Autonomous Transmission Control Without First-Gear Shift Shock
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Solution Overview
Problem
During autonomous driving, the strong gear change shocks experienced during upshifts and downshifts to and from the first gear stage cause discomfort to the driver due to higher sensory sensitivity compared to manual driving.
Innovation Solution
The automobile is equipped with a controller that prohibits the use of the first gear stage during autonomous driving in non-sport travel modes and allows skipping upshifts to reduce the number of gear changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the first gear stage is used during autonomous driving, then the automobile can achieve strong acceleration performance, but strong gear change shocks occur during upshifts and downshifts to the first gear stage causing driver discomfort
Solution Approach 1:
The patent extracts and removes the first gear stage from the automatic gear change device during autonomous driving operation. The controller prohibits selection of the first gear stage, effectively taking out the problematic gear from the system when autonomous driving is active, thereby eliminating the source of strong gear change shocks while preserving other gear stages for normal operation
Solution Approach 2:
The patent dynamically adjusts the available gear stages based on the driving mode. When autonomous driving is detected, the system transitions from allowing all gear stages including first gear to prohibiting first gear selection. This dynamic adaptation allows the system to optimize for comfort during autonomous driving while maintaining acceleration capability through other gear stages
2Object-affected harmful factors
If the first gear stage is prohibited during autonomous driving, then gear change shocks are reduced, but the acceleration capability in low-speed situations may be limited
Solution Approach 1:
The patent merges the functions of the first gear stage with other low gear stages (second gear and higher) during autonomous driving. By prohibiting only the first gear stage while allowing other gear stages to operate, the system combines the acceleration capability of multiple gear stages to maintain overall acceleration performance while eliminating the specific problem of strong shocks associated with first gear changes
Data Source
AI summary
An automobile including a surroundings recognition device, a drive device, an automatic gear change device, a brake device, and a controller is provided. The surroundings recognition device is configured to acquire information on surroundings of a vehicle. The controller is configured to control at least the drive device, the automatic gear change device, and the brake device such that the automobile travels by autonomous driving using information from the surroundings recognition device. The controller is configured to prohibit the use of a predetermined low gear stage on a low-speed side in the automatic gear change device when the automobile travels by autonomous driving using a predetermined travel mode.