CN111252057A - Braking system and control strategy for new energy vehicle - Google Patents
Braking system and control strategy for new energy vehicle Download PDFInfo
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- CN111252057A CN111252057A CN201911359699.XA CN201911359699A CN111252057A CN 111252057 A CN111252057 A CN 111252057A CN 201911359699 A CN201911359699 A CN 201911359699A CN 111252057 A CN111252057 A CN 111252057A
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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
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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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
- B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
Abstract
The invention discloses a braking system for a new energy vehicle, which comprises a braking device with a brake and an automobile electronic stability control system connected with a vehicle control unit, wherein the braking device comprises a pedal body and a pressure sensing module assembly, the pressure sensing module assembly is respectively connected with the pedal body and a driving place floor, the pressure sensing module assembly is electrically connected with the vehicle control unit, and the vehicle control unit is connected with the brake. The pressure sensing module arranged at the driving position feeds back the operation information of the driver to the vehicle control unit, and the vehicle control unit judges the braking intention of the driver by analyzing the pressure signals of the sensors and through a control strategy and feeds back the braking intention to the vehicle electronic stability control system so as to control the brake electrically and finally realize the braking of the vehicle.
Description
Technical Field
The invention relates to the technical field of new energy vehicles, in particular to a brake system for a new energy vehicle and a control strategy of the brake system.
Background
The traditional automobile brake system mostly adopts a vacuum boosting mode, a brake pedal also adopts a mechanical connection mode, a driver transmits braking force to a hydraulic oil cylinder through the mechanical connection mode through the brake pedal, and finally oil pressure led to a brake caliper is changed for braking by changing hydraulic oil flow in the hydraulic oil cylinder; during which time the vacuum assist system is required to provide intake manifold vacuum to assist in this braking action, otherwise the brakes are too hard to brake. However, if the vacuum degree is insufficient, the brake is hard, and even the brake fails. However, since the new energy automobile has no engine, intake manifold, etc. and cannot obtain the vacuum degree from these structures, the vacuum degree is generally obtained by means of a vacuum pump, for example, "a new energy automobile vacuum auxiliary system" disclosed in chinese patent document, whose publication number "CN 206704175U" includes a vacuum booster, a venturi tube, a vacuum tank, an electronic vacuum pump, a control unit, a switching solenoid valve and a check valve, the electronic vacuum pump is connected with the vacuum tank, the vacuum tank is connected with the switching solenoid valve, the switching solenoid valve is connected with one end of the venturi tube, the other end of the venturi tube is connected with air, the venturi tube is connected with the check valve, the check valve is connected with the vacuum booster, when the driver brakes, the control unit controls the switching solenoid valve to open, the vacuum booster and the venturi tube are connected with the vacuum tank, the electronic vacuum pump starts to vacuumize the vacuum booster, when the driver releases the brake pedal, the control unit controls the switch electromagnetic valve to be closed, and the electronic vacuum pump stops vacuumizing the vacuum booster. However, when the vacuum pump fails, the vacuum pump cannot provide a vacuum in time to brake, which may cause a safety problem. Therefore, how to utilize the electronic advantages of the new energy automobile and provide a feasible scheme for the brake system of the new energy automobile through a complete Vehicle controller (VCU-Vehicle Control Unit) of the new energy automobile is one of the popular research directions in the automobile field in the future.
Disclosure of Invention
Aiming at the problem that a brake fault is caused by the fact that a vacuum pump fault is easy to occur in the process that a new energy automobile obtains brake boosting by only relying on the vacuum pump in the prior art, the invention designs a brake system and a control strategy for the new energy automobile.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an automobile-used braking system of new forms of energy, is including the arresting gear of stopper and connect in the automotive electronics stable control system of vehicle control unit, arresting gear includes footboard body and pressure sensing module subassembly, pressure sensing module subassembly is connected with footboard body and driver's seat floor respectively, pressure sensing module subassembly is connected with vehicle control unit electricity, vehicle control unit is connected with the stopper. The ESC system is used for controlling the driving force and the braking force of front, back, left and right wheels, ensuring the lateral stability of the vehicle running, adjusting the pressure of a wheel cylinder through the feedback information of a pressure control module component, so that the brake effectively brakes the wheel hub, and a pressure sensing module of the driving place floor is mainly used for receiving the action condition of a driver, namely the tread condition of heels and soles on the driving place floor, and sequentially judging the braking intention of the driver.
