CN112389401B - Electric control hydraulic braking system - Google Patents
Electric control hydraulic braking system Download PDFInfo
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- CN112389401B CN112389401B CN202011308033.4A CN202011308033A CN112389401B CN 112389401 B CN112389401 B CN 112389401B CN 202011308033 A CN202011308033 A CN 202011308033A CN 112389401 B CN112389401 B CN 112389401B
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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
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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
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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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
- 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
- B60T8/409—Systems with stroke simulating devices for driver input characterised by details of the stroke simulating device
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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
- 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
- B60T8/88—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Regulating Braking Force (AREA)
Abstract
The utility model provides an automatically controlled hydraulic braking system includes the oil tank, first jar, the second jar, the driving piece, the feed liquor valve, the wheel cylinder, first fluid passage, first isolating valve, second fluid passage and play liquid valve, the driving piece even drives the first piston removal of second jar, the wheel cylinder is connected in the feed liquor valve, first fluid passage is located between first jar and the feed liquor valve, first isolating valve is located first fluid passage, the second fluid passage is located between second jar and the feed liquor valve, be equipped with forward control valve and reverse control valve on the second fluid passage, it connects between wheel cylinder and oil tank to go out the liquid valve. The electric control hydraulic braking system can realize four braking modes through the design of the oil way, can meet the braking requirement when the electric control fails and has higher system reliability, can meet various different braking force requirements, and can meet the requirement on the braking system in the current intelligent driving; and the system has high integration level, light weight, relatively low cost and obvious product advantages.
Description
Technical Field
The invention relates to the technical field of automobile braking systems, in particular to an electric control hydraulic braking system.
Background
The traditional automobile braking system can be divided into a manual braking system, a dynamic braking system, a servo braking system and the like, but along with the development of the electric automobile industry, the braking system in the existing automobile field has the technical problems of slow braking response, low braking pressure control precision and the like, and can not meet the high braking performance requirement of the electric automobile.
However, the electric control failure of the electric control hydraulic brake system can occur, and the vehicle cannot be driven normally due to the electric control failure of the brake, so that a serious accident can occur. To this end, a need for redundant backup of the brake system is currently present.
The foregoing description is provided for general background information and is not admitted to be prior art.
Disclosure of Invention
The invention aims to provide an electric control hydraulic braking system which can guarantee braking and improve the reliability of the system under the condition of electric control failure.
The invention provides an electrically controlled hydraulic brake system, comprising:
an oil tank;
a first cylinder connected to the oil tank;
the second cylinder is connected to the oil tank and comprises a first cavity, a second cavity and a first piston, and the first cavity and the second cavity are respectively positioned on two sides of the first piston;
a drive connected to the second cylinder to drive the first piston to move in the second cylinder in a first direction or a second direction opposite to the first direction;
a liquid inlet valve;
a wheel cylinder connected to the liquid inlet valve;
a first fluid path connected between the first cylinder and the fluid inlet valve;
a first isolation valve disposed on the first liquid path to connect or disconnect the first cylinder with or from the liquid inlet valve;
the second liquid way, it is located the second jar with between the feed liquor valve, be equipped with forward control valve, reverse control valve, sixth check valve and third isolation valve on the second liquid way, reverse control valve connect in between first chamber and the feed liquor valve, forward control valve connect in the second chamber with between the feed liquor valve, the second chamber with reverse control valve's liquid outlet intercommunication, forward control valve with reverse control valve is the ooff valve, the sixth check valve is located reverse control valve's liquid outlet with set up between forward control valve's the liquid outlet and allow fluid to follow between forward control valve's the liquid outlet flow direction reverse control valve's liquid outlet, the third isolation valve is located forward control valve with between the feed liquor valve, with disconnection or intercommunication forward control valve with the feed liquor valve.
In one embodiment, the electrically controlled hydraulic brake system comprises a first brake mode, a second brake mode, a third brake mode and a mechanical backup mode, in the first brake mode, the forward control valve is closed, the second chamber is disconnected from the liquid outlet of the reverse control valve, the sixth one-way valve and the third isolation valve are opened, the first chamber is communicated with the liquid inlet valve, and the driving member drives the first piston to move towards the first direction; in the second braking mode, the forward control valve, the reverse control valve, the sixth one-way valve and the third isolation valve are opened, the second cavity is communicated with the liquid outlet of the reverse control valve, the first cavity is communicated with the liquid inlet valve, and the driving piece drives the first piston to move towards the first direction; in the third braking mode, the forward control valve, the sixth one-way valve and the third isolation valve are opened, the second chamber is communicated with the liquid outlet of the reverse control valve, the reverse control valve is closed, the first chamber is disconnected from the liquid inlet valve, and the driving member drives the first piston to move towards the second direction; in the mechanical backup mode, the first cylinder is in communication with the inlet valve.
