CN111348020A - Simple and reliable electronic hydraulic braking system and method and vehicle - Google Patents
Simple and reliable electronic hydraulic braking system and method and vehicle Download PDFInfo
- Publication number
- CN111348020A CN111348020A CN201911132680.1A CN201911132680A CN111348020A CN 111348020 A CN111348020 A CN 111348020A CN 201911132680 A CN201911132680 A CN 201911132680A CN 111348020 A CN111348020 A CN 111348020A
- Authority
- CN
- China
- Prior art keywords
- brake
- normally closed
- power
- electromagnetic valve
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 10
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 claims 2
- 102100034112 Alkyldihydroxyacetonephosphate synthase, peroxisomal Human genes 0.000 claims 1
- 101000799143 Homo sapiens Alkyldihydroxyacetonephosphate synthase, peroxisomal Proteins 0.000 claims 1
- 238000000848 angular dependent Auger electron spectroscopy Methods 0.000 claims 1
- 238000013461 design Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
-
- 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
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
- B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
- B60T8/4081—Systems with stroke simulating devices for driver input
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention relates to a simple and reliable electronic hydraulic braking system, a method and a vehicle, wherein the electronic hydraulic braking system mainly comprises a two-position three-way electromagnetic valve (6), a high-pressure energy accumulator (14), a first normally closed electromagnetic valve (15) and a second normally closed electromagnetic valve (16), a power piston (1) is connected with a pedal, a brake master cylinder (8) is connected with an electronic stability control system ESC (10), a motor (12), a hydraulic pump (11) and the high-pressure energy accumulator (14) provide a boosting high-pressure source for the system, and an electronic control unit ECU is connected with the two-position three-way electromagnetic valve (6), the first normally closed electromagnetic valve (15) and the second normally closed electromagnetic valve (16). The simple, convenient and reliable electronic hydraulic brake system with the assistance provided by the energy accumulator is an electronic hydraulic brake system which gets rid of the traditional vacuum assistance, meets the intelligent driving brake requirement, and has the advantages of stable operation, high reliability, simple vehicle matching, customizable pedals, small volume, convenient arrangement and the like, and is suitable for large-tonnage vehicles.
Description
Technical Field
The invention relates to the technical field of automobile brake systems, in particular to a simple and reliable electronic hydraulic brake system with assistance provided by an energy accumulator, a simple and reliable electronic hydraulic brake control method with assistance provided by the energy accumulator and a vehicle with the simple and reliable electronic hydraulic brake system with assistance provided by the energy accumulator.
Background
With the demand of higher deceleration, more safety functions and environmental protection, vehicles are being electrically driven and intelligentized. Compared with the traditional automobile, more vehicles are driven by motors, no engine provides a vacuum source, and the traditional vacuum power-assisted braking system cannot be used.
The Chinese patent with the publication number of CN109532810A discloses an electronic hydraulic brake system device, which comprises a motor, a shell, a brake main cylinder piston and a planetary gear mechanism, wherein the motor directly drives the planetary gear mechanism to run at a large transmission ratio in a speed reduction mode and increase transmission torque, the planetary gear mechanism comprises a sun gear, a planet carrier gear and a gear ring, the planet carrier pushes the brake main cylinder piston to establish hydraulic brake, a position sensor is arranged to feed back position signals to a motor controller at any time, the motor is controlled to run through an algorithm, the electronic hydraulic brake system device has the characteristic of transmitting large torque by small current, and transmission shafts of the planetary gear mechanism are all in the axis position and run stably.
At present, the requirement of the automobile industry on a wire control electronic braking system is higher and higher, and the development direction mainly comprises two directions of hydraulic assistance and motor assistance. The ultimate goal of development is of course to achieve full mechanical braking without any oil involvement. However, in consideration of the wide application range, safety and the like, the hydraulically-assisted electronic hydraulic brake system EHB has great advantages, and the electronic hydraulic brake system EHB can be the mainstream of the electronic brake-by-wire system for a long time.
At present, various electromechanical servo booster mechanisms ibooster and intelligent brake system eboost products in the market are developed aiming at vehicle types below 3T, the structure is complex, the control logic is complicated, the main cylinder needs to be enlarged to meet the requirements of system displacement and brake pressure for large-tonnage vehicles, the motor needs to be enlarged, electronic components such as MOS (metal oxide semiconductor) tubes, capacitors and inductors need to be enlarged, and the cost is greatly increased; if no adjustment is made, the braking response is slowed, the insufficient displacement can also cause the insufficient safety margin of the system, and the braking effect is poor.
Disclosure of Invention
In view of the above technical problems in the prior art, the present invention provides a simple and reliable electronic hydraulic brake system with assistance provided by an accumulator, a simple and reliable electronic hydraulic brake control method with assistance provided by an accumulator, and a vehicle having the simple and reliable electronic hydraulic brake system with assistance provided by an accumulator.
