Protective control device for automatic transmission

A technology of automatic transmission and protection control, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve problems such as oil temperature rise, prevent oil temperature from rising again, and prevent oil temperature from rising. , the effect of preventing discomfort

Active Publication Date: 2016-02-10
HONDA MOTOR CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] However, in the protective control device of the above-mentioned automatic transmission, even if the oil temperature is lowered by automatic upshifting due to the rise of the oil temperature, when the gear of the automatic transmission is already the highest gear, further upshifting cannot be performed. There is a possibility that the oil temperature will rise further

Method used

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  • Protective control device for automatic transmission
  • Protective control device for automatic transmission
  • Protective control device for automatic transmission

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Embodiment Construction

[0035] Below, according to Figure 1 to Figure 7 Embodiments of the present invention will be described.

[0036] Such as figure 1 As shown, the vehicle of this embodiment has, for example, an automatic transmission T with 6 forward speeds. The cooling water of the engine E pumped out by the cooling water pump 11 passes through the oil cooler 12 to cool the oil of the automatic transmission T, and passes through the heat exchanger 13 and The heat is exchanged between the air, and the engine E is cooled by the water cooling jacket. The automatic transmission T has a main shaft 16 connected to the crankshaft 14 of the engine E via a torque converter 15, a counter shaft 17 connected to the main shaft 16 via a plurality of hydraulic clutches and gear trains, and a differential gear 18 connected to the counter shaft 17, The differential gear 18 is connected to the left and right drive wheels W, W.

[0037] To the electronic control unit U for protective control against an excess...

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Abstract

The protection control device of the automatic transmission is provided, which can reliably prevent the oil temperature of the automatic transmission from rising. When the vehicle speed is above the 1st vehicle speed and the oil temperature is above the 1st oil temperature, the gear change unit forcibly upshifts from the current gear, so that the input speed in the automatic transmission can be reduced by upshifting to prevent oil temperature fluctuations. rise. And after the forced upshift is performed, the shift limiting unit restricts the downshift shift based on the automatic shift as well as the driver's operation, so it is possible to prevent a situation where the input rotation speed in the automatic transmission increases due to the downshift, so that the oil temperature rises again . Moreover, when the oil temperature reaches the second oil temperature higher than the first oil temperature and the maximum vehicle speed is above the second vehicle speed higher than the first vehicle speed, the maximum vehicle speed limiting unit limits the maximum vehicle speed to the third vehicle speed, so even at the current Even when the gear is the highest gear and it is not expected to reduce the oil temperature by forced upshifting, it is also possible to prevent the oil temperature from rising by limiting the maximum vehicle speed.

Description

technical field [0001] The present invention relates to a protective control device for an automatic transmission that lowers the oil temperature by limiting automatic upshifting or downshifting when the oil temperature of the automatic transmission rises. Background technique [0002] According to the following Patent Document 1, there is known a protective control device for an automatic transmission that automatically upshifts a shift gear when the oil temperature of the automatic transmission rises, and prevents As a result, when the oil temperature drops, the drop is permitted on the condition that predetermined running conditions such as the accelerator opening being below a predetermined value and the vehicle speed being below a predetermined value, or the engine speed being below a predetermined value are satisfied. files. [0003] [Patent Document 1] Japanese Patent Laid-Open No. 2009-281511 [0004] However, in the protective control device of the above-mentioned...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H59/72F16H59/36F16H61/16
CPCF16H59/72F16H61/16F16H59/50
Inventor 石川丰渡边将行今村一彦森隆一
Owner HONDA MOTOR CO LTD
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