CN115352423B - Pressure control and fault detection system and method for accumulator of electronic hydraulic brake system - Google Patents
Pressure control and fault detection system and method for accumulator of electronic hydraulic brake system Download PDFInfo
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- CN115352423B CN115352423B CN202211000127.4A CN202211000127A CN115352423B CN 115352423 B CN115352423 B CN 115352423B CN 202211000127 A CN202211000127 A CN 202211000127A CN 115352423 B CN115352423 B CN 115352423B
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a system and a method for controlling the pressure of an accumulator of an electronic hydraulic braking system and detecting faults, wherein the system comprises a motor, a hydraulic pump, a first liquid storage tank, a safety valve, a first pressure sensor, a main accumulator, a second pressure sensor, an auxiliary accumulator, a two-position two-way normally open electromagnetic valve, a third pressure sensor, a two-position two-way normally closed electromagnetic valve, a one-way valve, a booster and master cylinder assembly, a second liquid storage tank, a third liquid storage tank, a first pipeline, a pressure relief pipeline, a first branch line, a second pipeline, a control module and a limp-home mode change-over switch; the method includes both modes before engine start and while the vehicle is running. Before and during the starting process of the engine, the invention builds and detects the pressure of the accumulator by the electronic hydraulic brake system, thereby ensuring the pressure of the accumulator required by braking and ensuring the running safety of the whole vehicle; and the pressure building modes of different modes are selected by reading the pressure value of the energy accumulator.
Description
Technical Field
The invention belongs to the technical field of braking systems, and particularly relates to a system and a method for controlling the pressure and detecting faults of an accumulator of an electronic hydraulic braking system.
Background
The braking system is used as an important system for ensuring the running safety of the whole vehicle, the reliability of functions and performances of the braking system has important significance for the running safety, various traffic accidents are often caused by the reduction of the braking performance or the loss of the functions, and the life and property safety of drivers and other road traffic participants can be endangered. The assistance modes of the hydraulic braking at the present stage include vacuum assistance, hydraulic assistance and the like, and the hydraulic assistance also includes mechanical hydraulic assistance, electronic hydraulic assistance and the like. One of the technical routes of the electronic hydraulic braking system is to directly pressurize the brake fluid through a motor, and store the pressurized brake fluid in a high-pressure accumulator as a power-assisted energy source during braking. The electronic hydraulic braking system is used as an electromechanical system, and the pressure building and fault detection strategies of the energy accumulator are of great significance.
Disclosure of Invention
In response to the above-identified deficiencies or improvements in the art, the present invention provides a system and method for pressure build-up and fault detection of an accumulator. And selecting the pressure building modes of different modes by reading the pressure value of the energy accumulator.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
an electro-hydraulic brake system accumulator pressure control and fault detection system comprising:
the hydraulic pump, a first liquid storage tank, a safety valve, a first pressure sensor, a main energy accumulator, a second pressure sensor, a secondary energy accumulator, a two-position two-way normally-open electromagnetic valve, a third pressure sensor, a two-position two-way normally-closed electromagnetic valve, a one-way valve, a booster and a master cylinder component, a second liquid storage tank, a third liquid storage tank, a first pipeline, a pressure relief pipeline, a first branch line, a second pipeline, a control module and a limp-home mode switch, wherein the booster and the master cylinder component comprise a master cylinder and a booster cavity;
the motor drives a hydraulic pump, and brake fluid in a first liquid storage tank is pumped into a main accumulator and an auxiliary accumulator for storage through a first pipeline, a first branch line and a second branch line; a first branch line at the bottom of the main energy accumulator is provided with a first pressure sensor and a second pressure sensor, and a second branch line at the bottom of the auxiliary energy accumulator is provided with a third pressure sensor; a first branch line at the bottom of the main energy accumulator is provided with a two-position two-way normally open electromagnetic valve, and a second branch line at the bottom of the auxiliary energy accumulator is provided with a two-position two-way normally closed electromagnetic valve; a one-way valve is arranged between the hydraulic pump and the main accumulator; the liquid inlet and the pipeline connection of helping hand chamber of booster and master cylinder subassembly, the liquid return mouth in helping hand chamber is connected with the liquid storage pot through No. two pipelines, and booster and master cylinder subassembly's master cylinder is connected with No. two liquid storage pot, no. three liquid storage pot and No. one braking return circuit and No. two braking return circuits respectively through four pipelines, is equipped with the relief valve between hydraulic pump's export and the No. one liquid storage pot, can prevent pressure overload when electrical system breaks down.
Further, when the motor operates, high-pressure brake fluid enters the main accumulator and is also communicated with the booster and the booster cavity of the main cylinder; when the two-position two-way normally closed electromagnetic valve is electrified, brake fluid can enter and exit the auxiliary accumulator;
under normal conditions, the two-position two-way normally open electromagnetic valve is not electrified, the main energy accumulator is communicated with the first pipeline, and when the main energy accumulator fails, the two-position two-way normally open electromagnetic valve is electrified, and the main energy accumulator is not communicated with the first pipeline; under normal conditions, the auxiliary energy accumulator is not communicated with the first pipeline, and when the auxiliary energy accumulator builds pressure or needs to work, the two-position two-way normally-closed electromagnetic valve is electrified, and the auxiliary energy accumulator is communicated with the first pipeline;
when the pressures of the main accumulator and the auxiliary accumulator reach the set upper limit value, the motor stops working, and meanwhile, the two-position two-way normally closed electromagnetic valve is powered off, and only the main accumulator is communicated with the booster and the booster cavity of the main cylinder; when the motor, the hydraulic pump or the main accumulator fails, the electromagnetic valve is electrified, and brake fluid in the auxiliary accumulator enters the booster and the booster cavity of the main cylinder.
