CN113561953A - Line-controlled redundant brake control system of heavy-duty vehicle and fault-tolerant control method thereof - Google Patents

Line-controlled redundant brake control system of heavy-duty vehicle and fault-tolerant control method thereof Download PDF

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Publication number
CN113561953A
CN113561953A CN202110850641.6A CN202110850641A CN113561953A CN 113561953 A CN113561953 A CN 113561953A CN 202110850641 A CN202110850641 A CN 202110850641A CN 113561953 A CN113561953 A CN 113561953A
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brake
oil
valve
control
pressure
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CN113561953B (en
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简洪超
顾宏弢
毛福合
潘嘉明
罗小梅
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China North Vehicle Research Institute
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China North Vehicle Research Institute
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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
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • 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
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/82—Brake-by-Wire, EHB

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention discloses a wire-controlled redundant brake control system of a heavy-duty vehicle, which comprises: the oil supply subsystem, the control valve group and the execution assembly are sequentially connected through a hydraulic oil circuit; wherein the control valve group comprises: more than two proportional solenoid valves and redundant control components; the execution component includes: more than two brake cylinders; the output oil port of the oil supply subsystem is simultaneously connected with more than two proportional electromagnetic valves, and the more than two proportional electromagnetic valves are respectively connected with more than two brake cylinders through redundant control components; the redundant control assembly enables more than one passage to be formed between the oil supply subsystem and the execution assembly in an electric control or hydraulic control mode; the fault-tolerant control method can realize system redundancy and fault-tolerant control in an electric control or hydraulic control mode, and ensures the braking function of the vehicle.

Description

Line-controlled redundant brake control system of heavy-duty vehicle and fault-tolerant control method thereof
Technical Field
The invention relates to the technical field of vehicle brake operation and control, in particular to a line-control redundant brake operation system of a heavy-duty vehicle and a fault-tolerant control method thereof.
Background
At present, most of brake control systems of heavy-duty vehicles still adopt a mechanical-hydraulic control mode, and hydraulic valves are controlled to output oil pressure through pedals in a mechanical mode, so that the braking force of the vehicles is controlled. The control mode causes the problems of long response time, difficult spatial arrangement and the like of a brake control system, and can not meet the requirements of intelligent and unmanned development of vehicles in the future. The electro-hydraulic brake control system can meet the drive-by-wire control of a vehicle, but on the basis of realizing the drive-by-wire brake control, how to ensure that the vehicle still has an effective brake control function when parts such as an electromagnetic valve, an oil pump and the like in the system break down is a problem to be solved urgently in the field.
Disclosure of Invention
In view of the above, the invention provides a heavy-duty vehicle brake-by-wire redundant control system and a fault-tolerant control method thereof, so that the system has a fault-tolerant control function while meeting the brake-by-wire control function, can ensure the normal operation of the vehicle brake control system under the condition that a certain branch fails, and improve the reliability of the heavy-duty vehicle brake control system; when parts such as a partial pump, a valve and the like in the system have faults, the fault-tolerant control method can realize system redundancy and fault-tolerant control in an electric control or hydraulic control mode, and the braking function of a vehicle is ensured.
The technical scheme of the invention is as follows: a heavy-duty vehicle redundant brake-by-wire operating system comprising: the oil supply subsystem, the control valve group and the execution assembly are sequentially connected through a hydraulic oil circuit; wherein the control valve group comprises: more than two proportional solenoid valves and redundant control components; the execution component includes: more than two brake cylinders; the output oil port of the oil supply subsystem is simultaneously connected with more than two proportional electromagnetic valves, and the more than two proportional electromagnetic valves are respectively connected with more than two brake cylinders through redundant control components; the redundant control assembly enables more than one passage to be formed between the oil supply subsystem and the execution assembly in an electric control or hydraulic control mode.
Preferably, the control valve group comprises: two proportional solenoid valves, corresponding to it, the execution assembly includes: two brake cylinders.
Preferably, the redundant control assembly comprises: the outlet of each proportional electromagnetic valve is connected with the inlet of the normally closed electromagnetic switch valve through a hydraulic oil path, and the outlets of the two normally closed electromagnetic switch valves are connected with the normally open electromagnetic switch valve through hydraulic oil paths; meanwhile, the outlets of the two normally closed electromagnetic switch valves are respectively connected with a brake oil cylinder through a hydraulic oil path, and a brake oil cylinder pressure sensor is arranged on the hydraulic oil path between each normally closed electromagnetic switch valve and the corresponding brake oil cylinder.
