CN104627171A - Hybrid power automobile electronic control method - Google Patents

Abstract

The invention provides a hybrid power automobile electronic control method, and belongs to the technical field of the automobile control. A driving circuit, a driving power generating conversion circuit and an engine ECU are controlled by a main control circuit in a coordinated mode so that a hybrid power automobile can work in different states. The working states of the hybrid power automobile comprise: a start-up state, an accelerating state, a cruising and driving state and a braking-energy recycling power generating state. Further detailing is carried out on working modes during the cruising and driving state, so that the power performance and the fuel economical efficiency of the hybrid power automobile under an actual working condition are closer to the performance in an optimal state. Accordingly, the power performance and the fuel economical efficiency of hybrid power automobile are improved. In addition, a braking-energy recycling function is achieved, so that the cruising mileage is remarkably improved.

Description

Hybrid Electric Vehicle Electronic Control Method

technical field

The invention provides an electric control method for a hybrid electric vehicle, which belongs to the technical field of electric vehicle control.

Background technique

The electronic control method of hybrid electric vehicles is the key technology to determine the power and fuel economy of hybrid electric vehicles, and plays an important role in improving the performance of the whole vehicle and reducing the production cost. At present, most of the electronic control methods of hybrid electric vehicles are based on the vehicle's working mode to control the vehicle torque output, but the division of the vehicle's working mode is not detailed enough to select the best control method according to the actual operating conditions of the hybrid vehicle, and some There is no braking energy recovery function, so that the power performance, fuel economy and emission performance of the hybrid electric vehicle under actual working conditions are far from the best performance, and its performance needs to be further improved.

Contents of the invention

The object of the present invention is to provide an electronic control method for a hybrid electric vehicle that can overcome the above-mentioned defects, divide the working modes of the whole vehicle in more detail, have the function of recovering braking energy, and significantly improve the power and fuel economy of the hybrid electric vehicle. The technical content is:

The electronic control method of a hybrid electric vehicle, the main control circuit coordinates and controls the driving circuit, the driving power generation conversion circuit and the engine ECU, so that the hybrid electric vehicle can work in different states, and it is characterized in that: the working state of the hybrid electric vehicle is divided into: starting state, acceleration state, cruising state and braking energy recovery power generation state;

When the hybrid electric vehicle is in the starting state, it is driven in pure electric mode. The main control circuit receives the starting signal from the driver. The main control circuit automatically shuts down the drive generation conversion circuit, and protects the drive generation conversion circuit and voltage stabilization circuit. The control circuit confirms the voltage of the battery required for starting, and at the same time calculates the pulse signal required for starting, and then sends it to the driving circuit. The driving circuit amplifies the power of the driving pulse signal and sends it to the inverter circuit. The inverter circuit controls the current on and off and Convert the DC power of the battery into three-phase AC power and send it to the drive motor, so that the hybrid vehicle can start running;

When the hybrid vehicle is accelerating, the main control circuit receives the acceleration signal from the driver and detects the power signal of the driving motor. When the actual power of the driving motor does not reach 80% of the rated power, the main control circuit Calculate the acceleration pulse signal that the driving motor should provide, and transmit it to the driving motor through the driving circuit and the inverter circuit. The control circuit receives the acceleration signal from the driver, and calculates the fuel injection ignition signal when the engine is running at the highest efficiency. The main control circuit transmits the fuel injection ignition signal to the engine ECU, and the engine ECU controls the engine to run at the highest efficiency. According to the acceleration signal, the circuit calculates the acceleration pulse signal that the drive motor should provide power to meet the acceleration requirements. The main control circuit transmits the acceleration pulse signal to the drive circuit, and the drive circuit amplifies the power of the acceleration pulse signal and inputs it to the inverter circuit. The inverter circuit controls the current on and off and converts the DC power of the battery into a three-phase AC power and sends it to the drive motor. At this time, the hybrid vehicle adopts the hybrid mode in which the engine and the drive motor work at the same time to accelerate;

When the hybrid vehicle is cruising, the main control circuit first receives the vehicle speed signal and confirms the vehicle speed. In the first state, when the vehicle speed is less than 80km/h, it detects that the SOC value of the battery state of charge is greater than 80%, and the hybrid vehicle adopts pure electric drive mode. Running, the second state, detecting that the SOC value of the state of charge of the battery is less than 80%, the hybrid vehicle adopts the hybrid mode of cruising in which the engine and the drive motor work simultaneously; the third state, detecting that the SOC value of the state of charge of the battery is less than 30%, and the hybrid The power vehicle adopts the engine driving mode to cruise;

When the hybrid electric vehicle is in the state of braking energy recovery and power generation, the main control circuit receives the braking signal, sends a signal to the engine ECU to stop fuel injection and ignition, shuts down the drive circuit, and protects the drive circuit and inverter circuit, and at the same time generates power to the drive The conversion circuit sends out a braking pulse signal to convert the driving motor into a generator, and the electric energy output by the generator is stabilized by the voltage stabilizing circuit and then stored in the battery, so as to achieve the purpose of recovering the braking energy of the hybrid electric vehicle for power generation.