The method for controlling the pressure of the accumulator of the electronic hydraulic brake system and detecting the faults comprises the following steps:
step one: after the whole vehicle is electrified, the electronic hydraulic power-assisted control system is electrified for self-checking, and if the electronic hydraulic braking system has self-checking faults, an alarm signal is sent to an instrument; if no self-checking fault exists, entering a step two;
step two: reading brake fluid level alarm information, and if the brake fluid level is too low, entering a step eleven; if the liquid level is not too low, alarming, and entering a step III;
reading the rotation speed and the vehicle speed of the engine, judging the states of the engine and the whole vehicle, if the engine is not started, the whole vehicle is in a static state, entering a step four, and if the engine is in the non-static state, turning to a vehicle running process;
step four, 2 pressure sensors of the main energy accumulator are read, if the numerical value difference of the 2 pressure sensors is larger than a set value, the first pressure sensor or the second pressure sensor of the main energy accumulator is judged to be faulty, and step eleven is entered; if the numerical value difference of the 2 pressure sensors is not greater than the set value, entering a step five;
step five: judging the pressure value of the main energy accumulator, if the pressure value of the main energy accumulator is not lower than the set lower limit, continuously judging the auxiliary energy accumulator, if one of the pressure values of the main energy accumulator and the auxiliary energy accumulator is lower than the set lower limit, judging that the pressure is too low, sending a too low alarm signal to an instrument, entering the step six, if the pressure values of the main energy accumulator and the auxiliary energy accumulator are not lower than the set lower limit, judging whether the whole vehicle is in a braking state, and entering the step eight;
step six: if the fault of too low pressure exists, the state of the ignition switch is read, and the ignition switch is at the IGN position, waiting for and continuously monitoring an ignition switch signal; if the ignition switch is not at the IGN position, the starter does not work, and the engine speed is continuously read; starting a motor to build pressure at a low rotation speed when the rotation speed of the engine is less than 100 RPM; starting a motor to build up pressure at a high rotating speed when the rotating speed of the engine is not less than 100 RPM;
step seven: judging whether the main energy accumulator and the auxiliary energy accumulator can normally build pressure or not; performing a motor-up and parking braking action;
step eight: when the whole vehicle is braked, the leakage detection of the accumulator is not carried out, when the braking is not carried out, the pressure drop of the main accumulator and the auxiliary accumulator is detected, if the pressure drop of the main accumulator or the auxiliary accumulator is larger than a set value, the leakage of the accumulator exists, the stopping braking is forbidden to be released, the limiting rotating speed of the engine is required to be lower than idle speed plus 200RPM, and the limiting torque is lower than 20% of the maximum output torque;
step nine: if the pressure of the main energy accumulator is too low, the pressure of the auxiliary energy accumulator is too low and the pressure building system fails, the system is set to be in a serious failure mode, starting is not allowed when the system fails seriously, and an alarm of serious failure is sent to the instrument;
step ten: if the first pressure sensor or the second pressure sensor of the main energy accumulator fails and the auxiliary energy accumulator fails or the auxiliary energy accumulator sensor fails at the same time, the system enters an intermittent pressure building mode and a limp mode;
step eleven: prohibiting release of the parking brake, requesting engine limit speed and torque;
step twelve: if no fault exists in the electronic hydraulic brake system, the normal pressure building mode is entered;
step thirteen: if any fault exists in the electronic hydraulic braking system, an alarm signal is sent to an instrument, meanwhile, a signal for requesting limiting the rotating speed and limiting the torque is sent to an engine, and if the whole vehicle is provided with an EPB, the system sends a signal for releasing the limitation parking braking to the EPB.
Further, the method in the seventh step is as follows:
step 7.1: if the main accumulator can normally build pressure, continuing to judge the pressure of the auxiliary accumulator;
step 7.1.1: if the pressure of the auxiliary energy accumulator can be normally built, stopping the piezoelectric building motor when the pressures of the main energy accumulator and the auxiliary energy accumulator reach the set upper limit;
step 7.1.2: if the pressure of the auxiliary energy accumulator cannot be normally established, judging that the auxiliary energy accumulator fails or the pressure sensor of the auxiliary energy accumulator fails, and entering a step eleven;
step 7.2: if the pressure of the main accumulator can not be normally established, the pressure of the auxiliary accumulator can be normally established, judging that the main accumulator fails or the first pressure sensor or the second pressure sensor of the main accumulator fails, and entering a step eleventh;
step 7.3: if the pressure of the main accumulator and the auxiliary accumulator cannot be normally built, judging that the pressure building system is faulty, and entering a step eleventh.
Furthermore, after the limp switch is pressed, the parking can be released and the limp mode is entered when no serious fault exists;
in thirteen steps, all faults send relevant fault alarm signals to the instrument.
Further, in the intermittent pressure building mode in the step ten, the pressure building system works for building pressure with a set time length, and in order to prevent the system from continuously working all the time, the pressure building system continues to work for the set time length after stopping the set time length, and thus the intermittent work is performed in a reciprocating mode.
Further, the specific requirements for requesting engine limit speed and torque in step eleven are engine limit speed below idle +200RPM and limit torque below 20% of maximum output torque.
Further, in the third step, the standard for judging the starting of the engine is: and if the engine speed is less than 100RPM and the vehicle speed is less than 3km/h, judging that the engine is not started.
