CN114604216B - Chassis integrated braking system - Google Patents
Chassis integrated braking system Download PDFInfo
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- CN114604216B CN114604216B CN202210503542.5A CN202210503542A CN114604216B CN 114604216 B CN114604216 B CN 114604216B CN 202210503542 A CN202210503542 A CN 202210503542A CN 114604216 B CN114604216 B CN 114604216B
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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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- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a chassis integrated braking system. Comprises a master cylinder control part for receiving a target pressure signal generated by the control action of external braking in real time and transmitting the target pressure signal to a pressure execution part; the hydraulic braking control system comprises a pressure executing part with pressure regulating control, a master cylinder control part and a hydraulic control part, wherein the pressure executing part is used for receiving a target pressure signal from the master cylinder control part in real time, simultaneously monitoring the pressure of an oil way in the hydraulic control part in real time to generate a monitoring pressure signal, and combining the target pressure signal and the monitoring pressure signal to carry out pressure regulating control so as to execute braking. The invention reduces the manufacturing cost of the braking system, avoids the problems of overhigh and fluctuation of the braking oil pressure, and realizes accurate pressure regulation and stable pressure regulation of the braking oil pressure.
Description
Technical Field
The invention belongs to an intelligent driving electronic brake control system of an automobile, and particularly relates to a chassis integrated brake system of a brake master cylinder in an electric brake system of the automobile and a related control method.
Background
Under the big environment of the vigorous development of new energy automobiles, the automobiles are developing from the traditional power of internal combustion engines to the directions of hybrid power and pure electric driving. In order to solve the problem that a vacuum source does not exist in the braking process of an automobile losing the power of the traditional internal combustion engine to provide vacuum assistance for a brake master cylinder, the traditional electric automobile or the hybrid electric automobile can be additionally provided with a vacuum pump serving as the vacuum source on the traditional booster. The method increases the cost on one hand and increases the unavoidable working noise of the vacuum pump on the other hand.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a chassis integrated braking system which can rapidly, efficiently and accurately control the braking force of each wheel cylinder at a temperature, and can achieve the effect of rapid pressure increase in a specified time, thereby realizing the function of rapidly and accurately controlling the pressure of the wheel cylinder. The brake system is extremely fast in response by providing brake fluid pressure to the brake system with the accumulator after the high pressure accumulator is filled with high pressure brake fluid.
The technical scheme of the invention is as follows:
comprises a master cylinder control part for receiving a target pressure signal generated by the control action of external braking in real time and transmitting the target pressure signal to a pressure execution part;
the hydraulic braking control system comprises a pressure executing part with pressure regulating control, a master cylinder control part and a hydraulic control part, wherein the pressure executing part is used for receiving a target pressure signal from the master cylinder control part in real time, simultaneously monitoring the pressure of an oil way in the hydraulic control part in real time to generate a monitoring pressure signal, and combining the target pressure signal and the monitoring pressure signal to carry out pressure regulating control so as to execute braking.
The master cylinder control part specifically comprises:
the device comprises a liquid storage module for storing oil;
the brake master cylinder comprises a brake master cylinder body, wherein a cavity communicated with a liquid storage module is arranged in the brake master cylinder body, and a piston in the cavity is synchronously connected with a pedal;
the brake pedal comprises a pedal displacement sensor, a brake pedal control unit and a brake pedal, wherein the pedal displacement sensor is arranged at a pedal and used for monitoring the moving distance of the pedal in real time and used for backing up as a brake intention signal;
the brake master cylinder comprises a simulator pressure sensor, a pressure executing part and a control part, wherein the simulator pressure sensor is connected to a chamber of the brake master cylinder and used for monitoring the oil pressure in the chamber in real time and then sending feedback to the pressure executing part;
comprises a simulator component connected to a chamber of the brake master cylinder for sensing oil pressure in the chamber of the brake master cylinder and generating elastic feedback force to react on the piston and the pedal.
Two chambers which are communicated with the liquid storage module and are adjacently arranged in sequence are arranged in the cylinder body of the brake master cylinder, wherein one chamber is connected with the pedal through a piston and is used as a first chamber, and the other chamber is used as a second chamber;
the simulator pressure sensor is connected to the first chamber or the second chamber of the brake master cylinder and is used for monitoring the oil pressure in the first chamber in real time and then sending feedback to the pressure executing part;
the simulator assembly is connected to the first chamber or the second chamber of the brake master cylinder for sensing the oil pressure in the first chamber of the brake master cylinder and generating an elastically feedback force to apply a reaction force to the piston and pedal of the first chamber.
The simulator component specifically comprises:
the pedal simulator comprises a pedal simulator, wherein a piston is arranged in the pedal simulator, the piston divides an inner cavity of the pedal simulator into two cavities, one cavity is a pedal simulation cavity, a spring is arranged in the other cavity, and the piston is elastically connected with the inner side wall of the inner cavity of the pedal simulator;
the brake master cylinder comprises a simulator valve, a brake master cylinder cavity and a pedal simulation cavity, wherein the simulator valve is connected between the brake master cylinder cavity and the pedal simulation cavity and is used for communicating the brake master cylinder cavity with the pedal simulation cavity;
comprises a one-way valve connected between the chamber of the brake master cylinder and the pedal simulation chamber for allowing communication only from the pedal simulation chamber to the brake master cylinder chamber.