Preferably, the redundant control assembly is a hydraulic control logic valve, outlets of the two proportional solenoid valves are respectively connected with input oil ports of the hydraulic control logic valve through hydraulic oil paths, and output oil ports of the hydraulic control logic valve are respectively connected with the two brake cylinders through the hydraulic oil paths.
Preferably, the oil supply subsystem is composed of more than one oil supply module, and an output oil port of the oil supply module is connected with an input oil port of the control valve group.
Preferably, each of the oil supply modules includes: a brake oil pump, an energy accumulator and an overflow valve;
each brake oil pump is driven by a motor, an inlet of each brake oil pump is connected with a system oil tank, and an outlet of each brake oil pump is connected with an inlet of a proportional solenoid valve through a hydraulic oil way; an overflow valve, an oil supply pressure sensor and an energy accumulator are sequentially arranged on a hydraulic oil path between the outlet of each brake oil pump and the inlet of the proportional solenoid valve;
wherein, the outlet of each overflow valve is connected with the system oil tank; each overflow valve is used as a safety valve and is responsible for adjusting the oil supply pressure of the corresponding oil supply module; the accumulator is capable of storing a set volume of pressurized oil.
Preferably, when the oil supply pressure of each branch oil supply pressure sensor is less than a set value, the accumulator is replenished with oil.
Preferably, when the vehicle needs to be in a braking state under the condition that the operating system is completely powered off, a spring inside the brake oil cylinder is positioned at one side, extending out of the brake oil cylinder; when the vehicle needs to be in a brake release state under the condition that the operating system is completely powered off, the spring inside the brake oil cylinder is positioned at one side of the brake oil cylinder in a retracting mode.
A fault-tolerant control method of a line-control redundant brake control system of a heavy-duty vehicle comprises the following steps:
the method comprises the following steps: after the vehicle is electrified, acquiring a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal through an external brake controller;
step two: if the oil supply pressure is lower than the set pressure of the operating system, the brake oil pump starts to work to charge the operating system with oil;
step three: when the brake pedal is stepped on, the brake controller outputs control current of the proportional electromagnetic valve of the corresponding branch according to the relation between the preset brake pedal rotation angle and the pressure of the brake cylinder, so that the pressure of the brake cylinder of each branch is controlled reversely;
step four: the brake controller judges whether the operation of the brake controller is normal or not according to the brake cylinder pressure signals of each branch, if the pressure of the brake cylinder of a certain branch is lower than the target oil pressure, the branch is considered to be invalid, a normally open electromagnetic switch valve is switched on through the brake controller, a normally closed electromagnetic switch valve on the invalid side is switched off, pressure compensation is carried out on the branch, oil is supplied to two brake cylinders in an electric control mode, and the fault-tolerant control function is achieved.
A fault-tolerant control method of a line-control redundant brake control system of a heavy-duty vehicle comprises the following steps:
the method comprises the following steps: after the vehicle is electrified, acquiring a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal through an external brake controller;
step two: if the oil supply pressure is lower than the set pressure of the operating system, the brake oil pump starts to work to charge the operating system with oil;
step three: when the brake pedal is stepped on, the brake controller outputs control current of the proportional electromagnetic valve of the corresponding branch according to the relation between the preset brake pedal rotation angle and the pressure of the brake cylinder, so that the pressure of the brake cylinder of each branch is controlled reversely;
step four: when the output oil pressures of the two proportional solenoid valves are consistent, the valve core of the hydraulic control logic valve is positioned at the middle position, and the output ends of the two proportional solenoid valves supply oil for the two brake cylinders together through the output oil ports of the hydraulic control logic valve; when the output oil pressure of one proportional solenoid valve is lower than that of the other proportional solenoid valve, the valve core moves to the lower side of the oil pressure, the connection between the output oil port of the proportional solenoid valve on the lower side of the oil pressure and the inlet of the brake oil cylinder is cut off, and the proportional solenoid valve on the higher side of the oil pressure supplies oil to the two brake oil cylinders simultaneously, so that hydraulic control redundancy control is realized.
