Speed control method of hybrid electric vehicle

Abstract

The invention discloses a speed control method for a hybrid electric vehicle, and the method comprises the steps that a signal conversion module divides a target speed gear into five gears according to a target speed, the output power of a DC power supply is determined by employing a power distribution strategy, and a first speed controller obtains a first control signal by employing an automaticquick adjustment strategy; a second speed controller obtains a second control signal according to a speed deviation signal, a current controller obtains a third control signal by adopting a vector control strategy, a second comparator converts the sum of the first control signal and the third control signal into a speed instruction signal, and a PWM generator obtains a PWM wave with an adjustableduty ratio according to the speed instruction signal; the PWM wave drives an inverter to convert direct current input by a DC power supply into alternating current with adjustable amplitude frequency.According to the method, speed control of a hybrid electric vehicle can be achieved, the hybrid electric vehicle is driven to rapidly run at the target speed, and the advantages of high response speed and low energy consumption are achieved.

Description

Technical field[0001]The present invention relates to the field of hybrid vehicle velocity control, and more particularly to a speed control method of hybrid vehicle.Background technique[0002]At present, the global energy and environmental issues have gradually prominent, and all countries in the world are actively seeking solutions, especially in new energy vehicles. The hydrogen fuel cell-lithium battery hybrid vehicle is a zero emissions, zero-polluted transportation vehicles, which is being brought about an important innovation in the World Auto Industry. Unlike traditional internal combustion engines, the output power of frequent adjustment of DC power will seriously affect the life of the vehicle-powered fuel cell and lithium battery, and due to the shortcomings of the traditional control system, the control response speed is slow, the system energy loss is equal, etc. It is largely constrained hybrid car development.[0003]China Patent Document "201511003962.3" proposes an aut...

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Problems solved by technology

[0005] The technical problem to be solved by the invention is: aiming at the technical problems existing in the prior art, provide a speed control method for a hybrid electric vehicle, overcome the shortcoming of frequent changes in the output power of a DC power supply, and solve the problem of high energy consumption of the speed control system of a hybrid electric vehicle problem, improve the response speed of the entire hybrid vehicle speed control system, and reduce the energy consumption of the system

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