The pressure executing section:
the hydraulic control system comprises a pressurizing module, a hydraulic control module and a hydraulic control module, wherein the pressurizing module is connected with a master cylinder control part and is used for extracting oil from the master cylinder control part, generating adjustable oil pressure through the pressurizing control module and outputting the oil to the hydraulic control module;
the hydraulic control system comprises a pressurizing control module, a master cylinder control part and a hydraulic control module, wherein the pressurizing control module and the master cylinder control part are respectively connected with the hydraulic control module and are used for adjusting and controlling the oil pressure of the oil output from the pressurizing module to the hydraulic control module;
the hydraulic control system comprises a hydraulic control module, wherein the hydraulic control module is connected between a pressure increasing control module and a brake wheel cylinder and is used for conveying oil under the oil pressure regulated by the pressure increasing module to serve as brake oil to the brake wheel cylinder needing to be braked.
The hydraulic braking system comprises a braking wheel cylinder, a hydraulic control module and a hydraulic control module, wherein the braking wheel cylinder is used for receiving braking oil of the hydraulic control module and generating braking force to realize braking.
The supercharging module comprises a motor and a pump set, wherein the output end of the motor is connected with the control input end of the pump set, the pump set is driven by the motor to work, the oil inlet of the pump set is communicated with the master cylinder control part, and the oil outlet of the pump set is connected with the supercharging control module.
The supercharging control module specifically comprises:
the pressure regulating valve is connected between an oil inlet and an oil outlet of the pressurizing module and is used for returning oil output by the oil outlet of the pressurizing module into the liquid storage module;
the hydraulic control system comprises an oil liquid connecting pipeline which is arranged between an oil outlet of a pressurizing module and a hydraulic control module and is directly connected with the oil outlet of the pressurizing module;
the hydraulic pressure monitoring device comprises a pressure sensor, is arranged on an oil connecting pipeline and is used for monitoring the oil pressure on the oil connecting pipeline in real time and then feeding back to a pressure regulating valve.
The pressure regulating valve is a flow regulating valve and is an electromagnetic valve.
The target oil pressure monitored in real time by the master cylinder control part is combined with the execution oil pressure monitored in real time by the pressure sensor in the pressurizing control module of the pressure execution part to be fed back to the pressure regulating valve, and the opening and closing and the opening degree of the pressure regulating valve are regulated.
The coupling valve assembly is connected between the oil paths of the master cylinder control part and the pressure execution part, and is used for isolating the oil paths of the master cylinder control part and the pressure execution part from oil entering the pressure execution part in the electric control mode; in the non-electric control mode, the oil paths of the master cylinder control part and the pressure execution part are communicated, so that the pressure oil generated by the master cylinder control part is transmitted to the pressure execution part, and the brake oil pressure control is directly performed.
The electric control mode refers to a normal electrified working mode, all valves can be electrified, and brake fluid of a brake master cylinder cannot enter a wheel cylinder in the electrified state and is blocked by an electromagnetic valve.
When the electric control mode of the master cylinder control part and the pressure execution part fails or the mechanical oil way control mode works, all valves are powered off, and the master cylinder control part and the pressure execution part are directly communicated with oil ways to directly communicate the brake master cylinder liquid ways to the brake wheel cylinders.
The coupling valve component is specifically provided with a valve body;
the brake control device comprises a first coupling valve, a second coupling valve and a control valve, wherein the first coupling valve is connected between a first chamber of a brake master cylinder and a pressure executing part and is used for opening and controlling the mechanical oil way communication between the master cylinder control part and the pressure executing part in a mechanical oil way control mode and closing and blocking the mechanical oil way communication between the master cylinder control part and the pressure executing part in an electric control mode;
the brake master cylinder comprises a second coupling valve which is connected between a second chamber of the brake master cylinder and the pressure executing part and is used for opening and controlling the mechanical oil way communication between the master cylinder control part and the pressure executing part in a mechanical oil way control mode and closing and blocking the mechanical oil way communication between the master cylinder control part and the pressure executing part in an electric control mode.
The brake master cylinder further comprises a pipeline arranged between the liquid storage module and the brake master cylinder, so that the brake master cylinder chamber is communicated with the liquid storage module in a limited way.
The motor can adopt a brush motor, a corner position sensor is not required to be arranged, a motor full-bridge control circuit is not required to be arranged, and a transmission mechanism or a speed reducing mechanism is not required to be arranged at a pump part.
In order to solve the problem of slower response of the motor to drive the pump set in the initial pressure building stage, the invention adopts the valve to control the motor and the pump set to convey the brake oil liquid with pressure to directly supply the brake wheel cylinder with liquid, and simultaneously utilizes the medium-pressure accumulator to build pressure cooperatively in the initial pressure building stage, thereby being a novel application and control method in the brake system, and reducing the overall cost of the product while realizing the braking requirement.