In one embodiment, the electronic control hydraulic braking system further includes a second isolation valve, the second isolation valve is disposed between the inlet of the reverse control valve and the forward control valve and between the outlets of the reverse control valve, and the second isolation valve is connected between the sixth one-way valve and the forward control valve, the second isolation valve allows the brake fluid of the inlet of the reverse control valve to flow to the outlet of the forward control valve and the inlet of the reverse control valve, but does not allow the brake fluid of the outlet of the forward control valve and the inlet of the reverse control valve to flow to the inlet of the reverse control valve.
In one embodiment, the second isolation valve is an on-off valve or a one-way valve.
In one embodiment, the first fluid path includes two sub fluid paths, and each sub fluid path is provided with one first isolation valve;
the liquid inlet valve comprises a first liquid inlet valve, a second liquid inlet valve, a third liquid inlet valve and a fourth liquid inlet valve, the wheel cylinders comprise a first wheel cylinder, a second wheel cylinder, a third wheel cylinder and a fourth wheel cylinder, a liquid inlet of the first wheel cylinder is connected to a liquid outlet of the first liquid inlet valve, a liquid inlet of the second wheel cylinder is connected to a liquid outlet of the second liquid inlet valve, a liquid inlet of the third wheel cylinder is connected to a liquid outlet of the third liquid inlet valve, a liquid inlet of the fourth wheel cylinder is connected to a liquid outlet of the fourth liquid inlet valve, one of the sub-oil passages and the reverse control valve is connected to liquid inlets of the first liquid inlet valve and the second liquid inlet valve, and the other sub-oil passage and the forward control valve are connected to the third liquid inlet valve and the fourth liquid inlet valve.
In one embodiment, the first liquid inlet valve, the second liquid inlet valve, the third liquid inlet valve and the fourth liquid inlet valve are respectively connected with a first check valve, a second check valve, a third check valve and a fourth check valve in parallel;
automatically controlled hydraulic braking system still includes out the liquid valve, it includes first liquid valve, second liquid valve, third liquid valve and fourth liquid valve to go out the liquid valve, first liquid valve connect in first wheel cylinder with between the oil tank, the second liquid valve connect in the second wheel cylinder with between the oil tank, the third liquid valve connect in the third wheel cylinder with between the oil tank, the fourth liquid valve connect in the fourth wheel cylinder with between the oil tank.
In one embodiment, the oil tank is respectively communicated with the first cavity and the second cavity of the second cylinder, a first one-way valve is arranged between the oil tank and the first cavity, a fifth one-way valve and a pressure relief valve are connected in parallel between the oil tank and the second cavity, and the pressure relief valve is used for connecting or disconnecting the oil tank and the second cavity.
In one embodiment, the electronically controlled hydraulic brake system further includes an input device, the first cylinder includes a second piston and a third piston, the first cylinder is divided into a third chamber and a fourth chamber by the second piston, the input device is connected to the third piston, the third piston is disposed in the fourth chamber, and the input device is configured to push the third piston to move in the first cylinder.
In one embodiment, the electrically controlled hydraulic brake system further includes a test valve connected between the oil tank and the fourth chamber of the first cylinder for communicating or disconnecting the oil tank and the fourth chamber of the first cylinder.
In one embodiment, the electrically controlled hydraulic brake system further includes a pedal simulator disposed at the input device, the pedal simulator being connected to the fourth chamber of the first cylinder, and the fourth chamber building pressure on the pedal simulator when outputting oil.
According to the electric control hydraulic braking system, through the design of the oil way, four braking modes, namely a first braking mode, a second braking mode, a third braking mode and a mechanical backup mode, can meet the braking requirement when electric control fails and the system reliability is high, can meet various different braking force requirements, and can meet the requirement on the braking system in current intelligent driving; and the system has high integration level, light weight, relatively low cost and obvious product advantages.
Drawings
Fig. 1 is a state diagram of a mechanical backup mode of an electro-hydraulic brake system according to an embodiment of the present invention.
FIG. 2 is a state diagram of a first braking mode of the electro-hydraulic brake system of FIG. 1.
FIG. 3 is a state diagram of a second braking mode of the electro-hydraulic brake system of FIG. 1.
FIG. 4 is a state diagram of a third braking mode of the electro-hydraulic brake system of FIG. 1.
Fig. 5 is a state diagram of a mechanical backup mode of an electro-hydraulic brake system according to another embodiment of the present invention.
FIG. 6 is a state diagram of a first braking mode of the electro-hydraulic brake system of FIG. 5.
