CN112660086A

CN112660086A - Electro-hydraulic brake-by-wire system

Info

Publication number: CN112660086A
Application number: CN202011424114.0A
Authority: CN
Inventors: 刘嘉; 罗映; 张宜鲁
Original assignee: Shandong Promote Electromechanical Technology Co ltd; Taiyuan Institute of Technology
Current assignee: Shandong Promote Electromechanical Technology Co ltd; Taiyuan Institute of Technology
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-04-16

Abstract

The invention provides an electro-hydraulic brake-by-wire system, which comprises a PWM (pulse-width modulation), an ABS (anti-lock brake system), a storage battery, an analog-digital converter, a switch, a power CAN (controller area network) controller, a whole vehicle CAN controller, a first download interface and a second download interface, wherein the magnitude of a pressure sensor signal in the ABS pump CAN be obtained through an analog quantity signal so as to calibrate the magnitude of brake pressure, so that the ideal brake effect CAN be achieved through closed-loop control according to a brake pressure value, meanwhile, the current vehicle speed CAN be obtained through the analog quantity signal, the ABS pump CAN be actively controlled to be switched to a pressure maintaining state according to vehicle speed information, the working time of a motor of the ABS pump is shortened; by controlling the change of high-low side power output and PWM power output, the state of each valve in the ABS pump and the opening degree of the linear solenoid valve can be controlled, thereby achieving the effects of pressure increasing, pressure maintaining and pressure reducing to realize the corresponding braking function according to different line control instructions.

Description

Electro-hydraulic brake-by-wire system

Technical Field

The invention relates to the technical field of brake systems, in particular to an electro-hydraulic brake-by-wire system.

Background

The ABS system is an improved technology on the basis of a conventional brake device, can be divided into a mechanical type and an electronic type, and a large number of anti-lock brake systems are installed on modern automobiles, have the braking function of a common brake system, can prevent wheels from being locked, can still steer the automobiles in a braking state, ensure the stability of the braking direction of the automobiles, prevent sideslip and deviation, and are the most advanced brake devices with the best braking effect on the automobiles at present; in the existing ABS system, its universal control method is to add the pull-wire motor on the brake pedal, the control module drives the motor to drive the brake pedal to act according to the command message of the upper computer, thereby realizing its brake-by-wire function, but the pull-wire motor added on the brake pedal influences the comfort level of the driver for trampling the brake pedal and the trampling area, the driver is easy to trample the pull-wire motor in the process of trampling the brake pedal, and then influence the control accuracy of the motor, reduce the braking performance of the system, therefore it is necessary to provide a new brake control system, further improve the braking accuracy.

Disclosure of Invention

In view of the above-mentioned deficiency, the invention provides an electrohydraulic brake-by-wire system.

The technical scheme adopted by the invention for solving the technical problems is as follows: an electro-hydraulic brake-by-wire system comprises a PWM (pulse-width modulation), an ABS (anti-lock brake system) pump, a storage battery, an analog-digital converter, a switch, a power CAN controller, a whole vehicle CAN controller, a first download interface and a second download interface, wherein the PWM is connected with the ABS pump through a lead; the power supply of the storage battery is 12V, and the storage battery is respectively connected with the PWM and the ABS pump through leads; the analog-digital converter, the switch, the power CAN controller, the whole vehicle CAN controller, the first download interface and the second download interface are electrically connected with the PWM.

As optimization, the negative electrode of the storage battery is connected with the port 90 of the PWM through a lead; the analog-digital converter is connected with a port 90 of the PWM through a conducting wire; the switch is connected to the PWM port 30 by a wire.

Preferably, the power CAN controller is electrically connected with the port 47 and the port 17 of the PWM.

For optimization, the high-order data line CAN-H of the finished automobile CAN controller is connected with the port 48 of the PWM, and the low-order data line CAN-H of the finished automobile CAN controller is connected with the port 18 of the PWM.

