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Gear shifting control method of mechanical automatic transmission

A technology of automatic transmission and control method, which is applied in the direction of transmission control, mechanical equipment, components with teeth, etc., can solve the problem of missing engine power or economical shift work points, etc., and achieve perfect control methods and functions, The effect of improving economy and power

Active Publication Date: 2012-12-19
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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  • Summary
  • Abstract
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AI Technical Summary

Benefits of technology

This patented system allows for quick and efficient shifts with an improved efficiency compared to traditional methods like hydraulic or electric systems. It uses signals from various sensors on-board the car's body (engine) to determine if it needs to be moved quickly during certain stages of driving conditions. When this happens, the system will automatically switch off its engine drive motor until needed again. By doing these actions, the driver can have better fuel mileage performance while also reducing emissions caused by excessive use of fossil fuels used in vehicles.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving electronic controls over conventional automobile systems that use wet frictional clutches (WFC) instead of manually operated gears. These improvements improve fuel economy while maintaining good drive experience during acceleration from rest.

Method used

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  • Gear shifting control method of mechanical automatic transmission
  • Gear shifting control method of mechanical automatic transmission

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Embodiment Construction

[0025] The invention aims to solve the problem that the car misses the best shifting working point due to mechanical delay when shifting gears, and proposes a shifting control method that controls the actuator to complete the free gap in advance. The technical scheme of the present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0026] Technical scheme of the present invention is as follows:

[0027] The invention proposes a shift control method of an electronically controlled mechanical automatic transmission. Before the method is implemented, the time Time_off_free required by the clutch actuator to complete the free gap can be obtained according to the inherent characteristics of the vehicle, and this time exists as a fixed value in the control method. The steps of the control method are:

[0028] Step 1, the control method detects the vehicle speed and the acceleration of the vehicle in real time;

[00...

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Abstract

The invention provides a gear shifting control method of a mechanical automatic transmission, which belongs to the technical field of automatic control of an automobile. The optimal dynamic or economical gear shifting operating point of an engine has been actually missed already even if gear shift is carried out when a vehicle meets the gear shifting condition as a result of mechanical delay of conventional mechanical automatic transmission during gear shift. The technical scheme provided by the invention is that the method comprises the steps of: calculating time from current start of operation to the gear shift point of the vehicle by current velocity and acceleration of the vehicle; comparing the time with the time of a clutch executing mechanism which travels freely; and controlling the clutch executing mechanism to travel freely in advance so that the clutch executing mechanism is in a standby state, therefore, the response time of a clutch is effectively shortened, and the economical efficiency and dynamic property of the vehicle are improved.

Description

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Claims

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Application Information

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Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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