Automatic Transmission Control Inhibiting Gear Shifts Before Inertia Phase
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Solution Overview
Problem
Conventional automatic transmission control systems often generate shocks and engine racing due to inaccurate detection of piston stroke return quantity and clutch capacity during change mind gear shifts, especially when the gear shift request occurs before the inertia phase starts.
Innovation Solution
A control apparatus for automatic transmission that includes a first frictional clutching element engaged at one gear stage and released at another, with automatic and manual transmission means, and inertia phase determining means, which inhibits or suspends gear shifts based on the phase and intention of the driver to prevent shocks and engine racing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the modification of the target gear shift stage is allowed before the start of the inertia phase, then the gear shift control can respond to driver's intention, but shocks and engine racing are generated due to inaccurate detection of piston stroke return quantity and clutch capacity
Solution Approach 1:
The control apparatus waits for the inertia phase to start before allowing modification of the target gear shift stage. This preliminary waiting period ensures that the frictional clutching element has sufficient time to complete its piston stroke return and achieve accurate detection of clutch capacity, thereby preventing shocks and engine racing while still responding to driver's intention after the safe threshold is reached.
Solution Approach 2:
The control apparatus monitors the timing of gear shift requests relative to the inertia phase start, and based on this feedback, dynamically determines whether to allow or inhibit modification of the target gear shift stage. This feedback mechanism ensures that modifications are only permitted when detection accuracy is sufficient, preventing harmful effects while maintaining responsiveness.
2Object-affected harmful factors
If the modification of the target gear shift stage is inhibited after the start of the inertia phase, then shocks and engine racing are prevented, but the gear shift control cannot respond to driver's intention
Solution Approach 1:
The control apparatus establishes the inertia phase start as a preliminary threshold that must be reached before allowing gear shift modification. By waiting for this phase to complete, the system ensures accurate detection of clutch capacity and piston stroke return, preventing shocks and engine racing while still permitting responsive control after the safe threshold is achieved.
Solution Approach 2:
The control apparatus uses feedback from the inertia phase timing to dynamically control whether modifications are allowed. When the inertia phase has started and detection accuracy is sufficient, the system permits modifications to respond to driver's intention, creating an optimal balance between preventing harmful effects and maintaining responsiveness.
3Adaptability or versatility
If multiple frictional clutching elements are increased to support more gear shift stages, then the number of gear shift stages is increased, but the frequency of gear shift occurrence is increased leading to more change mind gear shift requests
Solution Approach 1:
The control apparatus waits for the inertia phase to start before allowing modification of the target gear shift stage. This preliminary waiting period prevents premature modifications that would cause shocks and engine racing, thereby enabling the system to safely handle the increased frequency of change mind gear shift requests that result from having more gear shift stages.
Solution Approach 2:
The control apparatus monitors the timing of gear shift requests relative to the inertia phase and uses this feedback to determine whether to allow modifications. This feedback mechanism prevents harmful effects from frequent gear shifts while still permitting responsive control, enabling the system to manage the higher frequency of change mind gear shift requests that occur with multiple gear shift stages.
Data Source
AI summary
In a control apparatus for an automatic transmission, a gear shift from a second gear shift stage to a first gear shift stage is inhibited and the gear shift from the first gear shift stage to the second gear shift stage is continued, when, during the gear shift from the first gear shift stage to the second gear shift stage, a request of the gear shift from the second gear shift stage to the first gear shift stage by means of an automatic transmission section has occurred during a time duration from a time at which a gear shift command from the first gear shift stage to the second gear shift stage is issued to a time at which an inertia phase is started.