Single-motor hybrid power system engine start-stop management system and method

Abstract

The invention provides a single-motor hybrid power system engine start-stop management system and method, and belongs to the technical field of hybrid automobile energy management strategies. The problem of how to adapt to various working conditions to achieve optimization of engine start-stop management is solved. The system comprises an acquisition module, an SOC judgment module, a threshold value determination module, a torque judgment module and an execution module. The method comprises the following steps: determining whether the current SOC is greater than an SOC threshold value I or not, and if the current SOC is smaller than the set SOC threshold value I, determining whether the current SOC is in an ascending process or a descending process; determining a current engine start-stoprequired torque threshold value; and when the current required torque meets the current engine start-stop required torque threshold value, sending an engine start-stop control instruction. Start-stopdifferentiated control over the engine is conducted by distinguishing the ascending process and the descending process of the SOC, elimination of low-efficiency working points of the engine and low-speed frequent start-stop of the engine is facilitated, the running time of the engine in the low-SOC section is prolonged, and short-time efficient utilization of energy is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of hybrid vehicle energy management strategies, and relates to a system and method for engine start-stop management of a single-motor hybrid power system. Background technique [0002] The engine start-stop strategy is an important component of the energy management strategy, which is related to the output of engine energy and the control of idle fuel consumption. The current common engine start-stop strategy is a single rule to determine the required torque to start and stop the engine based on SOC and vehicle speed. Generally, it is set based on engine efficiency or system efficiency considerations. SOC is the charge of the power battery. That is, when the SOC is low, the required torque threshold for starting the engine is low, and the shutdown threshold is also close to 0, so that the engine can be started with a small throttle, and it is not easy to stop, increasing the working conditions of the engine ...

AI Technical Summary

Problems solved by technology

The system and method solve the problem of how to realize optimal engine start-stop management under various working conditions

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