Preferably, the pressure sensing module assembly includes a brake pedal sensor disposed on a surface of the brake pedal. The brake pedal sensor is used for detecting the pressure received by the brake pedal, converting the pressure into an electric signal and feeding the electric signal back to the vehicle control unit, and the vehicle control unit judges the braking intention of the driver according to the strength of the pressure signal and further outputs a braking signal with corresponding strength to the hydraulic actuating mechanism.
Preferably, the pressure sensing module assembly further comprises an accelerator pedal sensor, a front sensor and a rear sensor, the front sensor is arranged on a driving place floor in front of the brake pedal, the rear sensor is arranged on the driving place floor behind the brake pedal, and the accelerator pedal sensor is arranged on the surface of the accelerator pedal. The accelerator pedal sensor is used for testing whether a driver has an intention of vehicle acceleration, and when a pressure signal on the surface of an accelerator pedal is detected, the vehicle controller defaults that the driver has no intention of braking, and a hydraulic control signal does not output a braking signal; the front sensor is arranged on a driving position floor in front of the brake pedal, a driver can place the right heel in the area during daily driving, when the driver treads the brake pedal, the pressures of the brake pedal sensor and the front sensor are increased simultaneously, and the vehicle controller obtains the braking intention of the driver according to the signal, so that auxiliary braking is performed; the rear sensor is arranged on a driving position floor behind a brake pedal, pressure signals cannot be generated in the region under ordinary conditions, when foreign matters appear behind the brake pedal, the situation that the brake pedal cannot fall off can occur when a driver treads the brake pedal, treading pressure can be transmitted to an installation region of the rear sensor through the pedal-foreign matters, the rear sensor can generate pressure signals in the brake pedal sensor certainly at the moment, the front sensor can generate pressure signals according to driving habits of the driver, the whole vehicle controller performs weighted average calculation according to the three pressure signals to obtain final feedback information, the feedback information is compared with a preset braking threshold value, and braking is needed when the preset value is exceeded and the situation is judged.
Preferably, the braking device further comprises a vacuum boosting system, the vacuum boosting system comprises a vacuum pump and a vacuum booster connected with the brake, a vacuum degree sensor is arranged on the vacuum pump, and the vacuum degree sensor is electrically connected with the whole vehicle controller. The vacuum assist system comprises: the vacuum pump comprises parts such as an electric vacuum pump, a vacuum tank, a vacuum booster, a vacuum pipeline and the like, wherein the electric vacuum pump is used for pumping vacuum; the vacuum tank is used for storing the vacuum pumped by the electric vacuum pump, collecting a vacuum degree signal and controlling the trend of the vacuum; the vacuum booster is responsible for providing the driver with assistance, which has made it possible for the driver to provide sufficient braking strength with a low pedal effort, while this process is vacuum consuming. Therefore, whether the control strategy of the electric vacuum pump is reasonable or not is related to the braking capacity of the whole vehicle, and whether the vacuum pump can constantly maintain the capacity of providing vacuum or not has a profound influence on the safety of the whole vehicle for a new energy vehicle.
