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Control device of automatic transmission

A technology of automatic transmission and control device, applied in the direction of transmission device control, elements with teeth, belt/chain/gear, etc., can solve the problems of rising manufacturing cost and increasing failure rate.

Inactive Publication Date: 2018-03-13
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the technology disclosed in the above-mentioned patent documents has problems from the standpoints of manufacturing cost and reliability.
That is, there is always a demand to reduce the manufacturing cost of the automatic transmission of the vehicle, but in the technology disclosed in the above-mentioned patent document, since two sensors for detecting a failure of the parking lock mechanism are provided, the manufacturing cost increases.
[0005] In addition, in the technology disclosed in the above-mentioned patent documents, since two sensors are provided, the failure rate increases

Method used

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no. 1 approach

[0024] 1. Structure of vehicle 1

[0025] use figure 1 The configuration of the vehicle 1 according to the present embodiment will be described. figure 1 It is a schematic diagram showing a partial structure of the vehicle 1 .

[0026] Such as figure 1 As shown, a vehicle 1 has an engine 2 , an automatic transmission 3 , a differential gear 4 , a drive shaft 5 and wheels 6 .

[0027] The engine 2 is provided as a driving source in the vehicle 1 and is an internal combustion engine that obtains power by internally combusting fuel. The form of the engine 2 is not particularly limited, and as an example, a four-stroke multi-cylinder gasoline engine can be used. A crankshaft of the engine 2 is connected to an automatic transmission 3 .

[0028] The automatic transmission 3 is a continuously variable transmission or a planetary gear type automatic transmission that decelerates the rotation of the crankshaft of the engine 2 and transmits it to the drive shaft 5 . The vehicle 1...

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Abstract

The invention relates to a control device of an automatic transmission. A shift position determination portion determines that operation of shifting a shift position from other range than a parking range to the parking range is conducted. A parking lock command portion causes a piston to maintain a state of being mechanically locked at a second position when the shift position is shifted to the parking range. An actuator drive command portion commands an actuator to drive the piston from the second position to a first position in a state where the position of the piston is mechanically lockedat the second position. A parking lock failure determination portion determines that the locking mechanism portion is in a failure in an unlocked state when the position of the piston goes out of thesecond position within a predetermined time after a command is issued. The device not only guarantees high reliability but also inhibits increase of manufacturing cost.

Description

technical field [0001] The invention relates to a control device for an automatic transmission in a shift-by-wire mode. Background technique [0002] The following structure is adopted in the automatic transmission of the shift-by-wire mode: a mechanical parking lock mechanism is provided to realize double insurance. Specifically, the lock-up mechanism is provided in such a way that the state other than the parking range can be maintained even if the hydraulic pressure drops during driving in the previous forward range. , even if the hydraulic pressure is activated, the parking state will not be released. [0003] In the above-mentioned parking lock mechanism section, it is necessary to provide a structure for detecting both a failure in a locked state and a failure in an unlocked (unlocked) state. Japanese Patent Laid-Open Publication No. 2007-303680 (patent document) discloses a configuration for detecting failure of the above-mentioned parking lock mechanism unit. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H63/34F16H61/30
CPCF16H61/30F16H63/3483F16H2061/308F16H59/68F16H2061/1208F16H2061/1216F16H61/12
Inventor 木村隆浩重中康夫泽研司景山庆太郎石山贵士藤川昌道
Owner MAZDA MOTOR CORP
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