FIG. 7 is a state diagram of a second braking mode of the electro-hydraulic brake system of FIG. 5.
FIG. 8 is a state diagram of a third braking mode of the electro-hydraulic brake system of FIG. 5.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of an electric control hydraulic brake system according to an embodiment of the present invention. The electrically controlled hydraulic brake system according to an embodiment of the present invention includes an input device 11, an oil tank 12, a first cylinder 13, a second cylinder 15, a driving member 17, an intake valve 19, a wheel cylinder 21, a first fluid path 23, and a second fluid path 25. The first cylinder 13 and the second cylinder 15 are connected to the oil tank 12, respectively, and oil is supplied from the oil tank 12. The first fluid path 23 is connected between the first cylinder 13 and the intake valve 19, the second fluid path 25 is provided between the second cylinder 15 and the intake valve 19, and the first fluid path 23 and the second fluid path 25 are alternatively communicated with the intake valve 19, and the oil enters the wheel cylinder 21 through the intake valve 19 to brake the wheel. The second cylinder 15 includes a first chamber 152, a second chamber 154, and a first piston 157, and the first chamber 152 and the second chamber 154 are located at both sides of the first piston 157, respectively. The wheel cylinders 21 are connected to the liquid inlet valves 19. The second fluid path 25 is provided with a forward control valve 27 and a reverse control valve 29, the reverse control valve 29 is used for connecting or disconnecting the first chamber 152 of the second cylinder 15 with the fluid inlet valve 19, the forward control valve 27 is used for connecting or disconnecting the second chamber 154 of the second cylinder 15 with the fluid outlet of the reverse control valve 29, and when the second chamber 154 of the second cylinder 15 is connected with the fluid outlet of the reverse control valve 29, the hydraulic fluid in the first chamber 152 is introduced into the second chamber 154. A drive member 17 is connected to the second cylinder 15 to drive the first piston 157 to move within the second cylinder 15.
In this embodiment, the electrically controlled hydraulic brake system includes a first brake mode, in which the forward control valve 27 is closed, the second chamber 154 is disconnected from the liquid outlet of the reverse control valve 29, the reverse control valve 29 is opened, the first chamber 152 is communicated with the liquid inlet valve 19, and the driving member 17 drives the first piston 157 to move in the first direction; in the second braking mode, the forward control valve 27 is open, the second chamber 154 is communicated with the outlet of the reverse control valve 29, the reverse control valve 29 is open, the first chamber 152 is communicated with the inlet valve 19, and the driving member 17 drives the first piston 157 to move towards the first direction; in the third braking mode, the forward control valve 27 is open, the second chamber 154 is in communication with the outlet of the reverse control valve 29, i.e. with the inlet valve 19, the reverse control valve 29 is closed, the first chamber 152 is disconnected from the inlet valve 19, and the driving member 17 drives the first piston 157 to move in a second direction opposite to the first direction. The first brake mode is an operation mode when the demand for braking force is small, the second brake mode is an operation mode when the demand for braking force is large, and the third brake mode is an operation mode when the demand for braking force is maximum. The electric control hydraulic brake system also comprises a mechanical backup mode, in the mechanical backup mode, the first liquid path 23 is communicated with the liquid inlet valve 19, and oil flows from the oil tank 12 to the liquid inlet valve 19 through the first liquid path 23 and then to the wheel cylinder 21 for braking.
In this embodiment, the electrically controlled hydraulic brake system further includes a first isolation valve 47, and the first isolation valve 47 is disposed on the first fluid path 23 to disconnect or connect the first cylinder 13 and the fluid inlet valve 19.
In this embodiment, a sixth check valve 49 for allowing the oil to flow from the outlet of the forward control valve 27 to the outlet of the reverse control valve 29 is provided between the outlet of the reverse control valve 29 and the outlet of the forward control valve 27. In the present embodiment, a third isolation valve 53 is provided between the forward control valve 27 and the liquid inlet valve 19 to disconnect or connect the forward control valve 27 and the liquid inlet valve 19. Through the arrangement of the sixth one-way valve 49 and the third isolating valve 53, when the pressure cannot be built up due to oil leakage of the sixth one-way valve 49, the third isolating valve 53 can still build up the pressure, brake fluid is provided for two wheel cylinders, effective braking is guaranteed, and potential safety hazards during braking are eliminated.
