A method for optimizing the engine operating point of a cross-connected hybrid vehicle

Abstract

The invention discloses an engine operating point optimizing method for a series-parallel hybrid vehicle, the method comprises the following steps: step 1, acquiring the engine speed parameter and themotor torque parameter; step 2, calculating the corresponding oil consumption of an engine and the power consumption of an ISG (Integrated Starter Generator) motor by changing the motor torque parameter under the condition that the engine speed parameter is not changed; step 3, calculating the corresponding oil consumption of each engine and the power consumption of the ISG motor by changing theengine speed parameter under the condition that the motor torque parameter is not changed; step 4, acquiring horizontal comparison data; step 5, acquiring vertical comparison data; and step 6, determining the optimal working point for the starting of the engine and the optimal charging working point of the engine at the series operation mode according to the horizontal comparison data obtained inthe step 4 and the vertical comparison data obtained in the step 5. The rule of the method is simple, the searching scope is comprehensive, the applicability is wide, and the engine operating point optimizing method is suitable for optimizing the energy management strategy of series-parallel, serial connection and the like.

Description

technical field [0001] The invention relates to the technical field of vehicle engines, in particular to an engine operating point optimization method of a series hybrid vehicle. Background technique [0002] The hybrid hybrid system has good power and fuel economy. It combines the advantages of series hybrid vehicles and parallel hybrid vehicles, and has been developed and popularized faster, especially in the field of buses. more extensive. At present, most domestic hybrid structures adopt single-axis or multi-axis hybrid systems, that is, the engine is connected to the ISG motor, and then connected to the drive motor and energy source through a clutch device. [0003] In the starting of the engine, different from the traditional starting method, the torque control of the ISG motor is used to drive the starting process of the engine. During the working process of hybrid vehicles, especially hybrid vehicles, in order to ensure fuel economy, the engine will start and stop ...

AI Technical Summary

Problems solved by technology

In the working process of hybrid vehicles, especially hybrid vehicles, in order to ensure fuel economy, the engine will start and stop frequently according to the energy management strategy, which will cause a certain degree of energy waste in the process

Similarly, in the area of ​​series work, due to the process from fuel oil to power generation, its working efficiency and the setting of power generation operating point will greatly affect the fuel economy of the whole process, so how to measure the quality of a series power generation operating point has also become a problem. an important question

[0004] At present, for the above two problems, most of the solutions are determined through the comparison method of working cycle and actual road test. This method is not only not accurate enough, but also consumes time and energy.

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