Further, the step of the normal pressure build-up mode in the step twelve is as follows:
reading the rotation speed of an engine, and starting a motor to build up pressure at a low rotation speed when the rotation speed of the engine is less than 100 RPM; starting a motor to build pressure at a high rotating speed when the rotating speed of the engine is greater than 100RPM, if the pressures of the main energy accumulator and the auxiliary energy accumulator can be built normally, stopping the operation of the piezoelectric building motor after the pressures of the main energy accumulator and the auxiliary energy accumulator reach the set upper limit, and if the pressures of the main energy accumulator and the auxiliary energy accumulator can not be built normally, entering a step seven to carry out fault judgment; and when the pressure of the main energy accumulator or the auxiliary energy accumulator is lower than the set lower limit, reading the rotating speed of the engine, and circulating.
The control and fault detection method during the running of the automobile comprises the following steps:
step one: reading engine speed and vehicle speed information, and judging the states of the engine and the whole vehicle, if the engine speed is greater than 100RPM and the vehicle speed is greater than 3km/h, judging that the whole vehicle is in operation, and entering a step two; otherwise, entering a process before starting the engine;
step two: reading fault information of a brake system, and entering a limp mode if a fault exists; if no fault exists, entering a step three;
step three: reading brake fluid level alarm information, and entering a limp-home mode if the brake fluid level alarm information is low; if the liquid level is not too low, alarming, and entering a step four;
step four: reading pressure information of the energy accumulator, if the difference value between the readings of the first pressure sensor and the second pressure sensor of the main energy accumulator is larger than a set value, judging that the first pressure sensor or the second pressure sensor of the main energy accumulator fails, and entering a limp-home mode; otherwise, entering a fifth step;
step five: if the smaller value of the first pressure sensor reading and the second pressure sensor reading of the main accumulator is lower than the set value, judging that the pressure of the main accumulator is too low, and entering a step seven; otherwise, entering a step six;
step six: if the pressure sensor value of the auxiliary energy accumulator is lower than the set value, judging that the pressure of the auxiliary energy accumulator is too low, and entering a step seven;
step seven: starting the motor to build up pressure at a high rotating speed, and entering a step eight;
step eight: judging the pressure value of the main accumulator, and if the lower value of the pressure value of the main accumulator is higher than the set upper limit, entering a step nine; otherwise, entering a step ten;
step nine: judging the pressure value of the auxiliary energy accumulator, and if the pressure value of the auxiliary energy accumulator is higher than the set upper limit, entering a pressure building control flow; otherwise, judging that the auxiliary accumulator fails or the auxiliary accumulator pressure sensor fails, and entering a limp mode;
step ten: judging the pressure value of the auxiliary energy accumulator, if the pressure value of the auxiliary energy accumulator rises to be higher than the set upper limit, judging that the main energy accumulator is in fault or the first pressure sensor or the second pressure sensor of the main energy accumulator is in fault, and entering a limp-home mode;
step eleven: if the main accumulator fails or the first pressure sensor or the second pressure sensor of the main accumulator fails, and the auxiliary accumulator fails or the auxiliary accumulator pressure sensor fails, determining that the values of all the pressure sensors are not reliable, and entering an intermittent pressure building mode;
step twelve: if the pressure of the main accumulator is too low, the pressure of the auxiliary accumulator is too low and the pressure building system is failed, the main accumulator is set to be a serious failure;
step thirteen: during braking, the leakage detection of the energy accumulator is not carried out; when the braking is not performed, if the pressure drop of the auxiliary energy accumulator is larger than a set value, the auxiliary energy accumulator is leaked, and then a limp-home mode is entered;
step fourteen: if no fault exists, entering a normal pressure building mode;
fifteen steps: if a serious fault exists, the forward direction sends a serious fault alarm to the instrument.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
1. before and during the starting process of the engine, the invention builds and detects the pressure of the accumulator by the electronic hydraulic brake system, thereby ensuring the pressure of the accumulator required by braking and ensuring the running safety of the whole vehicle;
2. the invention selects the pressure building modes of different modes by reading the pressure value of the energy accumulator.
Drawings
FIG. 1 is a schematic diagram of the accumulator pressure control and fault detection system of the electro-hydraulic brake system of the present invention;
FIG. 2 is a flow chart of a method of accumulator pressure control and fault detection for an electro-hydraulic brake system prior to engine start in accordance with the present invention;
FIG. 3 is a flow chart of the method of accumulator pressure control and fault detection for an electro-hydraulic brake system during operation of an automobile in accordance with the present invention;
like reference numerals denote like technical features throughout the drawings, in particular: the hydraulic system comprises a 1-motor, a 2-hydraulic pump, a 3-first liquid storage tank, a 4-safety valve, a 5-first pressure sensor, a 6-main energy accumulator, a 7-second pressure sensor, an 8-auxiliary energy accumulator, a 9-two-position two-way normally open electromagnetic valve, a 10-third pressure sensor, a 11-two-position two-way normally closed electromagnetic valve, a 12-one-way valve, a 13-booster and a master cylinder assembly, a 13-1 master cylinder, a 13-2 booster cavity, a 14-second liquid storage tank, a 15-third liquid storage tank, a 16-first pipeline, a 17-pressure relief pipeline, a 18-first branch line, a 19-second branch line and a 20-second pipeline.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, an embodiment of the present invention provides an accumulator pressure control and fault detection system of an electro-hydraulic brake system, including:
