CN112009444A - Composite braking system of electric vehicle - Google Patents

Composite braking system of electric vehicle Download PDF

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Publication number
CN112009444A
CN112009444A CN202010851536.XA CN202010851536A CN112009444A CN 112009444 A CN112009444 A CN 112009444A CN 202010851536 A CN202010851536 A CN 202010851536A CN 112009444 A CN112009444 A CN 112009444A
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China
Prior art keywords
brake
braking
vehicle
max
hydraulic
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Pending
Application number
CN202010851536.XA
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Chinese (zh)
Inventor
郑竹安
石小龙
熊新
翟豪瑞
孙婷婷
戴广金
邵俊
肖海宁
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Yancheng Institute of Technology
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Yancheng Institute of Technology
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Priority to CN202010851536.XA priority Critical patent/CN112009444A/en
Publication of CN112009444A publication Critical patent/CN112009444A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to the field of service braking of electric vehicles, and discloses a composite braking system of an electric vehicle, which comprises a brake pedal position sensor, a timer, two driving motors, a vehicle speed sensor, four sets of hydraulic brakes, a hydraulic brake controller, a battery energy management system, a brake gear regulator and an ECU (electronic control unit), wherein the ECU is electrically connected with the brake pedal position sensor, the timer, the vehicle speed sensor, the driving motor controller, the hydraulic brake controller, the battery energy management system and the brake gear regulator. The invention can utilize the regenerative braking force of the motor to carry out energy recovery rate during light braking, and provides braking by hydraulic braking force during high-intensity braking, thereby ensuring the braking efficiency.

