Hill starting control method, system of double-model HEV (Hybrid Electric Vehicle) and HEV

Abstract

The invention provides a hill starting control method of a double-model HEV (Hybrid Electric Vehicle). The method comprises the steps of acquiring a demand torque of a vehicle; comparing a demand torque with a peak value output torque of a main drive motor; if the demand torque is less than or equal to the peak value output torque of the main drive motor, providing the demand torque by the main drive motor; if the demand torque is more than the peak value output torque of the main drive motor, attracting a clutch, and further judging whether the existing travel speed is less than the preset vehicle speed; if the existing vehicle speed is less than the preset vehicle speed, providing the demand torque by an auxiliary motor and the main drive motor; if the existing vehicle speed is greater than or equal to the preset vehicle speed, providing the demand torque by an engine, the auxiliary motor and the main drive motor. According to the hill starting control method of the double-model HEV provided by the invention, the stability of the vehicle can be ensured when the demand torque is larger (for example, the hill starting is carried out), and the power demand can be maximally met. The invention further provides a hill starting control system of the double-model HEV and an HEV.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a slope control method and system for a dual-mode hybrid electric vehicle and the hybrid electric vehicle. Background technique [0002] When the vehicle is on a slope, the required torque is relatively large, and improper operation may cause the slope to slide, which is one of the key technologies for vehicle safety control. For a dual-mode hybrid vehicle, its dual-mode hybrid structure is as follows: figure 2 As shown, the feature is that it is equipped with two motors and there is no transmission. On a large slope, only the main drive motor 4 cannot complete the slope up process, and the auxiliary motor 2 must be used to complete the starting process. The auxiliary motor 2 is directly connected to the crankshaft of the engine 1. Since there is no transmission, the engine 1 rotates at a lower speed than the idle speed at low speeds (the critical speed of cars and buses is ...

AI Technical Summary

Problems solved by technology

The auxiliary motor 2 is directly connected to the crankshaft of the engine 1. Since there is no transmission, the engine 1 rotates at a lower speed than the idle speed at low speeds (the critical speed of cars and buses is about 40 and 20 km / h), and cannot start, and the vehicle speed increases when the slope starts. The ignition and fuel injection of the medium engine is relatively special, which is easy to cause a sudden change in torque and affect the comfort of the vehicle

Images