrake that locks the wheels by manually triggering the mechanical structure, the EPB adopts electronic button control and uses electrical actuators to lock and release the car wheels to prevent the wheels from rolling under abnormal circumstances. It has the characteristics of easy operation, multiple functions and high safety.

[0004] The pneumatic anti-lock braking system ABS monitors the movement status of the wheels in real time through wheel speed sensors, and transmits relevant signals to the electronic controller for processing. It adjusts the braking pressure of each wheel during braking to prevent the wheels from locking, thereby ensuring the vehicle's directional stability and braking efficiency during braking, and effectively improving vehicle braking safety.

[0005] Currently, the EPB function and ABS function are implemented separately through two controllers. If the electronic parking and anti-lock braking functions need to be realized at the same time, there will be problems such as high system cost and complex wiring harness layout. Summary of the invention

[0006] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a pneumatic electronic parking and anti-lock braking integrated control system, which integrates the EPB system and the ABS system, greatly reduces the hardware cost, and at the same time improves the system's integration, making the system more functional.

[0007] The technical solution adopted by the present invention is: a pneumatic electronic parking and anti-lock brake integrated control system, including a central control unit, a slave control unit, an EPB switch, an EPB solenoid valve, an air pressure sensor, a wheel speed sensor, and an ABS solenoid valve; the slave control units are directly connected to the central control unit; the EPB switch is installed in the cab; the EPB solenoid valve is installed on the controlled wheel axle; the air pressure sensor is installed on the spring parking brake air chamber; the wheel speed sensor is installed on the axle near each wheel; the ABS solenoid valve is installed on each wheel brake circuit. The system includes an ABS fault warning light and an EPB fault warning light, which are respectively connected to the central control unit and installed in the cab. The central control unit includes an anti-reverse circuit, a power module, a solenoid valve control module, an MCU, a communication module, an ADC acquisition module, an alarm module, an acceleration sensor module, an air pressure sensor module, a switch module, a wheel speed processing module, a retarder module, and a terminal interface; the input power is output to the power module through the anti-reverse circuit, and the power module is connected to the solenoid valve control module, the MCU, the acceleration sensor module, the air pressure sensor module, the switch module and the wheel speed processing module; the MCU is connected to the solenoid valve control module, the communication module, the alarm module, the acceleration sensor module, the switch module and the retarder module; the MCU is respectively connected to the power module, the air pressure sensor module, the switch module and the wheel speed processing module through the ADC acquisition module; the terminal interface is directly connected to the solenoid valve control module, the communication module, the alarm module, the air pressure sensor module, the switch module, the wheel speed processing module and the retarder module; the communication module includes CAN bus and K line communication.

[0008] Compared with the prior art, the present invention has the following beneficial effects: One controller can realize electronic parking and anti-lock braking functions at the same time. And because the two are integrated, the ABS can be used to realize temporary parking function according to actual conditions, thus saving compressed air, improving energy efficiency and saving hardware costs. Built-in acceleration sensor can monitor the inclination angle between the vehicle and the ground, and realize hill start assist and anti-slip function; When a vehicle has multiple sets of drive wheels or multiple sets of wheels, functions can be expanded by adding slave control units to the system, making repair and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic structural diagram of an embodiment of the pneumatic electronic parking and anti-lock brake integrated control system of the present invention; Figure 2 This is the hardware principle diagram of the pneumatic electronic parking and anti-lock brake integrated control system ECU of the present invention; Among them: 1-central control unit, 2-EPB switch, 3-EPB solenoid valve, 4-air pressure sensor, 5-wheel speed sensor, 6-ABS solenoid valve, 7-EPB warning light, 8-ABS warning light, 9-CAN bus and K line, 10-wheel, 11-ring gear, 12-slave control unit. Implementation

[0010] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0011] See also Figure 1 , the structure of the embodiment of the pneumatic electronic parking and anti-lock brake integrated control system in the present invention is described in detail, including a central control unit, an EPB switch, an EPB solenoid valve, an air pressure sensor, a wheel speed sensor, a ring gear, and an ABS solenoid valve. The EPB switch is installed in the cab to perform parking and releasing operations; the EPB solenoid valve is installed on the controlled wheel axle and is connected to the central control unit; the air pressure sensor is installed on the spring parking brake air chamber to monitor the brake air chamber pressure, and is connected to the central control unit to feed back the pressure to the central control unit for detecting the state of the solenoid valve and performing fault diagnosis; the wheel speed sensors are respectively installed on the brake bottom plates beside each wheel, and the four wheel speed sensors are respectively connected to the central control unit; the ring gears are respectively installed on each wheel; the ABS solenoid valves are respectively installed at the front end of each wheel brake, and the EPB warning light and the ABS warning light are connected to the central control unit and installed in the cab. For different vehicle models in actual use, a slave control unit can be installed according to specific needs. When installing a slave control unit, a wiring harness is connected to the slave control unit separately, and connected to the central control unit through the CAN bus. The central control unit coordinates the control unit through the CAN signal, thereby realizing system function expansion and meeting the use needs of multi-axle models.

