CN115709705A - Brake boosting method and device and vehicle - Google Patents
Brake boosting method and device and vehicle Download PDFInfo
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- CN115709705A CN115709705A CN202211467004.1A CN202211467004A CN115709705A CN 115709705 A CN115709705 A CN 115709705A CN 202211467004 A CN202211467004 A CN 202211467004A CN 115709705 A CN115709705 A CN 115709705A
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Abstract
The embodiment of the invention discloses a brake boosting method, a brake boosting device and a vehicle, wherein the method comprises the steps that an integrated brake control system obtains brake data of the vehicle to be controlled; the brake boosting system determines a target braking demand of a driver based on the braking data; the integrated brake control system reads the current brake request of the vehicle to be controlled; the brake boosting system determines a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled; the brake boosting system determines the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request. According to the application, the integrated brake control system is used for collecting the brake data of the vehicle to be controlled, the brake boosting system judges the brake intention of the driver based on the brake data, and brake boosting pressure is generated according to the brake intention of the driver and the vehicle brake request, so that the technical effect of improving the brake boosting stability is achieved.
Description
Technical Field
The embodiment of the invention relates to the technical field of brake boosting, in particular to a brake boosting method, a brake boosting device and a vehicle.
Background
Passenger cars on the current market are all equipped with a brake booster device, and a driver can amplify and generate a large braking force through a booster through a small force to enable the vehicle to brake stably.
At present, a brake booster device of a fuel vehicle on the market detects the change of the brake fluid pressure of a main cylinder through a controller to complete auxiliary brake boosting work. This method of assisting assistance is only used when the brake fluid pressure changes rapidly or changes particularly significantly, i.e. when the high-speed brake is stopped. In daily conditions, this auxiliary assistance is very unstable, and the brake booster device of a fuel vehicle type cannot meet the demands of more users in the market. The brake booster device of the new energy automobile usually adopts the motor to reversely recover brake energy to complete auxiliary power assistance, and the stability of the brake booster device is also low, so that the auxiliary brake power assistance is influenced.
Disclosure of Invention
The embodiment of the invention provides a brake boosting method, a brake boosting device and a vehicle, and solves the technical problem of low brake boosting stability in the prior art that auxiliary braking is carried out by detecting the change of brake fluid pressure of a master cylinder or by adopting a method of recovering braking energy by motor reversal.
The embodiment of the invention provides a brake boosting method, which comprises the following steps that when a driver of a vehicle to be controlled presses a brake pedal:
the integrated brake control system acquires brake data of a vehicle to be controlled, wherein the brake data comprises push rod displacement, master cylinder pressure and brake pedal signals;
a brake boosting system determines a target braking demand of the driver based on the braking data;
the integrated brake control system reads a current brake request of the vehicle to be controlled, wherein the current brake request at least comprises one of the following components: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request;
the brake power assisting system determines a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled;
the brake boosting system determines a brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.
Further, before the brake boosting system determines the brake boosting pressure of the vehicle to be controlled, the brake boosting method further comprises the following steps:
the brake boosting system acquires the current working state of the integrated brake control system;
the brake boosting system judges the fault level of the integrated brake control system based on the current working state of the integrated brake control system;
the brake boost system determines a corresponding brake boost pressure generation mode based on a fault level of the integrated brake control system.
Further, the step of the brake boosting system judging the fault level of the integrated brake control system based on the current working state of the integrated brake control system comprises:
if the integrated brake control system has no fault, the fault grade of the integrated brake control system is one grade;
if the pedal travel sensor of the integrated brake control system fails, the failure grade of the integrated brake control system is two grades;
if a master cylinder pressure sensor of the integrated brake control system fails or an oil can liquid level sensor of the integrated brake control system fails, the failure level of the integrated brake control system is three levels;
and if all the faults of the integrated brake control system fail, the fault grade of the integrated brake control system is four.
Further, the brake boost pressure generation modes include a full function mode, a pedal feel degraded mode, an alternate pressure build mode, a single line pressure build mode, and a mechanical backup mode, and the determining, by the brake boost system, a corresponding brake boost pressure generation mode based on the fault level of the integrated brake control system includes:
when the fault grade of the integrated brake control system is one grade, the brake boosting pressure generation mode of the brake boosting system adopts a full-function mode;
when the fault grade of the integrated brake control system is two-grade, a brake boosting pressure generation mode of the brake boosting system adopts a pedal feel degradation mode;
when the fault grade of the integrated brake control system is three-grade, the brake boosting pressure generation mode of the brake boosting system adopts an alternate voltage build-up mode or a single pipeline voltage build-up mode;
when the fault grade of the integrated brake control system is four, the brake boosting pressure generation mode of the brake boosting system adopts a mechanical backup mode.