The beneficial effects of the invention are as follows:
according to the invention, after the pressure in the wheel cylinder of the brake wheel is controlled to a specific pressure by the linear liquid inlet valve, braking force supplement in an energy recovery state can be realized, and the real-time change of the wheel cylinder pressure in the energy recovery process is realized, so that the energy recovery efficiency is improved. The pressure control mode is more direct, the demand for the system controller is greatly reduced, and the manufacturing cost is reduced. The structure of the pressurizing unit is more compact, so that the whole product has smaller mass and volume. The invention can realize wheel anti-lock and vehicle body stabilization system, and provides a good expansion platform for intelligent driving expansion function.
The invention adopts overflow control of the pump with the valve, greatly reduces the cost and omits other devices and elements which are necessary to be arranged.
Drawings
FIG. 1 is a diagram of the inventive system connection framework of the present invention in an electronically controlled control mode;
FIG. 2 is a diagram of the internal structural connection frame of the boost control module of the present invention;
FIG. 3 is a schematic diagram of the internal oil transfer control of the boost control module of the present invention;
fig. 4 is a schematic diagram of the internal structure of the liquid storage module and the oil circuit transmission thereof according to the present invention.
FIG. 5 is a diagram of a system connection frame after the invention has been added and connected between the reservoir module and the master cylinder and after the valve assembly has been coupled in an electronically controlled mode;
FIG. 6 is a diagram of a system connection frame after the invention has been added and connected between the reservoir module and the master cylinder and after the valve assembly has been coupled in a mechanical oil control mode;
FIG. 7 (a) is a graph showing the target pressure after opening the brake in accordance with the embodiment of the present invention;
fig. 7 (b) is a graph showing the change in the execution pressure with time after the opening brake in which the present invention is embodied.
In the figure: the brake system comprises a pressurizing module 1, a pressurizing control module 2, a liquid storage module 3, a liquid path control module 4, a brake master cylinder 5, a pedal displacement sensor 6, a simulator pressure sensor 7, a pedal simulator 8, a simulator valve 9 and a coupling valve assembly 10; a pressure regulating valve 21 and a pressure sensor 22; a motor 11 and a pump group 12.
PTS in fig. 1 refers to a PTS pedal displacement sensor.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1, the system is specifically:
comprises a master cylinder control part for receiving a target pressure signal generated by the control action of external braking in real time and transmitting the target pressure signal to a pressure execution part;
the hydraulic braking control system comprises a pressure executing part with pressure regulating control, a master cylinder control part and a hydraulic control part, wherein the pressure executing part is used for receiving a target pressure signal from the master cylinder control part in real time, simultaneously monitoring the pressure of an oil way in the hydraulic control part in real time to generate a monitoring pressure signal, and combining the target pressure signal and the monitoring pressure signal to carry out pressure regulating control so as to execute braking.
The brake control system further comprises a controller, wherein the controller receives the analog pressure signal and the monitoring pressure signal of the master cylinder control part, and generates a control signal to control the pressure regulating element of the pressure executing part to regulate the brake oil pressure.
The master cylinder control part comprises a liquid storage module 3, a brake master cylinder 5, a pedal displacement sensor 6, a simulator pressure sensor 7 and a simulator component, and specifically comprises:
the device comprises a liquid storage module 3 for storing oil;
in a specific implementation, the liquid storage module 3 adopts a brake oil cup.
The brake master cylinder comprises a brake master cylinder 5, wherein a cavity communicated with a liquid storage module 3 is arranged in a cylinder body, oil flows into the cavity from the liquid storage module 3, a piston in the cavity is synchronously connected with a pedal of a vehicle, and the cavity of the brake master cylinder 5 is connected with a liquid path control module 4 of a pressure executing part through a coupling valve assembly;
comprises a pedal displacement sensor 6 which is arranged at the pedal of the vehicle and used for monitoring the moving distance and the braking state of the pedal and the piston in real time and backing up the signals as braking intention signals; the pedal displacement sensor is used as a calibration signal for only one pedal, or as a driver braking intention signal, such as sudden braking or slow braking. Meanwhile, after the simulator pressure sensor fails, or the liquid path is leaked, the pressure sensor does not have signals, but whether a driver has a braking intention is detected through the pedal displacement sensor, so that a braking system cannot fail, and the signals of the pedal displacement sensor can be output and sent to the pressure executing part to be used as a backup signal.
A boost control module 2 including a simulator pressure sensor 7 connected to the chamber of the master cylinder 5 for monitoring the oil pressure in the chamber in real time and then feedback-transmitting to the pressure executing part;
comprising a simulator assembly connected to the chamber of the master cylinder 5 for sensing the oil pressure in the chamber of the master cylinder 5 and generating a resilient feedback force, reacting on the piston and pedal.
Two chambers which are communicated with the liquid storage module 3 and are sequentially and adjacently arranged are arranged in the cylinder body of the brake master cylinder 5, the two chambers are separated by another piston, one chamber is connected with the pedal of the vehicle through the piston to serve as a first chamber, and the other chamber is used as a second chamber; the pedal actuation pressure increases by pressing the first chamber oil pressure through the piston, and increases by pressing the second chamber oil pressure.
