CN112937532A - Electro-hydraulic servo brake system with pedal simulator - Google Patents

Electro-hydraulic servo brake system with pedal simulator Download PDF

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Publication number
CN112937532A
CN112937532A CN202110448493.5A CN202110448493A CN112937532A CN 112937532 A CN112937532 A CN 112937532A CN 202110448493 A CN202110448493 A CN 202110448493A CN 112937532 A CN112937532 A CN 112937532A
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CN
China
Prior art keywords
push rod
brake
pedal
hydraulic
valve
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.)
Pending
Application number
CN202110448493.5A
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Chinese (zh)
Inventor
沈建州
丁能根
邓伟文
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Nanjing Jingweida Automobile Technology Co ltd
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Nanjing Jingweida Automobile Technology Co ltd
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Publication date
Application filed by Nanjing Jingweida Automobile Technology Co ltd filed Critical Nanjing Jingweida Automobile Technology Co ltd
Priority to CN202110448493.5A priority Critical patent/CN112937532A/en
Publication of CN112937532A publication Critical patent/CN112937532A/en
Pending legal-status Critical Current

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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
    • B60T13/142—Systems with master cylinder
    • B60T13/147—In combination with distributor valve
    • 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
    • B60T13/745—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 acting on a hydraulic system, e.g. a master cylinder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • 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
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • 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

Abstract

The invention discloses an electro-hydraulic servo brake system with a pedal simulator, which comprises: the brake system comprises a shell, a brake pedal, a pushing mechanism driven by the brake pedal, a brake mechanism driven by the pushing mechanism to realize braking, a brake pipeline hydraulic valve actively controlled by the pushing mechanism and a pedal simulator used for simulating the feeling of the brake pedal. The flow direction of brake fluid in a brake pipeline between a push rod piston cavity and a liquid storage tank is adjusted through a hydraulic valve, due to the incompressibility and the flowability of the brake fluid, in the process that a driver steps on or releases a brake pedal, the brake fluid flows in the push rod piston cavity, a first piston cavity, a second piston cavity and the liquid storage tank through the brake pipeline, the pedal damping feeling and the lagging feeling of the brake pedal are simulated, the hydraulic valve is a mechanical valve body, auxiliary electric control equipment does not need to be arranged, and when a system fails, the hydraulic valve effectively avoids the pressure reduction of the brake fluid flowing into the simulator piston cavity and further effectively avoids the incompressibility and the flowability of the brake fluid.

Description

Electro-hydraulic servo brake system with pedal simulator
Technical Field
The invention belongs to the technical field of automobile braking, and particularly relates to an electro-hydraulic servo braking system with a pedal simulator.
Background
The brake system is an important component of motor vehicles such as automobiles, and most of the existing passenger vehicles use the hydraulic brake system. At present, most of hydraulic brake systems of passenger vehicles adopt vacuum boosters, and drivers are used to the brake pedal feeling of the vacuum boosters.
With the development of the automotive industry, more and more driving assistance (ADAS) functions are applied, and the conventional vacuum booster cannot meet the demand of ADAS for active braking. In recent years, electronic power-assisted brake products have appeared, and Electronic Hydraulic Brake Systems (EHBs) have been developed on the basis of conventional hydraulic brakes. The control mechanism is an electronic brake pedal which replaces the traditional hydraulic brake pedal, and a bulky vacuum booster is eliminated. The integrated electronic pedal sensor can accurately sense the weight and the urgency of a control pedal of a driver, converts the weight and the urgency into electric signals and transmits the electric signals to the electronic control unit, the high-pressure hydraulic control unit can automatically adjust the brake pressure of wheels according to different driving conditions, the power-assisted brake function of the traditional vacuum booster is achieved, active brake can be achieved, the system shortens the reaction time, and the danger that the brake force is unconsciously reduced by the driver due to vibration caused by the action counter force of the hydraulic mechanical brake system is avoided.
