Engine start-stop control method and system for power split type hybrid transmission

Abstract

The invention discloses an engine start-stop control method and system for a power split type hybrid transmission, and belongs to the technical field of power split type hybrid electric vehicles. The method is used for restraining impact caused by the start-stop process of the power split type hybrid power engine. The control system comprises a vehicle control unit HTCU, the engine control unit ECU is responsible for collecting a high-precision crankshaft position signal and a camshaft position signal and sending the signals to the generator controller MCU2 for shutdown angle control; the generator control unit MCU2 is responsible for dragging an engine to start and reversely dragging the engine to a specified crank angle through torque control; and the driving motor control unit MCU1 is responsible for responding to the vehicle control unit HTCU to perform torque preloading when the engine is started. The control system integrates the functions of driving motor torque advanced loading and engine stop angle control, and the impact feeling caused by the engine start and stop process is solved through the special control mode, so that the vehicle NVH is optimized, and the driving comfort and smoothness are improved.

Description

technical field [0001] The invention belongs to the technical field of power-split hybrid electric vehicles, and in particular relates to an engine start-stop control method and system based on a power-split hybrid special transmission. Background technique [0002] my country's energy and environmental situation is becoming more and more severe, emission regulations are constantly upgraded, and people's awareness of environmental protection is gradually strengthened, which will further promote the transformation of energy strategy. New energy vehicles represented by hybrid electric vehicles and pure electric vehicles will become an important direction for future automotive development. For a long time in the future, due to the high cost of power batteries, and there is still much room for improvement in technical capabilities such as energy density, cruising range, mass size, etc., hybrid technologies of various architectures will become an important transition route. Among...

AI Technical Summary

Problems solved by technology

Among them, the engine, motor and driving wheels are always coupled together through planetary gears, and the torque fluctuation of any input shaft will affect the wheel torque output and be transmitted to the body, resulting in deterioration of ride comfort

In particular, the impact caused by the engine start-stop process will be directly transmitted to the wheel end, affecting driving comfort

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