Preferably, the braking device comprises a hydraulic actuator, and the hydraulic actuator is connected with the brake. The hydraulic actuating mechanism is used for controlling a brake to brake a wheel hub, the ESC is provided with wheel speed sensors respectively at four wheels of the vehicle and used for detecting the motion states of the wheels, and meanwhile, the states of an accelerator pedal, a brake pedal and a steering wheel are monitored, the posture of a vehicle body is corrected in sequence, and a driver is assisted to obtain a stable vehicle running working condition. According to the invention, an active braking scheme independent of a vacuum boosting system is obtained by controlling a hydraulic actuating mechanism in a braking system by using the ESC and matching with the arrangement of a pressure sensing module component.
Preferably, the braking system further comprises an electronic parking system 7. The electronic parking system is a technology for realizing parking braking in an electronic control mode. The working principle of the brake is the same as that of a mechanical hand brake, and the brake is used for braking a wheel by driving a brake, such as a brake shoe or a brake caliper.
The invention also discloses a brake system and a control strategy for the new energy vehicle, which comprise the following steps:
s1: the braking device further comprises a vacuum power-assisted system, the vehicle control unit detects the working condition of the vacuum power-assisted system, if a working fault occurs, a fault lamp of the automobile instrument panel 8 flashes, and the step S2 is carried out; if the vacuum boosting system works normally, the vehicle control unit does not act;
s2: the vehicle control unit collects data collected by the vacuum degree sensor, detects feedback information of the pressure sensing module assembly if the vacuum degree value is reduced below a preset value, and enters step S3 if braking information is detected; if no braking information exists, no action is taken;
s3: the vehicle controller controls the vehicle electronic stability control system to work, the vehicle electronic stability control system drives the brake to brake, when the vehicle speed is reduced to a preset value, the feedback information of the pressure sensing module assembly is detected again, and if the brake information continues to be fed back, the step S4 is carried out; if no braking information exists, the automobile electronic stability control system is recovered, and the brake is released;
s4: the brake continuously works, the vehicle speed is reduced to 0, the vehicle control unit detects an accelerator pedal, if an intention signal is received, the vehicle electronic stability control system is recovered, the brake releases the brake, and if the intention signal is not received, the step S5 is carried out;
s5: and starting the vehicle parking system and parking the vehicle.
When the vacuum boosting system works normally, the automobile electronic stability control system serves as an auxiliary driving tool, does not undertake a main braking task, and assists a driver to drive the hydraulic braking system through the vacuum boosting system so as to complete braking; when the vacuum power-assisted system breaks down, the automobile electronic stability control system intervenes to take over the hydraulic actuating mechanism to control the brake, so that the effect of replacing the vacuum power-assisted system is achieved, and the new energy vehicle does not rely on the vacuum power-assisted system to assist the braking of the vehicle. The pressure sensing module assembly receives pressure signals of the sensors, the vehicle control unit analyzes the pressure signals and compares the pressure signals with a braking threshold value, so that the braking intention of a driver is judged, and more intelligent auxiliary vehicle braking is realized. Particularly, the vehicle control unit can gather the feedback information of the pressure sensing module assembly many times in the braking process, and whether the braking intention of the driver changes or not is judged according to the change condition of the feedback information, so that the braking strength of the vehicle is adjusted in cooperation with the driver, and the vehicle can work according to the intention of the driver. When the feedback information shows that the driver has the continuous braking intention, the ESC can ensure that the brake continuously works to stop the vehicle, and detect the pressure signal of the accelerator pedal, if the feedback of the pressure signal is not obtained, the vehicle control unit judges that the vehicle needs to be stopped for a long time, and at the moment, the EPB is started to park.