In order to achieve the above object, the present invention adopts the following technical solutions.
The invention firstly provides a simple and reliable electronic hydraulic brake system, which comprises a power piston, a brake master cylinder, a motor hydraulic pump, an electronic control unit ECU, a two-position three-way electromagnetic valve, an electronic stability control system ESC, a high-pressure energy accumulator, a first normally closed electromagnetic valve and a second normally closed electromagnetic valve; the power piston is connected with a pedal, the brake master cylinder is connected with an electronic stability control system ESC, the motor, the hydraulic pump and the high-pressure accumulator provide a boosting high-pressure source for the system, and the electronic control unit ECU is connected with a two-position three-way electromagnetic valve, a first normally closed electromagnetic valve and a second normally closed electromagnetic valve.
Preferably, the device further comprises a travel sensor, a pedal simulator and a brake.
In any of the above technical solutions, preferably, the pedal simulator is connected to a two-position three-way solenoid valve.
The brake is connected with an electronic stability control system ESC.
In any of the above technical solutions, preferably, the stroke sensor is disposed at the power piston end, and transmits a power piston displacement signal to the electronic control unit ECU.
In any of the above technical solutions, preferably, the brake master cylinder includes a master cylinder first piston, a power assisting chamber and a power chamber.
In any of the above embodiments, preferably, the master cylinder first piston is in contact with the power piston.
In any of the above technical solutions, it is preferable that the assist chamber is provided with a first pressure sensor.
In any of the above technical solutions, preferably, the power chamber is provided with a second pressure sensor.
In any of the above solutions, it is preferable that the high pressure accumulator is provided with a third pressure sensor.
In any of the above technical solutions, preferably, an oil pot is provided at an upper portion of the brake master cylinder.
The invention also provides a simple and reliable electronic hydraulic brake control method for providing assistance by an energy accumulator, and the simple and reliable electronic hydraulic brake system brake control method according to any one of the above items comprises the following steps:
in a pure hydraulic braking mode, when a driver steps on a brake pedal, the pedal drives a power piston to move, at the moment, a stroke sensor senses the displacement of the power piston, a displacement signal is transmitted to an electronic control unit ECU of the system, the ECU judges the driving intention to control a two-position three-way electromagnetic valve to be electrified and communicated with a pedal simulator, a first normally closed electromagnetic valve is electrified and opened, a second normally closed electromagnetic valve is normally closed, high-pressure oil of a high-pressure energy accumulator is input into a power assisting cavity through the first normally closed electromagnetic valve, a first piston of a main cylinder is pushed to move to enable a brake main cylinder to be pressurized into an electronic stability control system ESC, finally the brake obtains required braking force through the regulation of the electronic stability control system ESC, the power piston moves forwards to push brake fluid of the power assisting cavity to enter the pedal simulator through the two-position three-way electromagnetic valve, the pedal simulator provides, at the moment, the power cavity is at medium pressure, the power cavity is at high pressure, and the brake master cylinder is at high pressure;
the brake-by-wire mode is characterized in that an ADAS (Advanced Driving assistance System) System performs emergency braking according to road condition analysis requirements, sends an external braking request to an EHB (electronic hydraulic brake System), under the condition that a driver does not step on a pedal, an ECU (electronic control unit) of the System controls a two-position three-way solenoid valve to be electrified and communicated with a pedal simulator, a first normally closed solenoid valve is electrified and opened, a second normally closed solenoid valve is normally closed, high-pressure oil of a high-pressure energy accumulator is input into an auxiliary force cavity through the first normally closed solenoid valve, a first piston of a main cylinder is pushed to move so that a brake main cylinder is pressurized and enters an electronic stability control System ESC, and finally the brake obtains required braking force through the regulation of the electronic stability control System ESC, wherein the power cavity is normal pressure, the auxiliary force cavity is high pressure, and the brake main cylinder is high;
in an electronic failure mode, the electromagnetic valves are in a normal state, when a driver steps on a brake pedal, the power piston is directly driven to move, so that pressure is built in the power cavity, the pressure enters the power assisting cavity through the two-position three-way electromagnetic valve, the first piston of the main cylinder is further pushed to move, the built pressure of the main brake cylinder is built and enters the electronic stability control system ESC, and finally the brake obtains required braking force through the adjustment of the electronic stability control system ESC, at the moment, the power cavity is at a medium pressure, the power assisting cavity is at a medium pressure, and the main brake cylinder is at the medium pressure;
the method comprises the following steps that (1) a mechanical failure mode and a power assisting cavity are failed, wherein the failure comprises the failure of one or more parts related to power assisting, the power assisting is lost in a braking system at the moment, when a driver steps on a brake pedal, a power piston is directly driven to move, a first piston of a main cylinder can be pushed to move only by eliminating a decoupling gap, the system has no braking before the power piston contacts the first piston of the main cylinder, the first piston of the main cylinder pushes the main braking cylinder to build pressure after the power piston contacts the first piston of the main cylinder, high-pressure brake fluid enters an electronic stability control system ESC, and finally the brake obtains required braking force through the regulation of the ESC, the braking system has no power assisting at the moment, the power cavity is at normal pressure, the power assisting cavity is at normal pressure;
in a pure motor feedback braking mode, an Electronic Control Unit (ECU) of the system controls a two-position three-way electromagnetic valve to be electrified and communicated with a pedal simulator, a first normally closed electromagnetic valve is normally closed, a second normally closed electromagnetic valve is normally closed, a driver steps on a pedal to drive a power piston to move forwards, brake fluid in a power assisting cavity is pushed to enter the pedal simulator through the two-position three-way electromagnetic valve, the pedal simulator provides pedal feedback for the driver at the moment, pedal force and pedal stroke are simulated, braking force is provided by a vehicle driving motor, decoupling gaps can be continuously reduced but do not disappear in the whole braking process, at the moment, a power cavity is under the medium pressure, the power assisting cavity is under the normal pressure, and.