Further, the brake boosting system determining the target driver braking demand based on the braking data comprises:
the brake boosting system utilizes the brake pedal signal to simulate to obtain a pedal feeling signal;
and the brake boosting system determines to obtain the target brake demand of the driver through analog simulation by using the pedal feeling signal, the push rod displacement and the master cylinder pressure.
Further, before determining the vehicle braking request of the vehicle to be controlled, the braking boosting method further comprises the following steps:
and performing priority sequencing on the read current braking request by using a preset priority sequence, wherein the preset priority sequence comprises the following steps: the pedal braking request is of a first priority, the active emergency braking system request, the anti-lock braking system request and the vehicle dynamic braking request are of a second priority, the external braking request is of a third priority, and the electronic parking system request is of a fourth priority.
Further, the brake boosting system determining the vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled comprises:
and the brake power assisting system determines the vehicle brake request of the vehicle to be controlled based on the priority ranking of the current brake request and the current actual working condition of the vehicle to be controlled.
Further, after determining that the brake boosting pressure of the vehicle to be controlled is obtained, the brake boosting method further comprises the following steps:
the brake boosting system adjusts the brake fluid input and output quantity of the integrated brake control system based on the brake boosting pressure;
and the integrated brake control system controls the vehicle to be controlled to brake by using the regulated brake fluid inlet and outlet quantity.
The embodiment of the invention also provides a brake boosting device, which comprises:
the integrated brake control system is used for acquiring brake data of a vehicle to be controlled when a driver of the vehicle to be controlled steps on a brake pedal, wherein the brake data comprises push rod displacement, master cylinder pressure and a brake pedal signal;
a brake boosting system for determining a target braking demand of the driver based on the braking data;
the integrated brake control system is further used for reading a current braking request of the vehicle to be controlled, wherein the current braking request at least comprises one of the following: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request;
the brake boosting system is further used for determining a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled;
the brake boosting system is further used for determining the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.
The embodiment of the invention further provides a vehicle, and the vehicle comprises the brake boosting device in any embodiment.
The embodiment of the invention discloses a brake boosting method, a brake boosting device and a vehicle, wherein the method comprises the steps that an integrated brake control system acquires brake data of the vehicle to be controlled; the brake boosting system determines a target braking demand of a driver based on the braking data; the integrated brake control system reads the current brake request of the vehicle to be controlled; the brake boosting system determines a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled; the brake boosting system determines the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request. According to the method and the device, the brake data of the vehicle to be controlled are collected through the integrated brake control system, the brake boosting system judges the brake intention of the driver based on the brake data and generates brake boosting pressure according to the brake intention of the driver and the vehicle brake request, the technical problem that the brake boosting stability is low when auxiliary braking is carried out through a method of detecting the brake pressure of a main cylinder or recovering the brake ability by adopting motor reversal in the prior art is solved, and the technical effect of improving the brake boosting stability is achieved.
Drawings
FIG. 1 is a flow chart of a method of brake boosting provided by an embodiment of the present invention;
FIG. 2 is a block diagram of an integrated brake control system and brake boosting system according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method of brake boosting provided by an embodiment of the present invention;
FIG. 4 is a hydraulic schematic of a full function mode provided by an embodiment of the present invention;
fig. 5 is a structural view of a brake assist apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or may be implemented in combination with each other, and the embodiments of the present invention are not limited in this respect.
Fig. 1 is a flowchart of a brake boosting method according to an embodiment of the present invention.
As shown in fig. 1, when a driver of a vehicle to be controlled depresses a brake pedal, the brake boosting method specifically includes the following steps:
s101, the integrated brake control system obtains brake data of a vehicle to be controlled, wherein the brake data comprise push rod displacement, master cylinder pressure and brake pedal signals.
