CN210707367U

CN210707367U - Parallel hybrid braking system

Info

Publication number: CN210707367U
Application number: CN201921743214.2U
Authority: CN
Inventors: 江涛; 张勇; 张珊珊
Original assignee: Chery and Wanda Guizhou Bus Co Ltd
Current assignee: Chery and Wanda Guizhou Bus Co Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-06-09
Anticipated expiration: 2029-10-17

Abstract

The utility model discloses a parallelly connected hybrid brake system, including master cylinder and booster, position sensor, brake pedal, whole car the control unit, the fast sensor of wheel, the axle, the braking piece, braking pincers, the brake the control unit, energy storage system and motor control unit, whole car the control unit electric connection to brake the control unit, energy storage system, motor control unit, the fast sensor of wheel and position sensor and brake pipe way oil pressure sensor, the fast sensor of wheel of four-wheel is connected to the brake control unit electricity, and through pipe connection to four-wheel braking pincers and master cylinder and booster, master cylinder and booster are connected to brake pedal, install position sensor on the brake pedal, motor control unit electricity is connected to energy storage system. The utility model discloses when the brake state, the motor does not produce the electric energy and gives the drive wheel, converts the generator into through the contravariant, and the mechanical energy that the generator will brake the production turns into the electric energy and stores in the battery, has improved whole car efficiency, has prolonged the continuation of the journey mileage.

Description

Parallel hybrid braking system

Technical Field

The utility model relates to a parallelly connected hybrid brake system.

Background

The biggest difference between the hybrid electric vehicle and the pure electric vehicle as well as the traditional fuel vehicle lies in the power source, and the hybrid electric vehicle has a double-power-source structure of a motor and an engine. The motor has the characteristics of environmental protection, high efficiency and the like, but the dynamic property is not strong and the endurance is weak. The engine has long driving distance and strong power, but can generate a large amount of waste gas pollution. The regenerative braking energy feedback control strategy has the function of realizing the mutual coordination and supplement between the motor and the engine, and under different working conditions, according to the instruction of a driver, the effect of the energy feedback control strategy is to find the optimal balance point of the regenerative braking force and the hydraulic braking force under the dynamic condition, so that the braking energy is maximally recovered on the premise of meeting the driving safety, and the effect of increasing the endurance mileage of the electric vehicle is achieved.

When traditional car braking, the heat energy that its produced can be through the form of heat transfer or heat exchange, give off heat energy to the air so that can't utilize, wasted the energy greatly, and electric automobile who has regenerative braking device is under the regenerative braking mode, and the motor plays the effect of generator, and the unnecessary mechanical energy who produces when braking with the car is converted into the electric energy and is stored and utilize in the battery to effectual continuation of the journey mileage that has improved.

When the automobile is under the urban working condition, the road is blocked, the automobile needs to be frequently braked and started and stopped, a large amount of energy is consumed, if the automobile can effectively absorb the part of wasted energy, the endurance mileage of the electric automobile can be improved by 10 to 30 percent in the original degree, and therefore a high-efficiency energy recovery strategy can be developed, and the development of the hybrid electric automobile is particularly critical by matching with an effective energy recovery device.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: a parallel hybrid brake system is provided to solve the problems in the prior art.

The utility model discloses the technical scheme who takes does: the utility model provides a parallel connection hybrid brake control system, including master cylinder and booster, position sensor, the brake pedal, whole car the control unit, the wheel speed sensor, the axle, the braking piece, braking pincers, the brake control unit, energy storage system and motor control unit, whole car the control unit electricity is connected to the brake control unit, energy storage system, motor control unit, wheel speed sensor and position sensor and brake pipe oil pressure sensor, the wheel speed sensor of brake control unit electricity connection to four-wheel, and be connected to the braking pincers and the master cylinder and the booster of four-wheel through the pipeline, master cylinder and booster are connected to the brake pedal, install position sensor on the brake pedal, motor control unit's motor is connected to the axle, motor control unit electricity is connected to energy storage system, install the braking piece that braking pincers match.

The motor of the motor control unit is connected to a mechanical coupler, the mechanical coupler is connected to the gearbox and the engine, the engine is connected to the oil tank through a pipeline, and the motor is electrically connected to a battery of the energy storage system through a power converter.

