CN113060111B - Integrated brake electric control system and fluid supplementing method - Google Patents

Integrated brake electric control system and fluid supplementing method Download PDF

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Publication number
CN113060111B
CN113060111B CN202110379170.5A CN202110379170A CN113060111B CN 113060111 B CN113060111 B CN 113060111B CN 202110379170 A CN202110379170 A CN 202110379170A CN 113060111 B CN113060111 B CN 113060111B
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brake
control module
fluid
servo cylinder
valve
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CN113060111A (en
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郭笑通
王世双
陈润泽
孙微
刘洪宇
高明松
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FAW Group Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention discloses an integrated brake electric control system and a liquid supplementing method, and belongs to the technical field of electric control systems. A hydraulic channel is arranged between the liquid storage tank and the servo cylinder, and a one-way valve is arranged on the hydraulic channel; the integrated brake electronic control system further comprises an anti-lock module, a regenerative brake module, a brake fluid backflow control module and a valve system control module, wherein the brake fluid backflow control module receives an anti-lock function starting signal, a servo cylinder pressure signal and a regenerative brake function starting signal sent by the anti-lock module, the brake fluid backflow control module sends four wheel-side booster valve opening degree signals to the valve system control module, the valve system control module sends a pulse width modulation signal to a valve system execution mechanism, and a motor corner signal is sent to the brake fluid backflow control module from a motor corner sensor built in the permanent magnet synchronous motor. The invention can greatly reduce the switching times of the electromagnetic valve, make the fluid infusion more sufficient and make the pedal stroke more close to the target value.