Description

Composite braking system of electric vehicle
Technical Field
The invention relates to the field of service braking of electric vehicles, in particular to a composite braking system of an electric vehicle.
Background
Compared with the traditional hydraulic braking system, the electro-hydraulic composite braking system has the advantages of good braking stability, certain energy recovery rate and the like, so that the composite braking system and the composite braking method thereof are needed, wherein the energy recovery rate can be realized by utilizing the regenerative braking force of the motor during light braking, and the braking is provided by the hydraulic braking force during high-strength braking, so that the braking efficiency is ensured.
Disclosure of Invention
The present invention provides a composite brake system for an electric vehicle, comprising,
the brake pedal position sensor is arranged at the brake pedal and used for acquiring the pedal stepping stroke;
a timer for acquiring the time t from the pedal displacement to the stop;
two drive motors for driving two front wheels and two rear wheels of the vehicle, respectively;
the vehicle speed sensor is arranged on the vehicle and used for acquiring the instant speed v of the vehicle;
the driving motor controller is used for controlling the working mode and the output torque of the driving motor;
four sets of hydraulic brakes are respectively used for applying braking force to the brake discs on the front and rear hubs;
a hydraulic brake controller for adjusting a braking torque of the hydraulic brake;
the battery energy management system is used for acquiring the state of charge (SoC) of the battery;
the brake gear adjuster is used for adjusting the brake sensitivity of the vehicle;
and the ECU is electrically connected with the brake pedal position sensor, the timer, the vehicle speed sensor, the driving motor controller, the hydraulic brake controller, the battery energy management system and the brake gear regulator.
The invention also provides a compound braking method for the compound braking system of the electric vehicle, which comprises the following steps:
step one, judging the brake sensitivity, determining a P value, and P = d1/d2,
Wherein d is1Is the current gear value, d2Is a total gear value;
step two, judging the braking mode of the vehicle,
when the SOC is more than a and less than or equal to 100 percent and the v is more than or equal to 110km/s or the v is less than 10km/s, the vehicle adopts a hydraulic braking mode, otherwise, a motor regenerative braking mode is adopted, wherein a is variable and is set by a vehicle control system,
0≤a＜100；
step three, judging the braking demand of the driver,
when t is less than or equal to 0.7s, and the current travel displacement L of the pedal1Greater than 0.5 (1-p) L of the maximum travel of the pedalmaxWhen the maximum braking force F is adopted by the hydraulic brake controlled by the hydraulic controllerLiquid maxA brake or drive motor controller controls the drive motor to maximize regenerative braking torque TElectric maxAnd (c) braking, wherein,
A=(L1-L0) Tb, wherein L0For the last time the travel of the brake pedal within the time t is counted, when L1≥L0When L, b =1, when L1＜L0When the ratio of b =0 is greater than or equal to 0,
when the single displacement speed A of the pedal is less than B, the braking force F1=(1+P)L1FLiquid max/LmaxOr braking torque T1=(1+P)L1TElectric max/2Lmax，
F1Not more than FThe amount of the liquid max is such that,T1not more than TElectric max。
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application:
fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, the present embodiment provides a technical solution:
a composite brake system of an electric vehicle includes,
the brake pedal position sensor 1 is arranged at a brake pedal and used for acquiring the pedal stepping stroke;
a timer 2 for acquiring a time t from the pedal displacement from the start to the stop;
two drive motors 3 for driving two front wheels and two rear wheels of the vehicle, respectively;
the vehicle speed sensor 4 is arranged on the vehicle and used for acquiring the instant speed v of the vehicle;
a driving motor controller 5 for controlling the operation mode and output torque of the driving motor 3;
four sets of hydraulic brakes 6 which are respectively used for applying braking force to the brake discs on the front and rear wheel hubs;
a hydraulic brake controller 7 for adjusting a braking torque of the hydraulic brake 6;
the battery energy management system 8 is used for acquiring the state of charge (SoC) of the battery;
a brake gear adjuster 9 for adjusting the brake sensitivity of the vehicle;
and the ECU10 is electrically connected with the brake pedal position sensor 1, the timer 2, the vehicle speed sensor 3, the driving motor controller 5, the hydraulic brake controller 7, the battery energy management system 8 and the brake gear regulator 9.
A compound braking method for a compound braking system of the above-described electric vehicle, the compound braking method comprising the steps of:
step one, judging the brake sensitivity, determining a P value, and P = d1/d2,
Wherein d is1Is the current gear value, d2D in this embodiment is the total gear value1Is 1, d2Is 5;
step two, judging the braking mode of the vehicle,
when the SOC is more than a and less than or equal to 100 percent and the v is more than or equal to 110km/s or the v is less than 10km/s, the vehicle adopts a hydraulic braking mode, otherwise, a regenerative braking mode of a motor is adopted, wherein a is variable and is set by a vehicle control system, in the embodiment, 50 is taken as a,
step three, judging the braking demand of the driver,
when t is less than or equal to 0.7s, and the current travel displacement L of the pedal1Greater than 0.5 (1-p) L of the maximum travel of the pedalmaxWhen the maximum braking force F is adopted by the hydraulic brake controlled by the hydraulic controllerLiquid maxA brake or drive motor controller controls the drive motor to maximize regenerative braking torque TElectric maxAnd (c) braking, wherein,
A=(L1-L0) Tb, wherein L0For the last time the travel of the brake pedal within the time t is counted, when L1≥L0When L, b =1, when L1＜L0When the ratio of b =0 is greater than or equal to 0,
when t is greater than 0.7s, the braking force F1=(1+P)L1FLiquid max/LmaxOr braking torque T1=(1+P)L1TElectric max/2Lmax，
F1Not more than FThe amount of the liquid max is such that,T1not more than TElectric max。
Compared with the prior art, the beneficial effect of this technical scheme is:
according to the technical scheme, the corresponding braking force can be selected according to the urgent degree of the brake of a driver, meanwhile, when the brake is lightly performed, the energy recovery rate is performed by using the regenerative braking force of the motor, and when the brake is performed with high strength, the brake is provided by the hydraulic braking force, so that the brake efficiency is ensured.
The technical scheme can also adjust the sensitivity of the brake according to the use habit of the driver to meet the driving preference of different users.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The emergency jacking device for the vehicle provided by the invention is described in detail above. The principles and embodiments of the present invention have been explained by applying specific examples, and the above descriptions of the embodiments are only used to help understanding the method and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (2)