Specifically, when a driver steps on a brake pedal, the system automatically closes two pressure build-up Simulation valves PSV1 and PSV2 (pressure build-up Simulation valves), and simultaneously isolates a main cylinder from a wheel cylinder hydraulic oil circuit, the integrated brake control system measures the displacement of a push rod of the main cylinder through a displacement sensor, measures the pressure of the main cylinder through a main cylinder pressure sensor, and acquires a brake pedal signal through a pedal stroke sensor.
Fig. 2 is a structural diagram of an Integrated brake control system and a brake boosting system according to an embodiment of the present invention, referring to fig. 2, a vehicle to be controlled is provided with a plurality of sensors, including a wheel speed Sensor, a displacement Sensor, a master cylinder/electric cylinder pressure Sensor, a PTS (Pedal Travel Sensor) Sensor, an oil can liquid level Sensor, and a motor position Sensor, wherein in the sensors, except for the wheel speed Sensor connected to a knuckle of the vehicle to be controlled, other sensors are mechanically connected to an interior of the Integrated brake control system (IBC), and meanwhile, the Integrated brake control system is electrically connected to the brake boosting system. The controller in the integrated brake control system transmits the brake data to the brake booster system after acquiring the corresponding brake data through each sensor.
Referring to fig. 2, the vehicle to be controlled provides power to the integrated brake control system, and sends a braking demand signal to the integrated brake control system when the vehicle to be controlled needs braking.
S102, the brake boosting system determines a target braking demand of a driver based on the braking data.
Optionally, S102 specifically includes: the brake boosting system utilizes the brake pedal signal to simulate to obtain a pedal feeling signal; the brake boosting system utilizes the pedal feeling signal, the push rod displacement and the master cylinder pressure to determine and obtain the target brake demand of the driver through simulation.
Specifically, the Brake boosting system has a Brake Boosting Function (BBF), and as shown in fig. 2, the Brake boosting system is disposed in an ECU (Electronic Control Unit) of a vehicle to be controlled and connected to a combination instrument through a gateway, wherein the Brake boosting system is connected to the gateway, the gateway and the combination instrument are all in communication connection through a CAN line, the combination instrument refers to an instrument panel disposed in a cab of the vehicle to be controlled, and various data information of the Brake boosting system CAN be displayed to a driver through the combination instrument.
After the brake assisting system receives brake data, a Pedal Feel Simulator (PFS) arranged in the brake assisting system can simulate by using a brake pedal signal to obtain a pedal feel signal so as to realize simulation of brake pedal feel of a driver in a braking process, and then the target braking requirement of the driver is obtained by simulating and simulating through a preset brake pressure simulation model by using the pedal feel signal, push rod displacement and master cylinder pressure, so that the braking intention of the driver is obtained. The preset brake pressure simulation model is built in advance through a simulink module in Matlab software.
S103, reading a current braking request of the vehicle to be controlled by the integrated braking control system, wherein the current braking request at least comprises one of the following steps: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request.
Specifically, in order to make the determined brake boosting pressure more accurate, a current brake request of the vehicle to be controlled needs to be acquired, specifically, the pedal brake request refers to a pedal brake signal sent by a driver when the driver steps on a brake pedal; the active Emergency Braking system request refers to a Braking signal which is sent out when an active Emergency Braking system (AEB) vehicle normally runs under the condition of non-adaptive cruising and actively brakes if the vehicle meets an Emergency dangerous condition or the distance between the vehicle and a front vehicle and a pedestrian is less than a safe distance; the anti-lock Brake System request refers to a Brake signal sent by an anti-lock Brake System (ABS); the Vehicle dynamic braking request refers to a braking signal sent by a Vehicle Dynamic Control (VDC), and comprises a Vehicle roll preventing signal; the external braking request refers to a braking signal sent to the integrated braking Control system by a constant-speed cruise system or a parking Auxiliary system, wherein the constant-speed cruise system comprises Driver assisted Deceleration Control-Stop Control (CDD-S); the electronic parking system request refers to a Brake signal emitted by an Electronic Parking Brake (EPB).
And S104, the brake boosting system determines the vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled.
Specifically, after obtaining the current braking request of the vehicle to be controlled, the brake boosting system may further obtain a current actual operating condition of the vehicle to be controlled, specifically, the current actual operating condition at least includes a current running speed of the vehicle to be controlled, a running road condition of the vehicle to be controlled, and a current running environment of the vehicle to be controlled, where the current running environment may be a current temperature state, a current humidity state, a current weather state, and the like. And after the current actual working condition is obtained, determining a vehicle braking request of the vehicle to be controlled by combining the current braking request and the current actual working condition.
