Deceleration Control for Lockup Clutch and Alternator Regeneration
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Solution Overview
Problem
Existing vehicle control methods during deceleration running often result in overlapping timing of regenerative power generation stop and lockup clutch release, leading to a sudden loss of deceleration feeling and deterioration of driving performance, making it difficult to achieve both driving performance and fuel consumption efficiency.
Innovation Solution
The control method involves setting distinct first and second vehicle speed threshold values based on the deceleration rate, where the lockup clutch is released when the vehicle reaches the first speed threshold and regenerative power generation is stopped at the second speed threshold, preventing the timing overlap and optimizing both driving and fuel consumption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative power generation is stopped when vehicle speed reaches a given value during deceleration, then fuel consumption performance is improved, but driving performance deteriorates due to sudden loss of deceleration feeling when timing overlaps with lockup clutch release
Solution Approach 1:
The patent segments the speed threshold control into two distinct thresholds: a first vehicle speed threshold for stopping regenerative power generation and a second vehicle speed threshold for releasing the lockup clutch. By dividing the single threshold control into separate thresholds, the patent prevents overlapping operations and eliminates the sudden loss of deceleration feeling, thereby resolving the contradiction between fuel consumption performance and driving performance.
2Device complexity
If a single speed threshold is used for both regenerative power generation stop and lockup clutch release, then control simplicity is maintained, but timing overlap occurs causing deterioration of driving performance
Solution Approach 1:
The patent divides the single speed threshold control into two separate speed thresholds: a first vehicle speed threshold for stopping regenerative power generation and a second vehicle speed threshold for releasing the lockup clutch. This segmentation prevents timing overlap between these operations, eliminating the sudden loss of deceleration feeling while maintaining relatively simple control logic through threshold-based decision making.
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 approach ensures non-overlapping stop timing of regenerative power generation and lockup clutch release, enhancing driving performance and fuel efficiency by adjusting speed thresholds according to deceleration rates, thereby preventing engine stalling and maintaining smooth deceleration feel.
Implementation Method 1
stopping regenerative power generation of an alternator
Data Source
AI summary
A control unit (21) causes release of a lockup clutch (3a) when a speed of a vehicle reaches a first vehicle speed value (V1), which is set according to a deceleration rate of the vehicle, during deceleration running of the vehicle. Further, the control unit (21) stops regenerative power generation of an alternator (11) when the speed of the vehicle reaches a second vehicle speed value (V2), which is varied according to the deceleration rate of the vehicle, during the deceleration running of the vehicle. By this control, the stop timing of the regenerative power generation of the alternator (11) during the deceleration running is set in accordance with the deceleration rate of the vehicle whereby the vehicle achieves both of fuel consumption performance and driving performance.