At present, electronic hydraulic braking system on the market all has the brake pedal simulator, still be equipped with the solenoid valve in electronic hydraulic braking system, realize hydraulic pressure's active control and regulation, and the pedal simulator adopts the structure of spring or spring and rubber integrated configuration mostly, the elasticity that utilizes the spring realizes that driver foot brake pedal feels, feel the difference great with traditional vacuum booster's brake pedal, do not have good damping and hysteresis, the driver is lower to the recognition degree that brake pedal felt, unsatisfied driver's demand.
Therefore, in order to solve the above-mentioned technical problems, it is necessary to design an electro-hydraulic servo brake system with a pedal simulator that can achieve a good brake pedal feel.
Disclosure of Invention
The invention aims to provide an electro-hydraulic servo brake system with a pedal simulator, which has a simple structure and good pedal damping feeling and driver brake pedal feeling.
The technical scheme of the invention is as follows:
an electro-hydraulic servo brake system with a pedal simulator, comprising:
the simulator comprises a shell, a piston rod;
a brake pedal installed at the left side of the housing;
the pushing mechanism driven by the brake pedal comprises a pedal push rod and an electric control push rod, wherein the pedal push rod is slidably installed in the push rod piston cavity, the left end of the pedal push rod is connected with the brake pedal, the right end of the pedal push rod extends into the electric control push rod, the electric control push rod is slidably installed in the cavity, and a gap is formed between the pedal push rod and the electric control push rod;
the brake mechanism is driven by the pushing mechanism to realize braking and comprises a main cylinder ejector rod and a brake main cylinder, wherein the left end of the main cylinder ejector rod extends into the electric control push rod, the right end of the main cylinder ejector rod is connected with a piston of the brake main cylinder, when a driver steps on a brake pedal, the right end of the main cylinder ejector rod overcomes a gap between the pedal push rod and the electric control push rod, rigid contact is realized to enable the main cylinder ejector rod to move linearly so as to push the piston of the brake main cylinder to realize braking, and the brake main cylinder is connected with a liquid storage tank (used for storing brake liquid;
the brake pipeline hydraulic valve is actively controlled by a pushing mechanism, the hydraulic valve is arranged above a push rod piston cavity, the right end of the hydraulic valve is contacted with the left end of an electric control push rod, the hydraulic valve comprises a valve core, a push rod shifting fork and a valve core push rod, the push rod shifting fork is arranged at the right end of the hydraulic valve, the right end of the push rod shifting fork is contacted with the electric control push rod (the right end of the push rod shifting fork penetrates through a shell and abuts against the left end face of the electric control push rod), the top end of the push rod shifting fork is riveted with the right end of the valve core push rod, a hydraulic cavity is formed in the hydraulic valve, the valve core is slidably arranged in the hydraulic cavity, the left end of the valve core push rod extends into the hydraulic cavity and is connected with the valve core, an oil outlet is formed in the top of the hydraulic cavity, the valve core is driven by the valve core push rod to slide left and right in the hydraulic cavity so as to be used for opening or closing the channel, when the system fails, the channel is opened, and the push rod piston cavity passes through the brake pipeline and the liquid storage tank, so that brake fluid in the push rod piston cavity can quickly flow into the liquid storage tank so that a brake pedal can be quickly stepped on, and meanwhile, the resistance on the brake pedal is reduced, so that the brake pressure generated by a driver at a brake master cylinder when the driver steps on the brake pedal is improved, and the brake effect is improved; when the system is normally braked, the channel is disconnected, so that the space between the push rod piston cavity and the liquid storage tank is disconnected, and the push rod piston cavity is communicated with the pedal simulator, so that the simulation effect of the brake pedal is realized;
a footboard simulator for simulating brake pedal feels, the footboard simulator is installed in the simulator cavity, first piston chamber and second piston chamber are separated into with the simulator cavity to the simulator piston of footboard simulator, push rod piston chamber passes through the brake pipe and is connected with first piston chamber, second piston chamber passes through the brake pipe and is connected with the liquid storage pot, and brake fluid flows and simulates brake pedal's the sensation of trampling between push rod piston chamber and first piston chamber.