The simulator pressure sensor 7 is connected to the first chamber of the brake master cylinder 5, and is used for monitoring the oil pressure in the first chamber in real time and then feeding back to the pressurizing control module 2 of the pressure executing part;
the simulator assembly is connected only to the first chamber of the master cylinder 5 for sensing the oil pressure in the first chamber of the master cylinder 5 and generating an elastically feedback force to apply a reaction force to the piston and pedal of the first chamber.
The simulator component specifically comprises:
the device comprises a pedal simulator 8, wherein a piston is arranged in the pedal simulator 8, the piston divides an inner cavity of the pedal simulator 8 into two cavities, one cavity is a pedal simulation cavity, and a spring is arranged in the other cavity and elastically connects the piston with the inner side wall of the inner cavity of the pedal simulator 8;
comprises a simulator valve 9 connected between the chamber of the brake master cylinder 5 and the pedal simulation chamber for communicating the chamber of the brake master cylinder 5 with the pedal simulation chamber; specifically, the simulator valve 9 is closed when the mechanical oil way control mode is adopted, so that oil in the cavity of the brake master cylinder 5 does not enter the pedal simulation cavity, and the simulator valve 9 is opened when the electric control mode is adopted, so that oil in the cavity of the brake master cylinder 5 enters the pedal simulation cavity. The simulator valve 9 is normally closed, i.e. normally not energized, and not conductive.
Comprises a one-way valve connected between the chamber of the brake master cylinder 5 and the pedal simulation chamber for allowing only the communication from the pedal simulation chamber to the chamber of the brake master cylinder 5, preventing the pressure in the pedal simulation chamber from being excessive.
In a specific implementation, the brake oil pressure control device further comprises a coupling valve assembly 10 which is connected between the oil paths of the master cylinder control part and the pressure execution part, and is used for communicating the oil paths of the master cylinder control part and the pressure execution part in an electric control mode, so that pressure oil generated by the master cylinder control part is transferred to the pressure execution part, and further brake oil pressure control is directly carried out.
The coupling valve assembly 10 comprises a first coupling valve and a second coupling valve which are both normally open, namely are conducted under normal state without being electrified, specifically;
the hydraulic control system comprises a first coupling valve, a second coupling valve and a hydraulic control module, wherein the first coupling valve is connected between a first chamber of a brake master cylinder 5 and a hydraulic control module 4 of a pressure execution part and is used for opening and controlling the mechanical oil way communication between the master cylinder control part and the pressure execution part in a mechanical oil way control mode and closing and blocking the mechanical oil way communication between the master cylinder control part and the pressure execution part in an electric control mode;
the second coupling valve is connected between the second chamber of the brake master cylinder 5 and the fluid path control module 4 of the pressure executing part, and is used for opening and controlling the mechanical fluid path communication between the master cylinder control part and the pressure executing part in the mechanical fluid path control mode and closing and blocking the mechanical fluid path communication between the master cylinder control part and the pressure executing part in the electric control mode.
When the mechanical oil circuit control mode is adopted, the coupling valve of the coupling valve assembly 10 and the simulator valve 9 are not electrified, the coupling valve is driven to be conducted and the simulator valve 9 is driven to be non-conducted, so that the mechanical oil circuit between the main cylinder control part and the pressure execution part is communicated, and the chamber of the brake main cylinder and the pedal simulation chamber are not communicated; if the brake pedal is pressed, the piston in the brake master cylinder is driven to move inwards to push the chamber in the brake master cylinder to flow into the pedal simulation chamber, and the chamber can not flow into the liquid path control module 4 through the coupling valve, and the chamber is transferred to flow into each brake wheel cylinder through the liquid path control module 4.
When in the electric control mode, the coupling valve of the coupling valve assembly 10 and the simulator valve 9 are electrified, the coupling valve is driven to be non-conductive and the simulator valve 9 is driven to be conductive, so that a mechanical oil way between the main cylinder control part and the pressure execution part is not communicated, and a chamber of the brake main cylinder is communicated with the pedal simulation chamber; if the brake pedal is pressed down, a piston in the brake master cylinder is driven to move inwards to push a chamber in the brake master cylinder to flow into a pedal simulation chamber, and the chamber cannot flow into the liquid path control module 4 through the coupling valve, and the liquid with the oil pressure generated by the pressure increasing module 1 is transferred and flows into each brake wheel cylinder through the liquid path control module 4.
And a pipeline arranged between the liquid storage module 3 and the brake master cylinder 5, so that the chamber of the brake master cylinder 5 is communicated with the liquid storage module 3 in a limited way. When the pressure of the chamber of the brake master cylinder 5 is increased beyond a threshold value, the chamber of the brake master cylinder 5 is not communicated with the liquid storage module 3; otherwise, the communication is performed. Thus, the oil return device is used for oil in the chamber of the brake master cylinder 5, and the working of the chamber of the brake master cylinder 5 is not affected.
In a specific implementation, the chamber of the brake master cylinder 5 is divided into a first chamber and a second chamber, and the first chamber and the second chamber of the brake master cylinder 5 are connected with the liquid storage module 3 through a pipeline respectively.
