CN-120663898-B - Range extender control method and system for range extender commercial vehicle

CN120663898BCN 120663898 BCN120663898 BCN 120663898BCN-120663898-B

Abstract

The invention relates to a range extender control method and a range extender control system for a range extender commercial vehicle, wherein the range extender control method comprises the steps that a vehicle controller continuously collects vehicle operation parameters including a loading state, a vehicle speed, an accelerator opening, a power battery, a range extender operation state and state maintenance time, a full-load mode or an empty-load mode is switched according to the loading state, when the power battery does not reach a forced start-stop threshold, the range extender is controlled to execute corresponding instructions of stopping, operating in a first power generation economic point interval, operating in a second power generation economic point interval or operating in a third power generation economic point interval according to the relation between the vehicle speed and a first vehicle speed limit value, a second vehicle speed limit value and the relation between the accelerator opening and a first accelerator opening limit value, a second accelerator opening limit value and a third accelerator opening limit value, and the system effectively controls an engine and a generator by reasonably adjusting the range extender economic power interval and combining the start-stop control of the engine.

Inventors

ZHANG LE
GUO YAO
HU YELIANG
YU ZHIPING
GUO XU
WANG MING
ZHANG DI
JIANG LI
MENG HAOJIE
ZHU YANBIN

Assignees

南京航智电动科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250620

Claims (8)

1. The control method of the range extender of the range-extending commercial vehicle is characterized by comprising the following steps of: S1, continuously acquiring vehicle operation parameters including a load state, a vehicle speed, an accelerator opening degree, a power battery SOC, a range extender operation state and a state maintenance time by a vehicle controller; s2, switching a full-load mode or an empty-load mode according to the load state; S3, when the SOC of the power battery does not reach the forced start-stop threshold value: if the vehicle speed is less than the first vehicle speed limit value and the accelerator opening is less than the first accelerator opening limit value, and the first preset time is maintained, controlling the range extender to stop; If the vehicle speed epsilon [ first vehicle speed limit value, second vehicle speed limit value) and the accelerator opening epsilon [ first accelerator opening limit value, second accelerator opening limit value ] are maintained for a second preset time, controlling the range extender to operate in a first power generation economic point interval; If the vehicle speed epsilon [ second vehicle speed limit value, third vehicle speed limit value) and the accelerator opening epsilon [ second accelerator opening limit value, third accelerator opening limit value) and maintaining the third preset time, controlling the range extender to operate in a second power generation economic point interval; if the vehicle speed is greater than or equal to a third vehicle speed limit value, the accelerator opening is greater than or equal to a third accelerator opening limit value, and the fourth preset time is maintained, controlling the range extender to operate in a third power generation economic point interval; The power generation economic point interval is a high-efficiency operation interval defined based on an external characteristic curve of the engine.
2. The method for controlling a range extender of a range-extending commercial vehicle according to claim 1, wherein in the full-load mode: the first vehicle speed limit value is 10km/h, the first accelerator opening limit value is 15%, and the first preset time is 5 seconds; The second speed limit value is 30km/h, the second accelerator opening limit value is 40%, and the second preset time is 10 seconds; the third vehicle speed limit value is 60km/h, the third accelerator opening limit value is 70%, and the fourth preset time is 5 seconds.
3. The method for controlling a range extender of a range-extending commercial vehicle according to claim 1, wherein in the no-load mode: the first vehicle speed limit value is 8km/h, the first accelerator opening limit value is 12%, and the first preset time is 5 seconds; The second speed limit value is 25km/h, the second accelerator opening limit value is 35%, and the second preset time is 10 seconds; The third speed limit value is 55km/h, the third accelerator opening limit value is 65%, and the fourth preset time is 5 seconds.
4. A range extender control method for a range-extending commercial vehicle according to any one of claims 1 to 3, characterized in that: The power generation economic point interval is determined by: the first power generation economic point interval corresponds to a low-speed driving working condition, and the fuel consumption rate is reduced by more than or equal to 12 percent; The second power generation economic point interval corresponds to a medium-speed driving working condition, and the fuel consumption rate is reduced by more than or equal to 15 percent; The third power generation economic point interval corresponds to a high-speed driving working condition, and the fuel consumption rate is reduced by more than or equal to 18 percent.
5. A control system based on the range extender control method for a range extender commercial vehicle according to any one of claims 1 to 4, comprising: the whole vehicle controller is connected with each control unit through a CAN bus and is used for collecting vehicle parameters in real time and generating a range extender control instruction; the engine control unit is used for receiving the command of the whole vehicle controller and adjusting the start and stop of the engine and the rotating speed to match the target power generation economic point interval; The generator controller regulates and controls the output electric energy of the generator and adapts to the power supply requirement of a battery charging or driving system; the battery management system monitors the power battery and feeds back the power battery to the whole vehicle controller; the throttle sensor is used for collecting throttle opening signals in real time and transmitting the throttle opening signals to the whole vehicle controller; and the load identification module is used for identifying the load state of the vehicle and uploading the load state to the whole vehicle controller.
6. The range extender control system for a range-extending commercial vehicle of claim 5, wherein: The whole vehicle controller is also connected with the driving motor controller and the gearbox controller, and seamless switching between power supply of the range extender and pure electric drive is realized by cooperatively controlling torque of the driving motor and gear of the gearbox.
7. The range extender control system of claim 5 further comprising: The driving motor converts the electric energy into mechanical energy to drive the vehicle; a high-voltage connection line for transmitting the electric energy output from the generator to the battery system or the driving motor controller; And a mechanical connection part for transmitting the engine power to the generator.
8. The range extender control system for a range-extending commercial vehicle of claim 5, wherein: the whole vehicle controller can forcedly start the range extender under the condition that the SOC of the power battery is lower than the lowest threshold value or forcedly stop under the condition that the SOC of the power battery is higher than the highest threshold value.

