Travel Controller Engine State Transition Compensation
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Solution Overview
Problem
Existing travel controllers face limitations in achieving mileage improvement when engine state transitions, such as stopping and starting, lead to disturbances that increase feedback control amounts, thereby reducing mileage efficiency.
Innovation Solution
A travel controller that includes a road information acquisition unit, a temporary target travel control pattern generation unit, an engine state transition section estimation unit, a speed difference calculation unit, and a target travel control pattern generation unit, which work together to generate a target travel control pattern that accounts for engine state transitions, reducing the impact of speed differences and improving mileage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is stopped to improve mileage, then fuel consumption is reduced, but disturbance occurs due to engine state transition which increases feedback control amount and reduces mileage improvement effect
Solution Approach 1:
The system performs preliminary action by predicting the engine state transition section before it occurs and pre-adjusting the target travel control pattern. The prediction unit identifies when engine stop/start will happen, and the correction unit prepares compensatory control adjustments in advance, so that when the transition occurs, the feedback control amount remains small and mileage improvement is maintained.
Solution Approach 2:
The system applies dynamics by making the target travel control pattern adaptive and changeable based on predicted engine state transitions. Rather than using a fixed control pattern, the system dynamically adjusts the target pattern to account for upcoming engine transitions, allowing optimal control values to be maintained throughout the transition period.
2Manufacturing precision
If feedback control is applied to maintain travel control plan, then travel accuracy is improved, but feedback control amount increases during engine transition which reduces mileage efficiency
Solution Approach 1:
The system performs preliminary action by predicting the engine state transition section before it occurs and pre-adjusting the target travel control pattern. The prediction unit identifies when engine stop/start will happen, and the correction unit prepares compensatory control adjustments in advance, so that when the transition occurs, the feedback control amount remains small and mileage improvement is maintained.
Solution Approach 2:
The system applies the skipping principle by rapidly transitioning through the engine state transition period with minimized feedback control. By predicting the transition and pre-adjusting the target pattern, the system rushes through the problematic transition phase with minimal energy loss, rather than spending excessive time and energy on feedback correction during the transition.
Data Source
AI summary
A travel controller which controls the travel of a vehicle includes a road information acquisition unit which acquires road information of a scheduled travel route, a temporary target travel control pattern generation unit which generates a temporary target travel control pattern of the scheduled travel route on the basis of the road information, an engine state transition section estimation unit which estimates an engine state transition section where the state of an engine transits when the vehicle travels using the temporary target travel control pattern, a speed difference calculation unit which calculates a speed difference resulting from variation in engine output in the engine state transition section, a target travel control pattern generation unit which corrects the temporary target travel control pattern on the basis of the speed difference to generate a target travel control pattern, and a travel control unit which performs travel control on the basis of the target travel control pattern.