Neutral State Transmission Learning via Input Rotation
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Solution Overview
Problem
Existing vehicle drive device control systems face limitations in learning response characteristics of transmission engagement devices, particularly when the transmission input member is not rotating, such as during vehicle stops, restricting opportunities for effective learning control.
Innovation Solution
A control device that actively drives a rotating electrical machine or internal combustion engine in a neutral state, allowing hydraulic pressure to be supplied to engagement operating parts of transmission engagement devices, enabling learning of response characteristics even when the transmission input member is not rotating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If learning control is performed based on transmission input member rotation detection, then learning can be performed during normal operation, but learning opportunities are lost during vehicle stops when the input member is not rotating
Solution Approach 1:
The system performs learning control in advance during vehicle stops (neutral state) by actively rotating the input member and supplying hydraulic pressure, so that learning data is accumulated before actual gear shifting occurs. This preliminary action ensures learning opportunities are not lost during periods when traditional methods would be inactive.
Solution Approach 2:
The system utilizes the vehicle stop period (neutral state) which would otherwise be idle time, to perform learning control automatically. By activating the input member rotation and hydraulic pressure supply during this self-available time window, the system converts non-productive time into productive learning opportunities without requiring additional dedicated learning time.
2Reliability
If the input member is kept stationary during vehicle stops, then energy is saved, but learning control cannot be performed
Solution Approach 1:
The system performs learning control periodically during vehicle stops (neutral states) rather than continuously. By detecting the neutral state and activating learning control only during these periodic intervals, the system accumulates learning data at appropriate moments without requiring continuous energy input, thus balancing reliability improvement with energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides numerous learning opportunities for transmission engagement devices, allowing for accurate learning of response characteristics in situations where traditional methods are limited, enhancing the system's adaptability and efficiency.
Implementation Method 1
supplying hydraulic pressure to an engagement operating part of a target engagement device
Data Source
AI summary
A control device with an electronic control unit that is configured to perform specific supply control, the specific supply control driving at least one of the rotating electrical machine and the internal combustion engine in a neutral state, and supplying hydraulic pressure to an engagement operating part of a target engagement device with at least one of the rotating electrical machine and the internal combustion engine being driven, the automatic transmission not transmitting power in the neutral state, and the target engagement device being one of the plurality of transmission engagement devices.