Engine Controller Drivability During Deceleration
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Solution Overview
Problem
Existing engine control systems experience drivability issues when transitioning from a decelerated to an accelerated state due to fluctuations in engine driving power, caused by fuel stop control and sudden changes in air-fuel ratio, leading to poor vehicle responsiveness and vibration.
Innovation Solution
An engine control system that includes an acceleration command input device and a braking command input device, with an engine controller that adjusts engine control components such as throttle valve opening, fuel injection, and ignition timing to prepare for acceleration during deceleration, ensuring a smooth transition by maintaining engine power and air-fuel ratio stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If fuel stop control is executed to improve fuel efficiency during deceleration, then fuel efficiency is improved, but drivability deteriorates due to engine power fluctuations when fuel injection is resumed
Solution Approach 1:
The engine controller executes driving power increasing preparation by changing the controlled amount of engine control components in advance when it is determined that inputting of the braking command stops during deceleration control. This preliminary action ensures that the engine is ready for smooth acceleration when the driver releases the brake, preventing power fluctuations and improving drivability while maintaining fuel efficiency benefits during deceleration.
2Speed
If the throttle valve is opened to accelerate the vehicle from a non-combustion state, then acceleration responsiveness is improved, but drivability worsens due to sudden transition from non-combustion to combustion state
Solution Approach 1:
The engine controller performs driving power increasing preparation by adjusting engine control components before the acceleration command is actually input. This preliminary adjustment prepares the engine for smooth transition from non-combustion to combustion state, ensuring that when the throttle valve is opened, the engine is already in an optimal state for combustion, thereby improving drivability while maintaining acceleration responsiveness.
Data Source
AI summary
A vehicle comprises an acceleration command input device operated by a driver to input an acceleration command; a braking command input device operated by the driver to input a braking command; and an engine controller for controlling a plurality of engine control components to change an engine driving power in response to the acceleration command and executing a deceleration control for reducing the engine driving power when a predetermined deceleration condition is met; the engine controller executing driving power increasing preparation for changing a controlled amount of at least one of the engine control components to increase the engine driving power while maintaining the deceleration control state when inputting of the braking command stops during the deceleration control, and changing a controlled amount of at least one of the engine control components to increase the engine driving power when the acceleration command is input thereafter.