Compared with the prior art, the electric control method of the present invention divides the working state of the hybrid electric vehicle into starting state, acceleration state, cruising state and braking energy recovery power generation state, and the operating mode during cruising Further refinement has been carried out to make the power and fuel economy of hybrid vehicles closer to the performance of the optimal state under actual working conditions, thereby improving the power and fuel economy of hybrid vehicles, and having braking energy recovery function, significantly improving the cruising range.

Description of drawings

Fig. 1 is a flow chart of the electronic control method of the embodiment of the present invention.

In the figure: 1. Main control circuit 2. Drive circuit 3. Inverter circuit 4. Engine ECU 5. Engine 6. Hybrid electric vehicle 7. Drive generation conversion circuit 8. Drive motor 9. Regulator circuit 10. Battery.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing:

The electronic control method of a hybrid electric vehicle, the main control circuit 1 coordinates and controls the driving circuit 2, the drive generation conversion circuit 7 and the engine ECU 4, so that the hybrid electric vehicle can work in different states, and it is characterized in that: the working states of the hybrid electric vehicle 6 are divided into: Starting state, acceleration state, cruising state and braking energy recovery power generation state;

When the hybrid electric vehicle 6 is in the starting state, it is driven in pure electric mode. The main control circuit 1 receives the starting signal from the driver, and the main control circuit 1 automatically turns off the driving power generation conversion circuit 7, and controls the driving power generation conversion circuit 7 and the voltage regulator. The circuit 9 is protected, the main control circuit 1 confirms the voltage of the battery 10 required for starting, and at the same time calculates the pulse signal required for starting, and then transmits it to the driving circuit 2, and the driving circuit 2 amplifies the power of the driving pulse signal and sends it to the inverter The circuit 3, the inverter circuit 3 controls the current on and off and converts the direct current of the battery 10 into a three-phase alternating current and sends it to the driving motor 8, so that the hybrid electric vehicle 6 starts running;

When the hybrid electric vehicle 6 is accelerating, the main control circuit 1 receives the acceleration signal from the driver and detects the power signal of the drive motor 8. When the actual power of the drive motor 8 does not reach 80% of the rated power, the main control circuit 1 The circuit 1 calculates the acceleration pulse signal that the drive motor 8 should provide according to the acceleration signal, and transmits it to the drive motor 8 through the drive circuit 2 and the inverter circuit 3. When the power reaches more than 80% of the rated power, the main control circuit 1 receives the acceleration signal from the driver, calculates the fuel injection ignition signal when the engine 5 is running at the highest efficiency, and the main control circuit 1 transmits the fuel injection ignition signal to the engine ECU4, engine ECU4 controls the engine 5 to run at the highest efficiency, and at the same time, the main control circuit 1 calculates the acceleration pulse signal that the drive motor 8 should provide power to meet the acceleration requirements according to the acceleration signal, and the main control circuit 1 transmits the acceleration pulse signal to the driver Circuit 2, the drive circuit 2 amplifies the power of the acceleration pulse signal and inputs it to the inverter circuit 3, the inverter circuit 3 controls the current on and off and converts the direct current of the battery into a three-phase alternating current and sends it to the drive motor 8. At this time, the hybrid electric vehicle 6. Accelerating operation in a hybrid power mode in which the engine 5 and the drive motor 8 work simultaneously;

When the hybrid electric vehicle 6 is cruising, the main control circuit 1 first receives the vehicle speed signal and confirms the vehicle speed. In the first state, when the vehicle speed is less than 80 km/h, the SOC value of the state of charge of the battery 10 is detected to be greater than 80%, and the hybrid electric vehicle 6 uses Pure electric driving mode operation, the second state, detection battery 10 state of charge SOC value is less than 80%, hybrid electric vehicle 6 uses the hybrid power mode cruising driving of engine 5 and driving motor 8 to work simultaneously, the third state, detection battery 10 charge state The SOC value of the electric state is less than 30%, and the hybrid electric vehicle 6 adopts the engine driving mode to cruise;