As an optimization, the port 1, the port 2, the port 3 and the port 9 of the first download interface are respectively connected with the port 76, the port 77, the port 78 and the port 66 of the PWM.

Preferably, the port 2, the port 3 and the port 6 of the second download interface are respectively connected with the port 15, the port 45 and the port 76 of the PWM.

Preferably, the port 13 of the PWM is externally connected with an artificial brake control line.

Preferably, the ABS pump comprises a suction valve, an isolation valve, a pressure increasing valve, a pressure reducing valve and an ABS pump motor, wherein the upper port 17 and the port 10 of the suction valve are connected with the port 82 and the port 21 of the PWM, and the lower port 18 and the port 11 of the suction valve are connected with the positive pole of the storage battery; the upper port 23 and the port 4 of the isolation valve are connected with the port 85 and the port 25 of the PWM, and the lower port 21 and the port 5 of the isolation valve are connected with the anode of the storage battery; the upper port 11, the port 8, the port 2 and the port 21 of the pressure increasing valve are connected with the port 57, the port 87, the port 26 and the port 56 of the PWM; the upper port 19, the port 12, the port 6 and the port 25 of the pressure reducing valve are connected with the port 20, the port 50, the port 80 and the port 19 of the PWM, and the lower port 20, the port 18, the port 7 and the port 25 of the pressure reducing valve are connected with the positive pole of the storage battery.

Preferably, the upper port 33, the port 34, the port 35, the port 36, the port 15, the port 9, the port 3 and the port 22 of the ABS pump motor are connected with the port 24, the port 5, the port 7, the port 67, the port 38, the port 58, the port 88 and the port 27 of the PWM, and the lower port 16 of the ABS pump motor is connected with the positive electrode of the battery.

The invention has the beneficial effects that:

1. according to the invention, the analog-digital converter is arranged, the signal of the pressure sensor in the ABS pump is obtained through the analog quantity signal, and the magnitude of the brake pressure is calibrated according to the signal of the pressure sensor, so that the ideal brake effect is achieved by utilizing the closed-loop control of the brake pressure numerical value, and the more accurate brake control is realized; meanwhile, the ABS pump can be actively controlled to be switched to a pressure maintaining state according to the vehicle speed information, so that the working time of the motor of the ABS pump is shortened, and the working life of the motor of the ABS pump is prolonged;

2. according to the invention, the states of all valves in the ABS pump and the opening of the linear solenoid valve are controlled by controlling the change of high-low side power output and PWM power output, so that the effects of pressurization, pressure maintaining and pressure reduction are achieved, and the corresponding braking function is realized according to different line control instructions;

3. according to the invention, the mechanical structure of the brake pedal is reduced, a brake displacement sensor is not additionally arranged to detect the displacement of the brake pedal, the structure is simple, and the potential safety hazard is reduced;

4. the invention can be controlled in a closed loop according to the vehicle speed and the brake pressure signal, can ensure the maintenance of the brake pressure, can not cause the pressure to be reduced along with the time extension, can be adapted to different vehicles, reduces the repeated calibration work, and has wider adaptability.

Drawings

Fig. 1 is a circuit block diagram of the present invention.

FIG. 2 is a block diagram of an ABS pump configuration of the present invention.

The numerals in the figures are indicated as follows:

1. PWM, 2, ABS pump, 21, suction valve, 22, isolation valve, 23, pressure increasing valve, 24, pressure reducing valve, 25, ABS pump motor, 3, storage battery, 4, analog-digital converter, 5, switch, 6, power CAN controller, 7, vehicle CAN controller, 8, first download interface, 9, second download interface.

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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

The electro-hydraulic brake-by-wire system shown in fig. 1 to 2 comprises a PWM1, an ABS pump 2, a storage battery 3, an analog-digital converter 4, a switch 5, a power CAN controller 6, a vehicle CAN controller 7, a first download interface 8 and a second download interface 9, wherein the PWM1 is connected with the ABS pump 2 through a wire; the power supply of the storage battery 3 is 12V, and the storage battery 3 is respectively connected with the PWM1 and the ABS pump 2 through leads; the analog-digital converter 4, the switch 5, the power CAN controller 6, the whole vehicle CAN controller 7, the first download interface 8 and the second download interface 9 are electrically connected with the PWM 1.