Preferably, the brake module assembly comprises a plurality of pressure sensors, and the feedback information of the brake module assembly received by the vehicle control unit is a weighted average of the signal values of the pressure sensors; and when the vehicle control unit receives the intention signal, ignoring the feedback information of the brake module assembly. When the hydraulic actuator is started to brake, the following two conditions are divided:
a) when the vehicle control unit confirms that the pressure signal is not detected by the accelerator pedal sensor, the pressure signal is added by the brake pedal, and the tiny pressure signal is not detected or detected by the rear sensor, the brake pressure value ratio capable of reflecting the driving intention is obtained by calculating the weighted average by adopting the following first formula:
the brake pressure value ratio is a brake pedal pressure value/K1 multiplied by 0.7+ front sensor pressure value/K2 multiplied by 0.3, in the formula, K1 is the maximum pressure average value of the pedal when an ordinary driver steps on the brake pedal, K2 is the maximum pressure average value of the heel when the ordinary driver steps on the brake pedal, and K1 and K2 are constant values obtained through experiments;
b) when the vehicle control unit confirms that the accelerator pedal sensor does not detect the pressure signal, the brake pedal sensor does not detect the pressure signal, and the rear sensor detects the pressure signal, the following second formula is adopted to calculate the weighted average to obtain the brake pressure value ratio capable of reflecting the driving intention:
the brake pressure value ratio is front sensor pressure value/K2 × 0.7+ rear sensor pressure value/K3 × 0.3, wherein K3 is the average value of the maximum pressure of the ordinary driver on the sole after stepping on the brake pedal, and K3 is a constant value obtained through tests. When the situation occurs, the vehicle control unit judges that the driver has the braking intention but steps on the brake pedal, at the moment, the braking pressure value ratio is corrected through a second formula, after the braking pressure value ratio is obtained, the braking pressure value ratio is compared with a preset braking pressure threshold value ratio, if the current braking pressure value ratio exceeds the braking pressure threshold value ratio, the hydraulic actuating mechanism controls the brake to brake the vehicle, and the braking deceleration obtains a proper value according to the vehicle type.
Preferably, in step S1, the vacuum boosting system includes a vacuum degree sensor, the vehicle control unit collects data collected by the vacuum degree sensor, detects feedback information of the pressure sensing module assembly if the vacuum degree value is reduced below a preset value, and proceeds to step S3 if braking information is detected; if no braking information exists, no action is taken. After the vacuum degree value is reduced to a certain range, the vacuum pump cannot supplement vacuum in time, and the problem of insufficient vacuum degree during subsequent braking is possibly caused, so that the whole vehicle controller can continuously detect feedback information of the pressure sensing module assembly, and the ESC can be ensured to replace a vacuum boosting system to intervene in vehicle braking at any time.
Therefore, the invention has the following beneficial effects: (1) the vehicle control system comprises a vehicle electronic stability control system, a vehicle control unit, a pressure sensor module, a brake control module and a vehicle brake control module, wherein the pressure sensor module is arranged at a driving position and used for feeding back operation information of a driver to the vehicle control unit; (2) the pressure sensing module assembly is of a multi-position structure, acquires the pressure of a brake pedal, the pressure of the front part of the brake pedal, the pressure of the rear part of the brake pedal and the pressure of an accelerator pedal respectively, and intelligently judges the braking intention of a driver under various conditions through a control strategy; (3) the pressure sensing module component can replace the traditional vacuum boosting type braking mode by matching with the braking mode of an automobile electronic stability control system, effectively reduces the manufacturing cost of a new energy automobile, reduces parts and combines a lightweight design concept.
Drawings
Fig. 1 is a schematic view of the operation of the brake system of the present invention.
FIG. 2 is a flow chart of a control strategy for the braking system of the present invention.
Fig. 3 is a schematic structural diagram of a pressure sensing module assembly according to the present invention.