the hydraulic pump comprises a motor 1, a hydraulic pump 2, a first liquid storage tank 3, a safety valve 4, a first pressure sensor 5, a main energy accumulator 6, a second pressure sensor 7, a secondary energy accumulator 8, a two-position two-way normally open electromagnetic valve 9, a third pressure sensor 10, a two-position two-way normally closed electromagnetic valve 11, a one-way valve 12, a booster and master cylinder assembly 13, a second liquid storage tank 14, a third liquid storage tank 15, a first pipeline 16, a pressure relief pipeline 17, a first branch line 18, a second branch line 19, a second pipeline 20, a control module and a limp-home mode switch, wherein the booster and master cylinder assembly 13 comprises a master cylinder 13-1 and a booster cavity 13-2;
the motor 1 drives the hydraulic pump 2, and the brake fluid in the first fluid storage tank 3 is pumped into the main accumulator 6 and the auxiliary accumulator 8 for storage through the first pipeline 16, the first branch line 18 and the second branch line 19; a first branch line 18 at the bottom of the main energy accumulator 6 is provided with a first pressure sensor 5 and a second pressure sensor 7, and a second branch line 19 at the bottom of the auxiliary energy accumulator 8 is provided with a third pressure sensor 9; a first branch line at the bottom of the main energy accumulator 6 is provided with a two-position two-way normally open electromagnetic valve 9, and a second branch line at the bottom of the auxiliary energy accumulator 8 is provided with a two-position two-way normally closed electromagnetic valve 11; a one-way valve 12 is arranged between the hydraulic pump 2 and the main accumulator 6; the liquid inlet of a booster cavity 13-2 of a booster and master cylinder 13 assembly is connected with a first pipeline 16, the liquid return port of the booster cavity 13-2 is connected with a liquid storage tank 3 through a second pipeline 20, the master cylinder 13-1 of the booster and master cylinder assembly is respectively connected with a second liquid storage tank 14, a third liquid storage tank 15, a first brake loop and a second brake loop through four pipelines, a safety valve 4 is arranged between the outlet of the hydraulic pump 2 and the first liquid storage tank 3, and pressure overload can be prevented when an electric control system fails.
When the motor 1 runs, high-pressure brake fluid enters the main accumulator 6 and is also communicated with the booster and a booster cavity of the main cylinder 13; when the two-position two-way normally closed electromagnetic valve 11 is electrified, brake fluid can enter and exit the auxiliary accumulator 8; under normal conditions, when the two-position two-way normally open electromagnetic valve 9 is not electrified, the main accumulator 6 is communicated with the first pipeline 16, and when the main accumulator 6 fails, the two-position two-way normally open electromagnetic valve 9 is electrified, and the main accumulator 6 is not communicated with the first pipeline 16; normally, the auxiliary energy accumulator 8 is not communicated with the first pipeline 16, and when the auxiliary energy accumulator 8 builds pressure or needs the auxiliary energy accumulator 8 to work, the two-position two-way normally closed electromagnetic valve 11 is electrified, and the auxiliary energy accumulator 8 is communicated with the first pipeline 16;
when the pressures of the main accumulator 6 and the auxiliary accumulator 8 reach the set upper limit value, the motor 1 stops working, and meanwhile, the two-position two-way normally closed electromagnetic valve 11 is powered off, and only the main accumulator 6 is communicated with the booster cavity of the booster and the main cylinder 13; when the motor 1, the hydraulic pump 2 or the main accumulator 6 fails, the electromagnetic valve 11 is electrified, and the brake fluid in the auxiliary accumulator 8 enters the booster and the booster cavity of the main cylinder 12.
Referring to fig. 2, an embodiment of the present invention provides a method for controlling accumulator pressure and detecting faults of an electro-hydraulic brake system, the method for controlling the accumulator pressure and detecting faults before starting an engine includes the following steps:
s100: and (3) self-checking of the whole vehicle and judging the vehicle state: after the whole vehicle is electrified, the electronic hydraulic power-assisted control system is electrified for self-checking, and if the electronic hydraulic braking system has self-checking faults, an alarm signal is sent to an instrument; if no self-checking fault exists, reading brake fluid level alarm information; if the liquid level is too low, the parking brake is forbidden to be released, the engine is requested to limit the rotating speed to be below idle speed plus 200RPM and the limiting torque is below 20% of the maximum output torque; if the alarm of the too low liquid level does not exist, reading the rotation speed and the vehicle speed of the engine, wherein the rotation speed of the engine is less than 100RPM and the vehicle speed is less than 3km/h, judging that the engine is not started, if the engine is started, turning to a vehicle operation flow, if the engine is not started, the whole vehicle is in a static state, and entering a pressure building flow;
