CN113479181A - Wire-controlled electronic hydraulic brake system of minicar - Google Patents
Wire-controlled electronic hydraulic brake system of minicar Download PDFInfo
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- CN113479181A CN113479181A CN202110972404.7A CN202110972404A CN113479181A CN 113479181 A CN113479181 A CN 113479181A CN 202110972404 A CN202110972404 A CN 202110972404A CN 113479181 A CN113479181 A CN 113479181A
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- plunger pump
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims description 19
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—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 electrical assistance or drive
-
- 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
- B60T2220/00—Monitoring, detecting driver behaviour; Signalling thereof; Counteracting thereof
- B60T2220/04—Pedal travel sensor, stroke sensor; Sensing brake request
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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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/82—Brake-by-Wire, EHB
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a line control electronic hydraulic brake system which relates to the technical field of automobile braking and is suitable for a minicar, wherein the system mainly comprises a liquid storage tank, a brake master cylinder, a displacement sensor, an electronic control unit and a hydraulic execution unit; the hydraulic execution unit comprises a pressure regulating normally-closed valve, an emergency braking normally-opened valve, a plunger pump, a decoupling plunger pump and a motor; a vacuum booster and a vacuum pump are not used, and a mode of driving a plunger pump by a motor is adopted to provide boosting for braking; the electromagnetic valve is used for controlling the magnitude of the brake pressure so as to realize the brake function; the brake has the characteristics of small volume, low cost, high braking speed and good durability.
Description
Technical Field
The invention relates to the technical field of automobile braking, in particular to a wire-controlled electronic hydraulic braking system for a minicar.
Background
With the rapid development of new energy automobiles and intelligent driving, the application of a wire-controlled electronic hydraulic brake system on the automobile is more and more, and at present, ibooster, EHB and the like are mainly applied on a large scale. However, for the car models such as the mini car (a 00-grade or smaller car) with light car body, short wheelbase and small braking force, the ibooster and EHB wire control electronic hydraulic brake system is no longer suitable for the market demand due to the large volume and high cost. Therefore, it is necessary to develop a line-control electronic hydraulic brake system suitable for a miniature vehicle, which can reduce the number of the whole mechanical parts of the vehicle, save the installation space and reduce the production cost on the premise of ensuring the braking safety.
Disclosure of Invention
In order to solve the problem of high cost of a brake-by-wire system of a miniature vehicle, the invention provides a novel brake-by-wire electronic hydraulic brake system with small volume and low cost, a vacuum booster of the traditional brake is cancelled, and a motor of the system is used for driving a plunger pump to work as a brake to provide boosting; the electromagnetic valve is used for controlling the magnitude of the braking pressure, so that the active braking function can be realized; on the basis of the active braking function, the automobile brake system is matched with other automobile parts, and the functions of braking energy recovery, intelligent driving, unmanned driving and the like can be realized.
The technical scheme adopted by the invention is as follows: a wire-controlled electronic hydraulic brake system of a minicar comprises a liquid storage tank 1, a brake master cylinder 2, a displacement sensor 3, an electronic control unit and a hydraulic execution unit; the hydraulic execution unit comprises a pressure regulating normally-closed valve 21, an emergency braking normally-opened valve 23, a plunger pump 7, a decoupling plunger pump and a motor 14; the pressure regulating normally-closed valve 21 is directly connected with the liquid storage tank 1 through an oil pipe; the emergency brake normally open valve 23 is directly connected with the brake master cylinder 2 through an oil pipe; the displacement sensor 3 is arranged on the brake master cylinder 2 and feeds a pedal displacement signal back to the electronic control unit; the electronic control unit controls a motor 14, the motor 14 drives a plunger pump 7 and a decoupling plunger pump to work, brake fluid in the liquid storage tank 1 is pumped into a vehicle wheel cylinder through a third pressure-increasing normally-open valve 17 and a fourth pressure-increasing normally-open valve 18 to realize braking, and when a driver releases a brake pedal, the brake fluid in the vehicle wheel cylinder returns to the liquid storage tank 1 through a pressure-regulating normally-closed valve 21. Preferably, decoupling plunger pump quantity is 1~3, increases decoupling plunger pump's quantity in order to increase driver's comfort.
Compared with the prior art, the invention has the beneficial effects that:
1. the use of a vacuum booster and a vacuum pump is eliminated, and the braking system has the advantages of small volume, low cost, high cost performance and good market prospect;
2. the Electronic Stability Control (ESC) function of the vehicle body can be completely realized, the ESC function comprises anti-lock braking (ABS), braking force distribution regulation (EBD), Traction Control (TCS), vehicle dynamic stability control (VDC) and other ESC related additional functions, and the maximum pressure regulation which is in accordance with the current road surface adhesion coefficient can be carried out on all wheels;
3. the automobile brake system can realize a conventional brake function and an active brake function, can be matched with other automobile parts on the basis of the active brake function, can realize the functions of brake energy recovery, intelligent driving, unmanned driving and the like in a single-shaft full decoupling mode, and has strong system integration.
