Control system and control method of range-extending engine of range-extender electric vehicle

Abstract

The application aims to provide a control method of a control system of a range extending engine of a range extending electric vehicle, which can directly use an existing engine controller, thereby avoiding increasing the development cycle and cost of the range extending electric vehicle due to modification of the engine controller. The control system of the range extending engine of the range extending electric vehicle comprises an electric pedal for controlling a driving motor, a range extending engine, an engine controller for controlling the range extending engine, a vehicle controller and a throttle pedal simulation controller, the vehicle controller is connected with the electric pedal and the throttle pedal simulation controller respectively, the throttle pedal simulation controller is connected with the engine controller, and the engine controller is connected with the range extending engine. The application solves the problem that the electric pedal and the throttle pedal signal of a traditional vehicle are inconsistent in the range extending electric vehicle, and the traditional engine controller and the vehicle controller can be used in the range extending electric vehicle, thereby having good practicability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of new energy vehicles, and particularly relates to a control system and a control method of a range extending engine of a range extending electric vehicle. BACKGROUND

[0002] The range extending electric vehicle is a new energy vehicle, which is driven by an electric motor and is equipped with a range extending engine and a generator. When the battery has sufficient power, the battery drives the electric motor to provide the driving power demand of the vehicle, and the range extending engine does not work at this time. When the power of the battery is consumed to a certain extent, the range extending engine starts, and the range extending engine drives the generator to rotate, thereby charging the battery. When the battery has sufficient power, the range extending engine stops working, and the battery drives the electric motor to provide the driving of the vehicle. The range extending electric vehicle can make up for the lack of endurance of the pure electric vehicle, and is more economical than the fuel vehicle, so it is a good new energy vehicle.

[0003] Since the electric pedal of the range extending electric vehicle does not directly control the working of the range extending engine, but the vehicle controller directly controls the starting and speed of the range extending engine according to the working condition and demand, the existing engine cannot be directly applied to the range extending electric vehicle for the traditional vehicle manufacturer, and the control strategy of the range extending engine needs to be developed again, which has the problems of long development cycle and high cost. SUMMARY

[0004] The purpose of the application is to provide a control system and a control method of a range extending engine of a range extending electric vehicle, which can directly use the existing engine controller, thereby avoiding increasing the development cycle and cost of the range extending electric vehicle due to the modification of the engine controller.

[0005] The control system of the range extending engine of the range extending electric vehicle comprises an electric pedal for controlling the driving electric motor, a range extending engine, an engine controller for controlling the range extending engine, a vehicle controller and a throttle pedal simulation controller. The vehicle controller is connected with the electric pedal and the throttle pedal simulation controller respectively. The throttle pedal simulation controller is connected with the engine controller. The engine controller is connected with the range extending engine.

[0006] Specifically, the throttle pedal simulation controller is connected with the engine controller through a power supply line, a start-stop signal line and a throttle pedal simulation signal line, so as to generate corresponding instruction information and supply power to the engine controller.

[0007] Further, the throttle pedal simulation controller is also connected with the engine controller through a signal feedback line, so that the engine controller and the throttle pedal simulation controller can communicate and feed back the current state to the throttle pedal simulation controller.

[0008] Further, for the convenience of wiring and the reduction of the number of hard wires, the vehicle controller is connected with the accelerator pedal through a hard wire, and the vehicle controller is connected with the accelerator pedal simulation controller through a CAN bus.

[0009] The control method of the extended-range engine of the extended-range electric vehicle of the application applies the control system of the extended-range engine of the extended-range electric vehicle as described above, and the specific steps are as follows: the accelerator pedal sends an accelerator opening degree signal to the vehicle controller, the vehicle controller sends the accelerator opening degree signal to the driving motor to control the driving motor to work, and at the same time, the vehicle controller obtains an accelerator pedal simulation opening degree signal and an extended-range engine start-stop signal according to the accelerator opening degree signal and current vehicle condition information, and sends the accelerator pedal simulation opening degree signal and the extended-range engine start-stop signal to the accelerator pedal simulation controller; the accelerator pedal simulation controller controls the power supply of the engine controller to be turned on or off according to the accelerator pedal simulation opening degree signal and the extended-range engine start-stop signal, and sends an extended-range engine start-stop instruction and an accelerator pedal opening degree signal to the engine controller; after the engine controller is powered on, the engine controller controls the work of the extended-range engine according to the extended-range engine start-stop instruction and the accelerator pedal opening degree signal.

[0010] Specifically, the current vehicle condition information includes the current high-voltage battery power, the driver's required driving power, the current vehicle speed, the efficiency MAP of the extended-range engine and the efficiency MAP of the generator. The control strategy of the extended-range engine may be different for each automobile manufacturer, which is not described here.

[0011] Further, the accelerator pedal opening degree signal is an analog signal obtained by digital-to-analog conversion of the accelerator pedal simulation opening degree signal by the accelerator pedal simulation controller, to simulate the analog signal transmitted to the engine controller by the traditional accelerator pedal.

[0012] The application solves the problem that the electric pedal in the extended-range electric vehicle is inconsistent with the traditional automobile accelerator pedal signal, and the traditional engine controller and the vehicle controller can be used in the extended-range electric vehicle, which has good practicability. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the system principle diagram of the control system of the extended-range engine of the extended-range electric vehicle of the application. DETAILED DESCRIPTION

[0014] The shape, structure, mutual position and connection relationship between parts, the function and working principle of each part and the like of the specific embodiments of the application involved will be further described in detail below by comparing with the drawings and describing the embodiments.