It should be noted that, if the current braking request includes more than one type, the brake boosting system may rank the current braking requests according to a preset priority order, and then arbitrate the braking request sent by the vehicle by combining the current braking request with the highest priority with the current actual working condition, so as to finally determine the vehicle braking request of the vehicle to be controlled.
S105, the brake boosting system determines the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.
Specifically, after a vehicle braking request of a vehicle to be controlled is determined, the brake boosting system determines a brake boosting pressure of the vehicle to be controlled based on the target braking request and the vehicle braking request, and then the brake boosting system controls the motor and the electromagnetic valve actuator to act through a pressure building cylinder pressure control system of the vehicle to be controlled, so that the required target pressure (namely, the brake boosting pressure) is generated in the wheel cylinder.
Specifically, the brake boosting system pressurizes the four-wheel calipers according to target pressure maximum values marked by two curves of deceleration-pedal displacement and deceleration-pedal force according to target brake requirements and vehicle brake requests to generate brake force, so that the whole vehicle achieves the purpose of brake deceleration, the stability of auxiliary boosting is ensured, and the safety of a driver and passengers is protected when the brake boosting fails at high speed. The pedal displacement is the push rod displacement in the brake data, and the pedal force is the master cylinder pressure in the brake data.
It should be noted that the brake boosting system needs to work normally under the condition that the performance design standard can be achieved within the following boundary range, and the performance of the brake boosting system beyond the boundary range cannot be guaranteed. The specific boundary conditions are as follows: (1) the brake boosting system is available within the full vehicle speed range; (2) The installation of the integrated brake control system on the firewall of the whole vehicle meets the installation requirements of an X axis, a Y axis, push rod swing and an installation bolt; (3) The working durability of the brake power-assisted system is within the specified design life, or Ignition On 8000 hours, or 300000 kilometers, or 2200000 braking times (On first arrival basis); (4) The range of the power supply voltage (connector end) of the integrated brake control system required by the normal work of the brake boosting system is 10V-16V; (5) When the brake boosting system works, hydraulic pipelines and brakes related to the integrated brake control system have no leakage, aging and installation related problems.
According to the method and the system, the brake data of the vehicle to be controlled are collected through the integrated brake control system, the brake boosting system judges the brake intention of the driver based on the brake data, and brake boosting pressure is generated according to the brake intention of the driver and the vehicle brake request, so that the technical problem that the brake boosting stability is low when auxiliary braking is carried out through detecting the change of the brake pressure of a main cylinder or adopting a method of recovering the brake capacity through motor reversal in the prior art is solved, and the technical effect of improving the brake boosting stability is realized.
On the basis of the above technical solutions, fig. 3 is a flowchart of another brake boosting method provided in an embodiment of the present invention, and as shown in fig. 3, before the brake boosting system determines the brake boosting pressure of the vehicle to be controlled in S105, the brake boosting method further includes:
s301, the brake power assisting system obtains the current working state of the integrated brake control system.
Specifically, since the integrated brake control system is a highly integrated wire-controlled decoupling system, in order to better perform braking at a safe distance by compensating for braking assistance, so as to ensure the safety of a driver and passengers, brake assistance pressure is generated in the brake assistance system, and whether the integrated brake control system fails or not, that is, whether a failure working condition exists or not, is also required to be determined so as to determine whether the required brake assistance can be generated subsequently or not, and therefore, the current working state of the integrated brake control system is also required to be acquired.
And S302, the brake boosting system judges the fault level of the integrated brake control system based on the current working state of the integrated brake control system.
And S303, the brake boosting system determines a corresponding brake boosting pressure generation mode based on the fault level of the integrated brake control system.
Specifically, because there are many sensors or other parts involved in the integrated brake control system, the failure conditions are different, and in some cases, some sensors or parts fail, and the remaining parts can still complete the brake boosting, so that the current working state of the integrated brake control system is divided into different failure levels according to different failure degrees, so that the brake boosting system provides a corresponding brake boosting mode (i.e., the above-mentioned brake boosting pressure generation mode) and an alarm strategy according to the failure levels of the integrated brake control system.