When the hybrid electric vehicle 6 is in the state of braking energy recovery and power generation, the main control circuit 1 receives the braking signal, sends a signal to the engine ECU4 to stop fuel injection and ignition, closes the driving circuit 2, and protects the driving circuit 2 and the inverter circuit 3 At the same time, a braking pulse signal is sent to the drive generation conversion circuit 7, so that the drive motor 8 is converted into a generator to run, and the electric energy output by the generator is stabilized by the voltage stabilizing circuit 9 and then stored in the storage battery 10 to achieve braking of the hybrid electric vehicle 6. The purpose of energy recovery to generate electricity.

Claims (1)

1. a hybrid vehicle electric-control method, governor circuit (1) cooperation control driving circuit (2), driving generating change-over circuit (7) and Engine ECU (4), hybrid vehicle is worked under different conditions, it is characterized in that: the mode of operation of hybrid vehicle (6) is divided into: starting state, acceleration mode, cruising condition and Brake energy recovery generating state;

Hybrid vehicle (6) is when the state of starting, pure power mode is adopted to drive, governor circuit (1) receives the starting signal sent from chaufeur, governor circuit (1) is automatically closed and is driven generating change-over circuit (7), and driving generating change-over circuit (7) and mu balanced circuit (9) are protected, governor circuit (1) confirms the voltage of the required storage battery (10) of starting, calculate the impulse singla needed for starting simultaneously, then driving circuit (2) is sent to, drive pulse signal is carried out power gain and is transported to inverter circuit (3) by driving circuit (2), inverter circuit (3) controls current switching and the direct current (DC) of storage battery (10) is converted to three plase alternating current to flow to drive motor (8), thus make hybrid vehicle (6) driveaway operation,

Hybrid vehicle (6) is when giving it the gun, governor circuit (1) receives the Acceleration Signal that sends from chaufeur and detects the power signal of drive motor (8), when the effect horse power of drive motor (8) does not reach 80% of rating horsepower, now governor circuit (1) calculates according to Acceleration Signal the acceleration pulse signal that drive motor (8) should provide, through overdrive circuit (2), inverter circuit (3) sends drive motor (8) to, hybrid vehicle (6) adopts pure electric drive mode Accelerating running, when the power detecting drive motor (8) reaches more than 80% of rating horsepower, governor circuit (1) receives the Acceleration Signal sent from chaufeur, calculate the oil spout ignition signal during running of driving engine (5) peak efficiency, governor circuit (1) sends Engine ECU (4) to oil spout ignition signal, Engine ECU (4) controls driving engine (5) and operates with peak efficiency, simultaneously governor circuit (1) calculates according to Acceleration Signal the acceleration pulse signal that the drive motor (8) meeting acceleration request also needs should provide power, governor circuit (1) sends driving circuit (2) to acceleration pulse signal, driving circuit (2) will speed up impulse singla to carry out power gain and is input to inverter circuit (3), inverter circuit (3) controls current switching and the direct current (DC) of storage battery is converted to three plase alternating current to flow to drive motor (8), at this moment hybrid vehicle (6) adopts the hybrid mode Accelerating running that driving engine (5) and drive motor (8) work simultaneously,

Hybrid vehicle (6) is when cruising traveling, governor circuit (1) first receives vehicle speed signal and confirms the speed of a motor vehicle, first state, when the speed of a motor vehicle is less than 80km/h, detect storage battery (10) state-of-charge SOC value and be greater than 80%, hybrid vehicle (6) adopts pure electric drive mode to run, second state, detect storage battery (10) state-of-charge SOC value and be less than 80%, hybrid vehicle (6) adopts driving engine (5) and the hybrid mode that simultaneously works of drive motor (8) to cruise traveling, the third state, detect storage battery (10) state-of-charge SOC value and be less than 30%, hybrid vehicle (6) adopts engine drive mode to cruise traveling,

Hybrid vehicle (6) is when Brake energy recovery generating state, governor circuit (1) receives speed-slackening signal, send to Engine ECU (4) and stop oil spout ignition signal, close driving circuit (2), and driving circuit (2) and inverter circuit (3) are protected, send brake pulse signal to driving generating change-over circuit (7) simultaneously, drive motor (8) is made to be converted to generator operation, the electric energy that electrical generator exports is after mu balanced circuit (9) is stable, be stored in storage battery (10), reach the object of hybrid vehicle (6) Brake energy recovery generating.