In the technical scheme, a hydraulic valve plug is installed on the left side of the hydraulic valve, a valve core return spring is installed on the hydraulic valve plug, one end of the valve core return spring is connected with a valve core, the right side of the valve core is connected with a valve core push rod, and a valve core push rod return spring is sleeved on the rear side of the valve core push rod.
In the technical scheme, a mounting groove is formed at the right end of the hydraulic valve, the valve core push rod return spring is mounted in the mounting groove, one end of the valve core push rod return spring is connected with the mounting groove, and the other end of the valve core push rod return spring is connected with the top end of the push rod shifting fork so as to be used for pushing the valve core push rod to move to the left side through the valve core push rod return spring under the pushing of the push rod shifting fork to enable the valve core to close the channel.
In the above technical scheme, the brake pipeline connecting the push rod piston cavity and the first piston cavity is a third brake pipeline, a throttle valve and a one-way valve (controlling brake fluid to flow to the first piston cavity only from the push rod piston cavity) are arranged on the third brake pipeline, the throttle valve and the one-way valve are positioned on the pipeline between the pedal simulator and the liquid storage tank to play a role in adjusting damping so as to realize simulation of pedal feeling of the pedal simulator, and the brake pipeline connecting the push rod piston cavity and the liquid storage tank through the pedal simulator is the first brake pipeline.
In the technical scheme, a push rod return spring is sleeved on the outer side of the pedal push rod.
In the technical scheme, an electric control push rod return spring is arranged between the brake master cylinder and the electric control push rod.
In the technical scheme, the right end face of the electric control push rod is in contact with a shaft shoulder in the middle section of the main cylinder ejector rod.
In the above technical scheme, the second piston cavity is internally provided with a simulation spring, one end of the simulation spring is connected with the simulator piston, and the other end of the simulation spring is connected with the inner wall of the second piston cavity.
In the above technical solution, the electro-hydraulic servo brake system further includes:
the pedal displacement sensor is used for acquiring a displacement signal of a brake pedal pressed by a driver;
and the electric control unit is used for calculating the total braking force required by the braking according to the pedal displacement signal, then calculating the braking force required by the electro-hydraulic servo braking system according to the states of the motor and the battery, and controlling the electric control push rod to operate through the motor.
In the technical scheme, one side of the pedal push rod, which is close to the push rod return spring, is provided with the annular piston.
In the technical scheme, the plug of the hydraulic valve is in threaded connection with the interior of the hydraulic valve.
The invention has the advantages and positive effects that:
1. the flow direction of brake fluid in a brake pipeline between a push rod piston cavity and a liquid storage tank is adjusted through a hydraulic valve, and due to incompressibility and fluidity of the brake fluid, the brake fluid flows in the push rod piston cavity, a first piston cavity, a second piston cavity and the liquid storage tank through a first brake pipeline, a second brake pipeline and a third brake pipeline in the process that a driver steps on or releases a brake pedal, so that the pedal damping feeling and the lagging feeling of the brake pedal are simulated.
2. According to the braking system, the flow direction of the brake fluid in the braking pipeline is controlled by the arranged hydraulic valve, so that the braking pressure generated by the brake master cylinder during manual backup braking can be increased, the braking distance of a vehicle is shortened, and the safety performance of the braking system is improved.
3. A push rod and a shifting fork of the hydraulic valve are abutted against an electric control push rod, when the system normally operates, the electric control unit adjusts hydraulic braking power in due time according to the states of a motor and a battery, and the like, and certain hydraulic braking force can still be generated when the system fails, so that the safety and the reliability of the braking system are ensured.
4. A throttle valve is arranged on the brake pipeline, and after a driver looses a brake pedal, under the throttling action of the throttle valve, a damping feeling is generated when the pedal push rod returns to the original position, so that a good pedal hysteresis feeling is simulated.