Has the advantages that:
1. the redundant brake control system of heavy-duty vehicle drive-by-wire provided by the invention has more than two mutually redundant brake control branches, the more than one brake control branches are communicated in an electric control or hydraulic control mode through the redundant control assembly, and the reliability of the system can be improved on the basis of realizing the drive-by-wire control of the vehicle brake system.
2. The redundant brake control system for the heavy-duty vehicle by wire provided by the invention realizes redundant electric control between two brake control branches through two normally closed electromagnetic switch valves and one normally open electromagnetic switch valve, and ensures that more than one path of passage is formed between an oil supply subsystem and a brake oil cylinder in the brake control system.
3. The redundant brake control system of the heavy-duty vehicle line control provided by the invention realizes redundant liquid control between two brake control branches through the liquid control logic valve, and ensures that more than one passage is formed between an oil supply subsystem and a brake cylinder in the brake control system.
4. The invention provides a fault-tolerant control method of a line-controlled redundant brake operating system of a heavy-duty vehicle, which is characterized in that an external brake controller is used for acquiring a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal of each branch in real time to judge whether each branch of the brake operating system is in a normal working state or not, and when a certain branch is abnormal, the fault-tolerant control of the operating system is realized by controlling a normally open electromagnetic switch valve and a normally closed electromagnetic switch valve.
5. The invention provides another fault-tolerant control method of a line-control redundant brake control system of a heavy-duty vehicle, which is characterized in that a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal of each branch are acquired in real time through an external brake controller, and whether each branch of the brake control system is in a normal working state or not is judged; the hydraulic control logic valve is used for balancing the oil pressure between the two branches in real time, and when the pressure of one branch is too low, the branch with normal pressure supplies oil to the braking oil cylinder in the system; the control method can also realize the fault-tolerant control of the vehicle brake-by-wire control system, and meet the development requirements of high-reliability, unmanned and intelligent vehicles.
Drawings
Fig. 1 is a schematic diagram of a first brake actuation system provided by the present invention.
Fig. 2 is a schematic diagram of a second brake actuation system provided by the present invention.
FIG. 3 is a schematic diagram of a third brake actuation system provided by the present invention.
Fig. 4 is a schematic diagram of the connection between the brake control system and the control system according to the present invention.
Fig. 5 is a control schematic diagram of the brake operating system provided by the present invention.
The brake system comprises a brake oil pump 1, a proportional electromagnetic valve 2, a brake oil cylinder 3, an energy accumulator 4, an overflow valve 5, a normally open electromagnetic switch valve 6, a normally closed electromagnetic switch valve 7, a hydraulic control logic valve 8, brake oil cylinder pressure sensors S1 and S2, and oil supply pressure sensors S3 and S4.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example 1:
the embodiment provides a heavy-duty vehicle drive-by-wire redundant brake control system, which enables the system to have a fault-tolerant control function while meeting the drive-by-wire brake control function, can ensure the normal operation of the vehicle brake control system under the condition that a certain branch fails, and improves the reliability of the heavy-duty vehicle brake control system.
The brake operating system includes: the oil supply subsystem, the control valve group and the execution assembly are sequentially connected through a hydraulic oil circuit; the output oil port of the control valve group is connected with the input oil port of the execution assembly;
in this embodiment, as shown in fig. 1, the oil supply subsystem is composed of two oil supply modules, each oil supply module includes: the brake oil pump 1, the energy accumulator 4 and the overflow valve 5; the control valve group consists of two control modules and a normally open electromagnetic switch valve 6, and each control module consists of a proportional electromagnetic valve 2 and a normally closed electromagnetic switch valve 7; the execution component comprises: two brake cylinders 3;
each brake oil pump 1 is driven by a motor, the inlet of each brake oil pump 1 is connected with a system oil tank, and the outlet of each brake oil pump 1 is connected with the inlet of a proportional solenoid valve 2 through a hydraulic oil path; an overflow valve 5 (the inlet of the overflow valve 5 is connected to the hydraulic oil path), an oil supply pressure sensor (S3 or S4) and an energy accumulator 4 are sequentially arranged on the hydraulic oil path between the outlet of each brake oil pump 1 and the inlet of the proportional solenoid valve 2; an outlet of each proportional electromagnetic valve 2 is connected with an inlet of a normally closed electromagnetic switch valve 7 through a hydraulic oil path, outlets of two normally closed electromagnetic switch valves 7 are connected with a normally open electromagnetic switch valve 6 through a hydraulic oil path, outlets of two normally closed electromagnetic switch valves 7 are connected with one brake cylinder 3 through a hydraulic oil path, and a brake cylinder pressure sensor (S1 or S2) is arranged on the hydraulic oil path between each normally closed electromagnetic switch valve 7 and the corresponding brake cylinder 3;
