Hybrid electric vehicle and drive control method and device of hybrid electric vehicle

Abstract

The invention discloses a drive control method and device of a hybrid electric vehicle and the hybrid electric vehicle. The method includes the following steps that the current gear of the hybrid electric vehicle, the current electric quantity of a power battery and the slope of the road where the hybrid electric vehicle is located currently are obtained; according to the current gear of the hybrid electric vehicle, the current electric quantity of the power battery and the slope of the road where the hybrid electric vehicle is located currently, whether the hybrid electric vehicle is in a sliding start and stop vehicle speed interval or not is judged; if the hybrid electric vehicle is in the sliding start and stop interval, the current vehicle speed of the hybrid electric vehicle is further obtained; if the current vehicle speed is larger than or equal to a third vehicle speed threshold value and smaller than a fourth vehicle speed threshold value, the hybrid electric vehicle is controlled to achieve a small-load shutdown function; and if the current vehicle speed is larger than or equal to the fourth vehicle speed threshold value and smaller than the fifth vehicle speed threshold value, the hybrid electric vehicle is controlled to achieve a small-load flameout function. By the adoption of the drive control method of the hybrid electric vehicle of the embodiment, the recovered electric quantity can be increased, the running mileage of the whole vehicle is increased, the economic performance is improved, oil consumption is reduced, and the emission load is reduced.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a hybrid electric vehicle and a drive control method and device thereof. Background technique [0002] Most of the traditional fuel vehicles are equipped with an additional set of special automatic start-stop subsystems to realize the control of vehicle coasting start and stop, so as to reduce fuel waste and air pollution caused by engine idling. At present, the start-stop system in the car mainly has the following three forms. [0003] ① Separate starter / generator start-stop system: a common start-stop control system. The starter and generator of the system are independently designed, the power required for starting the engine is provided by the starter, and the generator provides electric energy for the starter. The system includes highly enhanced starter, enhanced battery (generally AGM battery), controllable generator, engine ECU (Electronic Control Unit, electronic contro...

AI Technical Summary

Problems solved by technology

[0006] The engine will start frequently when the vehicle is driving in congested conditions, which is a huge test for the spark plug and the battery. Although the above-mentioned start-stop control system is smart enough, it will wear the engine to a certain extent and shorten its service life. Vibration and noise are unavoidable and seriously reduce comfort

In addition, the automatic start-stop system is only in the stopped state when the vehicle speed is zero, the engine speed is lower than the specified target speed, the refrigerant is within the specified range, the brake vacuum meets the specified requirements, the air conditioning adjustment requirements are not too high, and it is in a specially designated gear. (such as N or P gear), step on the brake pedal, and the battery power meets the conditions of the next start, etc., the start-stop system will work, the engine will automatically turn off, the use conditions are limited, and there are many factors to consider, so that the system components are reliable. Durability requirements are high, and this subsystem also increases the cost of the vehicle

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