[0015] Embodiment 1:

[0016] This embodiment proposes a control system and control method for the range-extending engine of a range-extending electric vehicle, which can directly utilize the existing engine controller, thereby avoiding the increase in development cycle and cost of range-extending electric vehicles due to modifications to the engine controller.

[0017] like Figure 1 As shown, the control system of the range-extending engine of the range-extending electric vehicle in this embodiment includes an accelerator pedal for controlling the drive motor, a range-extending engine, an engine controller for controlling the range-extending engine, a vehicle controller, and an accelerator pedal simulation controller. The vehicle controller is connected to the accelerator pedal via a hardwired connection and is also connected to the accelerator pedal simulation controller via a CAN bus. The accelerator pedal simulation controller is connected to the engine controller via a power supply line, a start / stop signal line, an accelerator pedal simulation signal line, and a CAN bus. The engine controller is connected to the range-extending engine.

[0018] The power supply line is used to supply power from the accelerator pedal simulation controller to the engine controller; the start / stop signal line is used for the accelerator pedal simulation controller to send engine start / stop signals to the engine controller; the accelerator pedal simulation signal line is used for the accelerator pedal simulation controller to send throttle opening signals to the engine controller; the CAN bus between the accelerator pedal simulation controller and the engine controller is used for signal feedback from the engine controller, enabling communication between the engine controller and the accelerator pedal simulation controller, and providing feedback on the current status to the accelerator pedal simulation controller.

[0019] The control method for the range extender engine of this embodiment of the range extender electric vehicle applies the control system for the range extender engine of the aforementioned range extender electric vehicle. The specific steps are as follows: The accelerator pedal sends an accelerator opening signal to the vehicle controller. While sending the accelerator opening signal to the drive motor to control its operation, the vehicle controller also derives a simulated accelerator pedal opening signal and a range extender engine start / stop signal based on the accelerator opening signal and current vehicle status information. These signals are then sent to the accelerator pedal simulation controller. The accelerator pedal simulation controller, based on the simulated accelerator pedal opening signal and the range extender engine start / stop signal, determines the accelerator pedal opening signal and the range extender engine start / stop signal. The start / stop signal controls the power supply to the engine controller and sends start / stop commands for the range extender engine and throttle pedal opening signals to the engine controller. The throttle pedal opening signal is an analog signal obtained by the throttle pedal analog controller through digital-to-analog conversion based on the analog throttle pedal opening signal, to simulate the analog signal transmitted to the engine controller by the traditional throttle pedal. This analog signal is a continuous analog signal with an output resolution of 0.01V and 4-channel DAC with the same direction tolerance, ranging from 0 to 5V. After the engine controller is powered on, it controls the operation of the range extender engine according to the start / stop commands for the range extender engine and the throttle pedal opening signals.

[0020] Specifically, the current vehicle status information includes the current high-voltage battery charge, the driver's required driving power, the current vehicle speed, the range extender engine's efficiency MAP, and the generator's efficiency MAP. Each automaker may have different control strategies for the range extender engine, which will not be elaborated upon here.

[0021] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific design of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A control method of a control system of a range extending engine of a range extending electric vehicle, characterized by, The control system of the extended-range engine comprises an electric-pedal pedal for controlling the driving motor, the extended-range engine, an engine controller for controlling the extended-range engine, a vehicle controller and a throttle-pedal simulation controller, the vehicle controller being connected with the electric-pedal pedal and the throttle-pedal simulation controller respectively, the throttle-pedal simulation controller being connected with the engine controller, and the engine controller being connected with the extended-range engine; the throttle-pedal simulation controller is connected with the engine controller through a power supply line, a start-stop signal line and a throttle-pedal simulation signal line; the electric-pedal pedal sends an electric-pedal opening degree signal to the vehicle controller, the vehicle controller sends the electric-pedal opening degree signal to the driving motor to control the driving motor, and the vehicle controller also obtains a throttle-pedal simulation opening degree signal and an extended-range engine start-stop signal according to the electric-pedal opening degree signal and current vehicle condition information, and sends the throttle-pedal simulation opening degree signal and the extended-range engine start-stop signal to the throttle-pedal simulation controller; the throttle-pedal simulation controller controls the power supply of the engine controller to be on or off according to the throttle-pedal simulation opening degree signal and the extended-range engine start-stop signal, and sends an extended-range engine start-stop instruction and a throttle-pedal opening degree signal to the engine controller; The engine controller controls the operation of the extended-range engine according to the extended-range engine start-stop instruction and the throttle-pedal opening degree signal after being powered on.

2. The control method of the control system of the range extending engine of the range extending electric vehicle according to claim 1, characterized by, The throttle-pedal simulation controller is also connected with the engine controller through a signal feedback line.

3. The control method of the control system of the range extended engine of the range extended electric vehicle according to claim 1, characterized by, The vehicle controller is connected with the electric-pedal pedal through a hard line, and the vehicle controller is connected with the throttle-pedal simulation controller through a CAN bus.

4. The control method of the control system of the range extended engine of the range extended electric vehicle according to claim 1, characterized by, The current vehicle condition information comprises the current high-voltage battery capacity, the driver's required driving power, the current vehicle speed, the efficiency MAP of the extended-range engine and the efficiency MAP of the generator.

5. The control method of the control system of the range extended engine of the range extended electric vehicle according to claim 1, characterized by, The throttle-pedal opening degree signal is an analog signal obtained by digital-to-analog conversion of the throttle-pedal simulation opening degree signal by the throttle-pedal simulation controller.

Images