On the basis of the above technical solutions, S302 specifically includes: if the integrated brake control system has no fault, the fault grade of the integrated brake control system is one grade; if the pedal stroke sensor of the integrated brake control system fails, the failure grade of the integrated brake control system is two grades; if a master cylinder pressure sensor of the integrated brake control system fails or an oil can liquid level sensor of the integrated brake control system fails, the failure level of the integrated brake control system is three levels; and if all faults of the integrated brake control system fail, the fault grade of the integrated brake control system is four.
On the basis of the above technical solutions, the brake boost pressure generation mode includes a full function mode, a pedal feel degradation mode, an alternate pressure buildup mode, a single-pipe pressure buildup mode, and a mechanical backup mode, and S303 specifically includes: when the fault grade of the integrated brake control system is first grade, the brake boosting pressure generation mode of the brake boosting system adopts a full-function mode; when the fault grade of the integrated brake control system is two-grade, a brake boosting pressure generation mode of the brake boosting system adopts a pedal feel degradation mode; when the fault grade of the integrated brake control system is three-grade, the brake boosting pressure generation mode of the brake boosting system adopts an alternate voltage build-up mode or a single pipeline voltage build-up mode; when the fault level of the integrated brake control system is four levels, the brake boosting pressure generation mode of the brake boosting system adopts a mechanical backup mode.
Specifically, a full function mode (FullSys), namely, a braking request of a braking assistance system, is derived from the action of a driver stepping on a brake pedal, when the driver steps on the brake pedal, the braking assistance system calculates braking pressure, and provides braking assistance according to the braking requirement of the driver; the Pedal Feel degradation mode (Degraded Pedal Feel) is a mode adopted when a Pedal stroke sensor of the integrated brake control system fails, and at the moment, the brake boosting system can give an alarm prompt to a driver; in short, the alternating voltage-building mode and the single-pipeline voltage-building mode are based on the idea of isolating loops, the failed loops are disconnected, and the loops capable of working normally are used for subsequent control; the mechanical backup mode (HydBack) is a mode adopted by the brake boosting system when all the integrated brake control systems fail, in which the brake boosting system does not generate boosting, that is, the mode is a no-boosting mode.
Fig. 4 is a hydraulic schematic diagram of a full function mode provided by an embodiment of the present invention.
For example, as shown in fig. 4, in the full function mode, when the brake pedal is stepped on, the master Cylinder Simulation valves CSV1 (Cylinder Simulation Valve), CSV2 are closed for isolating the master Cylinder connected to the oil can in the vehicle to be controlled and the pressure buildup Cylinder; the sensory Simulation Valve SSV (Sense Simulation Valve) is opened; the pressure build-up simulation valves PSV1 and PSV2 are opened, and 4 IV valves (Isolation valves) are opened (i.e. four valves IVLF, IVRR, IVLR, IVRF shown in fig. 4, where LF represents front left, RR represents rear right, LR represents rear left, and RF represents front right) to open the active pressure build-up circuit; a cavity of a main cylinder is pressurized, and a main cylinder pressure sensor and a pedal stroke sensor detect signal values; the pedal Feeling Simulator PFS (Padel springing Simulator) generates a pedal Feeling signal, the motor works, the pressure building cylinder builds pressure, and pressure building of 4 wheel cylinders is achieved.
It should be noted that, in fig. 4, four circles marked with LF, RR, LR, and RF respectively represent a left front wheel, a right rear wheel, a left rear wheel, and a right front wheel of the vehicle to be controlled; P/U represents a pressure sensor, T/U represents a temperature sensor, and phi/U represents an angle sensor.
On the basis of the above technical solutions, in S105, before the brake boosting system determines the brake boosting pressure of the vehicle to be controlled, the brake boosting method further includes:
and carrying out priority sequencing on the read current braking request by utilizing a preset priority sequence, wherein the preset priority sequence comprises the following steps: the pedal braking request is of a first priority, the active emergency braking system request, the anti-lock braking system request and the vehicle dynamic braking request are of a second priority, the external braking request is of a third priority, and the electronic parking system request is of a fourth priority.