The utility model has the advantages that: compared with the prior art, the utility model discloses an effect as follows:

1) in order to meet different working conditions, a high-power engine is usually loaded on a traditional fuel automobile for speed support and slope climbing, however, under a plurality of working conditions, the engine usually works in a state of small load and high oil consumption, and the economical efficiency is greatly reduced due to the addition of the motor, compared with the traditional fuel automobile, the control method of the hybrid electric automobile of the utility model has the advantages that an energy transmission path is added, so that the effect of assisting the engine to provide driving energy is achieved, the equipped engine works in a more efficient working area, and the effects of energy conservation and emission reduction are achieved;

2) under the low-speed running condition, the hybrid electric vehicle usually only adopts the principle of motor work, thereby realizing zero emission of waste gas;

3) the utility model discloses when the brake state, the motor can not produce the electric energy and give the drive wheel, and conversely convert the generator into through the contravariant, and the mechanical energy that the generator produced with the braking turns into the electric energy and stores in the battery this moment, has improved whole car efficiency, has prolonged the continuation of the journey mileage.

Drawings

FIG. 1 is a schematic diagram of the control structure of the present invention;

fig. 2 is a parallel hybrid powertrain architecture diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1: as shown in fig. 1-2, a parallel hybrid brake control system includes a master cylinder and booster 1, a position sensor 2, a brake pedal 3, a vehicle control unit 4, a wheel speed sensor 5, an axle 6, a brake pad 7, a brake caliper 8, a brake control unit 9, an energy storage system 10, and a motor control unit 11, the vehicle control unit 4 is electrically connected to the brake control unit 9, the energy storage system 10, the motor control unit 11, the wheel speed sensor 5, the position sensor 2 for detecting a change in pedal position, and a brake line oil pressure sensor 13, the brake control unit 9 is electrically connected to the wheel speed sensor 5 of four wheels and is connected to the brake caliper 8 of the four wheels and the master cylinder and booster 1 through pipes, the master cylinder and booster 1 are connected to the brake pedal 3, the position sensor 2 is mounted on the brake pedal 3, a motor of the motor control unit 11 is, the motor control unit 11 is electrically connected to the energy storage system 10, the brake disc 7 matched with the brake caliper 8 is installed on the axle 6, and the brake pipeline oil pressure sensor 13 is installed on the liquid inlet pipeline of the main cylinder and the booster 1.

The electric machine of the electric machine control unit 11 is connected to a mechanical coupler, which is connected to the transmission and the engine, the engine is connected to the oil tank through a pipe, and the electric machine is electrically connected to the battery of the energy storage system 10 through a power converter.

Example 2: as shown in fig. 2, the parallel structure is as shown in fig. 2, the driving system is composed of an engine and a motor, both of which can independently provide driving energy for the vehicle and also can simultaneously provide driving energy, so that the hybrid vehicle with the parallel structure has three driving modes, which is similar to the conventional vehicle, and when the vehicle brakes, the motor can be used as a generator to recover braking energy and store the energy in the battery pack.

The three working modes can be effectively combined with a parallel driving mode, for example, when starting, the engine is closed, and the motor is independently started; when the climbing road section is preset, if the power of the engine is insufficient, the motor operates in an auxiliary mode, and the power is increased; when the automobile is accelerated, the motor can also participate in acceleration, and when the automobile is driven in a deceleration state, the motor is quitted from running. Under various different working conditions, the hybrid electric vehicle with the parallel structure can be selected according to the requirements of actual conditions, so that the respective advantages of the motor and the engine are exerted to the greatest extent.

A parallel hybrid brake control method comprises the following steps: the parallel hybrid power drive adopts an engine and a motor drive, when starting, the engine is closed, and the motor is independently started; when the climbing road section is preset, if the power of the engine is lower than a set value, the motor operates in an auxiliary mode; when the automobile is accelerated, the motor runs, and when the automobile runs in a deceleration state, the motor quits running; the energy feedback control method adopted when the motor is in a deceleration or braking condition comprises the following steps: the gearbox of the electric automobile transmits a part of mechanical energy to the motor through the mechanical coupler, the motor is controlled to be used as a generator to generate electricity, and the generated electric energy is stored in the battery through the inverter.

The energy feedback control system in the parallel hybrid braking system is composed of two independent systems, namely a hydraulic braking system and a regenerative braking system, when the electric automobile works in a regenerative braking mode (deceleration or braking condition), a part of mechanical energy on the electric automobile is transmitted to the motor, and through the regenerative control system, the motor at the moment is used as a motor, so that redundant mechanical energy is converted into electric energy and is stored in the battery through the inverter, the simultaneous collection and reutilization of the redundant mechanical energy are realized, and the effects of energy conservation and emission reduction are realized.