A second isolation valve 52 is arranged between the liquid inlet of the reverse control valve 29 and the liquid outlets of the forward control valve 27 and the reverse control valve 29, the second isolation valve 52 is connected between the sixth one-way valve 49 and the forward control valve 27, and the second isolation valve 52 is used for disconnecting or communicating the liquid inlet of the reverse control valve 29 and the liquid outlet of the forward control valve 27 and the liquid inlet of the reverse control valve 29. By arranging the second isolation valve 52, brake fluid can pass through the reverse control valve 29 and the second isolation valve 52 and then enter the four wheel cylinders during braking, compared with the situation that only the reverse control valve 29 is arranged in the electric control hydraulic braking system shown in fig. 1, the hole diameters of the reverse control valve 29 and the second isolation valve 52 can be designed to be relatively small, the existing electromagnetic valve can be used, the electromagnetic valve with larger hole diameter and a larger coil do not need to be additionally developed, the manufacturing cost is reduced, and the development period is shortened.
Specifically, the first isolation valve 47, the second isolation valve 52, and the third isolation valve 53 are all switching valves, and may be specifically two-position two-way valves, where the first isolation valve 47, the second isolation valve 52, or the third isolation valve 53 is opened in the left position, and the first isolation valve 47, the second isolation valve 52, or the third isolation valve 53 is closed in the right position.
In the present embodiment, the input device 11 is embodied as a brake pedal.
In this embodiment, the first cylinder 13 includes a second piston 130 and a third piston 131, the first cylinder 13 is divided into a third chamber 132 and a fourth chamber 134 by the second piston 130, the input device 11 is connected to the third piston 131, and the third piston 131 is disposed in the fourth chamber 134, so that when the driver steps on the input device, the third piston 131 is pushed to move in the first cylinder 13, so that the oil entering the first cylinder 13 from the oil tank 12 is output to the first fluid path 23 from the third chamber 132 and the fourth chamber 134.
Specifically, the first fluid passage 23 includes two sub fluid passages, two first isolation valves 47 are provided, and one first isolation valve 47 is provided on each sub fluid passage. The liquid inlet valve 19 comprises a first liquid inlet valve 192, a second liquid inlet valve 193, a third liquid inlet valve 194 and a fourth liquid inlet valve 195, the wheel cylinder 21 comprises a first wheel cylinder 212, a second wheel cylinder 213, a third wheel cylinder 214 and a fourth wheel cylinder 215, a liquid inlet of the first wheel cylinder 212 is connected to a liquid outlet of the first liquid inlet valve 192, a liquid inlet of the second wheel cylinder 213 is connected to a liquid outlet of the second liquid inlet valve 193, a liquid inlet of the third wheel cylinder 214 is connected to a liquid outlet of the third liquid inlet valve 194, and a liquid inlet of the fourth wheel cylinder 215 is connected to a liquid outlet of the fourth liquid inlet valve 195. One of the sub-oil passages and the reverse control valve 29 is connected to the liquid inlets of the first liquid inlet valve 192 and the second liquid inlet valve 193, and the other sub-oil passage and the forward control valve 27 is connected to the third liquid inlet valve 194 and the fourth liquid inlet valve 195. Specifically, the first wheel cylinder 212, the second wheel cylinder 213, the third wheel cylinder 214, and the fourth wheel cylinder 215 are a left front wheel cylinder, a right rear wheel cylinder, a right front wheel cylinder, and a left rear wheel cylinder.
Specifically, the first, second, third and fourth intake valves 192, 193, 194 and 195 are connected in parallel with a first, second, third and fourth check valves 196, 197, 198 and 199, respectively.
Specifically, the electronically controlled hydraulic brake system further includes a drain valve 32, and the drain valve 32 is connected between the wheel cylinder 21 and the oil tank 12 to return oil in the wheel cylinder 21. More specifically, the liquid valves 32 include a first liquid valve 322, a second liquid valve 323, a third liquid valve 324 and a fourth liquid valve 325, the first liquid valve 322 is connected between the first wheel cylinder 212 and the oil tank 12, the second liquid valve 323 is connected between the second wheel cylinder 213 and the oil tank 12, the third liquid valve 324 is connected between the third wheel cylinder 214 and the oil tank 12, and the fourth liquid valve 325 is connected between the fourth wheel cylinder 215 and the oil tank 12.
In this embodiment, the oil tank 12 communicates with the first chamber 152 and the second chamber 154 of the second cylinder 15, respectively. Specifically, a first check valve 33 is provided between the oil tank 12 and the first chamber 152, a fifth check valve 35 and a relief valve 37 are connected in parallel between the oil tank 12 and the second chamber 152, and the relief valve 37 is used for connecting or disconnecting the connection between the oil tank 12 and the second chamber 152. Specifically, the relief valve 37 may be a two-position, two-way solenoid valve.
In this embodiment, the driving member 17 may be a motor, and the motor is started to rotate to drive the first piston 157 of the second cylinder 15 to move back and forth under the action of a transmission mechanism, for example, a lead screw and nut mechanism. Specifically, the electronically controlled hydraulic brake system further includes a motor position sensor 39 to detect the position of the driver 17 and, in turn, the position of the first piston 157 of the second cylinder 15.
