Hybrid electric bus engine starting method

Abstract

The invention discloses a hybrid electric bus engine starting method. A hybrid electric bus comprises an engine, a clutch mechanism, an electric motor and a transmission; the engine, the clutch mechanism, the electric motor and the transmission are arranged in sequence; the engine and the electric motor are dynamically coupled with each other and mutually provide power needed by bus running; an output shaft of the electric motor is connected with the input end of the transmission; the transmission is connected with a rear axle of the hybrid electric bus; when the hybrid electric bus is started, the hybrid electric bus is driven by the electric motor to run; after a vehicle speed reaches a certain value, the engine is started to drive the hybrid electric bus to run; the engine is started after being towed to an idling speed by the electric motor; and the engine is slowly driven to run to the idling speed while the bus is driven by the electric motor. No influence on the power of the buscan be guaranteed, and an effect of economically starting the engine can also be achieved.

Description

technical field [0001] The invention relates to a control method for a hybrid electric passenger car, in particular to a control method for a hybrid electric passenger car when the engine is started. Background technique [0002] At present, as the main force of new energy vehicles, hybrid vehicles have been widely used in new energy vehicles, especially in the field of buses. The drive mode of hybrid buses can greatly reduce the fuel consumption of buses that need to start and stop frequently. consumption and emissions, and hybrid electric buses are less affected by the battery, and the motor electronic control technology is relatively mature, and its cost is not much higher than that of traditional fuel buses, but it is much lower than that of pure electric buses. Therefore, hybrid electric buses It is more suitable for bus use at present. [0003] Most of the existing hybrid electric buses can realize pure electric drive, that is, the electric motor alone drives the vehi...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing hybrid electric buses can realize pure electric drive, that is, the electric motor alone drives the vehicle, and the engine does not run to provide power. This working mode will appear at the start-up stage of the vehicle, which can not only greatly reduce the emission when the vehicle starts, but also reduce the fuel consumption when the engine starts. ) basically adjusts the transmission to neutral, and after the motor stops, it is connected to the engine through a power coupling device (such as a clutch, etc.), and the motor drives the engine to idle speed and then starts the engine. After connecting with the engine, the engine can be driven to rotate, and in the process of the motor driving the engine, the transmission is in the neutral position, the whole vehicle has no power supply, and there will be power interruption, resulting in obvious frustration of the vehicle, affecting the power and comfort of the vehicle sex

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