Drawings
FIG. 1 is a schematic diagram of a by-wire electro-hydraulic brake system according to an embodiment of the present invention;
in the figure: the hydraulic brake system comprises a liquid storage tank 1, a brake master cylinder 2, a displacement sensor 3, a first pressure sensor 4, a pressure-regulating normally-open electromagnetic valve 5, a second-stage normally-closed valve 6, a plunger pump 7, a first pressure-boosting normally-open valve 8, a second pressure-boosting normally-open valve 9, a check valve 10, an energy accumulator 11, a first pressure-reducing normally-closed valve 12, a second pressure-reducing normally-closed valve 13, a motor 14, a third pressure-reducing normally-closed valve 15, a fourth pressure-reducing normally-closed valve 16, a third pressure-boosting normally-open valve 17, a fourth pressure-boosting normally-open valve 18, a first decoupling plunger pump 19, a second decoupling plunger pump 20, a pressure-regulating normally-closed valve 21, a second pressure sensor 22 and an emergency brake normally-open valve 23.
Detailed Description
Embodiments of the invention are further described below with reference to the accompanying drawings:
the decoupling plunger pumps can be set to be 1, 2 or 3, or even more, and when factors such as brake safety, manufacturing cost and driver comfort are comprehensively considered and guaranteed, the decoupling plunger pumps are set to be 2 in the embodiment, as shown in fig. 1, the main components of the drive-by-wire electronic hydraulic brake system of the minicar comprise a liquid storage tank 1, a brake master cylinder 2, a displacement sensor 3, a first pressure sensor 4, a second pressure sensor 22, a hydraulic execution unit and an electronic control unit; the hydraulic execution unit comprises a pressure-regulating normally-open electromagnetic valve 5, a two-stage normally-closed valve 6, a plunger pump 7, a motor 14, a first decoupling plunger pump 19, a second decoupling plunger pump 20, a first pressure-boosting normally-open valve 8, a second pressure-boosting normally-open valve 9, a third pressure-boosting normally-open valve 17, a fourth pressure-boosting normally-open valve 18, a one-way valve 10, an energy accumulator 11, a first pressure-reducing normally-closed valve 12, a second pressure-reducing normally-closed valve 13, a third pressure-reducing normally-closed valve 15, a fourth pressure-reducing normally-closed valve 16, a pressure-regulating normally-closed valve 21 and an emergency braking normally-open valve 23.
Two channels of the decoupling plunger pump are connected with the same brake shaft (shaft requiring more brake force during full-force braking) of the whole vehicle, and can be used for realizing full-decoupling brake energy recovery. The other two channels are connected with the other brake shaft (shaft requiring less brake force during full-force braking) of the whole vehicle and are used for realizing the foot feeling simulation.
The implementation working conditions of the invention are described by taking a vehicle model with a front axle realizing a decoupling function and a rear axle realizing a foot feeling simulation as an example.
When a driver intends to brake by stepping on the brake pedal, the displacement sensor 3 feeds back a brake pedal displacement signal to the electronic control unit, the electronic control unit judges the brake intention of the driver according to the displacement signal fed back by the displacement sensor 3, the electronic control unit controls the action of the relevant solenoid valve, and different brake forces are applied to the front wheels according to the displacement signal to meet the brake intention of the driver. The specific implementation details are as follows: when a driver presses a brake pedal to brake, brake fluid in a cavity (close to a pedal cavity) of a brake master cylinder 2 MC1 enters two wheel cylinders of a rear wheel through a pressure regulating normally-open electromagnetic valve 5, a first pressure increasing normally-open valve 8 and a second pressure increasing normally-open valve 9 respectively, and the rear wheel cylinders are used for simulating pedal feeling; meanwhile, the displacement sensor 3 feeds back a brake pedal displacement signal to the electronic control unit, the electronic control unit judges the braking intention of the driver according to the displacement signal fed back by the displacement sensor 3, the emergency brake normally-open valve 23 is closed, and the brake master cylinder 2 MC2 cavity (far pedal cavity) is prevented from entering the front wheel cylinder, so that the boosting brake is not influenced. The electronic control unit controls the motor 14 to start working, the motor 14 drives the first decoupling plunger pump 19 and the second decoupling plunger pump 20 to work, the first decoupling plunger pump 19 and the second decoupling plunger pump 20 pump brake fluid in the liquid storage tank 1 to two front wheel cylinders through the third pressurization normally-open valve 17 and the fourth pressurization normally-open valve 18, meanwhile, the pressure regulating normally-closed valve 21 is controlled to work, and the pressure of the wheel cylinders is regulated to a target pressure value to realize conventional braking. The third supercharging normally-open valve 17, the fourth supercharging normally-open valve 18 and the pressure regulating normally-closed valve 21 are linear electromagnetic valves, and linear control can be realized; according to the displacement signals fed back by the displacement sensor 3 and the pressure signals of the components fed back by the first pressure sensor 4 and the second pressure sensor 22, the electronic control unit controls the opening and closing of the electromagnetic valve, and the system can output linear brake pressure. When the driver releases the brake pedal to finish braking, the electronic