Engine Restart Prohibition Unit for Accurate Detection
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Solution Overview
Problem
Existing vehicle control systems erroneously determine engine restart when the engine rotation speed exceeds the restart completion determination value immediately after the stop condition no longer holds, leading to incorrect restart determinations during automatic engine stop processes.
Innovation Solution
A vehicle control device and method that includes a drive source control unit for stopping and restarting the engine based on predetermined conditions, a drive source restart determination unit, and a restart determination prohibition unit to prevent erroneous restart determinations by prohibiting restart determination until specific conditions are met, ensuring accurate engine restart assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the engine restart determination is made based on engine rotation speed exceeding the restart completion determination value, then the restart detection speed is improved, but erroneous restart determination occurs when the stop condition no longer holds immediately after engine stop
Solution Approach 1:
The patent applies preliminary action by setting a prohibition period after the restart command is issued, during which restart determination is blocked. This preliminary timing control prevents the system from making determination too early when rotation speed may be falsely high, ensuring reliable detection by waiting until the prohibition period expires before evaluating the restart condition.
Solution Approach 2:
The patent uses feedback by continuously monitoring the engine rotation speed and comparing it against the restart completion determination value, while also considering the timing relative to the restart command issuance. The system adjusts its determination behavior based on the feedback from both the rotation speed sensor and the command timing, preventing erroneous determination when the speed threshold is temporarily exceeded during stop conditions.
2Speed
If the engine is restarted immediately when the stop condition no longer holds, then the response time is improved, but torque input may occur before the variator is ready causing component damage
Solution Approach 1:
The patent applies preliminary action by issuing the restart command before the actual restart completion, allowing the variator and transmission system to prepare for torque input. The prohibition period and determination timing ensure that the engine is restarted at an appropriate moment when the variator is ready to handle torque, preventing component damage while maintaining responsive restart behavior.
Data Source
AI summary
A vehicle control device for controlling a vehicle includes a drive source control unit adapted to output a command for automatically stopping a drive source when a first predetermined condition is satisfied and output a command for restarting the drive source when a second predetermined condition is not satisfied after the command for automatically stopping the drive source is output, a drive source restart determination unit adapted to determine that the drive source has restarted when a third predetermined condition is satisfied after the command for restarting the drive source is output, and a restart determination prohibition unit adapted to prohibit a restart determination by the drive source restart determination unit at least until the third predetermined condition is no longer satisfied when the third predetermined condition is satisfied and the command for restarting the drive source is output.