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Gear shift reminder method for ethanol flexible fuel vehicles

A flexible fuel and ethanol technology, applied in the direction of components with teeth, belts/chains/gears, mechanical equipment, etc., can solve the problems of invariability, single matching gear, and changes in engine output characteristics, so as to improve fuel economy. Effect

Active Publication Date: 2016-08-24
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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Problems solved by technology

The optimal matching gear of this motor vehicle shift reminder system is single, and cannot change with the change of fuel concentration. Therefore, this motor vehicle gear shift reminder system will not be applicable to ethanol flexible fuel vehicles
However, due to the difference in the concentration of ethanol gasoline and the fuel concentration is constantly changing during use, the output characteristics of the engine will also change. Therefore, it is necessary to develop a set of methods suitable for determining the shift speed of ethanol flexible fuel vehicles. The best economic shift schedule can be fitted according to the concentration of ethanol gasoline

Method used

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  • Gear shift reminder method for ethanol flexible fuel vehicles
  • Gear shift reminder method for ethanol flexible fuel vehicles

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0026] Such as figure 1 Shown, a kind of shift prompting method of ethanol flexible fuel vehicle comprises the following steps:

[0027] (1) Through the gearbox output shaft speed n out and the ratio of the engine speed N to determine the speed ratio i, where the gearbox output shaft speed n out The driving wheel speed N that can be detected by the wheel speed sensor 0 , using the wheel reducer i 0 , the main reducer i, the variable speed ratio i of each stage and the transmission efficiency η are calculated, and a sensor can also be installed on the output shaft of the gearbox to measure the speed n of the output shaft of the gearbox through the sensor out . The engine speed N can be measured by the crankshaft sensor.

[0028] (2) compare said speed ratio i with the speed ratio of each gear in the gearbox to determine the gear to which th...

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Abstract

An ethanol flexible fuel automobile gear-shifting prompting method, comprising the following steps: (1) determining a speed ratio i from a ratio of a gearbox output shaft rotation speed n out and an engine rotation speed N; (2) comparing the speed ratio i with speed ratio of respective gears in the gearbox to determine the gear of the vehicle; (3) determining a fitting coefficient according to the gear in step (2), and combining the same with a current fuel concentration a% to fit a gear shift vehicle speed according to the current fuel concentration a% and the current gear; and (4) when the vehicle speed reaches the gear shift vehicle speed of step (3), prompting to shift a gear of the vehicle. The gear-shifting prompting method performs fitting to achieve the most economic gear-shifting rule according to an ethanol / gasoline concentration, thus enabling the vehicle to always prompt the driver to shift gear in an economic gear-shifting zone, and improving vehicle fuel economy.

Description

technical field [0001] The invention belongs to the field of vehicle control, in particular to a gear shift prompt method for ethanol flexible fuel vehicles. Background technique [0002] Ethanol fuel has high oxygen content, which is conducive to full combustion, and can effectively reduce vehicle exhaust emissions and improve energy structure. It is a new type of renewable clean fuel. In practical applications, a small amount of gasoline is often added to ethanol fuel to improve its cold start performance. This mixed fuel is called ethanol gasoline, which can be divided into low-concentration ethanol gasoline and high-concentration ethanol gasoline according to the proportion of gasoline mixed. [0003] There is an existing motor vehicle shift prompt system, which includes a vehicle speed sensor for detecting the driving speed of the motor vehicle and an inclination sensor for detecting the longitudinal angle between the plane where the chassis frame of the motor vehicle i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H59/70F16H59/72F16H63/42
CPCF16H59/70F16H59/72F16H63/42
Inventor 胡福建胡俊勇李财宝李杰
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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