control unit judges the intention of the driver to finish braking according to the displacement signal fed back by the displacement sensor 3, at this time, the electronic control unit controls the motor 14 to stop working, the pressure regulating normally-closed valve 21 is opened, the front wheel cylinder brake fluid passes through the third supercharging normally-opened valve 17 and the fourth supercharging normally-opened valve 18 and then returns to the liquid storage tank 1 through the pressure regulating normally-closed valve 21, and the rear wheel cylinder brake fluid passes through the first supercharging normally-opened valve 8 and the second supercharging normally-opened valve 9 and then returns to the brake master cylinder 2 through the pressure regulating normally-opened electromagnetic valve 5 and finally returns to the liquid storage tank 1 through the brake master cylinder 2. After the brake fluid returns to the liquid storage tank 1, the electronic control unit cuts off the power of all the electromagnetic valves, and the conventional brake is finished.
When the electronic control unit receives an active braking request signal sent by the vehicle, the electronic control unit controls the motor 14 and the electromagnetic valve to work. The electronic control unit controls the motor 14 to start working, the motor 14 drives the first decoupling plunger pump 19 and the second decoupling plunger pump 20 to work, the first decoupling plunger pump 19 and the second decoupling plunger pump 20 pump brake fluid in the liquid storage tank 1 to two front wheel cylinders through the third pressurization normally-open valve 17 and the fourth pressurization normally-open valve 18, meanwhile, the pressure regulating normally-closed valve 21 is controlled to work, and the pressure of the wheel cylinders is regulated to a target pressure value to realize braking. After the braking target is finished, the electronic control unit controls the motor 14 to stop working, the pressure regulating normally-closed valve 21 is opened, the brake fluid of the front wheel cylinder passes through the third pressure boosting normally-opened valve 17 and the fourth pressure boosting normally-opened valve 18 and then returns to the liquid storage tank 1 through the pressure regulating normally-closed valve 21, and then the electronic control unit cuts off the power of all the electromagnetic valves to finish the active braking.
The invention can realize the energy recovery function when being applied to new energy vehicle types. When the driver lightly steps on or moderately steps on the brake pedal, the front axle brake is not involved, and the front axle brake is completely braked by the vehicle motor, so that the energy recovery is realized. The specific implementation is as follows: when a driver slightly or moderately steps on a brake pedal, brake fluid in a cavity (close to a pedal cavity) of the brake master cylinder 2 MC1 respectively enters two wheel cylinders of a rear wheel through the pressure regulating normally-open electromagnetic valve 5, the first pressure increasing normally-open valve 8 and the second pressure increasing normally-open valve 9, and pedal feeling is simulated by the rear wheel cylinders; meanwhile, the displacement sensor 3 feeds back a brake pedal displacement signal to the electronic control unit, the electronic control unit judges the braking intention of the driver according to the displacement signal fed back by the displacement sensor 3, the emergency braking normally open valve 23 is closed, the cavity (far pedal cavity) of the brake master cylinder 2 MC2 is prevented from entering the front wheel cylinder, the front wheel brake is implemented by the reverse dragging of the vehicle motor, and the front wheel drives the vehicle motor to reversely rotate to charge the vehicle energy storage device, so that the brake energy recovery is completed. When a driver steps on or re-steps on a brake pedal, the brake cannot provide enough brake force only by means of braking of a vehicle motor, the brake master cylinder 2 MC1 cavity (near pedal cavity) brake fluid enters two wheel cylinders of a rear wheel through a pressure regulating normally open electromagnetic valve 5, a first pressure boosting normally open valve 8 and a second pressure boosting normally open valve 9 respectively when the driver steps on or heavily steps on the brake pedal, and the pedal feeling is simulated by using the rear wheel cylinders; meanwhile, the displacement sensor 3 feeds back a brake pedal displacement signal to the electronic control unit, the electronic control unit judges the braking intention of the driver according to the displacement signal fed back by the displacement sensor 3, the emergency brake normally-open valve 23 is closed, and the brake master cylinder 2 MC2 cavity (far pedal cavity) is prevented from entering the front wheel cylinder, so that the boosting brake is not influenced. The electronic control unit controls the motor 14 to start working, the motor 14 drives the first decoupling plunger pump 19 and the second decoupling plunger pump 20 to work, the first decoupling plunger pump 19 and the second decoupling plunger pump 20 pump brake fluid in the liquid storage tank 1 to two wheel cylinders of the front wheel through the third pressurization normally-open valve 17 and the fourth pressurization normally-open valve 18, meanwhile, the pressure regulating normally-closed valve 21 is controlled to work, and the pressure of the wheel cylinders is regulated to a target pressure value to work together with a vehicle motor so as to realize front wheel braking and energy recovery. When the vehicle motor does not carry out braking energy recovery or the vehicle energy recovery system is damaged, the vehicle braking is completely realized by the invention, and the implementation process is completely the same as the conventional braking.
