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Method for controlling speed ratio of hybrid electric vehicle in driving process

A technology of hybrid power and control method, which is applied in the directions of hybrid power vehicles, motor vehicles, transportation and packaging, etc., can solve the problem that the speed ratio control of hybrid power vehicles cannot be directly applied, and achieve the effect of improving vehicle economy.

Active Publication Date: 2014-01-22
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the great difference in the working characteristics of the engine and the motor, although the speed ratio control method of conventional vehicles is relatively mature, this method cannot be directly applied to the speed ratio control of hybrid vehicles, especially the strong hybrid with pure electric drive. car speed ratio control

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  • Method for controlling speed ratio of hybrid electric vehicle in driving process
  • Method for controlling speed ratio of hybrid electric vehicle in driving process
  • Method for controlling speed ratio of hybrid electric vehicle in driving process

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Embodiment Construction

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0034] Such as figure 1 As shown, the hybrid electric vehicle speed ratio control method provided by the present invention comprises the following steps:

[0035] S1: Receive accelerator pedal opening, driver demand power, engine demand power and actual speed, motor demand power and actual speed, and vehicle speed.

[0036] S2: Measure ...

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Abstract

A method for controlling the speed ratio of a hybrid electric vehicle in the driving process comprises the steps that S1, a signal related to speed ratio control is received; S2, an efficiency graph of an engine and an efficiency graph of a motor are measured through experiments and optimal economical curves of the graphs are made respectively; S3, the optimal economical rotating speed of the engine under the required power and the optimal economical rotating speed of the motor under the required power are respectively calculated; S4, considering the required power ratios of the engine and the motor and influence, caused by the rotating speed, on the efficiency, the target rotating speed is calculated; S5, the target speed ratio is calculated through the target rotating speed, the vehicle speed and the main speed reducing ratio; S6, the target speed ratio is sent to a speed ratio control actuator to be executed. According to the method for controlling the speed ratio of the hybrid electric vehicle in the driving process, when the vehicle is driven in a hybrid mode, the ratios of work of the engine and work of the motor and different influences, caused by the rotating speed, on the efficiency of the engine and the efficiency of the motor are fully considered, so that the optimized target speed ratio is obtained, and the method enables the economical efficiency of the vehicle to be improved.

Description

technical field [0001] The present application relates to the technical field of vehicle drive control, in particular to a speed ratio control method and system for parallel strong hybrid vehicles (including plug-in strong hybrid vehicles). Background technique [0002] With the global energy shortage and environmental pollution caused by automobile emissions becoming more and more serious, it has become the consensus of all walks of life to promote new energy vehicles with low energy consumption and low emissions. Hybrid vehicles are the first choice for large-scale industrialization at present. With the increasing demand for performance and comfort, it is necessary to develop hybrid vehicles with automatic transmissions, especially continuously variable transmissions. Compared with manual transmissions or stepped automatic transmissions, continuously variable transmissions have greatly improved driving comfort and power. The main reason is that the speed ratio of the conti...

Claims

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Application Information

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IPC IPC(8): B60W20/00B60W10/06B60W10/08B60W20/10B60W20/30
CPCY02T10/6286B60W10/06B60W10/08B60W10/105B60W20/10B60W20/30B60W2510/0638B60W2510/0666B60W2510/081B60W2510/085B60W2520/10B60W2710/1005Y02T10/62
Inventor 刘杰严钦山李宗华苏岭
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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