wherein, the outlet of each overflow valve 5 is connected with a system oil tank; each overflow valve 5 is used as a safety valve and is responsible for adjusting the oil supply pressure of the corresponding oil supply module; the energy accumulator 4 can store pressure oil with a set volume, and the circuit can still perform set braking operation after the brake oil pump 1 stops working; the proportional solenoid valve 2 is responsible for adjusting the pressure of the brake oil cylinder 3 according to the instruction of the control system; the normally open electromagnetic switch valve 6 and the normally closed electromagnetic switch valve 7 are responsible for communicating a certain loop with other loops in an electric control mode when the loop in the brake operation system has a fault, so that the fault-tolerant control function is realized, the pressure regulating function among different loops is realized, and the braking force distribution among axles or wheels is realized; the executing assembly can determine the position and the rigidity of a spring in each brake oil cylinder 3 according to the requirement that the brake operating system needs to be in a braking state or a releasing state under the condition of no oil pressure, and when the vehicle needs to be in the braking state under the working condition of complete power failure of the operating system, the spring is positioned at one side, from which the brake oil cylinder 3 extends out, of the vehicle; when the vehicle needs to be in a brake release state under the condition that the operating system is completely powered off, the spring is positioned at one side for retracting the brake oil cylinder 3;
in the embodiment, two distributed oil supply subsystems are adopted for supplying oil, when the operating system works normally, the normally open electromagnetic switch valve 6 and the normally closed electromagnetic switch valve 7 are not electrified, and the pressure of the two brake cylinders 3 is directly controlled by the two proportional electromagnetic valves 2; when the oil pressure of one of the brake cylinders 3 is abnormal, the normally closed electromagnetic switch valve 7 of the branch is electrified and disconnected, the normally open electromagnetic switch valve 6 is electrified and closed, and the branch with normal pressure in the operating system supplies oil to the two brake cylinders 3 at the same time.
Example 2:
different from the embodiment 1, in the embodiment, as shown in fig. 2, the oil supply subsystem is composed of an oil supply module which supplies oil to two control modules and two brake cylinders 3 controlled by the two control modules at the same time;
when the operating system works normally, the normally open electromagnetic switch valve 6 and the normally closed electromagnetic switch valve 7 are not electrified, and the pressure of the two brake cylinders 3 is directly controlled by the two proportional electromagnetic valves 2; when the pressure of one of the brake cylinders 3 is abnormal, the normally closed electromagnetic switch valve 7 of the branch is electrified and disconnected, the normally open electromagnetic switch valve 6 is electrified and closed, and the branch with normal pressure in the operating system (the pressure is normal within a set threshold value) supplies oil to the two brake cylinders 3 at the same time.
Example 3:
different from the embodiment 2, in this embodiment, as shown in fig. 3, outlets of two proportional solenoid valves 2 in the control valve group are respectively connected to input oil ports of a hydraulic control logic valve 8 through hydraulic oil paths (that is, the hydraulic control logic valve 8 replaces a normally open electromagnetic switch valve 6 and a normally closed electromagnetic switch valve 7, sensitive chambers at two ends of the hydraulic control logic valve 8 are respectively connected to the two input oil ports thereof, a valve core of the hydraulic control logic valve 8 can move to the side with lower pressure according to the action of hydraulic pressure, so as to disconnect the input oil port on the side with lower pressure from the output oil port, and the input oil port on the side with higher pressure is communicated with the output oil port); the output oil port of the hydraulic control logic valve 8 is respectively connected with the two brake cylinders 3 through hydraulic oil paths; when a loop in the brake operating system has a fault, the hydraulic control logic valve 8 is used for communicating the loop with other loops in a hydraulic control mode to realize a fault-tolerant control function;
it should be noted that in this embodiment, the pressures of the two brake cylinders 3 are always the same;
in the embodiment, one path of oil supply subsystem is adopted for supplying oil, when the output oil pressures of the two branch path proportional solenoid valves 2 are consistent, the outlets of the two branch path proportional solenoid valves 2 are simultaneously communicated with the input oil ports of the execution oil cylinders 3, the brake oil pump 1 simultaneously supplies oil to the two brake oil cylinders 3 through the two proportional solenoid valves 2, and when the output oil pressures of the two branch path proportional solenoid valves 2 are inconsistent, the valve core of the hydraulic control logic valve 8 moves towards the direction of the branch path with low oil pressure, so that the output oil ports of the hydraulic control logic valve 8 are only communicated with the outlet of the proportional solenoid valve 2 on the side with higher oil pressure, and the function of fault-tolerant control is achieved.