Description

Integrated brake electric control system and fluid supplementing method
Technical Field
The invention relates to the technical field of electric control systems, in particular to an integrated brake electric control system and a fluid infusion method.
Background
With the rapid development of automobile intellectualization and networking, more and more vehicles are carrying integrated brake electric control systems. When the anti-lock braking system and the regenerative braking system are in action, the integrated braking electric control system can control the motor and the corresponding valve system to reduce the pressure of brake fluid at the brake caliper end, and after braking is finished, the integrated braking electric control system needs to immediately control the motor and the corresponding valve system to replenish the brake caliper end so as to counteract the influence of pressure reduction on pedal feeling. The liquid supplementing method adopted in the prior art has two problems: firstly, the electromagnetic valve must be frequently opened and closed in the process of fluid infusion, and the service life of a valve system is shortened; and secondly, the liquid can not be fully supplemented to two adjacent brakes with close intervals, so that the pedal stroke at the second time is overlong.
Disclosure of Invention
The invention aims to provide an integrated brake electric control system and a fluid infusion method, which can greatly reduce the switching times of an electromagnetic valve, make the fluid infusion amount more sufficient and make the pedal stroke more approximate to a target value.
In order to achieve the purpose, the invention adopts the following technical scheme:
an integrated brake electronic control system comprises a liquid storage tank and a servo cylinder, wherein a hydraulic channel is arranged between the liquid storage tank and the servo cylinder, and a one-way valve is arranged on the hydraulic channel, so that brake fluid can only flow into the servo cylinder from the liquid storage tank; integrated form braking electrical system still includes anti-lock module, regenerative braking module, brake fluid backflow control module and valve system control module, brake fluid backflow control module receives anti-lock function enable signal, servo cylinder pressure signal that anti-lock module sent and regenerative braking function enable signal that regenerative braking module sent, just brake fluid backflow control module sends four wheel limit booster valve opening degree signals extremely valve system control module, valve system control module sends pulse width modulation signal to valve system actuating mechanism, and built-in motor corner sensor sends motor corner signal among the permanent magnet synchronous motor extremely in the brake fluid backflow control module.
A liquid supplementing method of an integrated brake electric control system comprises the following steps:
s1, the vehicle starts braking, the brake pedal moves forward, the brake light switch signal is in a lighting state, and after a certain time period, the anti-lock function sent by the anti-lock module or the regenerative braking function of the regenerative braking module is started;
s2, after the vehicle is braked, a brake pedal moves backwards, the anti-lock function and the regenerative braking function are both quitted, and the pressure reduction process of the permanent magnet synchronous motor and the valve system control module is finished;
s3, calculating the target fluid supplementing volume V by the brake fluid backflow control moduleref；
S4, judging whether the volume of the target fluid infusion is more than 3 ml;
s5, if the target fluid infusion volume is larger than 3ml, the brake pedal continues to move backwards, and when the pressure sensor of the servo cylinder detects that the brake pressure is 0, the brake fluid in the fluid reservoir automatically flows through the one-way valve and reaches the servo cylinder to carry out fluid infusion;
s6, if the target fluid infusion volume is less than or equal to 3ml, the brake fluid backflow control module calculates the opening time T of the four wheel-side booster valvesonWhen the brake pressure detected by the pressure sensor of the servo cylinder is 0, the brake fluid backflow control module sends four opening signals of the wheel-side booster valves to the valve system control module, the valve system control module sends the pulse width modulation signal to the valve system actuating mechanism, so that the four wheel-side booster valves have the maximum opening, the opening is 100%, and the opening lasts for a time TonThen closing the brake cylinder, and replenishing the brake fluid, wherein the brake fluid in the liquid storage tank can flow through the one-way valve to flow into the servo cylinder at the same time, and the fluid is replenished at the same time;
and S7, finishing the fluid infusion process.
Alternatively, in step S2, the motor rotation angle θ at that time is detected by the motor rotation angle sensor1And detecting the brake pressure P at that time by means of a pressure sensor of the servo cylinder2。
Optionally, in step S3, the target fluid replacement volume VrefThe calculation formula of (a) is as follows:
V1＝θ1×K1
V2＝f(P2)
Vref＝V1-V2
wherein, theta1Motor rotation angle, P, detected for the motor rotation angle sensor in step S22The brake pressure detected by the pressure sensor of the servo cylinder of step 2; k1The function f is the conversion relation of the pressure volume of the brake caliper and is the conversion factor of the motor rotation angle and the liquid volume.
Optionally, in step S5, after the fluid replacement time is 0.5-0.8S, the fluid replacement process is ended.
Alternatively, in step S6, the opening times T of the four wheel-side pressure-increasing valvesonThe calculation formula of (a) is as follows:
Figure BDA0003012175910000031
wherein D is the flow rate of each wheel-side pressure increasing valve.
Compared with the prior art, the invention has the beneficial effects that: the integrated brake electronic control system of the embodiment is additionally provided with a hydraulic channel from the liquid storage tank to the servo cylinder, so that the liquid can be supplemented in a mode that the target liquid supplement volume is small and the target liquid supplement volume directly flows to the servo cylinder through the liquid storage tank and then flows to the four brake calipers, under the frequently started regenerative braking function, the four wheel-side pressure valves do not need to be frequently opened for liquid supplement, and the service life of the wheel-side pressure valves can be greatly prolonged. In addition, when the wheel-side pressure increasing valve starts to intervene in the fluid infusion process, the fluid infusion starting time is set at the time when the pressure is 0, the brake pedal does not return completely at the time, most of the fluid infusion process is finished when the brake pedal returns completely, the fluid infusion process is completely finished when the adjacent two braking intervals are close, and the pedal stroke during the next braking cannot be too large. In conclusion, the integrated brake electronic control system can greatly reduce the switching times of the electromagnetic valve, make the fluid infusion amount more sufficient and make the pedal stroke more close to the target value.
Drawings
Fig. 1 is a hardware schematic diagram of an integrated brake electronic control system according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a fluid supplementing method of an integrated brake electronic control system according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
An integrated brake electronic system according to an embodiment of the present invention will be described with reference to fig. 1.