Description

Range extender control method and system for range extender commercial vehicle Technical Field The invention belongs to the technical field of range extender control, and particularly relates to a range extender control method and a range extender control system for a range extender commercial vehicle. Background With the deepening of global energy conservation and emission reduction policies and the popularization of new energy technologies, the field of commercial vehicles is accelerating to change to electric. Compared with the traditional fuel commercial vehicle, the pure electric commercial vehicle has the advantages of zero emission, low noise, low use cost and the like, but is limited by factors such as battery energy density, charging infrastructure coverage rate, charging time and the like, and the endurance mileage and the operation efficiency of the pure electric commercial vehicle still face significant challenges in scenes such as long-distance transportation, heavy-load operation and the like. The range-extending technology can charge a battery or directly supply power to a driving motor on the premise of not directly driving a vehicle by integrating an engine and a generator system, so that a cruising short plate of a pure electric vehicle is effectively made up, and the range-extending technology becomes one of important transition schemes of the electric of a commercial vehicle. The core of the range extender commercial vehicle is the efficient control of the range extender, and the control strategy directly influences the fuel economy, emission performance, power smoothness and system reliability of the vehicle. The traditional range extender control strategy mostly adopts a fixed threshold start-stop mode (for example, the range extender is forcedly started or stopped when the battery power is lower than or higher than a specific value), and the real-time working condition of the vehicle is not fully combined, so that the range extender is frequently started and stopped or works in a low-efficiency interval for a long time, the fuel is wasted and discharged to exceed the standard, and the energy management efficiency is insufficient. Disclosure of Invention This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application. In view of the technical problems in the prior art, the method is used for solving the problems of low system operation efficiency and the like caused by the existing range extender fixed threshold power generation control mode. In order to solve the technical problems, the invention provides a range extender control method for a range extender commercial vehicle, which comprises the following steps: S1, continuously acquiring vehicle operation parameters including a load state, a vehicle speed, an accelerator opening degree, a power battery SOC, a range extender operation state and a state maintenance time by a vehicle controller; s2, switching a full-load mode or an empty-load mode according to the load state; S3, when the SOC of the power battery does not reach the forced start-stop threshold value: if the vehicle speed is less than the first vehicle speed limit value and the accelerator opening is less than the first accelerator opening limit value, and the first preset time is maintained, controlling the range extender to stop; If the vehicle speed epsilon [ first vehicle speed limit value, second vehicle speed limit value) and the accelerator opening epsilon [ first accelerator opening limit value, second accelerator opening limit value ] are maintained for a second preset time, controlling the range extender to operate in a first power generation economic point interval; If the vehicle speed epsilon [ second vehicle speed limit value, third vehicle speed limit value) and the accelerator opening epsilon [ second accelerator opening limit value, third accelerator opening limit value) and maintaining the third preset time, controlling the range extender to operate in a second power generation economic point interval; if the vehicle speed is greater than or equal to a third vehicle speed limit value, the accelerator opening is greater than or equal to a third accelerator opening limit value, and the fourth preset time is maintained, controlling the range extender to operate in a third power generation economic point interval; The power generation economic point interval is a high-efficiency operation interval defined based on an external characteristic curve of the engine. As a preferable technical scheme of the range extender control method of the range extender type commercial vehicle, the full-load mode is as follows: the first vehicle speed limit value is 10km/h, the first accelerator openi