Drawings
FIG. 1 is a schematic structural view of an electro-hydraulic servo brake system of the present invention (hydraulic valve open state);
FIG. 2 is an enlarged partial view of a hydraulic valve according to the present invention (hydraulic valve open state);
FIG. 3 is a schematic diagram of the electro-hydraulic servo brake system of the present invention (hydraulic valve closed state);
fig. 4 is a partially enlarged view of the hydraulic valve in the present invention (hydraulic valve closed state).
In the figure:
1. brake pedal 2, pedal push rod 3 and push rod return spring
4. Casing 5, electric control push rod 6 and main cylinder ejector rod
7. Electric control push rod return spring 8, brake master cylinder 9 and throttle valve
10. One-way valve 11, hydraulic valve 12 and simulator piston
13. Simulation spring 14, liquid storage tank 15 and first brake pipeline
16. Second brake pipe 17, third brake pipe 18, push rod piston cavity
19. First piston cavity 20, second piston cavity 21, hydraulic valve end cap
22. Valve core return spring 23, valve core 24 and valve core push rod
25. Valve core push rod return spring 26, push rod shifting fork 27 and oil outlet
28. Oil inlet 29, simulator cavity 30, cavity
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of the invention in any way.
Example 1
As shown in the drawings, an electro-hydraulic servo brake system with a pedal simulator of the present invention includes:
a housing 4 in which a rod piston chamber 18, a cavity 30 and a simulator cavity 29 are formed;
a brake pedal 1 mounted on the left side of the housing 4;
the pushing mechanism driven by the brake pedal 1 comprises a pedal push rod 2 and an electric control push rod 5, wherein the pedal push rod 2 is slidably mounted in the push rod piston cavity 18, the left end of the pedal push rod 2 is connected with the brake pedal 1, the right end of the pedal push rod 2 extends into the electric control push rod 5, the electric control push rod 5 is slidably mounted in the cavity 30, and a gap is formed between the pedal push rod 2 and the electric control push rod 5;
the brake mechanism which is driven by the pushing mechanism to realize braking comprises a main cylinder ejector rod 6 and a brake main cylinder 8, wherein the left end of the main cylinder ejector rod 6 extends into an electric control push rod 5, the right end of the main cylinder ejector rod 6 is connected with a piston of the brake main cylinder 8, when a driver steps on a brake pedal 1, the gap between a pedal push rod 2 and the electric control push rod 5 is overcome, rigid contact is carried out to enable the main cylinder ejector rod 6 to move linearly so as to push the piston of the brake main cylinder 8 to realize braking, and the brake main cylinder 8 is connected with a liquid storage tank 14 (used for storing brake liquid) through a brake pipeline;
the brake pipeline hydraulic valve 11 actively controlled by the pushing mechanism, the hydraulic valve 11 is arranged above the push rod piston cavity, the right end of the hydraulic valve is in contact with the left end of the electric control push rod, the hydraulic valve 11 comprises a valve core 23, a push rod shifting fork 26 and a valve core push rod 24, the push rod shifting fork 26 is arranged at the right end of the hydraulic valve 11, the right end of the push rod shifting fork 26 is in contact with the electric control push rod 5 (the right end of the push rod shifting fork 26 penetrates through the shell 4 and abuts against the left end face of the electric control push rod 5), the top end of the push rod shifting fork 26 is riveted with the right end of the valve core push rod 24, a hydraulic cavity is formed in the hydraulic valve 11, the valve core 23 is slidably arranged in the hydraulic cavity, the left end of the valve core push rod 24 extends into the hydraulic cavity and is connected with the valve core 23, an oil outlet 27 is formed, the channel is connected with the liquid storage tank 14 through a brake pipeline, the valve core 23 is driven by the valve core push rod 24 to slide left and right in the hydraulic cavity so as to open or close the channel, when