The invention also provides a vehicle comprising a simple and reliable electro-hydraulic brake system as defined in any one of the above.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the electronic hydraulic brake system mainly comprises a power piston, a two-position three-way electromagnetic valve, a brake master cylinder, an electronic stability control system ESC, a hydraulic pump, a motor, an electronic control unit ECU, a high-pressure energy accumulator, a first normally closed electromagnetic valve and a second normally closed electromagnetic valve (16), and is a simple, convenient and reliable electronic hydraulic brake system with assistance provided by the energy accumulator. The invention adopts a high-power motor and multi-pump structure to establish the high pressure of the energy accumulator so as to meet the braking requirement of a large-tonnage vehicle; the reversing valve is used for replacing two electromagnetic valves, the electromagnetic valves as few as possible are used for controlling the on-off of each oil way to realize power assisting and braking, and the structure is simple; providing pedal feedback for a driver through a pedal simulator, and simulating pedal force and stroke; the decoupling design meets the basic requirements of drive-by-wire braking such as energy recovery.
The invention replaces partial mechanical elements with electronic elements on the basis of the traditional hydraulic braking system, controls the oil circuit of the system by using one reversing valve and two normally closed valves, and has simple structure. In addition, the decoupling design enables the brake pedal not to be directly connected with the brake wheel cylinder, the operation of a driver is collected by a sensor to be used as a control intention, the brake operation is completely finished by a hydraulic actuator, and in the brake control process, the pedal simulator provides pedal feedback for the driver to simulate pedal force and stroke. In addition, the decoupling design enables the pedals to be customized, and different pedal feelings can be realized according to the requirements of different vehicle types.
The invention provides a simple, convenient and reliable electronic hydraulic brake system which gets rid of the traditional vacuum assistance, meets the intelligent driving brake requirement, has the advantages of stable operation, high reliability, simple and easy vehicle matching, customizable pedals, small volume, convenient arrangement and the like, and is suitable for large-tonnage vehicles.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a pure hydraulic braking and brake-by-wire control process for the simple and reliable electro-hydraulic brake system shown in FIG. 1;
FIG. 2 is a schematic diagram of an electronic fail brake control process for the simple and reliable electro-hydraulic brake system of FIG. 1;
FIG. 3 is a schematic diagram of a mechanical failure brake control process for the simple and reliable electro-hydraulic brake system of FIG. 1;
fig. 4 is a schematic diagram of a simple and reliable electric-only regenerative braking control process of the electro-hydraulic brake system shown in fig. 1.
Reference numerals: 1. the brake system comprises a power piston, 2, a stroke sensor, 3, a main cylinder first piston, 4, a first pressure sensor, 5, a second pressure sensor, 6, a two-position three-way electromagnetic valve, 7, a pedal simulator, 8, a brake main cylinder, 9, a brake, 10, an electronic stability control system ESC, 11, a hydraulic pump, 12, a motor, 13, a third pressure sensor, 14, a high-pressure energy accumulator, 15, a first normally closed electromagnetic valve, 16, a second normally closed electromagnetic valve, 17, an oil can, 18, a power assisting cavity, 19 and a power cavity.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the technical defects of system safety, braking effect and the like of a large-tonnage vehicle in the prior art, the embodiment of the invention provides a simple, convenient and reliable electronic hydraulic braking system with an energy accumulator for providing assistance, which can get rid of the traditional vacuum assistance and meet the intelligent driving braking requirement, has the advantages of stable operation, high reliability, simple vehicle matching, customizable pedals, small volume, convenient arrangement and the like, and is suitable for the large-tonnage vehicle. The embodiment also provides a brake control method of the electronic hydraulic brake system with the assistance provided by the accumulator, and a large-tonnage vehicle with the electronic hydraulic brake system with the assistance provided by the accumulator.