[0012] See attached Figure 2, mainly describes the composition structure of the central control unit of the pneumatic electronic parking and anti-lock braking integrated control system provided by the present invention, including an anti-reverse circuit, a power module, a solenoid valve control module, a micro control unit (MCU), a communication module, an ADC acquisition module, an alarm module, an acceleration sensor module, an air pressure sensor module, a switch module, a wheel speed processing module, a retarder module, and a terminal interface; the input power is output to the power module through the anti-reverse circuit, and the power module is connected to the solenoid valve control module, the MCU, the acceleration sensor module, the air pressure sensor module, the switch module and the wheel speed processing module; the MCU is connected to the solenoid valve control module, the communication module, the alarm module, the acceleration sensor module, the switch module and the retarder module; the MCU is respectively connected to the power module, the air pressure sensor module, the switch module and the wheel speed processing module through the ADC acquisition module; the terminal interface is directly connected to the solenoid valve control module, the communication module, the alarm module, the air pressure sensor module, the switch module, the wheel speed processing module and the retarder module; the communication module includes CAN bus and K line communication. The anti-reverse circuit is used to avoid circuit damage caused by reverse power connection; the power module provides various voltages for the system; the solenoid valve control module is used to realize the logical control of the solenoid valve; the communication module is used to realize the information exchange between the inside and outside of the system; the ADC acquisition module is used to monitor the voltage and air pressure status; the alarm module is used to control the alarm light; the built-in acceleration sensor is used to monitor the inclination angle between the vehicle and the ground, realize hill start assist and anti-slip; the air pressure sensor is used to monitor the brake chamber pressure, detect the solenoid valve status and perform fault diagnosis; the switch module is used to implement key operations; the wheel speed signal processing module processes the data collected by the wheel speed sensor and passes the processed data to the MCU.

[0013] In the embodiment, after the driver operates the EPB switch installed in the cab, the relevant electrical signal is transmitted to the central control unit through the wiring harness. For example, when the vehicle stops, the driver presses the parking button. After the central control unit receives the relevant electrical signal, it is processed by its hardware system and identified by software, and it is determined that the parking command needs to be executed. The central control unit collects data from external related sensors, and at the same time obtains relevant vehicle operating parameters (vehicle speed, brake signal, etc.) from the CAN bus, and makes a judgment to determine whether it is necessary to respond to the driver's parking operation requirements. If it is found that the current vehicle state does not meet the parking requirements, it is considered to be a human error. If it is judged that it meets the requirements, the EPB parking solenoid valve is opened to realize the parking action; the release button operation is similar, and the release solenoid valve is opened to reduce the braking pressure of the controlled wheel to release the wheel.

[0014] In the embodiment, the controller receives wheel speed signals collected by four wheel speed sensors, and drives the corresponding boost valve or pressure reducing valve inside the ABS solenoid valve according to the built-in control strategy to adjust the braking pressure of the four wheels to prevent the wheels from locking during braking, thereby ensuring the directional stability of the vehicle during braking and improving the braking efficiency, thereby enhancing braking stability and safety.

Claims

1. A pneumatic electronic parking and anti-lock brake integrated control system, characterized in that: The system includes a central control unit, a slave control unit, an EPB switch, an EPB solenoid valve, an air pressure sensor, a wheel speed sensor, and an ABS solenoid valve; the slave control units are directly connected to the central control unit; the EPB switch is installed in the cab; the EPB solenoid valve is installed on the controlled wheel axle; the air pressure sensor is installed on the spring parking brake air chamber; the wheel speed sensors are installed on the axles near each wheel; and the ABS solenoid valves are installed on the brake circuits of each wheel.

2. The pneumatic electronic parking and anti-lock brake integrated control system according to claim 1, characterized in that: The system comprises an ABS fault warning lamp and an EPB fault warning lamp, which are respectively connected to a central control unit and installed in a cab.

3. The pneumatic electronic parking and anti-lock brake integrated control system according to claim 1, characterized in that: The central control unit includes an anti-reverse circuit, a power module, a solenoid valve control module, an MCU, a communication module, an ADC acquisition module, an alarm module, an acceleration sensor module, an air pressure sensor module, a switch module, a wheel speed processing module, a retarder module, and a terminal interface; the input power is output to the power module through the anti-reverse circuit, and the power module is connected to the solenoid valve control module, the MCU, the acceleration sensor module, the air pressure sensor module, the switch module and the wheel speed processing module; the MCU is connected to the solenoid valve control module, the communication module, the alarm module, the acceleration sensor module, the switch module and the retarder module; the MCU is respectively connected to the power module, the air pressure sensor module, the switch module and the wheel speed processing module through the ADC acquisition module; the terminal interface is directly connected to the solenoid valve control module, the communication module, the alarm module, the air pressure sensor module, the switch module, the wheel speed processing module and the retarder module; the communication module includes CAN bus and K line communication.

Images