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Gear shift control method for automatic transmission (AT) under working condition of traffic congestion

A control method and transmission technology, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve the problems of automatic transmissions without control strategies

Inactive Publication Date: 2011-08-03
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For such frequent traffic jams, the automatic transmission does not have a separate control strategy. This is a new problem in urban development, and technological updates are needed to make up for this defect.

Method used

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  • Gear shift control method for automatic transmission (AT) under working condition of traffic congestion
  • Gear shift control method for automatic transmission (AT) under working condition of traffic congestion
  • Gear shift control method for automatic transmission (AT) under working condition of traffic congestion

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Embodiment Construction

[0011] The method of the present invention is that after the vehicle accelerates from rest, when the speed of the vehicle is always lower than a certain set value (such as the speed of the vehicle is lower than 25km / h), the transmission is prohibited from downgrading from the second gear to the first gear, and the transmission is allowed to work in the second gear to overcome the The unfavorable phenomenon of frequent shifting, until the vehicle speed exceeds the set limit (such as the vehicle speed is greater than 30km / h), this function stops working. The input signal is the vehicle speed signal and the gear position signal of the transmission, and the output signal is the downshift prohibition request issued by the transmission TCU.

[0012] For details, see figure 1 , the vehicle speed sensor collects the vehicle speed signal and transmits the signal to the ECU, and the gear position sensor of the transmission collects the gear position signal and transmits the signal to th...

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Abstract

The invention provides a gear shift control method for an automatic transmission (AT) under the working condition of traffic congestion. In the method, the AT is prohibited to be changed from a second gear position to a first gear position and is allowed to be operated at the second gear position when the speed of a vehicle is always lower than a certain set value after the vehicle is accelerated statically so as to overcome undesirable phenomena of frequent gear shift until the function is stopped when the speed of the vehicle is higher than the set limitation value, wherein an input signal is a vehicle speed signal and a transmission gear position signal; and an output signal is a downshift prohibition requirement transmitted by a transmission control unit (TCU). By the control method, the emission amount increase due to the change of the working condition of an engine caused by the gear shift of the AT is reduced while the phenomenon of frequent gear shift of the AT is prohibited under the working condition of traffic congestion, so that the method has the great advantages of protecting an actuating mechanism of the AT, improving the reliability of the AT and prolonging the service life of the AT.

Description

technical field [0001] The invention belongs to the technical field of automotive engine transmission control systems, and relates to a control method for an AT transmission mechanism to suppress frequent gear shifts in traffic jam conditions. The set vehicle speed limit controls the change of the gear position of the transmission to achieve the purpose of limiting frequent gear shifts and protecting the actuator of the transmission under traffic jam conditions. Background technique [0002] AT transmission has been favored by major automobile manufacturers since the 1980s due to its advantages of good comfort, compact mechanism, and reliable operation, and its research is also increasing year by year. AT transmission is a transmission with good comfort, low speed and high torque, which is very suitable for China's national conditions and will have great development in China. But the AT speed changer also has some shortcomings. For cars using AT transmissions during rush h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H59/02F16H61/02
Inventor 韩涌波刘小根叶伟
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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