As shown in fig. 1, the simple and reliable electronic hydraulic brake system according to this embodiment includes a power piston 1, a stroke sensor 2, a two-position three-way electromagnetic valve 6, a pedal simulator 7, a brake master cylinder 8, a brake 9, an electronic stability control system ESC 10, a motor 12, a hydraulic pump 11, a high-pressure accumulator 14, a first normally closed electromagnetic valve 15, a second normally closed electromagnetic valve 16, and an electronic control unit ECU, wherein the power piston 1 is connected to a pedal, the brake master cylinder 8 is connected to the electronic stability control system ESC 10, the motor 12, the hydraulic pump 11, and the high-pressure accumulator 14 provide a boosting high-pressure source for the system, the electronic control unit ECU is connected to the two-position three-way electromagnetic valve 6, the first normally closed electromagnetic valve 15, and the second normally closed electromagnetic valve 16, the pedal simulator 7 is connected to the two-position three-way electromagnetic valve 6, the, the power piston 1 displacement signal is transmitted to the electronic control unit ECU.
In the simple and reliable electronic hydraulic brake system of the present embodiment, as shown in fig. 1, the brake master cylinder 8 includes a master cylinder first piston 3, a boosting cavity 18 and a power cavity 19, the master cylinder first piston 3 contacts with the power piston 1, the boosting cavity 18 is provided with a first pressure sensor 4, and the power cavity 19 is provided with a second pressure sensor 5.
In the simple and reliable electro-hydraulic brake system of the present embodiment, as shown in fig. 1, the high pressure accumulator 14 is provided with a third pressure sensor 13.
In the simple and reliable electro-hydraulic brake system of this embodiment, as shown in fig. 1, an oil pot 17 is provided at an upper portion of the master cylinder 8.
The electronic hydraulic brake system with the structure has the working principle that: the driver steps on the brake pedal, the pedal drives the power piston 1 to move, and before the decoupling gap is not eliminated, the power piston 1 and the first piston 3 of the main cylinder move independently. At the moment, the stroke sensor 2 senses the displacement of the power piston 1, signals are transmitted to the electronic control unit ECU, the electronic control unit ECU controls the on-off of three electromagnetic valves, namely a two-position three-way electromagnetic valve 6, a first normally closed electromagnetic valve 15 and a second normally closed electromagnetic valve 16, high-pressure oil of the high-pressure energy accumulator 14 is input into the power assisting cavity 18, the main cylinder first piston 3 is pushed to move, the brake main cylinder 8 is pressurized and enters the electronic stability control system ESC 10, and finally the brake 9 obtains required braking force through the adjustment of the electronic stability control system ESC 10. The power piston 1 moves forwards to push the brake fluid in the power assisting cavity 19 to enter the pedal simulator 7 through the two-position three-way electromagnetic valve 6. The pedal simulator 7 provides pedal feedback to the driver, simulating pedal force and travel. The high pressure oil of the high pressure accumulator 14 is supplemented by the operation of the motor 12 and the hydraulic pump 11. The oiler 17 is non-pressure brake fluid, and stores and supplements the brake fluid for the system.
The electronic hydraulic brake system with the structure is a simple, convenient and reliable electronic hydraulic brake system with assistance provided by the energy accumulator, and is applied to large-tonnage vehicles, and the high-power motor and multi-pump structure establishes the high pressure of the energy accumulator, so that the braking requirement of the large-tonnage vehicles is met; the reversing valve is used for replacing two electromagnetic valves, the electromagnetic valves as few as possible are used for controlling the on-off of each oil way to realize power assisting and braking, and the structure is simple; providing pedal feedback for a driver through a pedal simulator, and simulating pedal force and stroke; the decoupling design meets the basic requirements of drive-by-wire braking such as energy recovery.
According to the simple and reliable brake control method of the electronic hydraulic brake system, under the normal condition: as shown in fig. 1, the motor 12, the hydraulic pump 11 and the high-pressure accumulator 14 provide a boosting high-pressure source for the system; the two-position three-way electromagnetic valve 6 controls the communication of the power cavity 19 with the pedal simulator 7 and the power-assisted cavity 18; the first normally closed electromagnetic valve 15 controls the on-off of the high-pressure accumulator 14 and the boosting cavity 18 and is responsible for system pressurization boosting; the second normally closed electromagnetic valve 16 controls the system to reduce pressure; the third pressure sensor 13 monitors the pressure of the high pressure accumulator 14; the first pressure sensor 4 monitors the pressure in the power assisting cavity 18; the second pressure sensor 5 monitors the pressure of the power cavity 19; the stroke sensor 2 detects and collects pedal stroke displacement.
The brake control method of the embodiment includes five brake control modes of pure hydraulic brake, brake-by-wire, electronic failure, mechanical failure, and pure electric machine regenerative brake, and the brake control process is specifically described below with reference to fig. 1 to 4.