In the figure: 1. the automobile brake system comprises a pedal body, 2, a pressure sensing module component, 21, a brake pedal sensor, 22, a front sensor, 23, a rear sensor, 3, a whole automobile controller, 4, an automobile electronic stability control system, 5, a hydraulic actuating mechanism, 51, a brake, 6, a vacuum boosting system, 7, an electronic parking system, 8, an instrument panel, 9 and a wheel speed sensor.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings. Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Examples
As shown in fig. 1, the braking system for the new energy vehicle comprises a braking device with a brake 51 and an electronic stability control system 4 connected to a vehicle controller 3, wherein the braking device comprises a pedal body 1 and a pressure sensing module assembly 2, the pressure sensing module assembly is respectively connected with the pedal body and a driving floor, the pressure sensing module assembly is electrically connected with the vehicle controller 3, and the vehicle controller 3 is connected with the brake 51. The automobile electronic stability control system is used for controlling the driving force and the braking force of front and rear wheels, left and right wheels, ensuring the lateral stability of vehicle running, adjusting the pressure of a wheel cylinder through the feedback information of a pressure control module component, so that a brake can effectively brake a hub, and a pressure sensing module on a driving position floor is mainly used for receiving the action condition of a driver, namely the tread condition of heels and soles on the driving position floor, and sequentially judging the braking intention of the driver. In the present embodiment, the brake 51 is a brake caliper.
As shown in fig. 3, the pressure sensing module assembly includes a brake pedal sensor 21 disposed on a surface of the brake pedal. The brake pedal sensor is used for detecting the pressure received by the brake pedal, converting the pressure into an electric signal and feeding the electric signal back to the vehicle controller, the vehicle controller judges the braking intention of a driver according to the intensity of the pressure signal, acquires the motion condition of the vehicle through the wheel speed sensor 9, and then outputs a braking signal corresponding to the corresponding intensity to the hydraulic actuating mechanism 5.
The pressure sensing module assembly further comprises an accelerator pedal sensor, a front sensor 22 and a rear sensor 23, the front sensor is arranged on the driving position floor in front of the brake pedal, the rear sensor is arranged on the driving position floor behind the brake pedal, and the accelerator pedal sensor is arranged on the surface of the accelerator pedal. The accelerator pedal sensor is used for testing whether a driver has an intention of vehicle acceleration, and when a pressure signal on the surface of an accelerator pedal is detected, the vehicle controller defaults that the driver has no intention of braking, and a hydraulic control signal does not output a braking signal; the front sensor is arranged on a driving position floor in front of the brake pedal, a driver can place the right heel in the area during daily driving, when the driver treads the brake pedal, the pressures of the brake pedal sensor and the front sensor are increased simultaneously, and the vehicle controller obtains the braking intention of the driver according to the signal, so that auxiliary braking is performed; the rear sensor is arranged on a driving position floor behind a brake pedal, pressure signals cannot be generated in the region under ordinary conditions, when foreign matters appear behind the brake pedal, the situation that the brake pedal cannot fall off can occur when a driver treads the brake pedal, treading pressure can be transmitted to an installation region of the rear sensor through the pedal-foreign matters, the rear sensor can generate pressure signals in the brake pedal sensor certainly at the moment, the front sensor can generate pressure signals according to driving habits of the driver, the whole vehicle controller performs weighted average calculation according to the three pressure signals to obtain final feedback information, the feedback information is compared with a preset braking threshold value, and braking is needed when the preset value is exceeded and the situation is judged.
The braking device further comprises a vacuum boosting system, the vacuum boosting system comprises a vacuum pump and a vacuum booster connected with the brake, a vacuum degree sensor is arranged on the vacuum pump, and the vacuum degree sensor is electrically connected with the whole vehicle controller. The vacuum assist system comprises: the vacuum pump comprises parts such as an electric vacuum pump, a vacuum tank, a vacuum booster, a vacuum pipeline and the like, wherein the electric vacuum pump is used for pumping vacuum; the vacuum tank is used for storing the vacuum pumped by the electric vacuum pump, collecting a vacuum degree signal and controlling the trend of the vacuum; the vacuum booster is responsible for providing the driver with assistance, which has made it possible for the driver to provide sufficient braking strength with a low pedal effort, while this process is vacuum consuming. Therefore, whether the control strategy of the electric vacuum pump is reasonable or not is related to the braking capacity of the whole vehicle, and whether the vacuum pump can constantly maintain the capacity of providing vacuum or not has a profound influence on the safety of the whole vehicle for a new energy vehicle.
