Hybrid vehicle control method and control device

Abstract

The invention discloses a method for controlling a hybrid electric vehicle. The method comprises following steps of starting a heating device for pre-heating an engine on the premise that a key switch is in the on position and the pre-heating condition of the engine is satisfied; starting a driving motor and controlling the driving motor to rotate at the first rotation speed less than oil-injection rotation speed of the engine such that the driving motor reversely drags the engine to rotate at low speed; and increasing rotation speed of the driving motor in order to drive the engine to be in oil-injection state on the premise that the pre-heating end condition is satisfied and the key switch is in the starting position such that the engine is started. Based on the method for controlling the hybrid electric vehicle disclosed by the invention, combustion oil in an air cylinder can be completely burned when the engine is started so that oil saving rate of the overall vehicle is increased and exhaust gas emission is reduced. Additionally, the method helps to avoid incapability of starting the engine at the low-temperature environment and over-discharging of a storage battery. The invention further discloses a device for controlling the hybrid electric vehicle.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicles, and in particular relates to a control method and a control device of a hybrid electric vehicle. Background technique [0002] A hybrid vehicle is a vehicle that has at least two sources of power. figure 1 Shows a power system of a hybrid electric vehicle, including: engine 1, starter motor 2, drive motor 3, motor controller 4, super capacitor 5, battery 6, heating device 7, air filter 8, supercharger 9. Intercooler 10, clutch 11 and preheating relay 12, figure 1 The arrows in indicate the direction of air flow. [0003] When the ambient temperature is low, the start-up process of the hybrid vehicle is as follows: When the operator puts the key switch in the ON position (ON), the vehicle controller controls the battery 6 to supply power to the heating device 7, which flows through the air filter 8. The air in the supercharger 9 and the intercooler 10 is heated by the heating d...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a control method and control device for a hybrid electric vehicle, which can alleviate the problem of incomplete fuel combustion during engine start-up on the one hand, and can reduce the engine failure to start when the ambient temperature is too low on the other hand. probability, and the probability of the battery being over-discharged

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