In this embodiment, the inlets of the reverse control valve 29 and the second isolation valve 52 are connected to the first chamber 152 of the second cylinder 15, and the outlet of the reverse control valve 29 is connected to the first inlet valve 192 and the second inlet valve 193. An inlet of the forward control valve 27 is communicated with the second chamber 154 of the second cylinder 15, an outlet of the forward control valve 27 is connected to a third inlet valve 194 and a fourth inlet valve 195, and an outlet of the forward control valve 27 is communicated with an outlet of the reverse control valve 29 through a sixth check valve 49.
Specifically, the forward control valve 27 and the reverse control valve 29 may be two-position two-way valves, and the forward control valve 27 or the reverse control valve 29 is opened when the left position is in communication, and the forward control valve 27 or the reverse control valve 29 is closed when the right position is in disconnection.
In this embodiment, the electronically controlled hydraulic brake system further includes a test valve 38, and the test valve 38 is connected between the oil tank 12 and the fourth chamber 134 of the first cylinder 13 for connecting or disconnecting the oil tank 12 and the fourth chamber 134 of the first cylinder 13. Specifically, the test valve 38 may be a two-position, two-way valve.
In the present embodiment, the electronically controlled hydraulic brake system further includes a control module (e.g. an ECU (electronic control unit) (not shown)) and a pedal stroke detecting element 40, wherein the pedal stroke detecting element 40 is connected to the control module and the input device 11, and is used for detecting the stroke of the input device 11 so as to know the braking force demand of the driver and transmit the braking force demand to the control module.
In this embodiment, the electronic control hydraulic brake system further includes a pressure detecting member 41 connected to the third chamber 132 of the first cylinder 13 to detect the pressure of the third chamber 132, and the pressure detecting member 41 is connected to the control module.
In this embodiment, the electronically controlled hydraulic brake system further includes a pedal simulation element 43 disposed at the input device 11, the pedal simulation element 43 is connected to the fourth chamber 134 of the first cylinder 13, when the fourth chamber 134 outputs oil, pressure is built on the pedal simulation element 43, and the pressure on the pedal simulation element 43 makes a driver stepping on the input device 11 feel resistance, thereby realizing simulation of the brake pedal feeling. An analog control valve 45 may also be provided between the pedal simulating member 43 and the first cylinder 13 to communicate or disconnect the first cylinder 13 and the pedal simulating member 43 to simulate or not simulate a brake pedal feel.
In this document, each of the control valves, the test valve, the liquid inlet valve, the liquid outlet valve, the selection valve and the pressure release valve can be an electric control valve, and the state of the electric control valve is controlled by the power on or power off of the electric control valve through an instruction of the control module. The liquid inlet valve 19 is a normally closed valve, and is opened for communication when power is lost and closed for disconnection when power is obtained. The first isolation valve 47 connects the intake valve 19 to the first cylinder 13 when powered on, and connects the intake valve 19 to the first cylinder 13 when powered off.
The working principle of the electrically controlled hydraulic brake system is briefly described below.
Referring to fig. 1 again, in the mechanical backup mode, at this time, the electronic control fails, the control valves are in a non-powered state, the forward control valve 27 and the reverse control valve 29 are both closed, the first isolation valve 47 is opened to communicate the first cylinder 13 with the fluid inlet valve 19, the fluid inlet valve 19 is disconnected from the second fluid path 25, the driver steps on the input device 11, moves the second piston 130 and the third piston 131 to the left, the brake fluid entering the first cylinder 13 from the oil tank 12 is output to the first cylinder 13, and then reaches the fluid inlet valve 19 through the first isolation valve 47 and the first fluid path 23 and is input to the wheel cylinder 21, so as to realize braking. When the brake effect is achieved, the driver releases the input device 11, and the second piston 130 and the third piston 131 move to the right, and the pressure in the wheel cylinder 21 is higher than the pressure in the first cylinder 13, and therefore, the brake fluid returns from the wheel cylinder 21 to the first cylinder 13 through the first check valve 196, the second check valve 197, the third check valve 198, the fourth check valve 199, and the first fluid passage 23.