The automobile electronic stability control system comprises a hydraulic actuating mechanism, and the hydraulic actuating mechanism is connected with a brake. The automobile electronic stability control system (ESC) system comprises an automobile traction control system TCS (traction control system), an automobile anti-lock system ABS (anti lock brake system) and an active yaw control system AYC (active Yawcontrol), and the ESC can improve the operation stability and the driving safety of the automobile under the dynamic working conditions of driving, braking and steering lamps. The ESC is provided with wheel speed sensors respectively at four wheels of the vehicle and is used for detecting the motion state of each wheel, simultaneously monitors the states of an accelerator pedal, a brake pedal and a steering wheel, corrects the posture of a vehicle body in sequence and assists a driver to obtain a relatively stable vehicle running condition. According to the invention, an active braking scheme independent of the vacuum boosting system 6 is obtained by controlling a hydraulic actuating mechanism in the braking system by using the ESC and matching with the arrangement of the pressure sensing module component.
The brake system further includes an electronic parking system. The electronic parking system is a technology for realizing parking braking in an electronic control mode. The working principle of the brake is the same as that of a mechanical hand brake, and the brake is used for braking a wheel by driving a brake, such as a brake shoe or a brake caliper.
As shown in fig. 2, the invention also discloses a brake system and a control strategy for a new energy vehicle, which comprises the following steps: s1: the braking device further comprises a vacuum power-assisted system, the vehicle control unit detects the working condition of the vacuum power-assisted system, if a working fault occurs, a fault lamp of an automobile instrument panel flashes, and the step S2 is carried out; if the vacuum boosting system works normally, the vehicle control unit does not act;
s2: the vehicle control unit collects data collected by the vacuum degree sensor, detects feedback information of the pressure sensing module assembly if the vacuum degree value is reduced below a preset value, and enters step S3 if braking information is detected; if no braking information exists, no action is taken;
s3: the vehicle control unit controls the hydraulic actuating mechanism to work, the hydraulic actuating mechanism drives the brake to brake, when the vehicle speed is reduced to a preset value, the feedback information of the pressure sensing module assembly is detected again, and if the brake information continues to be fed back, the step S4 is carried out; if no braking information exists, the hydraulic actuating mechanism is recovered, and the brake is released;
s4: the brake continuously works, the vehicle speed is reduced to 0, the vehicle control unit detects an accelerator pedal, if an intention signal is received, the hydraulic actuating mechanism is recovered, the brake is released, and if the intention signal is not received, the step S5 is carried out;
s5: and starting the vehicle parking system and parking the vehicle.
When the vacuum boosting system works normally, the hydraulic actuating mechanism serves as an auxiliary driving tool, does not undertake a main braking task, and assists a driver to drive the hydraulic braking system through the vacuum boosting system so as to complete braking; when the vacuum power-assisted system breaks down, the hydraulic actuating mechanism intervenes to take over the hydraulic system to control the brake, so that the effect of replacing the vacuum power-assisted system is achieved, and the new energy vehicle does not rely on the vacuum power-assisted system to assist the braking of the vehicle. The pressure sensing module assembly receives pressure signals of the sensors, the vehicle control unit analyzes the pressure signals and compares the pressure signals with a braking threshold value, so that the braking intention of a driver is judged, and more intelligent auxiliary vehicle braking is realized. Particularly, the vehicle control unit can gather the feedback information of the pressure sensing module assembly many times in the braking process, and whether the braking intention of the driver changes or not is judged according to the change condition of the feedback information, so that the braking strength of the vehicle is adjusted in cooperation with the driver, and the vehicle can work according to the intention of the driver. When the feedback information shows that the driver has the continuous braking intention, the ESC can ensure that the brake continuously works to stop the vehicle, and detect the pressure signal of the accelerator pedal, if the feedback of the pressure signal is not obtained, the vehicle control unit judges that the vehicle needs to be stopped for a long time, and at the moment, the EPB is started to park. The brake module assembly comprises a plurality of pressure sensors, and the feedback information of the brake module assembly received by the vehicle control unit is a weighted average of signal values of the pressure sensors; and when the vehicle control unit receives the accelerator pedal signal but does not receive the brake pedal information, ignoring the feedback information of the brake module assembly. When the hydraulic actuator is started to brake, the following two conditions are divided:
