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Gear control method and device

A control method and gear technology, applied in the field of vehicles, to ensure driving safety and improve engine auxiliary braking power

Pending Publication Date: 2022-07-15
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for complex and changeable working conditions, when the auxiliary braking function of the engine retarder is turned on, how to reasonably control the gear change so as to maximize the auxiliary braking function is an important problem that needs to be solved urgently

Method used

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  • Gear control method and device
  • Gear control method and device

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Embodiment Construction

[0034] In order to make the above objects, features and advantages of the present application more clearly understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can do so without departing from the connotation of the present application. Similar promotion, therefore, the present application is not limited by the specific embodiments disclosed below.

[0036] As described in the background art, for complex and changeable working conditions, when the auxiliary braking function of the engine retarder is turned on, how to control the gear change reasonably so as to maximize the auxiliary braking function, which is urgently neede...

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Abstract

The gear control method and device are suitable for an automatic gear shifting transmission, and when the automatic gear shifting transmission is in a first gear at the first moment, an engine auxiliary braking request is obtained; the engine auxiliary braking request is used for requesting to start an engine retarder on the vehicle; the engine rotating speed corresponding to the first gear is a first rotating speed; calculating a preset rotating speed of the engine at a second moment according to the first rotating speed and the road condition information of the vehicle driving direction; the road condition information comprises road gradient and road length; if the first rotating speed is not larger than the threshold value and the preset rotating speed is not larger than the limiting value, the first gear is adjusted to be a second gear; the engine rotating speed corresponding to the second gear is a second rotating speed which is greater than the first rotating speed. The auxiliary braking power of the engine can be improved by increasing the rotating speed of the engine under the condition that the engine is not damaged, namely when the rotating speed does not exceed the limit value, the auxiliary braking function is exerted to the maximum extent, and driving safety is ensured.

Description

technical field [0001] The present application relates to the field of vehicles, and in particular, to a gear control method and device. Background technique [0002] Nowadays, more and more cars use automatic shift transmission (AMT) to realize shifting, which greatly facilitates the driving of the vehicle. Users do not need to manually switch gears during driving. AMT can automatically adjust the gear changes according to the driving situation. The choice of gear directly affects the power, fuel economy, safety, comfort, etc. of the car, which is one of the keys to automatic transmission control. [0003] The commercial vehicle AMT powertrain consists of a traditional internal combustion engine (hereinafter referred to as the engine) and an AMT gearbox. When the vehicle is driving in the Yunnan-Guizhou-Sichuan area, due to the continuous multi-slope and steep-slope working conditions, the functional safety of the vehicle should be fully considered. It can play the auxilia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02F16H61/21F16H59/66F16H59/36
CPCF16H61/0213F16H61/21F16H59/66F16H2059/366F16H2059/663
Inventor 孙晓鹏李传友
Owner WEICHAI POWER CO LTD
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