Referring to fig. 2, in the first braking mode, the braking pressure demand of the driver is small, and the system can determine the magnitude of the braking pressure demand according to the stroke of the input device 11. At this time, the forward control valve 27 is closed and disconnected, the reverse control valve 29, the second isolation valve 52, the third isolation valve 53 and the relief valve 37 are opened and communicated, the first isolation valve 47 is closed and disconnected, the liquid inlet valve 19 and the first cylinder 13 are disconnected, the driver depresses the input device 11, the driving member 17 starts to rotate forward, the first piston 157 is pushed to move leftward, brake liquid enters the first cavity 152 of the second cylinder 15 from the oil tank 12, the brake liquid in the first cavity 152 reaches the wheel cylinder 21 through the reverse control valve 29, the second isolation valve 52, the third isolation valve 53 and the liquid inlet valve 19, braking is achieved, and part of the brake liquid enters the second cavity 154 from the oil tank 12 for oil supplement. Meanwhile, part of the brake fluid in the oil tank 12 is also input into the first cylinder 13, and is pressurized at the pedal simulation element 43 after passing through the simulation control valve 45 so as to simulate the feeling of the brake pedal, wherein part of the brake fluid is also returned to the oil tank 12 after passing through the pedal simulation element 43. When the brake effect is achieved, the driver releases the input device 11, the first piston 157 moves rightward, and the pressure in the wheel cylinder 21 becomes higher than the pressure in the second cylinder 15, so that the brake fluid is returned from the wheel cylinder 21 to the second cylinder 15 through the first check valve 196, the second check valve 197, the third check valve 198, the fourth check valve 199, and the second fluid passage 25.
Referring to fig. 3, in the second braking mode, the driver's demand for braking pressure is greater. At this time, the forward control valve 27, the reverse control valve 29, the second isolation valve 52 and the third isolation valve 53 are opened and communicated, the relief valve 37 is closed and disconnected, the liquid inlet valve 19 is communicated with the second cylinder 15 and disconnected from the first cylinder 13, the driver continues to step on the input device 11 in the first braking mode, the driving member 17 starts to rotate forward to push the first piston 157 to move leftward, the brake liquid enters the first cavity 152 of the second cylinder 15 from the oil tank 12, the brake liquid in the first cavity 152 reaches the wheel cylinder 21 through the reverse control valve 29 and the liquid inlet valve 19, and part of the brake liquid output by the reverse control valve 29 enters the second cavity 154 through the second isolation valve 52 and the forward control valve 27, so that the force-bearing area of the first piston 157 is reduced, and under the condition that the force-bearing size is not changed, the pressure is increased, and a larger braking force can be provided for the wheel cylinder 21.
Referring to FIG. 4, in the third braking mode, the driver demand for brake pressure is greatest. At this time, the forward control valve 27 and the third isolation valve 53 are opened and communicated, the reverse control valve 29, the second isolation valve 52 and the relief valve 37 are closed and disconnected, the liquid inlet valve 19 is communicated with the second cylinder 15 and disconnected from the first cylinder 13, the driver continues to step on the input device 11 in the second braking mode, the driving element 17 is started and reversely rotated to push the first piston 157 to move rightwards, the brake liquid is input into the second cavity 154 of the second cylinder 15 from the oil tank 12 through the fifth one-way valve 35 and then reaches the wheel cylinder 21 through the forward control valve 27, the third isolation valve 53 and the liquid inlet valve 19, and braking is realized. In this mode, after the pressure in the wheel cylinder 21 is built by moving the first piston 157 leftward in the second brake mode, the pressure in the wheel cylinder 21 is continuously built by controlling the first piston 157 to move rightward, so that the braking force can be further increased, and a larger braking force demand can be met.
Referring to fig. 5, the electric control hydraulic brake system according to another embodiment of the present invention has a structure similar to that of the electric control hydraulic brake system shown in fig. 1, except that the second isolation valve 52 is designed as a seventh check valve which allows only brake fluid to flow to the inlet port of the reverse control valve 29. Other structures of the embodiment are basically the same as those of the electrically controlled hydraulic brake system shown in fig. 1, and are not described again here. Replacing the second isolation valve 52 with the seventh check valve 58 reduces manufacturing costs.
According to the electric control hydraulic braking system, through the design of the oil way, four braking modes, namely a first braking mode, a second braking mode, a third braking mode and a mechanical backup mode, can meet the braking requirement when electric control fails and the system reliability is high, can meet various different braking force requirements, and can meet the requirement on the braking system in current intelligent driving; and the system has high integration level, light weight, relatively low cost and obvious product advantages.
In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on," "disposed on" or "located on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.
In this document, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms can be understood in a specific case to those of ordinary skill in the art.
In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc., indicate the orientation or weight relationship based on the orientation or weight relationship shown in the drawings, only for the sake of clarity and descriptive convenience of the technical solution, and thus should not be construed as limiting the present invention.