In the present embodiment, the negative electrode of the battery 3 is connected to the port 90 of the PWM1 through a wire; the analog-digital converter 4 is connected with a port 90 of the PWM1 through a lead; the switch 5 is connected by a conductor to port 30 of PWM 1.

In this embodiment, the power CAN controller 6 is electrically connected to the port 47 and the port 17 of the PWM 1.

In this embodiment, the high-order data line CAN-H of the entire vehicle CAN controller 7 is connected to the port 48 of the PWM1, and the low-order data line CAN-H of the entire vehicle CAN controller 7 is connected to the port 18 of the PWM 1.

In the present embodiment, the port 1, the port 2, the port 3 and the port 9 of the first download interface 8 are respectively connected with the port 76, the port 77, the port 78 and the port 66 of the PWM 1.

In this embodiment, the port 2, the port 3 and the port 6 of the second download interface 9 are connected to the port 15, the port 45 and the port 76 of the PWM1, respectively.

In this embodiment, the port 13 of the PWM1 is externally connected with an artificial brake control line.

In the embodiment, the ABS pump 2 includes a suction valve 21, an isolation valve 22, a pressure increasing valve 23, a pressure reducing valve 24 and an ABS pump motor 25, the upper port 17 and the port 10 of the suction valve 21 are connected to the port 82 and the port 21 of the PWM1, and the lower port 18 and the port 11 of the suction valve 21 are connected to the positive electrode of the battery 3; the upper port 23 and the port 4 of the isolation valve 22 are connected with the port 85 and the port 25 of the PWM1, and the lower port 21 and the port 5 of the isolation valve 22 are connected with the positive pole of the storage battery 3; the upper port 11, the port 8, the port 2 and the port 21 of the pressure increasing valve 23 are connected with the port 57, the port 87, the port 26 and the port 56 of the PWM 1; the port 19, the port 12, the port 6 and the port 25 on the pressure reducing valve 24 are connected with the port 20, the port 50, the port 80 and the port 19 of the PWM1, and the port 20, the port 18, the port 7 and the port 25 on the pressure reducing valve 24 are connected with the anode of the battery 3.

In the present embodiment, the upper port 33, the port 34, the port 35, the port 36, the port 15, the port 9, the port 3 and the port 22 of the ABS pump motor 25 are connected to the port 24, the port 5, the port 7, the port 67, the port 38, the port 58, the port 88 and the port 27 of the PWM1, and the lower port 16 of the ABS pump motor 25 is connected to the positive electrode of the battery 3.

In this embodiment, the lower port 17 of the ABS pump motor 25 is commonly grounded with the port 89 of the PWM 1.

The working principle is as follows: the magnitude of the pressure sensor signal in the ABS pump 2 is obtained through the analog quantity signal and is sent to an upper computer through a power CAN controller 6 and a whole vehicle CAN controller 7, the upper computer issues different brake instruction information according to the requirement, the state of each valve in the ABS pump 2 and the opening degree of the linear solenoid valve are controlled by controlling the change of high-low side power output and PWM power output, thereby realizing the closed-loop control according to the brake pressure value to achieve the ideal brake effect, simultaneously obtaining the current vehicle speed through the analog quantity signal, the ABS pump 2 may be actively controlled to switch to the pressure-maintaining state according to the vehicle speed information, for example, when the vehicle speed reaches a certain threshold value, namely, the ABS pump is controlled to automatically enter a pressure maintaining state, thereby reducing the working time of the ABS pump motor 25, prolonging the service life, under the drive-by-wire mode, when a driver steps on a brake pedal, the electro-hydraulic drive-by-wire system exits the drive-by-wire mode and switches to the original ABS pump function.