As shown in fig. 1, the embodiment provides an integrated brake electronic control system, which includes a liquid storage tank and a servo cylinder, wherein a hydraulic channel is arranged between the liquid storage tank and the servo cylinder, and a check valve is installed on the hydraulic channel, so that brake fluid can only flow from the liquid storage tank to the servo cylinder; the integrated brake electronic control system further comprises an anti-lock module, a regenerative brake module, a brake fluid backflow control module and a valve system control module, wherein the brake fluid backflow control module receives an anti-lock function starting signal, a servo cylinder pressure signal and a regenerative brake function starting signal sent by the anti-lock module, the brake fluid backflow control module sends four wheel-side booster valve opening degree signals to the valve system control module, the valve system control module sends a pulse width modulation signal to a valve system execution mechanism, and a motor corner sensor built in the permanent magnet synchronous motor sends a motor corner signal to the brake fluid backflow control module.
It should be noted that, the integrated brake electronic control system of the embodiment adds a hydraulic channel from the liquid storage tank to the servo cylinder, so that when the target fluid infusion volume is small, fluid infusion can be performed in a manner that the fluid directly flows from the liquid storage tank to the servo cylinder and then flows to the four brake calipers. In addition, when the wheel-side pressure increasing valve starts to intervene in the fluid infusion process, the fluid infusion starting time is set at the time when the pressure is 0, the brake pedal does not return completely at the time, most of the fluid infusion process is finished when the brake pedal returns completely, the fluid infusion process is completely finished when the adjacent two braking intervals are close, and the pedal stroke during the next braking cannot be too large. In conclusion, the integrated brake electronic control system can greatly reduce the switching times of the electromagnetic valve, make the fluid infusion amount more sufficient and make the pedal stroke more close to the target value.
The fluid replenishment method of the integrated brake electronic control system according to the embodiment of the invention is described below with reference to fig. 2.
A liquid supplementing method of an integrated brake electric control system comprises the following steps of:
s1, the vehicle starts braking, the brake pedal moves forward, the brake light switch signal is in a lighting state, and after a certain time period, the anti-lock function sent by the anti-lock module or the regenerative braking function of the regenerative braking module is started;
s2, after the vehicle is braked, the brake pedal moves backwards, the anti-lock function and the regenerative braking function are both quitted, and the pressure reduction process of the permanent magnet synchronous motor and the valve system control module is finished;
s3, calculating the target fluid supplementing volume V by the brake fluid backflow control moduleref；
S4, judging whether the volume of the target fluid infusion is more than 3 ml;
s5, if the volume of the target fluid infusion is larger than 3ml, the brake pedal continues to move backwards, and when the pressure sensor of the servo cylinder detects that the brake pressure is 0, the brake fluid in the fluid reservoir automatically flows through the one-way valve and reaches the servo cylinder to carry out fluid infusion;
s6, if the target fluid infusion volume is less than or equal to 3ml, the opening time T of the four wheel-side booster valves is calculated by the brake fluid backflow control moduleonWhen the brake pressure detected by a pressure sensor of the servo cylinder is 0, the brake fluid backflow control module sends opening signals of the four wheel-side booster valves to the valve system control module, the valve system control module sends pulse width modulation signals to the valve system actuating mechanism, the opening of the four wheel-side booster valves is enabled to be maximum, the opening is 100%, and the opening lasts for TonThen closing the valve and replenishing the fluid, wherein the brake fluid in the fluid reservoir can flow into the servo cylinder through the one-way valve and is replenished at the same time;
and S7, finishing the fluid infusion process.
In both steps S5 and S6, the brake fluid in the reservoir tank automatically flows through the check valve into the servo cylinder due to the difference in the height of the brake fluid, and the fluid is replenished. The integrated brake electronic control system is additionally provided with a hydraulic channel from the liquid storage tank to the servo cylinder, and the one-way valve is additionally arranged in the hydraulic channel, so that the brake fluid can only flow into the servo cylinder through the liquid storage tank and can not flow back, the target fluid supplementing volume can directly flow into the servo cylinder through the liquid storage tank and then flow into the four brake calipers for fluid supplementing in a mode of small volume, under the frequently started regenerative brake function, the four wheel-side pressure increasing valves are not required to be frequently opened for fluid supplementing, and the service life of the wheel-side pressure increasing valves can be greatly prolonged; when the wheel-side pressure increasing valve starts to intervene in the liquid supplementing process, the moment for starting liquid supplementing is set at the moment when the pressure is 0, the brake pedal does not return completely at the moment, and the situation that when the brake pedal returns completely, most of liquid supplementing processes are completed can be guaranteed, the situation that the liquid supplementing process is completed when the adjacent two braking intervals are close can be guaranteed, and further the pedal stroke during the next braking is guaranteed not to be too large.
Alternatively, in step S2, the motor rotation angle θ at that time is detected by the motor rotation angle sensor1And detecting the brake pressure P at that time by means of a pressure sensor of the servo cylinder2Is convenient for calculating the target fluid infusion volume Vref。
Optionally, in step S3, the target fluid replacement volume VrefThe calculation formula of (a) is as follows:
V1＝θ1×K1
V2＝f(P2)
Vref＝V1-V2
wherein, theta1Motor rotation angle, P, detected for the motor rotation angle sensor in step S22The brake pressure detected by the pressure sensor of the servo cylinder in the step 2; k1The function f is the conversion relation of the pressure volume of the brake caliper and is the conversion factor of the motor rotation angle and the liquid volume.
Optionally, in step S5, after the fluid replacement time is 0.5-0.8S, the fluid replacement process is ended.
Alternatively, in step S6, the opening times T of the four wheel-side pressure-increasing valvesonThe calculation formula of (a) is as follows:
Figure BDA0003012175910000071
wherein D is the flow rate of each wheel-side pressure increasing valve.
In the description herein, references to the description of "some embodiments," "other embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Further, it is to be understood that the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, which is for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "mounted," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. Those skilled in the art can understand the above specific meanings included in the present invention according to specific situations.
Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims (5)