the system fails, the channel is opened, the push rod piston cavity 18 is connected with the liquid storage tank 14 through the brake pipeline, so that brake fluid in the push rod piston cavity 18 can rapidly flow into the liquid storage tank 14, the brake pedal 1 can be rapidly stepped on, and meanwhile, the resistance on the brake pedal 1 is reduced, so that the brake pressure generated by the driver when the driver steps on the brake pedal at the brake master cylinder is improved, and the brake effect is improved; when the system is normally braked, the channel is disconnected, so that the space between the push rod piston cavity 18 and the liquid storage tank is disconnected, and the push rod piston cavity 18 is communicated with the pedal simulator, so that the simulation effect of the brake pedal is realized;
the pedal simulator is used for simulating the braking feeling of the brake pedal 1 and is installed in the simulator cavity 29, the simulator piston 12 of the pedal simulator divides the simulator cavity 29 to form a first piston cavity 19 and a second piston cavity 20, the push rod piston cavity 18 is connected with the first piston cavity 19 through a braking pipeline, the second piston cavity 20 is connected with the liquid storage tank 14 through the braking pipeline, and brake fluid flows between the push rod piston cavity 18 and the first piston cavity 19 to simulate the stepping feeling of the brake pedal (the volume of the second piston cavity 20 is changed along with the volume of the first piston cavity 19, the volume of the second piston cavity 20 is reduced, the brake fluid in the second piston cavity flows to the liquid storage tank, the volume of the second piston cavity is increased, and the brake fluid in the liquid storage tank flows to the second piston cavity).
Further, a hydraulic valve plug 21 is installed on the left side of the hydraulic valve 11, a valve core return spring 22 is installed on the hydraulic valve plug 21, one end of the valve core return spring 22 is connected with a valve core 23, the right side of the valve core 23 is connected with a valve core push rod 24, and a valve core push rod return spring 25 is sleeved on the rear side of the valve core push rod 24.
Further, the right end of the hydraulic valve 11 is formed with an installation groove, the valve core push rod return spring 25 is installed in the installation groove, one end of the valve core push rod return spring 25 is connected with the installation groove, and the other end of the valve core push rod return spring is connected with the top end of the push rod shifting fork 26, so that under the pushing of the push rod shifting fork 26, the valve core push rod 24 is pushed by the valve core push rod return spring 25 to move towards the left side, so that the valve core 23 closes the channel.
Furthermore, the brake pipeline connecting the push rod piston cavity 18 and the first piston cavity 19 is a third brake pipeline 17, a throttle valve 9 and a one-way valve 10 are arranged on the third brake pipeline 17 (the one-way valve 10 controls brake fluid to flow from the push rod piston cavity 18 to the first piston cavity 19 only), the throttle valve 9 and the one-way valve 10 are arranged on a pipeline between the pedal simulator and the liquid storage tank 14 to play a role in adjusting damping so as to simulate the pedal feeling of the pedal simulator, and the brake pipeline connecting the push rod piston cavity 18 and the liquid storage tank 14 through the pedal simulator is the first brake pipeline 15.
Furthermore, a push rod return spring is sleeved outside the pedal push rod 2.
Furthermore, an electric control push rod return spring 7 is arranged between the brake master cylinder 8 and the electric control push rod 5.
Further, the right end face of the electric control push rod 5 is in contact with a shaft shoulder at the middle section of the main cylinder ejector rod 6.
Further, a dummy spring 13 is installed in the second piston chamber 20, and one end of the dummy spring 13 is connected to the simulator piston 12 and the other end is connected to the inner wall of the second piston chamber 20.
