Novel dynamic switching method for speed of hybrid electric bus

Abstract

The invention discloses a hybrid electric vehicle control strategy, and relates to a novel dynamic switching method for the speed of a hybrid electric bus. The novel dynamic switching method mainly includes the steps: acquiring acceleration information of the bus; acquiring on-off information of an air conditioner of the bus; acquiring speed information of the bus; determining switching speed of the bus according to the three information parameters; and controlling an automatic clutch according to the switching speed of the bus. The novel dynamic switching method for the speed of the hybrid electric bus can be used for not only meeting the requirements of the clutch on connection and separation, but also meeting the requirements of the clutch on connection and separation after idle speed boost of an engine and the air conditioner, so that oil consumption of the bus can be reduced, smoothness of the bus is improved, and the service life of the clutch is prolonged.

Description

technical field [0001] The invention relates to a control strategy of a hybrid electric vehicle, in particular to a novel dynamic switching method of a hybrid electric vehicle speed. Background technique [0002] With the development of domestic new energy vehicles, various hybrid vehicles have emerged one after another, and their structural forms are mainly divided into series, parallel and hybrid. The most common hybrid structures such as figure 1 Shown: when driving at low speed, the automatic clutch disengages, the motor drives the vehicle, and the engine is used for power generation; when the vehicle runs at high speed, the automatic clutch engages, the engine drives the vehicle, and the motor assists. By controlling the engagement and disengagement of the automatic clutch, the vehicle can switch between the series mode and the parallel mode. The disengagement and engagement of the automatic clutch is determined by the vehicle speed, which is the switching speed. Gener...

AI Technical Summary

Problems solved by technology

Pull the engine speed below the idle speed by braking, the engine will increase fuel injection, increase the fuel consumption of the vehicle, and at the same time affect the life of the clutch

[0004] ②When the disengagement vehicle speed is the vehicle speed corresponding to the engine idle speed, the vehicle decelerates from the parallel mode to the series mode, and the clutch disengagement process will be relatively stable. When the automatic clutch is engaged, the engine is idling at this time, and the speed is lower than the speed corresponding to the engaged vehicle speed. The engine will become the resistance of the vehicle to accelerate, which will affect the power and smoothness of the vehicle, and will shorten the service life of the clutch.

[0005] ③When the vehicle's air conditioner is turned on, the idle speed of the engine will increase by dozens of revolutions, and the fixed switching speed does not match the idle speed of the engine

Images