Pure hydraulic braking: as shown in fig. 1, when a driver steps on a brake pedal, the pedal drives a power piston 1 to move (in this braking mode, a decoupling gap does not exist all the time), at this time, a stroke sensor 2 senses the displacement of the power piston 1, a displacement signal is transmitted to a system electronic control unit ECU, the electronic control unit ECU judges a driving intention to control a two-position three-way solenoid valve 6 to be electrified and communicated with a pedal simulator 7, a first normally closed solenoid valve 15 is electrified and opened, a second normally closed solenoid valve 16 is normally closed, high-pressure oil of a high-pressure energy accumulator 14 is input into an auxiliary force cavity 18 through the first normally closed solenoid valve 15, a master cylinder first piston 3 is pushed to move to enable a brake master cylinder 8 to be pressed into an electronic stability control system ESC 10, finally, the brake 9 obtains a required braking force through the regulation of the electronic stability control system ESC 10, the power piston 1 moves forward to push brake fluid of the auxiliary force cavity 19 to enter the pedal simulator, the pedal simulator 7 provides pedal feedback for a driver to simulate pedal force and stroke, at the moment, the power cavity 19 is at medium pressure, the boosting cavity 18 is at high pressure, and the brake master cylinder 8 is at high pressure.
Brake-by-wire: the ADAS system carries out emergency braking according to the road condition analysis requirement and sends an external braking request to an electronic hydraulic braking system EHB, as shown in figure 1, a vehicle system detects an emergency braking signal, under the condition that a driver does not step on a pedal, a system electronic control unit ECU controls a two-position three-way electromagnetic valve 6 to be electrified and communicated with a pedal simulator 7, a first normally closed electromagnetic valve 15 is electrified and opened, a second normally closed electromagnetic valve 16 is normally closed, high-pressure oil of a high-pressure energy accumulator 14 is input into a power assisting cavity 18 through the first normally closed electromagnetic valve 15, a main cylinder first piston 3 is pushed to move so that a brake main cylinder 8 is pressurized into an electronic stability control system ESC 10, and finally the brake 9 obtains required braking force through the adjustment of the electronic stability control system ESC 10, wherein at the moment, the power cavity 19 is at normal pressure (no pressure), the power assisting cavity 18 is.
Electronic failure: at this time, the electromagnetic valves are all in a normal state, as shown in fig. 2, when a driver steps on a brake pedal, the power piston 1 is directly driven to move, so that the power cavity 19 builds pressure (in this braking mode, a decoupling gap is not eliminated and exists all the time), the decoupling gap enters the power assisting cavity 18 through the two-position three-way electromagnetic valve 6, and then the main cylinder first piston 3 is pushed to move, so that the brake main cylinder 8 builds pressure and enters the electronic stability control system ESC 10, and finally the brake 9 obtains required braking force through the adjustment of the electronic stability control system ESC 10, at this time, the power cavity 19 is at a medium pressure, the power assisting cavity 18 is at a medium pressure, and the brake main cylinder 8 is at.
Mechanical failure: the boost chamber 18 fails, including failure of one or more components associated with the boost, at which point the braking system loses boost. As shown in fig. 3, when the driver steps on the brake pedal, the power piston 1 is directly driven to move, the master cylinder first piston 3 can be pushed to move only by eliminating the decoupling gap, and the system has no brake before the power piston 1 contacts the master cylinder first piston 3. After the power piston 1 contacts the master cylinder first piston 3, the master cylinder first piston 3 pushes the brake master cylinder 8 to build pressure, high-pressure brake fluid enters the electronic stability control system ESC 10, and finally the brake 9 obtains required braking force through the adjustment of the electronic stability control system ESC 10, and at the moment, the brake system has no assistance. At this time, the power chamber 19 is at normal pressure (no pressure), the booster chamber 18 is at normal pressure (no pressure), and the master cylinder 8 is at high pressure.
Pure motor feedback braking: as shown in fig. 4, the ECU controls the two-position three-way solenoid valve 6 to be powered on and communicated with the pedal simulator 7, the first normally closed solenoid valve 15 is normally closed, the second normally closed solenoid valve 16 is normally closed, the driver steps on the pedal to drive the power piston 1 to move forward, the brake fluid pushing the power assisting cavity 19 enters the pedal simulator 7 through the two-position three-way solenoid valve 6, the pedal simulator 7 provides pedal feedback for the driver at the moment, pedal force and pedal stroke are simulated, brake force is provided by a vehicle driving motor, decoupling gaps can be continuously reduced but do not disappear in the whole braking process, at the moment, the power cavity 19 is medium pressure, the power assisting cavity 18 is normal pressure (no pressure), and the brake master cylinder 8 is normal pressure (no pressure).