As used herein, the ordinal adjectives "first", "second", etc., used to describe an element are merely to distinguish between similar elements and do not imply that the elements so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
As used herein, the meaning of "a plurality" or "a plurality" is two or more unless otherwise specified.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. An electronically controlled hydraulic brake system, comprising:
a fuel tank (12);
a first cylinder (13) connected to the oil tank (12);
a second cylinder (15) connected to the oil tank (12), the second cylinder (15) comprising a first chamber (152), a second chamber (154) and a first piston (157), the first chamber (152) and the second chamber (154) being located on either side of the first piston (157), respectively;
a drive (17) connected to the second cylinder (15) to drive the first piston (157) to move in the second cylinder (15) in a first direction or a second direction opposite to the first direction;
a liquid inlet valve (19);
a wheel cylinder (21) connected to the liquid inlet valve (19);
a first fluid path (23) connected between the first cylinder (13) and the fluid inlet valve (19);
a first isolation valve (47) provided on the first liquid path (23) to connect or disconnect the first cylinder (13) and the liquid intake valve (19); and
a second liquid path (25) disposed between the second cylinder (15) and the liquid inlet valve (19), the second liquid path (25) being provided with a forward control valve (27), a reverse control valve (29), a sixth check valve (49) and a third isolation valve (53), the reverse control valve (29) being connected between the first chamber (152) and the liquid inlet valve (19), the forward control valve (27) being connected between the second chamber (154) and the liquid inlet valve (19), the second chamber (154) being communicated with the liquid outlet of the reverse control valve (29), the forward control valve (27) and the reverse control valve (29) being open-close valves, the sixth check valve (49) being disposed between the liquid outlet of the reverse control valve (29) and the liquid outlet of the forward control valve (27) being provided with a liquid outlet allowing oil to flow from the forward control valve (27) to the reverse control valve (29), the third isolation valve (53) is arranged between the forward control valve (27) and the liquid inlet valve (19) to disconnect or connect the forward control valve (27) and the liquid inlet valve (19), the first liquid path (23) comprises two sub-oil paths, and each sub-oil path is provided with one first isolation valve (47);
the liquid inlet valve (19) comprises a first liquid inlet valve (192), a second liquid inlet valve (193), a third liquid inlet valve (194) and a fourth liquid inlet valve (195), the wheel cylinder (21) comprises a first wheel cylinder (212), a second wheel cylinder (213), a third wheel cylinder (214) and a fourth wheel cylinder (215), a liquid inlet of the first wheel cylinder (212) is connected with a liquid outlet of the first liquid inlet valve (192), a liquid inlet of the second wheel cylinder (213) is connected with a liquid outlet of the second liquid inlet valve (193), a liquid inlet of the third wheel cylinder (214) is connected with a liquid outlet of the third liquid inlet valve (194), a liquid inlet of the fourth wheel cylinder (215) is connected with a liquid outlet of the fourth liquid inlet valve (195), one of the sub-oil passages and the reverse control valve (29) is connected with liquid inlets of the first liquid inlet valve (192) and the second liquid inlet valve (193), the other sub oil circuit and the forward control valve (27) are connected to the third liquid inlet valve (194) and the fourth liquid inlet valve (195);
automatically controlled hydraulic braking system still includes second isolation valve (52), second isolation valve (52) are located the inlet of reverse control valve (29) with to forward control valve (27) between the liquid outlet of reverse control valve (29), just second isolation valve (52) connect in sixth check valve (49) with to forward between control valve (27), second isolation valve (52) allow the brake fluid flow direction of the inlet of reverse control valve (29) to the liquid outlet of forward control valve (27) the inlet of reverse control valve (29), and do not allow the liquid outlet of forward control valve (27) the brake fluid flow direction of the inlet of reverse control valve (29).
2. An electrically controlled hydraulic brake system according to claim 1, characterized in that it comprises a first brake mode, in which the forward control valve (27) is closed, the second chamber (154) is disconnected from the outlet of the reverse control valve (29), the sixth non-return valve and the third isolating valve (53) are open, the first chamber (152) is in communication with the inlet valve (19), and a mechanical back-up mode, in which the drive member (17) drives the first piston (157) towards the first direction; in the second braking mode, the forward control valve (27), the reverse control valve (29), the sixth one-way valve and the third isolation valve (53) are open, the second chamber (154) is in communication with the liquid outlet of the reverse control valve (29), the first chamber (152) is in communication with the liquid inlet valve (19), and the driving member (17) drives the first piston (157) to move in the first direction; in the third braking mode, the forward control valve (27), the sixth one-way valve and the third isolation valve (53) are open, the second chamber (154) is communicated with the liquid outlet of the reverse control valve (29), the reverse control valve (29) is closed, the first chamber (152) is disconnected from the liquid inlet valve (19), and the driving member (17) drives the first piston (157) to move towards the second direction; in the mechanical back-up mode, the first cylinder (13) is in communication with the intake valve (19).