When the system is powered off and manual emergency braking is needed, a driver steps on a brake pedal to push a brake master cylinder 2 piston to move, all the electromagnetic valves are in a power-off state, brake fluid in a cavity of the brake master cylinder 2 MC1 enters two rear wheel cylinders respectively through a pressure regulating normally-open electromagnetic valve 5, a first pressure increasing normally-open valve 8 and a second pressure increasing normally-open valve 9, brake fluid in a cavity of the brake master cylinder 2 MC2 enters two front wheel cylinders through an emergency braking normally-open valve 23, a third pressure increasing normally-open valve 17 and a fourth pressure increasing normally-open valve 18, and emergency braking is completed. After the emergency braking is finished, the brake pedal is released, the two rear wheel cylinder brake fluids return to the brake master cylinder 2 through the third pressure-boosting normally-open valve 17, the fourth pressure-boosting normally-open valve 18 and the emergency brake normally-open valve 23, the two rear wheel cylinder brake fluids return to the brake master cylinder 2 through the first pressure-boosting normally-open valve 8, the second pressure-boosting normally-open valve 9 and the pressure-regulating normally-open electromagnetic valve 5, and finally all the brake fluids from the wheel cylinders return to the liquid storage tank 1 through the brake master cylinder 2.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. The utility model provides a minicar drive-by-wire electron hydraulic braking system, includes liquid storage pot (1), brake master cylinder (2), displacement sensor (3), electronic control unit, hydraulic pressure execution unit, its characterized in that: the hydraulic execution unit comprises a pressure regulating normally-closed valve (21), an emergency braking normally-opened valve (23), a plunger pump (7), a decoupling plunger pump and a motor (14); the pressure regulating normally-closed valve (21) is directly connected with the liquid storage tank (1) through an oil pipe; the emergency brake normally open valve (23) is directly connected with the brake master cylinder (2) through an oil pipe; the displacement sensor (3) is arranged on the brake master cylinder (2) and feeds a pedal displacement signal back to the electronic control unit; the electronic control unit controls the motor (14), the motor (14) drives the plunger pump (7) and the decoupling plunger pump to work, brake fluid in the liquid storage tank (1) is pumped into a vehicle wheel cylinder through the third pressure-increasing normally-open valve (17) and the fourth pressure-increasing normally-open valve (18) to realize braking, and when a driver releases a brake pedal, the brake fluid in the vehicle wheel cylinder returns to the liquid storage tank (1) through the pressure-adjusting normally-closed valve (21).
2. The micro-automobile by-wire electronic hydraulic brake system according to claim 1, characterized in that: the number of the decoupling plunger pumps is 1-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110972404.7A CN113479181A (en) | 2021-08-24 | 2021-08-24 | Wire-controlled electronic hydraulic brake system of minicar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110972404.7A CN113479181A (en) | 2021-08-24 | 2021-08-24 | Wire-controlled electronic hydraulic brake system of minicar |
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| Publication Number | Publication Date |
|---|---|
| CN113479181A true CN113479181A (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110972404.7A Pending CN113479181A (en) | 2021-08-24 | 2021-08-24 | Wire-controlled electronic hydraulic brake system of minicar |
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| Country | Link |
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| CN (1) | CN113479181A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110035937A (en) * | 2016-12-14 | 2019-07-19 | 罗伯特·博世有限公司 | Motor vehicle braking system and method |
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2021
- 2021-08-24 CN CN202110972404.7A patent/CN113479181A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110035937A (en) * | 2016-12-14 | 2019-07-19 | 罗伯特·博世有限公司 | Motor vehicle braking system and method |
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Application publication date: 20211008 |
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