Power switching control method and system of automobile

Abstract

The invention relates to the technical field of automobiles, in particular to a power switching control method of an extended-range automobile. The power switching control method comprises the steps that a required power of a range extender of the automobile is obtained; a target rotational speed and a target torque corresponding to the required power are obtained; an adjusting torque corresponding to the target rotational speed is calculated according to the target rotational speed; the torque of a generator is adjusted according to the adjusting torque, so that the generator can drag an engine to reach the target rotational speed; and the torque of the generator and the engine is adjusted according to the target torque, so that the generator and the engine reach the target torque. According to the power switching control method of the extended-range automobile, when the target power is switched, the switching path that target rotational speed adjustment is carried out first and thentarget torque adjustment is carried out is adopted, the problem of rotational speed overshoot in the switching process is optimized, the torque impact and work noise are reduced, the service life of the range extender is prolonged, and at the same time, the hardware cost and mechanical complexity are not increased.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a power switching control method and system for an extended-range automobile. Background technique [0002] Extended-range electric vehicles have become the best choice for the transition to pure electric vehicles due to their performance advantages of less fuel, low emissions, and long driving range, and have broad market prospects. Among them, the range extender system is a key component of the range-extended electric vehicle, which consists of an engine, a generator and its inverter. [0003] When the power battery is fully charged, the range extender is turned off, and the vehicle is in pure electric working mode. When the power of the power battery is insufficient, the range extender is turned on, and the range extender is switched to the target power demand, which is used to assist in driving the vehicle, and the vehicle enters the range extender mode. When switching ...

AI Technical Summary

Problems solved by technology

When switching between different operating points of the target power requirements of the range extender, since the engine is a mechanical energy conversion device with a large inertia, it has a large mechanical inertia and hysteresis characteristics; while the generator has a very small inertia and responds very quickly to the outside world. Fast, which makes the coupling coordination between the generator and the engine more difficult, and it is easy to cause speed overshoot when switching the operating point of the range extender, torque shock and increased operating noise

[0004] At present, in order to solve the problems of speed overshoot, torque shock and increased operating noise that are easy to occur when the operating point of the programmer is switched, one method is to add a clutch device between the engine and the generator, but this will increase the cost of hardware and machinery and complexity, also increases the complexity of software control

Another method is to optimize the engine speed closed-loop control accuracy and response time, but due to the large mechanical inertia and hysteresis characteristics of the engine, it still cannot fundamentally solve the problem

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