The pressure executing part comprises a pressure increasing module 1, a pressure increasing control module 2, a liquid path control module 4 and a brake wheel cylinder:
the hydraulic control system comprises a pressurizing module 1, a hydraulic control module 4 and a hydraulic control module 2, wherein the pressurizing module 1 is connected with a liquid storage module 3 of a master cylinder control part and is used for pumping oil from the liquid storage module 3 of the master cylinder control part, generating adjustable oil pressure through the pressurizing control module 2 and outputting the oil to the hydraulic control module 4;
the hydraulic brake system comprises a pressurizing control module 2, wherein a liquid storage module 3 of a pressurizing module 1 and a master cylinder control part is respectively connected with a liquid path control module 4 and is used for adjusting and controlling the pressure of oil output from the pressurizing module 1 to the liquid path control module 4, namely adjusting the pressure of the oil at the input end of the liquid path control module 4, namely obtaining brake oil pressure;
the connecting oil way pipeline between the pressurizing module 1 and the liquid storage module 3 is different from the connecting oil way pipeline between the pressurizing control module 2 and the liquid storage module 3, and is a pipeline which is not communicated with each other and is independent.
The hydraulic control system comprises a hydraulic control module 4, a brake wheel cylinder and a hydraulic control module, wherein the hydraulic control module 4 is connected between the pressure increasing control module 2 and the brake wheel cylinder and is used for conveying oil under the oil pressure regulated by the pressure increasing module 1 as brake oil to the brake wheel cylinder needing braking;
the hydraulic braking system comprises a brake wheel cylinder which is used for receiving brake oil of the hydraulic control module 4 and generating braking force to realize braking. The brake fluid flows into the brake cylinders of the brake cylinder cylinders.
As shown in fig. 4, the pressurizing module 1 comprises a motor 11 and a pump set 12, wherein an output end of the motor 11 is connected with a control input end of the pump set 12, the pump set 12 is driven by the motor 11 to work, an oil inlet of the pump set 12 is communicated with the liquid storage module 3 of the master cylinder control part, and an oil outlet of the pump set 12 is connected with the pressurizing control module 2.
The pump unit 12 is embodied as, but not limited to, a gear pump or a plunger pump.
As shown in fig. 2, the pressurization control module 2 includes a pressure regulating valve 21 and a pressure sensor 22, specifically:
the hydraulic control system comprises a pressure regulating valve 21, a hydraulic control valve and a hydraulic control valve, wherein the pressure regulating valve is connected between an oil inlet and an oil outlet of a pump group 12 of a pressurizing module 1, namely between a liquid storage module 3 connected with a master cylinder control part and the oil outlet of the pump group 12 of the pressurizing module 1, and is used for returning oil output by the oil outlet of the pressurizing module 1 into the liquid storage module 3 so as to assist in regulating the pressure of the oil output by the oil outlet of the pressurizing module 1;
the hydraulic control system comprises an oil liquid connecting pipeline which is arranged between an oil outlet of a pump group 12 of the pressurizing module 1 and the liquid path control module 4 and is directly connected;
the hydraulic control system comprises a pressure sensor 22, is arranged on an oil connecting pipeline connected between an oil outlet of a pump group 12 of the pressurizing module 1 and the hydraulic control module 4, and is used for monitoring the oil pressure on the oil connecting pipeline in real time and feeding back the oil pressure to a pressure regulating valve 21.
The target oil pressure in the cavity of the brake master cylinder 5, which is monitored in real time by the simulator pressure sensor 7 of the master cylinder control part, is combined with the execution oil pressure, which is monitored in real time by the pressure sensor 22 in the pressurizing control module 2 of the pressure execution part, to be fed back to the pressure regulating valve 21, so as to regulate the opening and closing of the pressure regulating valve 21, realize hydraulic line control braking and realize rapid, efficient and accurate braking oil pressure control.
The motor 11 drives the pump set 12 to work and output oil pressurization and the oil pressure signal collected by the pressure sensor 21 adjusts the opening of the pressure regulating valve 21 to control the pressure of the motor pump liquid.
Especially when the system needs braking force, the pressurizing unit drives the pump group to provide continuous braking liquid with pressure for braking according to the braking force actually needed by the current braking, so as to meet the braking requirement, and the pressure maintaining performance of the regulating valve is utilized.
The invention is mainly characterized in that the pressurizing control module 2 with the pressure regulating valve 21 and the pressure sensor 22 is additionally arranged between the pressurizing module 1, the liquid storage module 3 and the liquid path control module 4, so that the problems of overhigh and fluctuation of brake oil pressure are avoided, the accurate pressure regulation and the stable pressure regulation of the brake oil pressure are realized, and the invention can also be used for solving the problem of ABS locking.
As shown in fig. 1, in the case of the mechanical oil path control mode, when the brake pedal is first stepped on by the driver, the coupling valve of the coupling valve assembly is not energized, so that the coupling valve is opened and conducted, the oil path between the master cylinder control portion and the pressure executing portion is connected, and the pedal pushes the oil liquid generated by the master cylinder control portion to directly enter the brake wheel cylinder after passing through the oil paths of the coupling valve assembly and the liquid path control module 4.