The form of the steering system is not limited to the embodiments provided by the above three embodiments, and also includes various numbers of brake steering branches and arrangement positions of the brake steering branches on the whole vehicle, such as independent wheels/tracks or independent axles or staggered left-front/right-rear distribution, and the like.
Example 4:
on the basis of the embodiment 1 and the embodiment 2, the embodiment provides the fault-tolerant control method of the line-control redundant brake control system of the heavy-duty vehicle, when parts such as a partial pump, a valve and the like in the system have faults, the method can realize system redundancy and fault-tolerant control in an electric control mode, and the brake function of the vehicle is ensured.
As shown in fig. 4 and 5, the fault-tolerant control method includes the following steps:
the method comprises the following steps: after the vehicle is electrified, acquiring a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal through an external brake controller;
step two: if the oil supply pressure is lower than the set pressure of the operating system, the brake oil pump 1 starts to work to charge the operating system with oil;
step three: when the brake pedal is stepped on, the brake controller outputs the control current of the proportional solenoid valve 2 of the corresponding branch according to the relation between the preset brake pedal rotation angle and the pressure of the brake cylinder, so as to reversely control the pressure of the brake cylinder 3 of each branch;
step four: the brake controller judges whether the work is normal or not according to the pressure signals of the brake cylinders of the branches;
step five: if the pressure of the brake cylinder of a certain branch is lower than the target oil pressure, the branch is considered to be failed, the normally open electromagnetic switch valve 6 is switched on through the brake controller, the normally closed electromagnetic switch valve 7 on the failed side is switched off, pressure compensation is carried out on the branch, oil is supplied to the two brake cylinders 3 in an electric control mode, and the fault-tolerant control function is achieved.
In this embodiment, according to the signal of each branch oil supply pressure sensor that detects, judge whether need for energy storage 4 mend oil, when needs mend oil, the starter motor pump mends oil for energy storage 4, and the system oil pressure satisfies the demand.
Example 5:
on the basis of embodiment 3, the embodiment provides a fault-tolerant control method for a heavy-duty vehicle line-control redundant brake control system, and when parts such as a partial pump and a valve in the system have faults, the method can realize system redundancy and fault-tolerant control in a hydraulic control mode, so that the braking function of the vehicle is ensured.
The fault-tolerant control method comprises the following steps:
the method comprises the following steps: after the vehicle is electrified, acquiring a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal through an external brake controller;
step two: if the oil supply pressure is lower than the set pressure of the operating system, the brake oil pump 1 starts to work to charge the operating system with oil;
step three: when the brake pedal is stepped on, the brake controller outputs the control current of the proportional solenoid valve 2 of the corresponding branch according to the relation between the preset brake pedal rotation angle and the pressure of the brake cylinder, so as to reversely control the pressure of the brake cylinder 3 of each branch;
step four: the control system realizes hydraulic control fault-tolerant control through the hydraulic control logic valve 8, the output ends of the proportional electromagnetic valves 2 in the two branches are connected with the two input oil ports and the sensitive cavities at the two ends of the hydraulic control logic valve 8, when the two branches work normally, the output oil pressures of the two proportional electromagnetic valves 2 are consistent, the valve cores of the hydraulic control logic valve 8 are positioned in the middle position, and the output ends of the two proportional electromagnetic valves 2 supply oil for the two brake cylinders 3 together through the output oil ports of the hydraulic control logic valve 8; when the output oil pressure of one proportional solenoid valve 2 is lower than that of the other proportional solenoid valve, the valve core moves to the side with lower oil pressure due to the force balance relationship, the connection between the output oil port of the proportional solenoid valve 2 with lower oil pressure and the inlet of the brake oil cylinder 3 is cut off, the proportional solenoid valve 2 with higher pressure simultaneously supplies oil for the two brake oil cylinders 3, and therefore hydraulic control redundancy control under the condition that a certain branch in the control system breaks down is achieved.