The working principle of the electro-hydraulic servo brake system with the pedal simulator is as follows:
as shown in fig. 1 and 2, when the electric hydraulic servo brake system of the present invention is powered off or the electric control power fails, the pre-pressure of the electric control push rod return spring 7 is much greater than the pre-pressure of the spool push rod return spring 25, the pre-pressure of the spool return spring 22, and the sliding friction force of the spool push rod 24, the electric control press rod pushes the push rod fork 26 to compress the spool push rod return spring 25, and further pushes the spool push rod 24 to drive the spool 23 to move toward the hydraulic valve plug 21, so that the oil inlet 28 and the oil outlet 27 are communicated to open the passage, and the hydraulic valve 11 is in a normally open state; when a driver steps on the brake pedal 1, the pedal push rod 2 is pushed to move towards the electric control push rod 5 by overcoming the elastic force of the push rod return spring 3, at the moment, brake fluid in the push rod piston cavity 18 directly flows into the liquid storage tank 14 through the first brake pipeline 15, the brake fluid cannot flow into the first piston cavity 19 through the third brake pipeline 17 because the hydraulic valve 11 is in an open state, the brake fluid needs to flow into the second piston cavity 20 from the liquid storage tank 14 through the second brake pipeline 16 and then enters the first piston cavity 19, and the brake fluid needs to overcome the elastic force of the simulation spring 13 and push the simulator piston 12 to move; after the pedal push rod 2 continues to move forwards to overcome the gap between the pedal push rod and the main cylinder ejector rod 6, the pedal push rod directly pushes the main cylinder after rigid contact, and then pushes the brake main cylinder 8 piston to output brake pressure, so that braking is realized.
As shown in fig. 3 and 4, when the electro-hydraulic servo brake system is in a normal boosting state, a driver steps on the brake pedal 1 to make the pedal push rod 2 generate a small displacement, the electric control push rod 5 overcomes the elastic force of the return spring to move a displacement Δ towards the brake master cylinder 8, meanwhile, the electric control push rod 5 drives the master cylinder push rod 6 to push the piston displacement Δ of the brake master cylinder 8, the displacement Δ is smaller than the idle stroke of the piston of the brake master cylinder 8, and at this time, the brake master cylinder 8 does not generate brake pressure.
Meanwhile, the force acting on the push rod shifting fork 26 disappears, the valve core push rod 24 moves towards the direction of the electric control push rod 5 under the action force of the valve core push rod return spring 25, the valve core push rod 24 drives the valve core 23 to return to the original position, the valve core 23 seals the channel, and the hydraulic valve 11 is closed and changed into a normally closed one-way valve 10 state (at the moment, brake fluid cannot flow to the oil outlet 27 through the oil inlet 28);
then the pedal push rod 2 continues to move towards the direction of the brake master cylinder 8, brake fluid in the push rod piston cavity 18 flows into the first piston cavity 19 through the third brake pipeline 17, so that the simulator piston 12 is pushed to compress the simulation spring 13 and moves towards the second piston cavity 20, the brake fluid in the second piston cavity 20 flows into the liquid storage tank 14 through the second brake pipeline 16, and the pedal push rod 2 generates damping feeling through deformation of a plurality of elastic pieces and return springs and flowing of the brake fluid, so that better pedal damping feeling is simulated.
The driver releases the brake pedal 1, so that the acting force on the pedal push rod 2 is reduced, the force acting on the simulator piston 12 is smaller than the elastic force of the simulation spring 13, the simulator piston 12 returns to the original position under the action of the simulation spring 13, the brake fluid in the first piston cavity 19 flows through the third brake pipeline 17 (at the moment, the one-way valve 10 is closed, the brake fluid slowly flows back to the push rod piston cavity 18 through the throttle valve 9), the brake fluid flows back to the second piston cavity 20 through the second brake pipeline 16, and due to the throttling action of the throttle valve 9, hysteresis is generated when the pedal push rod 2 returns to simulate a better pedal hysteresis feeling.
The flow direction of brake fluid in a brake pipeline between the push rod piston cavity 18 and the liquid storage tank 14 is adjusted through the hydraulic valve 11, and due to incompressibility and fluidity of the brake fluid, the brake fluid flows in the push rod piston cavity 18, the first piston cavity 19, the second piston cavity 20 and the liquid storage tank 14 through the first brake pipeline 15, the second brake pipeline 16 and the third brake pipeline 17 in the process that a driver steps on or releases the brake pedal 1, so that the pedal damping feeling and the hysteresis feeling of the brake pedal 1 are simulated.