The parallel hybrid brake system comprises three control units which form the system, namely a motor control unit 11, a brake control unit 9 and a vehicle control unit 4. The whole vehicle control unit 4 is a control unit at the topmost layer as a brain of the electric vehicle, and realizes the control of the whole vehicle energy by means of an input control strategy. The second layer of the control system is constituted by the motor control unit 11 and the brake control unit 9, and controls the hydraulic braking force and the regenerative braking force, respectively.

When the brake control unit brakes: according to the travel of a driver for stepping on a pedal, the torque and the braking force required by the automobile are calculated, meanwhile, according to the current speed of the automobile and the adhesion condition of the current running road surface (determined by a slip rate parameter), through an energy feedback control method, according to the actual condition (the condition is that the brake consumption of a brake is generally lost into the air through friction heat dissipation, and is wasted, if the regenerative brake of the part can be used for traction braking, energy can be saved and recovered, but the traction brake of the part is small and is not enough to stop the automobile, if the emergency condition is met, the emergency brake is needed, the brake recovery brake is not good, the emergency brake can be realized only through forced interference of full hydraulic brake, and the emergency brake is usually used for braking when the emergency condition is not met, so that the braking effect on the automobile can be prevented, also can recover energy) to redistribute the hydraulic braking force and the regenerative braking force (when meeting an emergency, the regenerative braking does not work, the hydraulic braking full-force brake), and feed back the final calculation result to the whole vehicle control unit, the whole vehicle control unit calculates the regenerative braking target torque according to the current SOC value of the battery and the vehicle speed, and transmits the instruction to the motor control unit, and the current torque value is also fed back to the braking control unit, the braking control unit receives the feedback of the actual torque value, compares the actual torque value with the target torque value, and determines the final friction target value (the ABS control method is adopted, the calibration method is adopted to realize, the determined friction is the braking force which needs to be generated, the braking force is large, the braking force is linear according to the oil pressure, the braking force is not big when stepping on the brake, the ABS calibration is needed to be carried out on different road surfaces under different adhesion coefficients, determine different braking forces).

Compared with the traditional fuel oil automobile, the utility model has the advantages that an energy transmission path is added, so that the effect of assisting the engine to provide driving energy is achieved, the equipped engine works in a more efficient working area, and the effects of energy conservation and emission reduction are achieved; under the low-speed running condition, the hybrid electric vehicle usually only adopts the principle of motor work, thereby realizing zero emission of waste gas; when the vehicle is in a braking state, the motor can not generate electric energy to the driving wheel, and the electric energy is converted into the generator through inversion, and the mechanical energy generated by braking is converted into the electric energy by the generator and stored in the storage battery, so that the efficiency of the whole vehicle is improved, and the endurance mileage is prolonged.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention, therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A parallel hybrid brake system, characterized by: comprises a master cylinder and a booster (1), a position sensor (2), a brake pedal (3), a whole vehicle control unit (4), a wheel speed sensor (5), an axle (6), a brake pad (7), a brake caliper (8), a brake control unit (9), an energy storage system (10) and a motor control unit (11), wherein the whole vehicle control unit (4) is electrically connected to the brake control unit (9), the energy storage system (10), the motor control unit (11), the wheel speed sensor (5), the position sensor (2) and a brake pipeline oil pressure sensor (13), the brake control unit (9) is electrically connected to the wheel speed sensor (5) of four wheels and is connected to the brake caliper (8) of the four wheels, the master cylinder and the booster (1) through pipelines, the brake pipeline oil pressure sensor (13) is connected to the pipelines of the master cylinder and the booster (1), the master cylinder and the booster (1) are, a position sensor (2) is installed on the brake pedal (3), a motor of a motor control unit (11) is connected to an axle (6), the motor control unit (11) is electrically connected to an energy storage system (10), and a brake disc (7) matched with a brake caliper (8) is installed on the axle (6).

2. A parallel hybrid brake system according to claim 1, wherein: the motor of the motor control unit (11) is connected to a mechanical coupler, the mechanical coupler is connected to a gearbox and an engine, the engine is connected to a fuel tank through a pipeline, and the motor is electrically connected to a battery of the energy storage system (10) through a power converter.