Fuel-Saving Drive Recommendation System Gear Shift Timing
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Solution Overview
Problem
In vehicles equipped with step-gear automatic transmissions, the existing fuel-saving drive recommendation systems can cause an uncomfortable feeling for drivers due to delays in gear shifts, as the determination of a fuel-saving drive state changes before the engine rotational speed varies, leading to premature notification of fuel-saving status changes.
Innovation Solution
A fuel-saving drive recommendation system that calculates a separate determination required driving force using a different gear signal, synchronized with the gear instruction signal after a delay, to coincide with the engine rotational speed variation, thereby ensuring the notification of fuel-saving status aligns with the actual engine speed change during gear shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the required driving force is calculated using the gear instruction signal for torque demand control, then the determination accuracy for fuel-saving drive is improved, but the driver experiences an uncomfortable feeling due to premature notification before engine rotational speed varies during gear shifts
Solution Approach 1:
The system performs preliminary calculation of the required driving force using the gear instruction signal, but delays the actual determination notification until after the gear shift is complete. This allows the calculation to be prepared in advance while preventing premature notification that would cause driver discomfort.
Solution Approach 2:
The system introduces an intermediary timing mechanism that mediates between the early calculation of required driving force and the actual engine rotational speed variation. The determination is made based on the calculated value, but the notification is timed to occur only after the physical gear shift and engine speed change are complete, eliminating the uncomfortable premature notification.
2Measurement precision
If the determination of fuel-saving drive state is made based on required driving force calculated with gear instruction signal, then fuel-saving determination accuracy is improved, but the notification timing becomes misaligned with actual engine speed change
Solution Approach 1:
The system dynamically adjusts the notification timing based on the gear shift state. While the required driving force is continuously calculated using the gear instruction signal for accurate determination, the actual notification to the driver is dynamically timed to occur only after detecting that the gear shift and engine rotational speed variation are complete, ensuring proper synchronization.
Solution Approach 2:
The system uses feedback from the gear instruction signal and engine rotational speed sensors to determine when notification should occur. The required driving force is calculated continuously for accuracy, but the notification is triggered only when feedback indicates the gear shift is complete and engine speed has stabilized, aligning notification timing with actual engine state changes.
Data Source
AI summary
A fuel-saving drive recommendation system is mounted on a vehicle that includes a step-gear automatic transmission of which a gear is shifted in response to a gear instruction signal. The fuel-saving drive recommendation system calculates a required driving force based on an amount by which an output operating component is operated by a driver and a gear of the automatic transmission, makes determination for fuel-saving drive for the vehicle based on the required driving force and notifies the determination result. The fuel-saving drive recommendation system calculates a required driving force for performing output control on an engine and a required driving force for determining whether it is a fuel-saving drive state. A determination gear signal different from the gear instruction signal is used when the determination required driving force is calculated, and is changed to coincide with the gear instruction signal that has been changed.