Example 2
On the basis of embodiment 1, the electro-hydraulic servo brake system further includes:
the pedal displacement sensor is used for acquiring a displacement signal of a driver for stepping on the brake pedal 1;
and the electric control unit is used for calculating the total braking force required by the braking according to the pedal displacement signal, then calculating the braking force required by the electro-hydraulic servo braking system according to the states of the motor and the battery, and controlling the electric control push rod 5 to operate through the motor.
After a driver steps on the brake pedal 1, the pedal displacement sensor acquires a displacement signal of the brake pedal 1, and sends an operation instruction and a movement stroke of the electric control push rod 5 to the electric control push rod 5 through the electric control unit so as to judge the piston displacement of a brake master cylinder 8 of the electro-hydraulic servo brake system and judge whether the brake master cylinder 8 generates brake pressure.
When the electro-hydraulic servo brake system fails, the brake pedal 1 and the brake master cylinder 8 can be mechanically connected through the hydraulic valve 11, the risk of system failure is effectively reduced, compared with the electromagnetic valve adopted in the prior art, the safety is effectively improved by using the mechanical connection mode of the hydraulic valve 11, and the brake system is stable and good in safety.
Example 3
On the basis of the embodiment 2, an annular piston is arranged on one side of the pedal push rod 2 close to the push rod return spring 3.
Further, the hydraulic valve plug 21 is screwed in the hydraulic valve 11.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.

Claims (10)

1. An electro-hydraulic servo brake system with a pedal simulator, comprising:
the simulator comprises a shell, a piston rod;
a brake pedal installed at the left side of the housing;
the pushing mechanism driven by the brake pedal comprises a pedal push rod and an electric control push rod, wherein the pedal push rod is slidably installed in the push rod piston cavity, the left end of the pedal push rod is connected with the brake pedal, the right end of the pedal push rod extends into the electric control push rod, the electric control push rod is slidably installed in the cavity, and a gap is formed between the pedal push rod and the electric control push rod;
the brake mechanism is driven by the pushing mechanism to realize braking and comprises a main cylinder ejector rod and a brake main cylinder, wherein the left end of the main cylinder ejector rod extends into the electric control push rod, the right end of the main cylinder ejector rod is connected with a piston of the brake main cylinder, when a driver steps on a brake pedal, the gap between the pedal push rod and the electric control push rod is overcome, the rigid contact enables the main cylinder ejector rod to move linearly to push the piston of the brake main cylinder to realize braking, and the brake main cylinder is connected with the liquid storage tank through a brake pipeline;
a brake pipeline hydraulic valve actively controlled by the pushing mechanism, the hydraulic valve is arranged above the push rod piston cavity, the right end of the hydraulic valve is contacted with the left end of the electric control push rod, the hydraulic valve comprises a valve core, a push rod shifting fork and a valve core push rod, the push rod shifting fork is arranged at the right end of the hydraulic valve, the right end of the push rod shifting fork is contacted with the electric control push rod, the top end of the push rod shifting fork is riveted with the right end of the valve core push rod, a hydraulic cavity is formed in the hydraulic valve, the valve core is slidably arranged in the hydraulic cavity, the left end of the valve core push rod extends into the hydraulic cavity and is connected with the valve core, the top of the hydraulic cavity is provided with an oil outlet, the bottom of the hydraulic cavity is provided with an oil inlet, the oil outlet, the oil inlet and the hydraulic cavity form a channel, the channel is connected with the liquid storage tank through a brake pipeline, and the valve core is driven by the valve core push rod to slide left and right in the hydraulic cavity so as to open or close the channel;
a footboard simulator for simulating brake pedal feels, the footboard simulator is installed in the simulator cavity, the simulator piston of footboard simulator separates the simulator cavity and forms first piston chamber and second piston chamber, push rod piston chamber passes through the brake pipe and is connected with first piston chamber, second piston chamber passes through the brake pipe and is connected with the liquid storage pot, and brake fluid flows and simulates brake pedal's the sensation of trampling between push rod piston chamber and first piston chamber.