a) when the vehicle control unit confirms that the pressure signal is not detected by the accelerator pedal sensor, the pressure signal is added by the brake pedal, and the tiny pressure signal is not detected or detected by the rear sensor, the brake pressure value ratio capable of reflecting the driving intention is obtained by calculating the weighted average by adopting the following first formula:
the brake pressure value ratio is a brake pedal pressure value/K1 multiplied by 0.7+ front sensor pressure value/K2 multiplied by 0.3, in the formula, K1 is the maximum pressure average value of the pedal when an ordinary driver steps on the brake pedal, K2 is the maximum pressure average value of the heel when the ordinary driver steps on the brake pedal, and K1 and K2 are constant values obtained through experiments;
b) when the vehicle control unit confirms that the accelerator pedal sensor does not detect the pressure signal, the brake pedal sensor does not detect the pressure signal, and the rear sensor detects the pressure signal, the following second formula is adopted to calculate the weighted average to obtain the brake pressure value ratio capable of reflecting the driving intention:
the brake pressure value ratio is front sensor pressure value/K2 × 0.7+ rear sensor pressure value/K3 × 0.3, wherein K3 is the average value of the maximum pressure of the ordinary driver on the sole after stepping on the brake pedal, and K3 is a constant value obtained through tests. When the situation occurs, the vehicle control unit judges that the driver has the braking intention but steps on the brake pedal empty, and at the moment, the braking pressure value ratio is corrected through a second formula. According to the GB12676-1999 Standard of automobile brake system Structure, Performance and test method, the control force of the passenger vehicle pedal is not more than 500N, the control force of the commercial vehicle pedal is not more than 700N, according to the test data, in the embodiment, K1 takes the value of 400N, K2 takes the value of 250N, and K3 takes the value of 150N.
And after the braking pressure value ratio is obtained according to a formula, the braking pressure value ratio is compared with a preset braking pressure threshold value ratio, in the embodiment, the braking pressure threshold value ratio determines a pressure ratio according to the pressure intensity of the heel of the driver to the front processor under the normal production condition, the value is 1, if the current braking pressure value ratio exceeds the braking pressure threshold value ratio, the hydraulic actuating mechanism controls the brake to brake the vehicle, and the braking deceleration obtains a proper value according to the vehicle type. In the step S1, the vacuum boosting system comprises a vacuum degree sensor, the vehicle control unit collects data collected by the vacuum degree sensor, if the vacuum degree value is reduced below a preset value, feedback information of the pressure sensing module assembly is detected, and if braking information is detected, the step S3 is executed; if no braking information exists, no action is taken. In this embodiment, when the vacuum value is less than-40 Kpa, it indicates that the vacuum pump cannot supplement vacuum in time, which may cause a problem of insufficient vacuum during subsequent braking, so that the vehicle controller may continuously detect feedback information of the pressure sensing module assembly, and ensure that the ESC can replace the vacuum boosting system to intervene in vehicle braking at any time.
In addition to the above embodiments, the technical features of the present invention can be re-selected and combined to form new embodiments within the scope of the claims and the specification of the present invention, which are all realized by those skilled in the art without creative efforts, and thus, the embodiments of the present invention which are not described in detail should be regarded as the specific embodiments of the present invention and are within the protection scope of the present invention.