The electronic hydraulic brake system and the brake control method thereof of the embodiment replace part of mechanical elements with electronic elements on the basis of the traditional hydraulic brake system, control the oil path of the system by using one reversing valve and two normally closed valves, and have simple structure. The decoupling design ensures that the brake pedal is not directly connected with the brake wheel cylinder, the operation of a driver is collected by a sensor as a control intention, the brake operation is completely finished by a hydraulic actuator, and in the brake control process, the pedal simulator provides pedal feedback for the driver to simulate pedal force and stroke. In addition, the decoupling design enables the pedals to be customized, and different pedal feelings can be realized according to the requirements of different vehicle types.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention; the above description is only for the specific embodiment of the present invention, and is not intended to limit the scope of the present invention; any modification, equivalent replacement, improvement and the like of the technical solution of the present invention by a person of ordinary skill in the art without departing from the design spirit of the present invention shall fall within the protection scope determined by the claims of the present invention.
Claims (10)
1. The utility model provides a simple and convenient reliable electronic hydraulic braking system, includes power piston (1), brake master cylinder (8), motor (12), hydraulic pump (11) and electronic control unit ECU, its characterized in that still includes two-position three way solenoid valve (6), electron stability control system ESC (10), high pressure energy storage ware (14), first normally closed solenoid valve (15) and second normally closed solenoid valve (16), the footboard is connected in power piston (1), electronic stability control system ESC (10) is connected in brake master cylinder (8), motor (12), hydraulic pump (11), high pressure energy storage ware (14) provide the helping hand high voltage source for the system, electronic control unit ECU connects two-position three way solenoid valve (6), first normally closed solenoid valve (15) and second normally closed solenoid valve (16).
2. A simple and reliable electro-hydraulic brake system according to claim 1, further comprising a stroke sensor (2), a pedal simulator (7), and a brake (9).
3. A simple and reliable electro-hydraulic brake system according to claim 2, characterized in that the pedal simulator (7) is connected to a two-position three-way solenoid valve (6).
4. A simple and reliable electro-hydraulic brake system according to claim 2, characterized in that the brake (9) is connected to an electronic stability control system ESC (10).
5. A simple and reliable electrohydraulic brake system according to claim 2, characterized in that said stroke sensor (2) is arranged at the power piston (1) end, transmitting the power piston (1) displacement signal to the electronic control unit ECU.
6. Simple and reliable electrohydraulic braking system according to claim 1, characterized in that said master cylinder (8) comprises a master cylinder first piston (3), a power assistance chamber (18) and a power chamber (19).
7. A simple and reliable electro-hydraulic brake system according to claim 6, characterized in that the master cylinder first piston (3) is in contact with the power piston (1).
8. A simple and reliable electro-hydraulic brake system according to claim 6, characterised in that the booster chamber (18) is provided with a first pressure sensor (4).
9. The simple and reliable brake control method of an electro-hydraulic brake system according to any one of claims 1 to 8, characterized by comprising:
in a pure hydraulic braking mode, when a driver steps on a brake pedal, the pedal drives a power piston (1) to move, at the moment, a stroke sensor (2) senses the displacement of the power piston (1), a displacement signal is transmitted to an electronic control unit ECU (electronic control unit), the electronic control unit ECU judges driving intention to control a two-position three-way electromagnetic valve (6) to be electrified and communicated with a pedal simulator (7), a first normally closed electromagnetic valve (15) is electrified and opened, a second normally closed electromagnetic valve (16) is normally closed, high-pressure oil of a high-pressure energy accumulator (14) is input into a power assisting cavity (18) through the first normally closed electromagnetic valve (15), a first piston (3) of a main cylinder is pushed to move to enable a brake main cylinder (8) to be pressurized into an electronic stability control system ESC (10), finally, the brake (9) obtains required braking force through adjustment of the electronic stability control system ESC (10), and the power piston (1) moves forwards to push brake fluid of the power assisting cavity (19) to enter The simulator (7), the pedal simulator (7) provides the pedal feedback for the driver, simulate the pedal force and travel, at this moment, the power cavity (19) is the medium pressure, the booster cavity (18) is the high pressure, the brake master cylinder (8) is the high pressure;