2. The electro-hydraulic servo brake system of claim 1, wherein: the hydraulic valve comprises a hydraulic valve body, a valve core push rod, a valve core return spring, a valve core push rod and a hydraulic valve plug, wherein the hydraulic valve plug is installed on the left side of the hydraulic valve body, the valve core return spring is installed on the hydraulic valve plug, one end of the valve core return spring is connected with the valve core, the right side of the valve core is connected with the valve core push rod, and the valve core push.
3. The electro-hydraulic servo brake system of claim 2, wherein: the right end of hydrovalve is formed with a mounting groove, case push rod return spring installs in the mounting groove, case push rod return spring's one end is connected with the mounting groove, and the other end is connected with the top of push rod shift fork to be used for under the push of push rod shift fork, through case push rod return push rod propelling case push rod to the left side remove so that the case closes the passageway.
4. The electro-hydraulic servo brake system of claim 3, wherein: the brake pipeline that the push rod piston chamber is connected with first piston chamber is third brake pipeline, is equipped with choke valve and check valve (check valve control brake fluid can only flow to first piston chamber from push rod piston chamber) on this third brake pipeline, choke valve and check valve are located the pipeline between footboard simulator and liquid storage pot, play the effect of adjusting damping to realize the footboard sensation of simulation footboard simulator, the brake pipeline that push rod piston chamber is connected with the liquid storage pot through the footboard simulator is first brake pipeline.
5. The electro-hydraulic servo brake system of claim 4, wherein: and a push rod return spring is sleeved outside the pedal push rod.
6. The electro-hydraulic servo brake system of claim 5, wherein: and an electric control push rod return spring is arranged between the brake main cylinder and the electric control push rod.
7. The electro-hydraulic servo brake system of claim 6, wherein: the right end face of the electric control push rod is in contact with a shaft shoulder at the middle section of the main cylinder ejector rod.
8. The electro-hydraulic servo brake system of claim 7, wherein: and a simulation spring is arranged in the second piston cavity, one end of the simulation spring is connected with the simulator piston, and the other end of the simulation spring is connected with the inner wall of the second piston cavity.
9. The electro-hydraulic servo brake system of claim 8, wherein: the electro-hydraulic servo brake system further comprises:
the pedal displacement sensor is used for acquiring a displacement signal of a brake pedal pressed by a driver;
and the electric control unit is used for calculating the total braking force required by the braking according to the pedal displacement signal, then calculating the braking force required by the electro-hydraulic servo braking system according to the states of the motor and the battery, and controlling the electric control push rod to operate through the motor.
10. The electro-hydraulic servo brake system of claim 9, wherein: and one side of the pedal push rod, which is close to the push rod return spring, is provided with an annular piston.
CN202110448493.5A 2021-04-25 2021-04-25 Electro-hydraulic servo brake system with pedal simulator Pending CN112937532A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110448493.5A CN112937532A (en) 2021-04-25 2021-04-25 Electro-hydraulic servo brake system with pedal simulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110448493.5A CN112937532A (en) 2021-04-25 2021-04-25 Electro-hydraulic servo brake system with pedal simulator

Publications (1)

Publication Number Publication Date
CN112937532A true CN112937532A (en) 2021-06-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110448493.5A Pending CN112937532A (en) 2021-04-25 2021-04-25 Electro-hydraulic servo brake system with pedal simulator

Country Status (1)

Country Link
CN (1) CN112937532A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113788000A (en) * 2021-10-13 2021-12-14 南京经纬达汽车科技有限公司 Fully-decoupled electro-hydraulic servo brake system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113788000A (en) * 2021-10-13 2021-12-14 南京经纬达汽车科技有限公司 Fully-decoupled electro-hydraulic servo brake system
CN113788000B (en) * 2021-10-13 2022-05-17 南京经纬达汽车科技有限公司 Fully-decoupled electro-hydraulic servo brake system

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