Specifically, since the pedal braking request is a braking request that is sent by stepping on the brake pedal at the first time by the driver, the pedal braking request is a braking request with the highest priority among all current braking requests, and then, according to the degree of urgency of the braking request, the active emergency braking system request, the anti-lock braking system request, and the vehicle dynamic braking request are sequentially set to a second priority, the external braking request is set to a third priority, and the electronic parking system request is set to a fourth priority.
On the basis of the above technical solutions, S104 specifically includes: the brake assisting system determines the vehicle brake request of the vehicle to be controlled based on the priority ranking of the current brake request and the current actual working condition of the vehicle to be controlled.
Specifically, after the priority ranking of the current braking request is obtained, the braking assistance system determines the vehicle braking request of the vehicle to be controlled according to the priority ranking of the current braking request and the current actual working condition of the vehicle to be controlled.
On the basis of the above technical solutions, after determining and obtaining the brake boosting pressure of the vehicle to be controlled in S105, the brake boosting method further includes: the brake boosting system adjusts the brake fluid input and output quantity of the integrated brake control system based on the brake boosting pressure; the integrated brake control system controls the vehicle to be controlled to brake by using the regulated brake fluid inlet and outlet amount.
Specifically, referring to fig. 2, after the brake boosting pressure of the vehicle to be controlled is obtained, the brake boosting system adjusts the brake fluid inflow amount of the integrated brake control system based on the brake boosting pressure, so that the integrated brake control system can perform brake boosting control on the vehicle to be controlled.
In the embodiment of the invention, by using the brake boosting method provided by the application, the following advantages are achieved: (1) The integrated brake control system and the brake boosting system judge the brake intention of a driver by monitoring the push rod displacement and the master cylinder pressure input by the driver and provide stable brake boosting for a vehicle by combining a vehicle brake request; (2) According to different failure conditions of the integrated brake control system, the brake power-assisted system can provide corresponding power-assisted modes and alarm strategies, and brake stopping at a safe distance is completed through compensated brake power assistance, so that the safety of a driver and passengers is ensured. (3) The brake booster is stable and comfortable in the braking process, and has no obvious vehicle pitching especially in the low-speed parking process, so that the problem that the brake booster in the prior art is only suitable for a high-speed braking state is solved. (4) Under different driving modes (sports, comfort, snowfield and the like), the self-adaptive adjustment function of the brake pedal feeling smaller than 0.4g (calibration value) is realized, namely, the self-adaptive adjustment function is realized by identifying and calibrating different parameters according to the braking intention of a driver. (5) When the vehicle speed exceeds 100km/h, the deceleration is below 0.3g and the time exceeds 2s, the integrated brake control system can perform brake hydraulic compensation to ensure that the deceleration is constant and enter and exit with a certain slope (the entering and exiting slopes are to be calibrated)
Fig. 5 is a structural view of a brake servo unit according to an embodiment of the present invention, and as shown in fig. 5, the brake servo unit includes:
the integrated brake control system 51 is used for acquiring brake data of the vehicle to be controlled when a driver of the vehicle to be controlled steps on a brake pedal, wherein the brake data comprises push rod displacement, master cylinder pressure and a brake pedal signal;
a brake boosting system 52 for determining a target driver braking demand based on the braking data;
the integrated brake control system 51 is further configured to read a current braking request of the vehicle to be controlled, wherein the current braking request includes at least one of: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request;
the brake boosting system 52 is further configured to determine a vehicle braking request of the vehicle to be controlled based on the current braking request and the current actual operating condition of the vehicle to be controlled;
the brake boosting system 52 is also used to determine a brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.
Optionally, before the brake boosting system 52 determines the brake boosting pressure of the vehicle to be controlled, the brake boosting system 52 is further configured to obtain the current working state of the integrated brake control system; judging the fault level of the integrated brake control system based on the current working state of the integrated brake control system; a corresponding brake boost pressure generation mode is determined based on a fault level of the integrated brake control system.
Optionally, the brake boosting system 52 is specifically configured to:
if the integrated brake control system 51 has no fault, judging that the fault level of the integrated brake control system 51 is a first level;
if the pedal stroke sensor of the integrated brake control system 51 fails, the failure level of the integrated brake control system 51 is judged to be two levels;
if the master cylinder pressure sensor of the integrated brake control system 51 fails or the oilcan liquid level sensor fails, the failure level of the integrated brake control system 51 is judged to be three levels;
if all the faults of the integrated brake control system 51 fail, it is determined that the fault level of the integrated brake control system 51 is four levels.