s200: the pressure building flow comprises the following steps: reading a first pressure sensor 5 and a second pressure sensor 7 of the main accumulator 6, if the numerical difference of the 2 pressure sensors is larger than a set value, judging that the first pressure sensor 5 or the second pressure sensor 7 of the main accumulator is failed, prohibiting the release of the parking brake, requesting the engine to limit the rotating speed to be less than idle speed plus 200RPM and limiting the torque to be less than 20% of the maximum output torque; if the difference of the values of the 2 pressure sensors is not larger than a set value, judging the pressure value of the main energy accumulator 6, if the pressure value of the main energy accumulator 6 is not lower than a set lower limit, continuously judging the auxiliary energy accumulator 8, if one of the pressure values of the main energy accumulator 6 and the auxiliary energy accumulator 8 is lower than the set lower limit, judging that the pressure is too low, and sending a pressure too low alarm signal to an instrument;
s201: if the pressure values of the main accumulator and the auxiliary accumulator are not lower than the set lower limit, judging whether the whole vehicle is in a braking state or not, and entering a leakage detection flow;
s202: if the fault of too low pressure exists, the state of the ignition switch is read, and the ignition switch is at the IGN position, waiting for and continuously monitoring an ignition switch signal; if the ignition switch is not at the IGN position, the starter does not work, and the engine speed is continuously read; starting a motor to build pressure at a low rotation speed when the rotation speed of the engine is required to be less than 100 RPM; starting a motor to build up pressure at a high rotating speed when the rotating speed of the engine is not less than 100 RPM;
s300: the fault detection flow comprises the following steps: judging whether the main energy accumulator 6 and the auxiliary energy accumulator 8 can normally build pressure or not;
s301: if the main energy accumulator 6 and the auxiliary energy accumulator 8 can normally build pressure, the piezoelectric motor is built to stop working after the pressures of the main energy accumulator 6 and the auxiliary energy accumulator 8 reach the set upper limit;
s302: if the main accumulator 6 can build pressure normally, the auxiliary accumulator 8 cannot build pressure normally, judging that the auxiliary accumulator 8 or the auxiliary accumulator pressure sensor 10 is out of order, prohibiting the release of the parking brake, requesting the engine to limit the rotating speed to be less than idle speed plus 200RPM and limiting the torque to be less than 20% of the maximum output torque;
s303: if the main accumulator 6 cannot normally build pressure, the auxiliary accumulator 8 can normally build pressure, and the main accumulator 6 or the first pressure sensor 5 or the second pressure sensor 7 of the main accumulator are judged to be in failure, the parking brake is forbidden to be released, the rotation speed of the engine is limited to be less than idle speed plus 200RPM, and the limiting torque is less than 20% of the maximum output torque;
s304: if the pressures of the main accumulator 6 and the auxiliary accumulator 8 cannot be normally built, judging that a built-up system is faulty, prohibiting the release of the parking brake, requesting the engine to limit the rotating speed to be less than idle +200RPM and limiting the torque to be less than 20% of the maximum output torque;
s400: the leakage detection flow comprises the following steps: when the whole vehicle brakes, the leakage detection of the energy accumulator is not carried out; when the braking is not performed, detecting the pressure drop of the main accumulator 6 and the auxiliary accumulator 8, if the pressure drop of the main accumulator 6 or the auxiliary accumulator 8 is larger than a set value, if the accumulator has leakage, prohibiting the release of the parking braking, requesting the engine to limit the rotating speed to be less than idling +200RPM and the limiting torque to be less than 20% of the maximum output torque;
in the above steps, if the pressure of the main accumulator 6 is too low and the pressure of the auxiliary accumulator 8 is too low and the pressure building system fails at the same time, the system is set to be in a serious failure mode, starting is not allowed when the system fails seriously, and a serious failure alarm is sent to an instrument;
in the above steps, if the first pressure sensor 5 or the second pressure sensor 7 of the main accumulator fails and the auxiliary accumulator 8 or the auxiliary accumulator sensor 10 fails at the same time, the system enters an intermittent pressure build-up mode and a limp mode, and in the intermittent pressure build-up mode, the pressure build-up system works for a set period of time to build pressure, so as to prevent the system from continuously working all the time, and then stops for a set period of time and then continues to work for a set period of time to build pressure, so that intermittent work is performed reciprocally;
in the step, if the electronic hydraulic braking system does not have any fault, entering a normal pressure building mode;
in the steps, if any fault exists in the electronic hydraulic braking system, sending an alarm signal to an instrument and sending a signal for requesting to limit the rotating speed and limiting the torque to an engine, and if the whole vehicle is provided with an EPB, sending a signal for releasing the parking braking to the EPB by the system, and sending related fault alarm signals to the instrument by all faults;
in the above steps, after the limp switch is pressed in the fault mode, when no serious fault exists, parking can be released, and the limp mode is entered;
the normal pressure build-up mode is as follows:
reading the rotation speed of an engine, and starting a motor to build up pressure at a low rotation speed when the rotation speed of the engine is less than 100 RPM; starting a motor to build pressure at a high rotating speed when the rotating speed of the engine is greater than 100RPM, if the pressures of the main energy accumulator 6 and the auxiliary energy accumulator 8 can be built normally, stopping the operation of the piezoelectric motor when the pressures of the main energy accumulator 6 and the auxiliary energy accumulator 8 reach the set upper limit, and if the pressures of the main energy accumulator 6 and the auxiliary energy accumulator 8 can not be built normally, entering a step seven to perform fault judgment; when the pressure of the main accumulator 6 or the auxiliary accumulator 8 is lower than the set lower limit, the engine speed is read and circulation is carried out.