in the brake-by-wire mode, the ADAS system carries out emergency braking according to the road condition analysis requirement and sends an external braking request to the EHB, under the condition that a driver does not step on a pedal, a system Electronic Control Unit (ECU) controls a two-position three-way electromagnetic valve (6) to be electrified and communicated with a pedal simulator (7), a first normally closed electromagnetic valve (15) is electrified and opened, a second normally closed electromagnetic valve (16) is normally closed, high-pressure oil of a high-pressure energy accumulator (14) is input into a power assisting cavity (18) through the first normally closed electromagnetic valve (15), a master cylinder first piston (3) is pushed to move to enable a brake master cylinder (8) to be pressurized and enter an electronic stability control system ESC (10), and finally a brake (9) obtains required braking force through adjustment of the electronic stability control system ESC (10), wherein the power cavity (19) is at normal pressure, the power assisting cavity (18) is at high pressure, and the brake master cylinder (8) is at high;
in an electronic failure mode, the electromagnetic valves are all in a normal state, when a driver steps on a brake pedal, the power piston (1) is directly driven to move, the power cavity (19) is enabled to build pressure, the pressure enters the power assisting cavity (18) through the two-position three-way electromagnetic valve (6), the first piston (3) of the main cylinder is further pushed to move, the main brake cylinder (8) is enabled to build pressure and enters the electronic stability control system ESC (10), and finally the brake (9) obtains required braking force through the adjustment of the electronic stability control system ESC (10), at the moment, the power cavity (19) is in a medium pressure state, the power assisting cavity (18) is in a medium pressure state, and the main brake cylinder (8) is in a medium;
a mechanical failure mode, failure of the boost chamber (18), including failure of one or more components associated with the boost, when the braking system loses boost, when a driver steps on a brake pedal, the power piston (1) is directly driven to move, the first piston (3) of the main cylinder can be pushed to move only by eliminating the decoupling clearance, before the power piston (1) contacts the first piston (3) of the main cylinder, the system has no brake, after the power piston (1) contacts the first piston (3) of the master cylinder, the first piston (3) of the master cylinder pushes the brake master cylinder (8) to build pressure, high-pressure brake fluid enters the electronic stability control system ESC (10), and finally the brake (9) obtains required braking force through the adjustment of the electronic stability control system ESC (10), at the moment, the brake system has no assistance, at the moment, the power cavity (19) is at normal pressure, the power cavity (18) is at normal pressure, and the brake master cylinder (8) is at medium pressure;
in a pure motor feedback braking mode, an Electronic Control Unit (ECU) of the system controls a two-position three-way electromagnetic valve (6) to be electrified and communicated with a pedal simulator (7), a first normally closed electromagnetic valve (15) is normally closed, a second normally closed electromagnetic valve (16) is normally closed, a driver steps on a pedal to drive a power piston (1) to move forwards, brake fluid pushing a power assisting cavity (19) enters the pedal simulator (7) through the two-position three-way electromagnetic valve (6), the pedal simulator (7) provides pedal feedback for the driver at the moment, pedal force and stroke are simulated, braking force is provided by a vehicle driving motor, decoupling gaps can be continuously reduced but do not disappear in the whole braking process, at the moment, a power cavity (19) is in a medium pressure, a power assisting cavity (18) is in a normal pressure, and a brake main cylinder (8.
10. A vehicle characterized by comprising a simple and reliable electro-hydraulic brake system according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132680.1A CN111348020A (en) | 2019-11-19 | 2019-11-19 | Simple and reliable electronic hydraulic braking system and method and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911132680.1A CN111348020A (en) | 2019-11-19 | 2019-11-19 | Simple and reliable electronic hydraulic braking system and method and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111348020A true CN111348020A (en) | 2020-06-30 |
Family
ID=71190443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911132680.1A Withdrawn CN111348020A (en) | 2019-11-19 | 2019-11-19 | Simple and reliable electronic hydraulic braking system and method and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111348020A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113022521A (en) * | 2021-03-25 | 2021-06-25 | 华南理工大学 | Brake system and method for wheel-side vehicle |
| CN113460011A (en) * | 2021-08-08 | 2021-10-01 | 吉林东光奥威汽车制动***有限公司 | Pressurizing block capable of being generally used for braking assistance |
| CN113895421A (en) * | 2021-10-27 | 2022-01-07 | 奇瑞新能源汽车股份有限公司 | Failure control method and device for electronic booster, electronic equipment and storage medium |
| CN114162102A (en) * | 2021-10-08 | 2022-03-11 | 武汉元丰汽车电控***股份有限公司 | Hydraulic brake system, hydraulic brake control method and related equipment |
| CN114312705A (en) * | 2020-09-29 | 2022-04-12 | 比亚迪股份有限公司 | Braking system and vehicle |
| CN115009247A (en) * | 2022-07-08 | 2022-09-06 | 燕山大学 | EHB drive-by-wire braking system with redundancy function |
| CN115352423A (en) * | 2022-08-19 | 2022-11-18 | 东风越野车有限公司 | Electronic hydraulic braking system energy accumulator pressure control and fault detection system and method |