Optionally, the brake boosting pressure generating mode includes a full function mode, a pedal feel degradation mode, an alternate pressure buildup mode, a single line pressure buildup mode, and a mechanical backup mode, and the brake boosting system 52 is specifically configured to:
when the fault level of the integrated brake control system 51 is first level, the brake boosting pressure generation mode of the brake boosting system 52 adopts a full-function mode;
when the fault level of the integrated brake control system 51 is two-level, the brake boosting pressure generation mode of the brake boosting system 52 adopts a pedal feel degradation mode;
when the fault level of the integrated brake control system 51 is three, the brake boosting pressure generation mode of the brake boosting system 52 adopts an alternate voltage build-up mode or a single pipeline voltage build-up mode;
when the failure level of the integrated brake control system 51 is four levels, the brake boost pressure generation mode of the brake boost system 52 adopts the mechanical backup mode.
Optionally, the brake boosting system 52 is further configured to: simulating by using a brake pedal signal to obtain a pedal feeling signal; and determining to obtain the target braking demand of the driver through analog simulation by using the pedal feeling signal, the push rod displacement and the master cylinder pressure.
Optionally, before the brake boosting system 52 determines a vehicle braking request of the vehicle to be controlled, the brake boosting system 52 is further configured to:
and carrying out priority sequencing on the read current braking request by utilizing a preset priority sequence, wherein the preset priority sequence comprises the following steps: the pedal braking request is of a first priority, the active emergency braking system request, the anti-lock braking system request and the vehicle dynamic braking request are of a second priority, the external braking request is of a third priority, and the electronic parking system request is of a fourth priority.
Optionally, the brake boosting system 52 is further configured to: and determining the vehicle braking request of the vehicle to be controlled based on the priority ranking of the current braking requests and the current actual working condition of the vehicle to be controlled.
Optionally, after the brake boosting system 52 determines that the brake boosting pressure of the vehicle to be controlled is obtained, the brake boosting system 52 is further configured to adjust the brake fluid input amount of the integrated brake control system 51 based on the brake boosting pressure; the integrated brake control system 51 is further configured to control the vehicle to be controlled to brake by using the regulated brake fluid inlet and outlet amount.
The device provided by the embodiment of the present invention has the same implementation principle and the same technical effects as those of the foregoing method embodiments, and for the sake of brief description, reference may be made to corresponding contents in the foregoing method embodiments for the parts of the device embodiments that are not mentioned.
The brake boosting device provided by the embodiment of the invention has the same technical characteristics as the brake boosting method provided by the embodiment, so that the same technical problems can be solved, and the same technical effects are achieved.
The embodiment of the invention also provides a vehicle which comprises the brake boosting device in any embodiment.
The vehicle provided by the embodiment of the invention comprises the brake power assisting device in the embodiment, so that the vehicle provided by the embodiment of the invention also has the beneficial effects described in the implementation, and the details are not repeated herein.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A brake assist method characterized by, when a driver of a vehicle to be controlled depresses a brake pedal, comprising:
the integrated brake control system acquires brake data of a vehicle to be controlled, wherein the brake data comprises push rod displacement, master cylinder pressure and brake pedal signals;
a brake boosting system determines a target braking demand of the driver based on the braking data;
the integrated brake control system reads a current brake request of the vehicle to be controlled, wherein the current brake request at least comprises one of the following: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request;
the brake boosting system determines a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled;
the brake boosting system determines a brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.
2. The brake boosting method of claim 1, wherein prior to the brake boosting system determining the brake boosting pressure of the vehicle to be controlled, the brake boosting method further comprises:
the brake power assisting system acquires the current working state of the integrated brake control system;
the brake boosting system judges the fault level of the integrated brake control system based on the current working state of the integrated brake control system;
the brake boost system determines a corresponding brake boost pressure generation mode based on a fault level of the integrated brake control system.
3. The brake boosting method of claim 2, wherein the brake boosting system determining the fault level of the integrated brake control system based on the current operating state of the integrated brake control system comprises:
if the integrated brake control system has no fault, the fault grade of the integrated brake control system is one grade;
if the pedal travel sensor of the integrated brake control system fails, the failure grade of the integrated brake control system is two grades;
if a master cylinder pressure sensor of the integrated brake control system fails or an oil can liquid level sensor of the integrated brake control system fails, the failure level of the integrated brake control system is three levels;
and if all the faults of the integrated brake control system fail, the fault grade of the integrated brake control system is four.