Referring to fig. 3, an embodiment of the present invention provides a method for controlling pressure and detecting faults of an accumulator of an electro-hydraulic brake system, the method for controlling pressure and detecting faults when an automobile is running includes the following steps:
s100: judging the state of the vehicle: reading information of the engine speed and the vehicle speed, and judging the states of the engine and the whole vehicle, wherein if the engine speed is greater than 100RPM and the vehicle speed is greater than 3km/h, the whole vehicle is judged to be in operation; if the vehicle does not run, entering a pre-engine starting process, if the whole vehicle runs, reading fault information of a braking system, and if the fault exists, entering a limp-home mode; if no fault exists, reading brake fluid level alarm information, and if the alarm of the too low fluid level exists, entering a limp-home mode; if the liquid level is not too low, alarming, and entering a pressure building process;
s200: the pressure building flow comprises the following steps: reading pressure information of the energy accumulator, if the difference value between the reading of the first pressure sensor 5 and the reading of the second pressure sensor 7 of the main energy accumulator is larger than a set value, judging that the first pressure sensor 5 or the second pressure sensor 7 of the main energy accumulator is faulty, and entering a limp-home mode; and if the difference value is smaller than the set value, judging the reading of the pressure sensor:
if the smaller value of the first pressure sensor reading 5 and the second pressure sensor reading 7 of the main energy accumulator is lower than the set value, judging that the pressure of the main energy accumulator 6 is too low, starting the motor to build pressure at a high rotating speed, and judging the pressure values of the main energy accumulator 6 and the auxiliary energy accumulator 8;
if the smaller value of the first pressure sensor reading 5 and the second pressure sensor reading 7 of the main energy accumulator is higher than the set value, judging the value of the pressure sensor 10 of the auxiliary energy accumulator, if the value of the pressure sensor 10 of the auxiliary energy accumulator is lower than the set value, judging that the pressure of the auxiliary energy accumulator 8 is too low, starting the motor to build pressure at a high rotating speed, and judging the pressure values of the main energy accumulator 6 and the auxiliary energy accumulator 8;
s201: judging the pressure value of the main accumulator 6, judging the pressure value of the auxiliary accumulator 8 if the lower value of the pressure value of the main accumulator 6 is higher than the set upper limit, and entering a pressure building control flow if the pressure value of the auxiliary accumulator 8 is higher than the set upper limit; otherwise, judging that the auxiliary accumulator fails 8 or the auxiliary accumulator pressure sensor 10 fails, and entering a limp mode;
s202: if the lower value of the pressure value of the main accumulator 6 is not increased to be higher than the set upper limit, judging the pressure value of the auxiliary accumulator 8, if the pressure value of the auxiliary accumulator 8 is increased to be higher than the set upper limit, judging that the main accumulator 6 is in fault or the first pressure sensor 5 or the second pressure sensor 7 of the main accumulator is in fault, and entering a limp mode;
s300: and (3) fault treatment:
s301: if the main accumulator 6 or the first pressure sensor 5 or the second pressure sensor 7 of the main accumulator are in failure, and the auxiliary accumulator 8 or the auxiliary accumulator pressure sensor 10 are in failure, the values of all the pressure sensors are not credible, and an intermittent pressure building mode is entered;
s302: if the pressure of the main energy accumulator 6 is too low, the pressure of the auxiliary energy accumulator 8 is too low and the pressure building system is failed, the system is set to be seriously failed;
s400, leakage detection flow:
when the vehicle brakes, the leakage detection of the energy accumulator is not carried out; when the braking is not performed, if the pressure drop of the auxiliary energy accumulator is larger than a set value, the auxiliary energy accumulator is leaked, and then a limp-home mode is entered;
in the step, if no fault exists, a normal pressure building mode is entered;
in the above steps, if a serious fault exists, the forward instrument sends a serious fault alarm.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The method for controlling the pressure and detecting the faults of the accumulator of the electronic hydraulic braking system is characterized by comprising the following steps of:
step one: after the whole vehicle is electrified, the electronic hydraulic power-assisted control system is electrified for self-checking, and if the electronic hydraulic braking system has self-checking faults, an alarm signal is sent to an instrument; if no self-checking fault exists, entering a step two;
step two: reading brake fluid level alarm information, and if the brake fluid level is too low, entering a step eleven; if the liquid level is not too low, alarming, and entering a step III;
reading the rotation speed and the vehicle speed of the engine, judging the states of the engine and the whole vehicle, if the engine is not started, the whole vehicle is in a static state, entering a step four, and if the engine is in the non-static state, turning to a vehicle running process;
step four, 2 pressure sensors of the main energy accumulator are read, if the numerical value difference of the 2 pressure sensors is larger than a set value, the first pressure sensor or the second pressure sensor of the main energy accumulator is judged to be faulty, and step eleven is entered; if the numerical value difference of the 2 pressure sensors is not greater than the set value, entering a step five;
step five: judging the pressure value of the main energy accumulator, if the pressure value of the main energy accumulator is not lower than the set lower limit, continuously judging the auxiliary energy accumulator, if one of the pressure values of the main energy accumulator and the auxiliary energy accumulator is lower than the set lower limit, judging that the pressure is too low, sending a too low alarm signal to an instrument, entering the step six, if the pressure values of the main energy accumulator and the auxiliary energy accumulator are not lower than the set lower limit, judging whether the whole vehicle is in a braking state, and entering the step eight;
step six: if the fault of too low pressure exists, the state of the ignition switch is read, and the ignition switch is at the IGN position, waiting for and continuously monitoring an ignition switch signal; if the ignition switch is not at the IGN position, the starter does not work, and the engine speed is continuously read; starting a motor to build pressure at a low rotation speed when the rotation speed of the engine is less than 100 RPM; starting a motor to build up pressure at a high rotating speed when the rotating speed of the engine is not less than 100 RPM;
step seven: judging whether the main energy accumulator and the auxiliary energy accumulator can normally build pressure or not; performing a motor-up and parking braking action;
step eight: when the whole vehicle is braked, the leakage detection of the accumulator is not carried out, when the braking is not carried out, the pressure drop of the main accumulator and the auxiliary accumulator is detected, if the pressure drop of the main accumulator or the auxiliary accumulator is larger than a set value, the leakage of the accumulator exists, the stopping braking is forbidden to be released, the limiting rotating speed of the engine is required to be lower than idle speed plus 200RPM, and the limiting torque is lower than 20% of the maximum output torque;
step nine: if the pressure of the main energy accumulator is too low, the pressure of the auxiliary energy accumulator is too low and the pressure building system fails, the system is set to be in a serious failure mode, starting is not allowed when the system fails seriously, and an alarm of serious failure is sent to the instrument;
step ten: if the first pressure sensor or the second pressure sensor of the main energy accumulator fails and the auxiliary energy accumulator fails or the auxiliary energy accumulator sensor fails at the same time, the system enters an intermittent pressure building mode and a limp mode;
step eleven: prohibiting release of the parking brake, requesting engine limit speed and torque;
step twelve: if no fault exists in the electronic hydraulic brake system, the normal pressure building mode is entered;
step thirteen: if any fault exists in the electronic hydraulic braking system, an alarm signal is sent to an instrument, meanwhile, a signal for requesting limiting the rotating speed and limiting the torque is sent to an engine, and if the whole vehicle is provided with an EPB, the system sends a signal for releasing the limitation parking braking to the EPB.