If the braking starts to carry out the boosting process under the condition of the electric control mode, when a driver steps on a brake pedal, a coupling valve of the coupling valve assembly is electrified, so that the coupling valve is closed and is not conducted, and an oil path between the main cylinder control part and the pressure execution part is separated. At this time, the simulator valve 9 is electrically conducted to connect the chamber of the brake master cylinder 5 and the pedal simulation chamber, oil in the chamber of the brake master cylinder 5 enters the pedal simulation chamber, the brake foot feeling is simulated by the feedback force of the spring in the pedal simulator 8, and the pressure signal representing the brake intention is collected by the simulator pressure sensor 7.
In the pressure executing section, the motor 11 pushes the pump group 12 to output the brake oil with pressure and returns the oil to adjust the final output pressure through the pressure adjusting valve 21.
In the final output pressure boosting process, the motor 11 drives the pump set 12 to output oil for pressurization, and the pressure signal acquired by the pressure sensor 22 forms closed-loop control to adjust the opening of the pressure regulating valve 21 to control the pressure of the oil output by the pump set 12, so that the braking force in the braking process is changed.
The working process and principle of the invention after the supercharging control module 2 is arranged are as follows:
under the condition of non-braking state, the motor 11 of the pressurizing module 1 does not operate, the pressure regulating valve 21 of the pressurizing control module 2 is not electrified and is not conducted, and oil stored in the liquid storage module 3 does not enter the liquid path control module 4 after passing through the pressurizing module 1 and the pressurizing control module 2.
When the pedal is depressed, the brake is started, and in the braking state, the pedal pushes the piston in the brake master cylinder 5 to move through the connecting rod, the oil pressure in the cavity of the brake master cylinder 5 is increased, and the oil flows into the pedal simulation cavity of the pedal simulator 8 after passing through the opened simulator valve 9.
The increase of the oil pressure in the cavity of the brake master cylinder 5 is monitored by the simulator pressure sensor 7 in real time, the simulator pressure sensor 7 feeds back the signal of the increase of the oil pressure to the motor 11 of the pressurizing module 1, the motor 11 drives the pump set 12 to work, as shown in fig. 3, the pump set 12 extracts oil from the liquid storage module 3 and outputs the oil to the pressurizing control module 2, and the oil directly enters the liquid path control module 4 through the oil connecting pipeline.
When the pressure of the oil output by the pump unit 12 is too high, the execution pressure of the oil output by the pump unit 12 of the pressurizing module 1 to the hydraulic control module 4 does not actually and accurately reach the target pressure corresponding to the oil pressure in the cavity of the brake master cylinder 5 monitored by the simulator pressure sensor 7 in real time, and the oil pressure is further input to the hydraulic control module 4 to damage the pipeline and pipeline elements and the brake wheel cylinders thereof in the hydraulic control module 4, so that the service life is reduced, burst is possibly generated seriously, and the brake is invalid.
Under such a condition, the pressure regulating valve 21 is opened through the intervention control of the pressurizing control module 2, as shown in fig. 3, so that the oil flowing out of the oil outlet of the pump set 12 returns to the liquid storage module 3 through the pressure regulating valve 21, and the oil pressure output by the oil outlet of the pump set 12 is prevented from being too high.
The pressure regulating valve 21 is regulated as follows:
firstly, converting the oil pressure in a cavity of a brake master cylinder 5 monitored in real time by a simulator pressure sensor 7 into the oil pressure corresponding to the oil outlet of a pump set 12 according to a preset relation of a brake system as a target pressure P1, as shown in (a) of FIG. 7;
next, the oil pressure monitored in real time by the pressure sensor 22 in the pressurization control module 2 of the pressure executing section is used as the execution oil pressure P2, as shown in (b) of fig. 7;
finally, the target pressure P1 and the execution pressure P2 are compared, and then fed back to the pressure regulating valve 21, and the opening degree of the pressure regulating valve 21 is adjusted, so that the oil pressure actually output by the oil outlet of the pump set 12 is not higher than a preset oil pressure threshold.
Specifically, the difference is obtained by comparing the target pressure P1 minus the execution pressure P2, and the following determination is made:
if the difference is positive or zero, the pressure regulating valve 21 is closed;
if the difference is a negative value, the opening degree of the pressure regulating valve 21 is adjusted according to the magnitude of the difference, and the larger the difference is, the larger the opening degree of the pressure regulating valve 21 is.
On the one hand, the invention avoids the problem of too high brake oil pressure by arranging the pressure regulating valve 21 between the oil outlets of the liquid storage module 3 and the pressurizing module 1, so that the pressure regulation of the brake oil pressure becomes possible.
On the other hand, the opening degree of the pressure regulating valve 21 is regulated by comparing the corresponding oil pressure output by the oil outlet of the pump set 12 in real time with the oil pressure monitored by the simulator pressure sensor 7 in real time, so that the accurate pressure regulation and output of the brake oil pressure are realized, the phenomenon of fluctuation of the brake oil pressure is reduced and avoided, and the condition of ABS locking is also reduced and avoided.
In the above process, the opening of the pressure regulating valve 21 can be regulated, and simultaneously, the rotation speed of the upper regulating motor 11 can be correspondingly replaced or increased, so that the oil pressure corresponding to the oil outlet of the pump set 12 can be influenced.
