Vehicle Differential Power Control for Drivability
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Solution Overview
Problem
Power reduction control in vehicles with differential sections is ineffective due to variations in differential state, leading to excessive power reduction or insufficient reduction, causing drivability issues, gear shift shocks, and increased fuel consumption and exhaust gases.
Innovation Solution
A control apparatus that adjusts prime mover power by determining a reference rotational speed for zero energy change in the differential section, calculates rotational speed differentials, and uses a power balance equation to determine the power reduction amount, ensuring appropriate power reduction regardless of differential state variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power reduction control is implemented without considering differential state, then power reduction is applied uniformly, but the power reduction amount becomes excessive or insufficient leading to drivability deterioration and increased fuel consumption
Solution Approach 1:
The control apparatus changes the power reduction amount based on the rotational speed parameter of the first rotating element. By adjusting the power reduction amount according to the rotational speed (reducing more power at lower speeds, less power at higher speeds), the system adapts to differential state variations and maintains optimal drivability while minimizing unnecessary fuel consumption.
Solution Approach 2:
The control system uses feedback from the rotational speed sensor to continuously monitor the rotational speed of the first rotating element. This feedback information is used to dynamically adjust the power reduction amount, ensuring that the control action is appropriate for the current differential state and avoiding both excessive and insufficient power reduction.
2Device complexity
If power reduction control is implemented without considering differential state, then control simplicity is maintained, but gear shift shocks occur due to inappropriate power reduction amounts
Solution Approach 1:
The system changes the power reduction amount based on the rotational speed parameter to eliminate gear shift shocks. By implementing this parameter-based adjustment, the patent resolves the contradiction by showing that the additional control complexity is minimal (using existing rotational speed data) while the benefit of eliminating gear shift shocks is significant.
3Ease of operation
If uniform power reduction is applied regardless of rotational speed, then control implementation is simple, but the differential state variations cause ineffective power reduction control
Solution Approach 1:
The control apparatus adjusts the power reduction amount based on the rotational speed of the first rotating element. This parameter change approach improves power reduction effectiveness by adapting to differential state variations while maintaining relatively simple control logic that uses existing sensor data.
Solution Approach 2:
The system implements dynamic power reduction control where the power reduction amount varies with rotational speed. This dynamic adjustment ensures that the control remains effective across different operating conditions (coasting, acceleration, deceleration) without requiring complex control algorithms.
Data Source
AI summary
A control apparatus for a vehicle including a differential section having a first rotating element coupled to a prime mover and a second rotating element connected to drive wheels via an engaging and disengaging apparatus, including: a controller configured to control connection of the engaging and disengaging apparatus, the controller being configured to adjust a power of the prime mover, the controller being configured to reduce the power of the prime mover when performing connection of the engaging and disengaging apparatus, and the controller being configured to reduce more power of the prime mover as a speed of rotation of the first rotating element is lower.