And if the pressure signals of the brake cylinders and the oil supply pressure signals of the two branches indicate that the two branches simultaneously fail, sending failure warning signals of the brake control system to the whole vehicle controller and the vehicle control panel.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A heavy-duty vehicle redundant brake-by-wire operating system, comprising: the oil supply subsystem, the control valve group and the execution assembly are sequentially connected through a hydraulic oil circuit; wherein the control valve group comprises: more than two proportional solenoid valves (2) and a redundant control assembly; the execution component includes: more than two brake cylinders (3); the oil outlet of the oil supply subsystem is simultaneously connected with more than two proportional electromagnetic valves (2), and the more than two proportional electromagnetic valves (2) are respectively connected with more than two brake cylinders (3) through redundant control components; the redundant control assembly enables more than one passage to be formed between the oil supply subsystem and the execution assembly in an electric control or hydraulic control mode.
2. The heavy-duty vehicle redundant brake-by-wire actuation system of claim 1, wherein said control valve block comprises: two proportional solenoid valves (2), corresponding to which the actuator assembly comprises: two brake cylinders (3).
3. The heavy-duty vehicle redundant brake-by-wire operating system of claim 2, wherein said redundant control assembly comprises: the proportional electromagnetic valve comprises a normally open electromagnetic switch valve (6) and normally closed electromagnetic switch valves (7), wherein the outlet of each proportional electromagnetic valve (2) is connected with the inlet of each normally closed electromagnetic switch valve (7) through a hydraulic oil path, and the outlets of the two normally closed electromagnetic switch valves (7) are connected with the normally open electromagnetic switch valve (6) through hydraulic oil paths; meanwhile, the outlets of the two normally closed electromagnetic switch valves (7) are respectively connected with one brake oil cylinder (3) through a hydraulic oil circuit, and a brake oil cylinder pressure sensor is arranged on a hydraulic oil circuit between each normally closed electromagnetic switch valve (7) and the corresponding brake oil cylinder (3).
4. The heavy-duty vehicle brake-by-wire redundant brake operating system according to claim 2, wherein the redundant control component is a hydraulic control logic valve (8), outlets of the two proportional solenoid valves (2) are respectively connected with an input oil port of the hydraulic control logic valve (8) through hydraulic oil paths, and an output oil port of the hydraulic control logic valve (8) is respectively connected with the two brake cylinders (3) through hydraulic oil paths.
5. The heavy-duty vehicle brake-by-wire redundant control system according to any one of claims 1-4, wherein said oil supply subsystem is comprised of more than one oil supply module, and an output port of said oil supply module is connected to an input port of a control valve set.
6. The heavy-duty vehicle redundant brake-by-wire operating system of claim 5, wherein each said oil supply module comprises: the brake oil pump (1), the energy accumulator (4) and the overflow valve (5);
each brake oil pump (1) is driven by a motor, the inlet of each brake oil pump (1) is connected with a system oil tank, and the outlet of each brake oil pump is connected with the inlet of the proportional solenoid valve (2) through a hydraulic oil way; an overflow valve (5), an oil supply pressure sensor and an energy accumulator (4) are sequentially arranged on a hydraulic oil path between the outlet of each brake oil pump (1) and the inlet of the proportional solenoid valve (2);
wherein the outlet of each overflow valve (5) is connected with a system oil tank; each overflow valve (5) is used as a safety valve and is responsible for adjusting the oil supply pressure of the corresponding oil supply module; the accumulator (4) is capable of storing a set volume of pressurized oil.
7. The heavy-duty vehicle redundant brake-by-wire operating system according to claim 6, wherein the accumulator (4) is replenished with oil when the oil supply pressure of each branch oil supply pressure sensor is less than a set value.
8. The heavy-duty vehicle by-wire redundant brake-and-operate system according to any one of claims 1-4 and 6-7, wherein when the vehicle is required to be in a braking state under a completely power-off condition of the operate system, the spring inside the brake cylinder (3) is positioned to extend the brake cylinder (3); when the vehicle needs to be in a brake release state under the condition that the operating system is completely powered off, the spring inside the brake oil cylinder (3) is positioned at one side for retracting the brake oil cylinder (3).