2. The method for controlling the pressure and detecting faults of an accumulator of an electro-hydraulic brake system according to claim 1, wherein the method comprises the following steps: the method in the seventh step is as follows:
step 7.1: if the main accumulator can normally build pressure, continuing to judge the pressure of the auxiliary accumulator;
step 7.1.1: if the pressure of the auxiliary energy accumulator can be normally built, stopping the piezoelectric building motor when the pressures of the main energy accumulator and the auxiliary energy accumulator reach the set upper limit;
step 7.1.2: if the pressure of the auxiliary energy accumulator cannot be normally established, judging that the auxiliary energy accumulator fails or the pressure sensor of the auxiliary energy accumulator fails, and entering a step eleven;
step 7.2: if the pressure of the main accumulator can not be normally established, the pressure of the auxiliary accumulator can be normally established, judging that the main accumulator fails or the first pressure sensor or the second pressure sensor of the main accumulator fails, and entering a step eleventh;
step 7.3: if the pressure of the main accumulator and the auxiliary accumulator cannot be normally built, judging that the pressure building system is faulty, and entering a step eleventh.
3. The method for controlling the pressure and detecting faults of an accumulator of an electro-hydraulic brake system according to claim 1, wherein the method comprises the following steps:
step eight and step eleven, after the limp switch is pressed, when no serious fault exists, parking can be released, and a limp mode is entered;
in thirteen steps, all faults send relevant fault alarm signals to the instrument.
4. The method for controlling the pressure and detecting faults of an accumulator of an electro-hydraulic brake system according to claim 1, wherein the method comprises the following steps: in the step ten, under the intermittent pressure building mode, the pressure building system works for building pressure with set time length, and in order to prevent the system from continuously working all the time, the system stops for the set time length and then continues to work for building pressure with the set time length, and the system works intermittently in a reciprocating manner.
5. The method for controlling the pressure and detecting faults of an accumulator of an electro-hydraulic brake system according to claim 1, wherein the method comprises the following steps: specific requirements for requesting engine speed and torque in step eleven are engine speed limit below idle +200RPM and torque limit below 20% of maximum output torque.
6. The method for controlling the pressure and detecting faults of an accumulator of an electro-hydraulic brake system according to claim 1, wherein the method comprises the following steps: in the third step, the starting standard of the engine is judged as follows: and if the engine speed is less than 100RPM and the vehicle speed is less than 3km/h, judging that the engine is not started.
7. The method for controlling the pressure and detecting faults of an accumulator of an electro-hydraulic brake system according to claim 1, wherein the method comprises the following steps: the normal pressure build-up mode in step twelve is as follows:
reading the rotation speed of an engine, and starting a motor to build up pressure at a low rotation speed when the rotation speed of the engine is less than 100 RPM; starting a motor to build pressure at a high rotating speed when the rotating speed of the engine is greater than 100RPM, if the pressures of the main energy accumulator and the auxiliary energy accumulator can be built normally, stopping the operation of the piezoelectric building motor after the pressures of the main energy accumulator and the auxiliary energy accumulator reach the set upper limit, and if the pressures of the main energy accumulator and the auxiliary energy accumulator can not be built normally, entering a step seven to carry out fault judgment; and when the pressure of the main energy accumulator or the auxiliary energy accumulator is lower than the set lower limit, reading the rotating speed of the engine, and circulating.
8. The method for controlling the pressure and detecting the faults of the accumulator of the electronic hydraulic braking system is characterized by comprising the following steps of:
step one: reading engine speed and vehicle speed information, and judging the states of the engine and the whole vehicle, if the engine speed is greater than 100RPM and the vehicle speed is greater than 3km/h, judging that the whole vehicle is in operation, and entering a step two; otherwise, entering a process before starting the engine;
step two: reading fault information of a brake system, and entering a limp mode if a fault exists; if no fault exists, entering a step three;
step three: reading brake fluid level alarm information, and entering a limp-home mode if the brake fluid level alarm information is low; if the liquid level is not too low, alarming, and entering a step four;
step four: reading pressure information of the energy accumulator, if the difference value between the readings of the first pressure sensor and the second pressure sensor of the main energy accumulator is larger than a set value, judging that the first pressure sensor or the second pressure sensor of the main energy accumulator fails, and entering a limp-home mode; otherwise, entering a fifth step;
step five: if the smaller value of the first pressure sensor reading and the second pressure sensor reading of the main accumulator is lower than the set value, judging that the pressure of the main accumulator is too low, and entering a step seven; otherwise, entering a step six;
step six: if the pressure sensor value of the auxiliary energy accumulator is lower than the set value, judging that the pressure of the auxiliary energy accumulator is too low, and entering a step seven;
step seven: starting the motor to build up pressure at a high rotating speed, and entering a step eight;
step eight: judging the pressure value of the main accumulator, and if the lower value of the pressure value of the main accumulator is higher than the set upper limit, entering a step nine; otherwise, entering a step ten;
step nine: judging the pressure value of the auxiliary energy accumulator, and if the pressure value of the auxiliary energy accumulator is higher than the set upper limit, entering a pressure building control flow; otherwise, judging that the auxiliary accumulator fails or the auxiliary accumulator pressure sensor fails, and entering a limp mode;
step ten: judging the pressure value of the auxiliary energy accumulator, if the pressure value of the auxiliary energy accumulator rises to be higher than the set upper limit, judging that the main energy accumulator is in fault or the first pressure sensor or the second pressure sensor of the main energy accumulator is in fault, and entering a limp-home mode;
step eleven: if the main accumulator fails or the first pressure sensor or the second pressure sensor of the main accumulator fails, and the auxiliary accumulator fails or the auxiliary accumulator pressure sensor fails, determining that the values of all the pressure sensors are not reliable, and entering an intermittent pressure building mode;
step twelve: if the pressure of the main accumulator is too low, the pressure of the auxiliary accumulator is too low and the pressure building system is failed, the main accumulator is set to be a serious failure;
step thirteen: during braking, the leakage detection of the energy accumulator is not carried out; when the braking is not performed, if the pressure drop of the auxiliary energy accumulator is larger than a set value, the auxiliary energy accumulator is leaked, and then a limp-home mode is entered;
step fourteen: if no fault exists, entering a normal pressure building mode;
fifteen steps: if a serious fault exists, the forward direction sends a serious fault alarm to the instrument.