4. A brake boosting method according to claim 3, wherein the brake boosting pressure generation modes include a full function mode, a pedal feel degraded mode, an alternate build-up mode, a single line build-up mode, and a mechanical backup mode, and the brake boosting system determining the respective brake boosting pressure generation mode based on the fault level of the integrated brake control system comprises:
when the fault grade of the integrated brake control system is one grade, the brake boosting pressure generation mode of the brake boosting system adopts a full-function mode;
when the fault grade of the integrated brake control system is two-grade, a brake boosting pressure generation mode of the brake boosting system adopts a pedal feel degradation mode;
when the fault grade of the integrated brake control system is three-grade, the brake boosting pressure generation mode of the brake boosting system adopts an alternate voltage build-up mode or a single pipeline voltage build-up mode;
when the fault grade of the integrated brake control system is four, the brake boosting pressure generation mode of the brake boosting system adopts a mechanical backup mode.
5. The brake boosting method of claim 1, wherein the brake boosting system determining the driver's target braking demand based on the braking data comprises:
the brake boosting system utilizes the brake pedal signal to simulate to obtain a pedal feeling signal;
and the brake boosting system determines to obtain the target brake demand of the driver through simulation by utilizing the pedal feeling signal, the push rod displacement and the master cylinder pressure.
6. A brake boosting method according to claim 1, wherein prior to determining a vehicle braking request of the vehicle to be controlled, the brake boosting method further comprises:
and performing priority sequencing on the read current braking request by using a preset priority sequence, wherein the preset priority sequence comprises the following steps: the pedal braking request is of a first priority, the active emergency braking system request, the anti-lock braking system request and the vehicle dynamic braking request are of a second priority, the external braking request is of a third priority, and the electronic parking system request is of a fourth priority.
7. The brake boosting method of claim 6, wherein the brake boosting system determining the vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual operating condition of the vehicle to be controlled comprises:
and the brake boosting system determines the vehicle brake request of the vehicle to be controlled based on the priority ranking of the current brake request and the current actual working condition of the vehicle to be controlled.
8. The brake boosting method according to claim 1, wherein after determining that the brake boosting pressure of the vehicle to be controlled is obtained, the brake boosting method further comprises:
the brake boosting system adjusts the brake fluid input and output quantity of the integrated brake control system based on the brake boosting pressure;
and the integrated brake control system controls the vehicle to be controlled to brake by using the regulated brake fluid inlet and outlet quantity.
9. A brake boosting device characterized by comprising:
the integrated brake control system is used for acquiring brake data of a vehicle to be controlled when a driver of the vehicle to be controlled steps on a brake pedal, wherein the brake data comprises push rod displacement, master cylinder pressure and a brake pedal signal;
a brake boosting system for determining a target braking demand of the driver based on the braking data;
the integrated brake control system is further used for reading a current braking request of the vehicle to be controlled, wherein the current braking request at least comprises one of the following: a pedal braking request, an active emergency braking system request, an anti-lock braking system request, a vehicle dynamic braking request, an external braking request, and an electronic parking system request;
the brake boosting system is further used for determining a vehicle brake request of the vehicle to be controlled based on the current brake request and the current actual working condition of the vehicle to be controlled;
the brake boosting system is further used for determining the brake boosting pressure of the vehicle to be controlled based on the target braking demand and the vehicle braking request.
10. A vehicle, characterized in that it comprises a brake boosting device according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211467004.1A CN115709705A (en) | 2022-11-22 | 2022-11-22 | Brake boosting method and device and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211467004.1A CN115709705A (en) | 2022-11-22 | 2022-11-22 | Brake boosting method and device and vehicle |
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| CN115709705A true CN115709705A (en) | 2023-02-24 |
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| CN202211467004.1A Pending CN115709705A (en) | 2022-11-22 | 2022-11-22 | Brake boosting method and device and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116691639A (en) * | 2023-05-12 | 2023-09-05 | 上海拿森汽车电子有限公司 | Vehicle braking control method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116691639A (en) * | 2023-05-12 | 2023-09-05 | 上海拿森汽车电子有限公司 | Vehicle braking control method and system |
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