A method of engine start control

Abstract

The invention discloses an engine start control method. The engine start control method comprises the steps that zero clearing is conducted on control commands of a motor and a clutch, and the motor and the clutch are in an uncontrolled mode; a clutch combination command is sent, and a position state of the clutch is monitored; when the position state of the clutch is combination, a control mode of the motor is set as torque control; a torque value changing curve of the torque control is a given curve which comprises a period of eliminating gaps and a period of rapidly increasing torsion. According to the engine start control method, the cooperation of the motor and a single clutch is used to drive an engine, due to the fact that the torsion of the torque value changing curve of the motor increases slowly in the period of eliminating the gaps, mechanical impact force generated by driving the torque among the driving parts in a dynamical system is reduced, and the service life of the parts can be prolonged. In addition, by means of the engine start control method, due to the fact that the engine can be driven to the default rotating speed as soon as possible in the period of rapidly increasing the torsion, the start efficiency of the engine is improved.

Description

technical field [0001] The invention relates to the field of parallel hybrid electric vehicles, in particular to an engine startup control method. Background technique [0002] In a parallel hybrid electric vehicle, the power system includes an engine and an electric motor, which provide kinetic energy through two power sources of fuel and electric power, and transmit mechanical energy through the coaxial connection between the engine and the electric motor. Generally, in the engine of a parallel hybrid electric vehicle, the fuel may include gasoline, diesel or natural gas. [0003] The parallel hybrid electric vehicle needs to start the engine frequently because of its CAN (Controller Area Network, Controller Area Network) start-stop function; The service life of the starter is shortened due to starting, and the success rate of starting the engine will gradually decrease as the number of starts of the starter increases. [0004] In the prior art, in order to reduce the nu...

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide an engine start control method to solve the problem in the prior art that it is impossible to optimize the number of starts of the starter for a parallel hybrid vehicle with a single clutch

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