9. An electro-hydraulic brake system accumulator pressure control and fault detection system, for implementing the method of any one of claims 1-8, comprising:
the hydraulic pump, a first liquid storage tank, a safety valve, a first pressure sensor, a main energy accumulator, a second pressure sensor, a secondary energy accumulator, a two-position two-way normally-open electromagnetic valve, a third pressure sensor, a two-position two-way normally-closed electromagnetic valve, a one-way valve, a booster and a master cylinder component, a second liquid storage tank, a third liquid storage tank, a first pipeline, a pressure relief pipeline, a first branch line, a second pipeline, a control module and a limp-home mode switch, wherein the booster and the master cylinder component comprise a master cylinder and a booster cavity;
the motor drives a hydraulic pump, and brake fluid in a first liquid storage tank is pumped into a main accumulator and an auxiliary accumulator for storage through a first pipeline, a first branch line and a second branch line; a first branch line at the bottom of the main energy accumulator is provided with a first pressure sensor and a second pressure sensor, and a second branch line at the bottom of the auxiliary energy accumulator is provided with a third pressure sensor; a first branch line at the bottom of the main energy accumulator is provided with a two-position two-way normally open electromagnetic valve, and a second branch line at the bottom of the auxiliary energy accumulator is provided with a two-position two-way normally closed electromagnetic valve; a one-way valve is arranged between the hydraulic pump and the main accumulator; the liquid inlet and the pipeline connection of helping hand chamber of booster and master cylinder subassembly, the liquid return mouth in helping hand chamber is connected with the liquid storage pot through No. two pipelines, and booster and master cylinder subassembly's master cylinder is connected with No. two liquid storage pot, no. three liquid storage pot and No. one braking return circuit and No. two braking return circuits respectively through four pipelines, is equipped with the relief valve between hydraulic pump's export and the No. one liquid storage pot, can prevent pressure overload when electrical system breaks down.
10. The electro-hydraulic brake system accumulator pressure control and fault detection system of claim 9 wherein: when the motor operates, high-pressure brake fluid enters the main accumulator and is also communicated with the booster and the booster cavity of the main cylinder; when the two-position two-way normally closed electromagnetic valve is electrified, brake fluid can enter and exit the auxiliary accumulator;
under normal conditions, when the two-position two-way normally open electromagnetic valve is not electrified, the main energy accumulator is communicated with the first pipeline, when the main energy accumulator fails, the two-position two-way normally open electromagnetic valve is electrified, and the main energy accumulator is not communicated with the first pipeline; under normal conditions, the auxiliary energy accumulator is not communicated with the first pipeline, and when the auxiliary energy accumulator builds pressure or needs to work, the two-position two-way normally-closed electromagnetic valve is electrified, and the auxiliary energy accumulator is communicated with the first pipeline;
when the pressures of the main accumulator and the auxiliary accumulator reach the set upper limit value, the motor stops working, and meanwhile, the two-position two-way normally closed electromagnetic valve is powered off, and only the main accumulator is communicated with the booster and the booster cavity of the main cylinder; when the motor, the hydraulic pump or the main accumulator fails, the electromagnetic valve is electrified, and brake fluid in the auxiliary accumulator enters the booster and the booster cavity of the main cylinder.
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| CN109455174B (en) * | 2018-12-22 | 2023-10-13 | 吉林大学 | Wire control hydraulic braking system adopting high-pressure accumulator and braking control method thereof |
| CN112744202B (en) * | 2019-10-31 | 2022-05-13 | 比亚迪股份有限公司 | Electro-hydraulic braking system, method applied to electro-hydraulic braking system and vehicle |
| CN111348020A (en) * | 2019-11-19 | 2020-06-30 | 瑞立集团瑞安汽车零部件有限公司 | Simple and reliable electronic hydraulic braking system and method and vehicle |
| CN111332266B (en) * | 2020-03-31 | 2024-07-16 | 徐工集团工程机械股份有限公司科技分公司 | Electric control braking hydraulic system and engineering machinery |
| CN111497805A (en) * | 2020-05-28 | 2020-08-07 | 武汉嘉琪新扬科技发展有限公司 | Hydraulic brake system for vehicle and control method thereof |
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| EP0495483A2 (en) * | 1991-01-16 | 1992-07-22 | Honda Giken Kogyo Kabushiki Kaisha | Problem diagnosis system in pressure device control apparatus |
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