3. An electrically controlled hydraulic brake system according to claim 1, characterised in that the second isolation valve (52) is a switch valve or a non-return valve.
4. The electro-hydraulic brake system as defined in claim 1, wherein the first intake valve (192), the second intake valve (193), the third intake valve (194), and the fourth intake valve (195) are connected in parallel with a first check valve (196), a second check valve (197), a third check valve (198), and a fourth check valve (199), respectively;
the electronic control hydraulic brake system further comprises a liquid outlet valve (32), wherein the liquid outlet valve (32) comprises a first liquid outlet valve (322), a second liquid outlet valve (323), a third liquid outlet valve (324) and a fourth liquid outlet valve (325), the first liquid outlet valve (322) is connected between the first wheel cylinder (212) and the oil tank (12), the second liquid outlet valve (323) is connected between the second wheel cylinder (213) and the oil tank (12), the third liquid outlet valve (324) is connected between the third wheel cylinder (214) and the oil tank (12), and the fourth liquid outlet valve (325) is connected between the fourth wheel cylinder (215) and the oil tank (12).
5. An electrically controlled hydraulic brake system according to claim 1, characterized in that the oil tank (12) is connected to the first chamber (152) and the second chamber (154) of the second cylinder (15), respectively, a first check valve (196) is provided between the oil tank (12) and the first chamber (152), a fifth check valve (35) and a relief valve (37) are connected in parallel between the oil tank (12) and the second chamber (154), and the relief valve (37) is used for connecting or disconnecting the connection between the oil tank (12) and the second chamber (154).
6. An electrically controlled hydraulic brake system according to claim 1, characterized in that the system further comprises an input device (11), the first cylinder (13) comprising a second piston (130) and a third piston (131), the first cylinder (13) being divided into a third chamber (132) and a fourth chamber (134) by the second piston (130), the input device (11) being connected to the third piston (131), the third piston (131) being arranged in the fourth chamber (134), the input device (11) being adapted to urge the third piston (131) to move in the first cylinder (13).
7. An electrically controlled hydraulic brake system according to claim 6, further comprising a test valve (38), said test valve (38) being connected between said tank (12) and said fourth chamber (134) of said first cylinder (13) for connecting or disconnecting said tank (12) and said fourth chamber (134) of said first cylinder (13).
8. An electro-hydraulic brake system according to claim 6, further comprising a pedal simulator (43) provided at the input device (11), the pedal simulator (43) being connected to the fourth chamber (134) of the first cylinder (13), the fourth chamber (134) being pressurized by the pedal simulator (43) when oil is output.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011308033.4A CN112389401B (en) | 2020-11-19 | 2020-11-19 | Electric control hydraulic braking system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011308033.4A CN112389401B (en) | 2020-11-19 | 2020-11-19 | Electric control hydraulic braking system |
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| CN112389401A CN112389401A (en) | 2021-02-23 |
| CN112389401B true CN112389401B (en) | 2021-07-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112606807B (en) * | 2020-12-17 | 2023-05-30 | 上海拿森汽车电子有限公司 | Electric control hydraulic braking system |
| CN115107716A (en) * | 2022-08-12 | 2022-09-27 | 炯熠电子科技(苏州)有限公司 | Braking system |
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| US20090095929A1 (en) * | 2007-10-11 | 2009-04-16 | Mando Corporation | Solenoid valve for brake system |
| CN107042816A (en) * | 2015-11-19 | 2017-08-15 | 株式会社万都 | Electric brake system |
| CN107757589A (en) * | 2016-08-16 | 2018-03-06 | 株式会社万都 | Electric brake system |
| CN109552293A (en) * | 2017-09-25 | 2019-04-02 | 株式会社万都 | Electric brake system and working method |
| CN110406509A (en) * | 2018-04-26 | 2019-11-05 | 株式会社万都 | Electric brake system and its working method |
| CN110758365A (en) * | 2019-12-09 | 2020-02-07 | 宁泓(深圳)汽车科技有限公司 | Integrated brake-by-wire system for vehicle |
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2020
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|---|---|---|---|---|
| US20090095929A1 (en) * | 2007-10-11 | 2009-04-16 | Mando Corporation | Solenoid valve for brake system |
| CN107042816A (en) * | 2015-11-19 | 2017-08-15 | 株式会社万都 | Electric brake system |
| CN107757589A (en) * | 2016-08-16 | 2018-03-06 | 株式会社万都 | Electric brake system |
| CN109552293A (en) * | 2017-09-25 | 2019-04-02 | 株式会社万都 | Electric brake system and working method |
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