9. A fault-tolerant control method of a heavy-duty vehicle redundant brake-by-wire operating system, characterized in that it uses the operating system of claim 3, comprising the steps of:
the method comprises the following steps: after the vehicle is electrified, acquiring a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal through an external brake controller;
step two: if the oil supply pressure is lower than the set pressure of the operating system, the brake oil pump (1) starts to work to charge the operating system with oil;
step three: when the brake pedal is stepped on, the brake controller outputs the control current of the proportional solenoid valve (2) of the corresponding branch according to the relation between the preset brake pedal rotation angle and the pressure of the brake cylinder, so that the pressure of the brake cylinder (3) of each branch is reversely controlled;
step four: the brake controller judges whether the operation of the brake controller is normal or not according to the brake cylinder pressure signals of each branch, if the pressure of the brake cylinder of a certain branch is lower than the target oil pressure, the branch is considered to be invalid, a normally open electromagnetic switch valve (6) is switched on through the brake controller, a normally closed electromagnetic switch valve (7) on the invalid side is switched off, pressure compensation is carried out on the branch, oil is supplied to the two brake cylinders (3) in an electric control mode, and the fault-tolerant control function is achieved.
10. A fault-tolerant control method of a heavy-duty vehicle redundant brake-by-wire operating system, characterized in that it uses the operating system of claim 4, comprising the steps of:
the method comprises the following steps: after the vehicle is electrified, acquiring a brake pedal corner signal, an oil supply pressure signal and a brake cylinder pressure signal through an external brake controller;
step two: if the oil supply pressure is lower than the set pressure of the operating system, the brake oil pump (1) starts to work to charge the operating system with oil;
step three: when the brake pedal is stepped on, the brake controller outputs the control current of the proportional solenoid valve (2) of the corresponding branch according to the relation between the preset brake pedal rotation angle and the pressure of the brake cylinder, so that the pressure of the brake cylinder (3) of each branch is reversely controlled;
step four: when the output oil pressures of the two proportional solenoid valves (2) are consistent, the valve core of the hydraulic control logic valve (8) is positioned at the middle position, and the output ends of the two proportional solenoid valves (2) supply oil for the two brake oil cylinders (3) together through the output oil ports of the hydraulic control logic valve (8); when the output oil pressure of one proportional solenoid valve (2) is lower than that of the other proportional solenoid valve, the valve core moves to the lower side of the oil pressure, the connection between the output oil port of the proportional solenoid valve (2) on the lower side of the oil pressure and the inlet of the brake oil cylinder (3) is cut off, and the proportional solenoid valve (2) on the higher side of the oil pressure supplies oil to the two brake oil cylinders (3) simultaneously, so that hydraulic control redundancy control is realized.
CN202110850641.6A 2021-07-27 2021-07-27 Line-controlled redundant brake control system of heavy-duty vehicle and fault-tolerant control method thereof Active CN113561953B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160023644A1 (en) * 2013-02-27 2016-01-28 Continental Teves Ag & Co. Ohg Brake System for Motor Vehicles
CN111322328A (en) * 2020-03-16 2020-06-23 中国北方车辆研究所 Pump control cylinder hydraulic system for brake system actuation control
CN112188976A (en) * 2018-05-24 2021-01-05 大陆-特韦斯贸易合伙股份公司及两合公司 Brake system with two pressure sources and method for operating the same
CN112572380A (en) * 2019-09-30 2021-03-30 华为技术有限公司 Brake system for a motor vehicle, motor vehicle and method for controlling a brake system
CN112572381A (en) * 2019-09-30 2021-03-30 华为技术有限公司 Distributed braking system of automobile, automobile and control method of automobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160023644A1 (en) * 2013-02-27 2016-01-28 Continental Teves Ag & Co. Ohg Brake System for Motor Vehicles
CN112188976A (en) * 2018-05-24 2021-01-05 大陆-特韦斯贸易合伙股份公司及两合公司 Brake system with two pressure sources and method for operating the same
CN112572380A (en) * 2019-09-30 2021-03-30 华为技术有限公司 Brake system for a motor vehicle, motor vehicle and method for controlling a brake system
CN112572381A (en) * 2019-09-30 2021-03-30 华为技术有限公司 Distributed braking system of automobile, automobile and control method of automobile
CN111322328A (en) * 2020-03-16 2020-06-23 中国北方车辆研究所 Pump control cylinder hydraulic system for brake system actuation control

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