Engine Control for Idle Stop Shift Shock and Delay
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Solution Overview
Problem
Existing engine control methods for vehicles with idle stop functions fail to smoothly and quickly shift the transmission from neutral to driving position, leading to shift shock and start delay when starting after idle stop, due to rapid engine torque changes.
Innovation Solution
An engine control method that limits the maximum output torque of the engine to a predetermined level upon restart, gradually increasing it over time, until the transmission is shifted from neutral to driving position, and synchronizes with driver input and engine operations to prevent shock and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transmission is shifted from N-range to D-range when the driver steps on the acceleration pedal, then the vehicle can start after idle stop, but shift shock is caused and starting is delayed because the transmission is not quickly shifted to D-range
Solution Approach 1:
The control method shifts the transmission to D-range in advance before the driver steps on the acceleration pedal, rather than waiting for the shift command. This preliminary action ensures the transmission is already in the correct range when the driver accelerates, eliminating both shift delay and shift shock.
Solution Approach 2:
The system dynamically adjusts transmission shifting based on predicted driver intent and vehicle state. By monitoring conditions during idle stop and pre-shifting when appropriate, the system adapts the transmission control strategy to prevent harmful shifts while maintaining quick response when needed.
2Power
If the output torque of the engine is rapidly changed to quickly start the vehicle, then the vehicle can start quickly, but shift shock is caused and starting is delayed
Solution Approach 1:
The control method applies preliminary anti-action by limiting the engine output torque before the shift occurs. By restraining the torque output in advance and gradually increasing it, the system prevents the rapid torque changes that would cause shift shock, while still enabling the vehicle to start.
Solution Approach 2:
The system changes the engine output torque parameter dynamically during the starting process. By gradually increasing the torque from a limited initial value rather than applying full torque immediately, the system avoids causing shift shock while maintaining the ability to start the vehicle.
3Object-affected harmful factors
If the engine output torque is limited to prevent shift shock, then shift shock is reduced, but the vehicle cannot start quickly
Solution Approach 1:
The torque limitation is not static but dynamic - the system gradually increases the engine output torque from a limited initial value. This dynamic adjustment allows the vehicle to start without excessive torque that would cause shift shock, while still providing increasing power to overcome the initial delay.
Solution Approach 2:
The transmission is shifted to D-range in advance before full torque is applied. This preliminary transmission positioning, combined with gradual torque increase, allows the vehicle to start smoothly without shift shock while minimizing start delay through proactive preparation.
Data Source
AI summary
The present invention makes it possible to smoothly and quickly shift a transmission from a neutral position to a driving position and prevent a shift shock and a start delay by appropriately controlling an engine output when a vehicle with an idle stop function is started after an idle stop.