The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.

Claims

1. An electro-hydraulic brake-by-wire system, characterized in that: the device comprises a PWM (1), an ABS pump (2), a storage battery (3), an analog-digital converter (4), a switch (5), a power CAN controller (6), a whole vehicle CAN controller (7), a first download interface (8) and a second download interface (9), wherein the PWM (1) is connected with the ABS pump (2) through a wire; the power supply of the storage battery (3) is 12V, and the storage battery (3) is respectively connected with the PWM (1) and the ABS pump (2) through conducting wires; analog-digital converter (4), switch (5), power CAN controller (6), whole car CAN controller (7), first download interface (8) and second download interface (9) all with PWM (1) electric connection.

2. The electro-hydraulic brake-by-wire system of claim 1, wherein: the negative electrode of the storage battery (3) is connected with the port 90 of the PWM (1) through a lead; the analog-digital converter (4) is connected with a port 90 of the PWM (1) through a lead; the switch (5) is connected with the port 30 of the PWM (1) through a conducting wire.

3. The electro-hydraulic brake-by-wire system of claim 2, wherein: and the power CAN controller (6) is electrically connected with the port 47 and the port 17 of the PWM (1).

4. The electro-hydraulic brake-by-wire system of claim 3, wherein: the high-order data line CAN-H of the whole vehicle CAN controller (7) is connected with the port 48 of the PWM (1), and the low-order data line CAN-H of the whole vehicle CAN controller (7) is connected with the port 18 of the PWM (1).

5. The electro-hydraulic brake-by-wire system of claim 4, wherein: the port 1, the port 2, the port 3 and the port 9 of the first download interface (8) are respectively connected with the port 76, the port 77, the port 78 and the port 66 of the PWM (1).

6. The electro-hydraulic brake-by-wire system of claim 5, wherein: and the port 2, the port 3 and the port 6 of the second download interface (9) are respectively connected with the port 15, the port 45 and the port 76 of the PWM (1).

7. The electro-hydraulic brake-by-wire system of claim 6, wherein: and a port 13 of the PWM (1) is externally connected with an artificial brake control line.

8. The electro-hydraulic brake-by-wire system of claim 7, wherein: the ABS pump (2) comprises a suction valve (21), an isolation valve (22), a pressure increasing valve (23), a pressure reducing valve (24) and an ABS pump motor (25), wherein an upper port 17 and a port 10 of the suction valve (21) are connected with a port 82 and a port 21 of the PWM (1), and a lower port 18 and a port 11 of the suction valve (21) are connected with the positive pole of a storage battery (3); the upper port 23 and the port 4 of the isolation valve (22) are connected with the port 85 and the port 25 of the PWM (1), and the lower port 21 and the port 5 of the isolation valve (22) are connected with the positive pole of the storage battery (3); the upper port 11, the port 8, the port 2 and the port 21 of the pressure increasing valve (23) are connected with the port 57, the port 87, the port 26 and the port 56 of the PWM (1); the port 19, the port 12, the port 6 and the port 25 on the pressure reducing valve (24) are connected with the port 20, the port 50, the port 80 and the port 19 of the PWM (1), and the port 20, the port 18, the port 7 and the port 25 on the lower end of the pressure reducing valve (24) are connected with the positive pole of the storage battery (3).

9. The electro-hydraulic brake-by-wire system of claim 8, wherein: the upper port 33, the port 34, the port 35, the port 36, the port 15, the port 9, the port 3 and the port 22 of the ABS pump motor (25) are connected with the port 24, the port 5, the port 7, the port 67, the port 38, the port 58, the port 88 and the port 27 of the PWM (1), and the lower port 16 of the ABS pump motor (25) is connected with the positive pole of the storage battery (3).

10. The electro-hydraulic brake-by-wire system of claim 9, wherein: the lower port 17 of the ABS pump motor (25) and the port 89 of the PWM (1) are grounded together.