1. A liquid supplementing method of an integrated brake electric control system comprises a liquid storage tank and a servo cylinder, and is characterized in that a hydraulic channel is arranged between the liquid storage tank and the servo cylinder, and a one-way valve is mounted on the hydraulic channel, so that brake liquid can only flow into the servo cylinder from the liquid storage tank; integrated form braking electrical system still includes anti-lock module, regenerative braking module, brake fluid backflow control module and valve system control module, brake fluid backflow control module receives anti-lock function enable signal, servo cylinder pressure signal that anti-lock module sent and regenerative braking function enable signal that regenerative braking module sent, just brake fluid backflow control module sends four wheel limit booster valve opening degree signals extremely in the valve system control module, valve system control module sends pulse width modulation signal to valve system actuating mechanism, and built-in motor corner sensor sends motor corner signal among the permanent magnet synchronous motor extremely in the brake fluid backflow control module, its characterized in that includes following step:
s1, the vehicle starts braking, the brake pedal moves forward, the brake light switch signal is in a lighting state, and after a certain time period, the anti-lock function sent by the anti-lock module or the regenerative braking function of the regenerative braking module is started;
s2, after the vehicle is braked, a brake pedal moves backwards, the anti-lock function and the regenerative braking function are both quitted, and the pressure reduction process of the permanent magnet synchronous motor and the valve system control module is finished;
s3, calculating the target fluid supplementing volume V by the brake fluid backflow control moduleref；
S4, judging whether the volume of the target fluid infusion is more than 3 ml;
s5, if the target fluid infusion volume is larger than 3ml, the brake pedal continues to move backwards, and when the pressure sensor of the servo cylinder detects that the brake pressure is 0, the brake fluid in the fluid reservoir automatically flows through the one-way valve and reaches the servo cylinder to carry out fluid infusion;
s6, if the target fluid infusion volume is less than or equal to 3ml, the brake fluid backflow control module calculates the opening time T of the four wheel-side booster valvesonWhen the brake pressure detected by the pressure sensor of the servo cylinder is 0, the brake fluid backflow control module sends four opening signals of the wheel-side booster valves to the valve system control module, the valve system control module sends the pulse width modulation signal to the valve system actuating mechanism, so that the four wheel-side booster valves have the maximum opening, the opening is 100%, and the opening lasts for a time TonThen closing the brake cylinder, and replenishing the brake fluid, wherein the brake fluid in the liquid storage tank can flow through the one-way valve to flow into the servo cylinder at the same time, and the fluid is replenished at the same time;
and S7, finishing the fluid infusion process.
2. The fluid replacement method for the integrated brake electronic control system according to claim 1, wherein in step S2, the motor rotation angle θ at that time is detected by the motor rotation angle sensor1And detecting the brake pressure P at that time by means of a pressure sensor of the servo cylinder2。
3. The fluid replacement method for an integrated brake electronic control system according to claim 2, wherein in step S3, the target fluid replacement volume VrefThe calculation formula of (a) is as follows:
V1＝θ1×K1
V2＝f(P2)
Vref＝V1-V2
wherein, theta1The motor rotation angle sensor in step S2Detected motor angle, P2A brake pressure detected by the pressure sensor of the servo cylinder of step S2; k1The function f is the conversion relation of the pressure volume of the brake caliper and is the conversion factor of the motor rotation angle and the liquid volume.
4. The fluid replacement method for the integrated brake electronic control system according to claim 1, wherein in step S5, the fluid replacement process is finished after the fluid replacement time is 0.5-0.8S.
5. The fluid replacement method for the integrated brake electronic control system according to claim 3, wherein in step S6, the opening times T of four wheel-side pressure increase valvesonThe calculation formula of (a) is as follows:
Figure FDA0003413368640000021
wherein D is the flow rate of each wheel-side pressure increasing valve.
CN202110379170.5A 2021-04-08 2021-04-08 Integrated brake electric control system and fluid supplementing method Active CN113060111B (en)

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JP4147850B2 (en) * 2002-02-15 2008-09-10 日産自動車株式会社 Braking control device
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CN204605776U (en) * 2015-03-27 2015-09-02 吉林大学 There is the line traffic control of manpower amplification and the brake system of power-assisted complex function
CN106891878B (en) * 2017-01-17 2023-05-23 吉林大学 Motor-driven electronic hydraulic brake system with improved master cylinder

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