The process completes the generation and the transmission of the brake oil pressure so as to realize the braking. After the braking process is completed, the motor 11 is turned off, and the pressure regulating valve 21 is closed.
Claims (8)
1. A chassis integrated brake system, characterized by:
comprises a master cylinder control part for receiving a target pressure signal generated by the control action of external braking in real time and transmitting the target pressure signal to a pressure execution part;
the master cylinder control part comprises a liquid storage module (3) for storing oil; the brake master cylinder comprises a brake master cylinder (5), wherein a cavity communicated with a liquid storage module (3) is arranged in the brake master cylinder, and a piston in the cavity is synchronously connected with a pedal; the brake master cylinder comprises a simulator pressure sensor (7), a brake master cylinder (5) and a pressure executing part, wherein the simulator pressure sensor is connected to the chamber of the brake master cylinder and is used for monitoring the oil pressure in the chamber in real time and then sending feedback to the pressure executing part;
the hydraulic braking control system comprises a pressure executing part with pressure regulating control, a hydraulic braking control part and a hydraulic braking control part, wherein the pressure executing part is used for receiving a target pressure signal from a master cylinder control part in real time, simultaneously monitoring the pressure of an oil way in the hydraulic braking control part in real time to generate a monitoring pressure signal, and combining the target pressure signal and the monitoring pressure signal to perform pressure regulating control so as to execute braking;
the pressure executing section:
the hydraulic control system comprises a pressurizing module (1) and a liquid storage module (3) connected with a master cylinder control part, wherein the pressurizing module (2) is used for generating adjustable oil pressure by pumping oil from the master cylinder control part and outputting the oil to a liquid path control module (4);
the hydraulic control system comprises a pressurizing control module (2), wherein a liquid storage module (3) of a pressurizing module (1) and a master cylinder control part is respectively connected with a liquid path control module (4) and is used for adjusting and controlling the pressure of oil output from the pressurizing module (1) to the liquid path control module (4);
the connecting oil way pipeline between the pressurizing module (1) and the liquid storage module (3) of the master cylinder control part is different from the connecting oil way pipeline between the pressurizing control module (2) and the liquid storage module (3) of the master cylinder control part, and is a pipeline which is not communicated with each other and is independent;
the hydraulic control system comprises a hydraulic control module (4), a pressure increasing control module (2) and a brake wheel cylinder, wherein the hydraulic control module is connected between the pressure increasing control module (2) and the brake wheel cylinder and is used for conveying oil under the oil pressure regulated by the pressure increasing module (1) to serve as brake oil to the brake wheel cylinder needing braking;
the supercharging control module (2) specifically comprises:
the hydraulic oil return device comprises a pressure regulating valve (21), a hydraulic oil return valve and a hydraulic oil return valve, wherein the pressure regulating valve is connected between an oil inlet and an oil outlet of a pressurizing module (1), namely between a liquid storage module (3) connected with a master cylinder control part and the oil outlet of the pressurizing module (1) and is used for returning oil liquid output by the oil outlet of the pressurizing module (1) into the liquid storage module (3); the target oil pressure monitored in real time by the master cylinder control part is combined with the execution oil pressure monitored in real time by a pressure sensor (22) in a pressurizing control module (2) of the pressure execution part to be fed back to a pressure regulating valve (21), and the opening and closing of the pressure regulating valve (21) are regulated;
the regulation of the pressure regulating valve (21) is specifically to compare and feed back the execution oil pressure P2 monitored in real time by the pressure sensor (22) in the pressurizing control module (2) of the pressure execution part to the pressure regulating valve (21) according to the oil pressure conversion target pressure P1 in the cavity of the brake master cylinder (5) monitored in real time by the simulator pressure sensor (7) so as to regulate the opening of the pressure regulating valve (21), so that the oil pressure actually output by an oil outlet of the pressurizing module (1) is not higher than a preset oil pressure threshold value;
the hydraulic control system comprises an oil liquid connecting pipeline which is arranged between an oil outlet of a pressurizing module (1) and a liquid path control module (4) and is directly connected;
the hydraulic control system comprises a pressure sensor (22), and is arranged on an oil connecting pipeline connected between an oil outlet of a pressurizing module (1) and a liquid path control module (4) and used for monitoring the oil pressure on the oil connecting pipeline in real time and feeding back the oil pressure to a pressure regulating valve (21).
2. A chassis integrated brake system as claimed in claim 1, wherein:
the master cylinder control portion specifically also:
comprises a pedal displacement sensor (6) which is arranged at the pedal and used for monitoring the moving distance of the pedal in real time and used as a braking intention signal;
comprises a simulator assembly connected to a chamber of the brake master cylinder (5) for sensing the oil pressure in the chamber of the brake master cylinder (5) and generating an elastically feedback force, reacting on the piston and pedal.