1. A composite brake system of an electric vehicle, characterized by comprising,
the brake pedal position sensor (1) is arranged at the brake pedal and used for acquiring the pedal stepping stroke;
a timer (2) for acquiring the time t from the pedal displacement to the stop;
two drive motors (3) for driving two front wheels and two rear wheels of the vehicle, respectively;
the vehicle speed sensor (4) is arranged on the vehicle and used for acquiring the instant speed v of the vehicle;
a drive motor controller (5) for controlling the operating mode and output torque of the drive motor (3);
four sets of hydraulic brakes (6) are respectively used for applying braking force to the brake discs on the front and rear hubs;
a hydraulic brake controller (7) for adjusting the braking torque of the hydraulic brake (6);
a battery energy management system (8) for obtaining a state of charge (SoC) of the battery;
a brake gear adjuster (9) for adjusting the brake sensitivity of the vehicle;
and the ECU (10) is electrically connected with the brake pedal position sensor (1), the timer (2), the vehicle speed sensor (3), the driving motor controller (5), the hydraulic brake controller (7), the battery energy management system (8) and the brake gear regulator (9).
2. A compound braking method for a compound braking system of an electric vehicle according to claim 1, characterized by comprising the steps of:
step one, judging the brake sensitivity, determining a P value, and P = d1/d2,
Wherein d is1Is the current gear value, d2Is a total gear value;
step two, judging the braking mode of the vehicle,
when the SOC is more than a and less than or equal to 100 percent and the v is more than or equal to 110km/s or the v is less than 10km/s, the vehicle adopts a hydraulic braking mode, otherwise, a motor regenerative braking mode is adopted, wherein a is variable and is set by a vehicle control system,
0≤a＜100；
step three, judging the braking demand of the driver,
when t is less than or equal to 0.7s and the pedal is asFront stroke displacement L1Greater than 0.5 (1-p) L of the maximum travel of the pedalmaxWhen the maximum braking force F is adopted by the hydraulic brake controlled by the hydraulic controllerLiquid maxA brake or drive motor controller controls the drive motor to maximize regenerative braking torque TElectric maxAnd (c) braking, wherein,
A=(L1-L0) Tb, wherein L0For the last time the travel of the brake pedal within the time t is counted, when L1≥L0When L, b =1, when L1＜L0When the ratio of b =0 is greater than or equal to 0,
when the single displacement speed A of the pedal is less than B, the braking force F1=(1+P)L1FLiquid max/LmaxOr braking torque T1=(1+P)L1TElectric max/2Lmax，
F1Not more than FLiquid max，T1Not more than TElectric max。
CN202010851536.XA 2020-08-21 2020-08-21 Composite braking system of electric vehicle Pending CN112009444A (en)

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Application Number Priority Date Filing Date Title
CN202010851536.XA CN112009444A (en) 2020-08-21 2020-08-21 Composite braking system of electric vehicle

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113635878A (en) * 2021-08-16 2021-11-12 盐城工学院 Composite braking system of electric automobile
CN114670673A (en) * 2022-03-11 2022-06-28 凯博易控车辆科技(苏州)股份有限公司 Braking torque control system and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332184A (en) * 2013-06-08 2013-10-02 北京航空航天大学 Electric-hydro complex brake control method for electric vehicle use and controlling device thereof
CN105459836A (en) * 2015-12-02 2016-04-06 安徽农业大学 Composite braking rapid control system and method of three-motor electric car
CN109177965A (en) * 2018-10-12 2019-01-11 东风商用车有限公司 A kind of intelligentized vehicle auxiliary braking control system and its control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103332184A (en) * 2013-06-08 2013-10-02 北京航空航天大学 Electric-hydro complex brake control method for electric vehicle use and controlling device thereof
CN105459836A (en) * 2015-12-02 2016-04-06 安徽农业大学 Composite braking rapid control system and method of three-motor electric car
CN109177965A (en) * 2018-10-12 2019-01-11 东风商用车有限公司 A kind of intelligentized vehicle auxiliary braking control system and its control method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
彭海兰;梅一丹;朱今镜;李振中;: "电动汽车制动能量回馈控制策略的分析", 汽车工程师, no. 02, 25 February 2020 (2020-02-25) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113635878A (en) * 2021-08-16 2021-11-12 盐城工学院 Composite braking system of electric automobile
CN113635878B (en) * 2021-08-16 2022-11-15 盐城工学院 Composite braking system of electric automobile
CN114670673A (en) * 2022-03-11 2022-06-28 凯博易控车辆科技(苏州)股份有限公司 Braking torque control system and method
CN114670673B (en) * 2022-03-11 2024-02-27 凯博易控车辆科技(苏州)股份有限公司 Braking torque control system and method

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