Vehicle control device
The vehicle control device addresses crank shock by adjusting the shift line to lower vehicle speed in the automatic transmission, reducing sliding portion surface pressure and preventing stick-slip and shock in propeller shafts.
JP2026023268APending Publication Date: 2026-02-13TOYOTA JIDOSHA KK
Patent Information
- Application Number
- JP2024125168
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2026-02-13
AI Technical Summary
Technical Problem
Existing technologies fail to effectively prevent crank shock in propeller shafts due to increased friction coefficient during high temperature or initial operation, leading to stick-slip and shock when the sliding portion's extension force exceeds frictional force.
Method used
A vehicle control device that adjusts the shift line from 1st to 2nd gear in the automatic transmission to a lower vehicle speed based on driving history to reduce sliding portion surface pressure and prevent crank shock.
Benefits of technology
Suppresses crank shock by reducing sliding portion surface pressure through early shifting to 2nd gear, mitigating stick-slip and shock occurrences.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure 2026023268000001_ABST
Abstract
To provide a vehicle control device capable of suppressing the occurrence of a crank shock.SOLUTION: When it is determined that there is a possibility of the occurrence of the crank shock from the traveling history of the vehicle, a shift line from a first speed to a second speed of a shift map of an automatic transmission is changed to a lower vehicle speed side than a normal time. Thus, when it is determined from the travel history of the vehicle that the friction coefficient of the slide portion is large and the crank shock is likely to occur, for example, when the temperature of the slide portion is high or the vehicle travel distance is short, the upshift of the automatic transmission to the second speed is advanced to the low vehicle speed side, so that the slide portion surface pressure is reduced in the extension of the slide portion, and the occurrence of the crank shock is suppressed.SELECTED DRAWING: Figure 3
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Citation Information
Patent Citations
Lubricant composition for propeller shaft sliding yoke mechanism, propeller shaft sliding yoke mechanism, and lubrication method
JP2015074659A