3. A chassis integrated brake system as claimed in claim 2, wherein:
two chambers which are communicated with the liquid storage module (3) and are adjacently arranged in sequence are arranged in a cylinder body of the brake master cylinder (5), wherein one chamber is connected with the pedal through a piston and is used as a first chamber, and the other chamber is used as a second chamber;
the simulator pressure sensor (7) is connected to the first chamber or the second chamber of the brake master cylinder (5) and is used for monitoring the oil pressure in the first chamber in real time and then sending feedback to the pressure executing part;
the simulator assembly is connected to the first chamber or the second chamber of the brake master cylinder (5) for sensing the oil pressure in the first chamber of the brake master cylinder (5) and generating an elastically feedback force to apply a reaction force to the piston and pedal of the first chamber.
4. A chassis integrated brake system as claimed in claim 2, wherein:
the simulator component specifically comprises:
the pedal simulator comprises a pedal simulator (8), wherein a piston is arranged in the pedal simulator (8), the piston divides an inner cavity of the pedal simulator (8) into two cavities, one cavity is a pedal simulation cavity, a spring is arranged in the other cavity, and the piston is elastically connected with the inner side wall of the inner cavity of the pedal simulator (8);
the brake master cylinder comprises a simulator valve (9) which is connected between a chamber of the brake master cylinder (5) and a pedal simulation chamber and is used for communicating the chamber of the brake master cylinder (5) with the pedal simulation chamber;
comprises a one-way valve connected between the chamber of the brake master cylinder (5) and the pedal simulation chamber for allowing communication only from the pedal simulation chamber to the chamber of the brake master cylinder (5).
5. A chassis integrated brake system as claimed in claim 1, wherein:
the supercharging module (1) comprises a motor (11) and a pump set (12), wherein the output end of the motor (11) is connected with the control input end of the pump set (12), the motor (11) drives the pump set (12) to work, the oil inlet of the pump set (12) is communicated with the master cylinder control part, and the oil outlet of the pump set (12) is connected with the supercharging control module (2).
6. A chassis integrated brake system as claimed in claim 1, wherein:
the brake master cylinder further comprises a coupling valve assembly (10) which is connected between the oil paths of the master cylinder control part and the pressure execution part, and is used for isolating the oil paths of the master cylinder control part and the pressure execution part from oil entering the pressure execution part in the electric control mode so as not to allow oil in the brake master cylinder (5) control part to enter the pressure execution part; in the non-electric control mode, the oil paths of the master cylinder control part and the pressure execution part are communicated, so that the pressure oil generated by the master cylinder control part is transmitted to the pressure execution part, and the brake oil pressure control is directly performed.
7. The chassis integrated brake system of claim 6, wherein:
the coupling valve assembly (10), in particular;
the brake control device comprises a first coupling valve, a second coupling valve and a control valve, wherein the first coupling valve is connected between a first chamber of a brake master cylinder (5) and a pressure executing part and is used for opening and controlling the mechanical oil way communication between the master cylinder control part and the pressure executing part in a mechanical oil way control mode and closing and blocking the mechanical oil way communication between the master cylinder control part and the pressure executing part in an electric control mode;
the brake master cylinder comprises a second coupling valve which is connected between a second chamber of the brake master cylinder (5) and the pressure executing part and is used for opening and controlling the mechanical oil way communication between the master cylinder control part and the pressure executing part in a mechanical oil way control mode and closing and blocking the mechanical oil way communication between the master cylinder control part and the pressure executing part in an electric control mode.
8. A chassis integrated brake system as claimed in claim 1, wherein:
the brake master cylinder also comprises a pipeline arranged between the liquid storage module (3) and the brake master cylinder (5) so that the cavity of the brake master cylinder (5) is communicated with the liquid storage module (3) in a limited way.
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| CN202210503542.5A CN114604216B (en) | 2022-05-10 | 2022-05-10 | Chassis integrated braking system |
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| KR20220107435A (en) * | 2021-01-25 | 2022-08-02 | 현대모비스 주식회사 | Braking System of Vehicle Capable of Regenerative Braking and Hydraulic Braking and Controlling Method Thereof |
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| CN112406836A (en) * | 2020-12-10 | 2021-02-26 | 吉林大学 | Brake-by-wire system with backup function and control method thereof |
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| JP4403682B2 (en) * | 1999-10-27 | 2010-01-27 | 株式会社アドヴィックス | Vehicle braking system and vehicle braking device |
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| CN109455174B (en) * | 2018-12-22 | 2023-10-13 | 吉林大学 | Wire control hydraulic braking system adopting high-pressure accumulator and braking control method thereof |
| CN110682900A (en) * | 2019-10-17 | 2020-01-14 | 浙江亚太机电股份有限公司 | Integrated braking system with adjustable pedal feel and self-checking function |
| CN113335242A (en) * | 2021-06-23 | 2021-09-03 | 中国第一汽车股份有限公司 | Integrated braking energy recovery system and integrated braking energy recovery method |
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| JP2009107437A (en) * | 2007-10-29 | 2009-05-21 | Toyota Motor Corp | Brake control device and brake control method |
| CN105799679A (en) * | 2016-04-14 | 2016-07-27 | 芜湖伯特利汽车安全系统股份有限公司 | Oil pressure assistance braking system and control method thereof |
| CN112406836A (en) * | 2020-12-10 | 2021-02-26 | 吉林大学 | Brake-by-wire system with backup function and control method thereof |
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