| CN115366857A (en) * | 2022-08-29 | 2022-11-22 | 珠海博众科企业管理合伙企业(有限合伙) | Can increase hydraulic booster assembly device of discharge capacity |
| CN116039593A (en) * | 2023-02-17 | 2023-05-02 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
-
2019
- 2019-11-19 CN CN201911132680.1A patent/CN111348020A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114312705A (en) * | 2020-09-29 | 2022-04-12 | 比亚迪股份有限公司 | Braking system and vehicle |
| CN113022521A (en) * | 2021-03-25 | 2021-06-25 | 华南理工大学 | Brake system and method for wheel-side vehicle |
| CN113460011A (en) * | 2021-08-08 | 2021-10-01 | 吉林东光奥威汽车制动***有限公司 | Pressurizing block capable of being generally used for braking assistance |
| CN114162102B (en) * | 2021-10-08 | 2023-01-17 | 武汉元丰汽车电控***股份有限公司 | Hydraulic brake system, hydraulic brake control method and related equipment |
| CN114162102A (en) * | 2021-10-08 | 2022-03-11 | 武汉元丰汽车电控***股份有限公司 | Hydraulic brake system, hydraulic brake control method and related equipment |
| CN113895421A (en) * | 2021-10-27 | 2022-01-07 | 奇瑞新能源汽车股份有限公司 | Failure control method and device for electronic booster, electronic equipment and storage medium |
| CN115009247A (en) * | 2022-07-08 | 2022-09-06 | 燕山大学 | EHB drive-by-wire braking system with redundancy function |
| CN115009247B (en) * | 2022-07-08 | 2023-09-26 | 燕山大学 | EHB line control braking system with redundancy function |
| CN115352423A (en) * | 2022-08-19 | 2022-11-18 | 东风越野车有限公司 | Electronic hydraulic braking system energy accumulator pressure control and fault detection system and method |
| CN115366857A (en) * | 2022-08-29 | 2022-11-22 | 珠海博众科企业管理合伙企业(有限合伙) | Can increase hydraulic booster assembly device of discharge capacity |
| CN115366857B (en) * | 2022-08-29 | 2023-12-01 | 珠海博众科企业管理合伙企业(有限合伙) | Hydraulic booster assembly device capable of increasing displacement |
| CN116039593A (en) * | 2023-02-17 | 2023-05-02 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
| CN116039593B (en) * | 2023-02-17 | 2024-04-26 | 湘潭大学 | Dual-drive brake and control method of hybrid brake-by-wire system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111348020A (en) | Simple and reliable electronic hydraulic braking system and method and vehicle | |
| CN106891878B (en) | Motor-driven electronic hydraulic brake system with improved master cylinder | |
| CN106476777B (en) | Decoupling electronic hydraulic power-assisted braking system and braking method | |
| CN108162943B (en) | The compound line control brake system and its brake control method of four-wheel pressure independent control | |
| CN109177944B (en) | Hydraulically-coupled electronic hydraulic brake system | |
| CN106218619B (en) | A kind of electro-hydraulic servo braking system with multiple-working mode | |
| CN105667485B (en) | A kind of energy assisted braking system for automobile | |
| CN104802777B (en) | A kind of analog EHB of pedal sense active | |
| CN107444365B (en) | Electronic line control brake system | |
| CN209955966U (en) | Split type electro-hydraulic brake device | |
| CN105946837A (en) | Electronic hydraulic braking system with multiple working modes | |
| CN103754206A (en) | Mechanical, electronic and hydraulic brake system | |
| CN103950443A (en) | Pedal feeding active control type electronic hydraulic braking system | |
| CN112141067B (en) | Brake system of integrated electro-hydraulic brake source wheel-side coupling device and control method thereof | |
| CN106427967A (en) | Brake by-wire system used for full mechanical decoupling automobile | |
| CN203766754U (en) | Separating type brake master cylinder assembly with driving hydraulic power assistance and driven hydraulic power assistance | |
| CN111284465A (en) | Braking system suitable for automatic driving and control method | |
| CN106314404B (en) | brake-by-wire system with oil pressure boosting and control method thereof | |
| CN207683519U (en) | Brake pedal and servomechanism complete separated type anti-bending electric booster braking system | |
| CN106427964A (en) | Control-by-wire hydraulic braking system and control method thereof | |
| CN216185080U (en) | Three-channel brake system of electric automobile | |
| CN110696798A (en) | Electronic hydraulic braking system and method applied to large-tonnage vehicle and large-tonnage vehicle | |
| CN103231704A (en) | Electro-hydraulic compound braking system based on hydraulic control unit and integrated braking master cylinder | |
| CN113071466A (en) | Multifunctional shuttle valve type dual-motor redundant braking system and control method | |
| CN205417597U (en) | Integrated automatically controlled hydraulic braking system of vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201217 Address after: No. 456, Binhai 4th Road, Wenzhou Economic and Technological Development Zone, Wenzhou City, Zhejiang Province Applicant after: Wenzhou Ruili Automobile Technology Co.,Ltd. Address before: 325299 2666 Development Zone, Ruian Economic Development Zone, Wenzhou, Zhejiang Applicant before: Ruili Group Ruian Auto Parts Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240516 Address after: No. 456, Binhai 4th Road, Wenzhou Economic and Technological Development Zone, Wenzhou City, Zhejiang Province Applicant after: WENZHOU RUILI KORMEE AUTOMOTIVE ELECTRONICS CO.,LTD. Country or region after: China Address before: No. 456, Binhai 4th Road, Wenzhou Economic and Technological Development Zone, Wenzhou City, Zhejiang Province Applicant before: Wenzhou Ruili Automobile Technology Co.,Ltd. Country or region before: China |
|
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200630 |