Claims (9)
1. The utility model provides a braking system for new energy vehicle, is including the arresting gear who is provided with stopper (51) and connect in automotive electronics stable control system (4) of vehicle control unit (3), characterized by, arresting gear includes footboard body (1) and pressure sensing module subassembly (2), pressure sensing module subassembly (2) are connected with footboard body (1) and driving position floor respectively, pressure sensing module subassembly (2) are connected with vehicle control unit (3) electricity, vehicle control unit (3) are connected with stopper (51).
2. The brake system for the new energy vehicle as defined in claim 1, wherein the pressure sensing module assembly (2) comprises a brake pedal sensor, and the brake pedal sensor is arranged on the surface of the brake pedal.
3. The brake system for the new energy vehicle as defined in claim 1, wherein the pressure sensing module assembly (2) further comprises an accelerator pedal sensor, a front sensor and a rear sensor, the front sensor is disposed on a driving floor in front of the brake pedal, the rear sensor is disposed on a driving floor behind the brake pedal, and the accelerator pedal sensor is disposed on a surface of the accelerator pedal.
4. The braking system for the new energy vehicle as claimed in claim 1, wherein the braking device comprises a hydraulic actuator (5), and the hydraulic actuator (5) is connected with the brake (51).
5. The braking system for the new energy vehicle as claimed in claim 4, wherein the braking device further comprises a vacuum boosting system (6), the vacuum boosting system (6) comprises a vacuum pump and a vacuum booster connected with the brake (51), a vacuum degree sensor is arranged on the vacuum pump, the vacuum degree sensor is electrically connected with the vehicle control unit (3), and the vacuum boosting system (6) is connected with the hydraulic actuator (5).
6. The brake system for the new energy vehicle as claimed in claim 1, wherein the brake system further comprises an electronic parking system (7).
7. The brake control strategy of the brake system for the new energy vehicle according to any one of claims 1 to 6, characterized by comprising the following steps:
s1: the braking device further comprises a vacuum power-assisted system (6), the vehicle control unit (3) detects the working condition of the vacuum power-assisted system (6), if a working fault occurs, a fault lamp of the automobile instrument panel (8) flashes, and the step S2 is carried out; if the vacuum boosting system (6) works normally, the vehicle control unit (3) does not act;
s2: the vehicle control unit (3) collects data collected by the vacuum degree sensor, detects feedback information of the pressure sensing module assembly (2) if the vacuum degree value is reduced below a preset value, and enters step S3 if braking information is detected; if no braking information exists, no action is taken;
s3: the vehicle control unit (3) controls the vehicle electronic stability control system (4) to work, the vehicle electronic stability control system (4) drives the brake (51) to brake, when the vehicle speed is reduced to a preset value, the feedback information of the pressure sensing module assembly (2) is detected again, and if the feedback information of the brake continues, the step S4 is carried out; if no braking information exists, the automobile electronic stability control system (4) is recovered, and the brake (51) releases braking;
s4: the brake (51) continuously works, the vehicle speed is reduced to 0, the vehicle controller (3) detects an accelerator pedal, if an accelerator signal is received, the vehicle electronic stability control system (4) recovers, the brake (51) releases the brake, and if no accelerator signal exists, the step S5 is carried out;
s5: and (5) parking the vehicle.
8. The brake control strategy of the brake system for the new energy vehicle according to claim 7, wherein the brake module assembly comprises a plurality of pressure sensors, and the feedback information of the brake module assembly received by the vehicle control unit (3) is a weighted average of the signal values of the pressure sensors; and when the vehicle control unit (3) receives the throttle signal, the feedback information of the brake module assembly is ignored.
9. The brake control strategy of the brake system for the new energy vehicle according to claim 7, wherein in step S1, the vacuum boosting system (6) includes a vacuum degree sensor, the vehicle control unit (3) collects data collected by the vacuum degree sensor, detects feedback information of the pressure sensing module assembly (2) if the vacuum degree value is reduced below a preset value, and proceeds to step S3 if brake information is detected; if no braking information exists, no action is taken.
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