Anticipatory Engine Control for Acceleration Response
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Solution Overview
Problem
Existing vehicle control systems experience response delays when drivers accelerate after deceleration due to lane departure prevention or other automatic deceleration events, leading to delayed speed recovery.
Innovation Solution
A vehicle control apparatus that anticipates the driver's acceleration demand by shifting the internal combustion engine into a high response state before the acceleration operation, using controls such as adjusting air-fuel ratio, EGR rate, cylinder operation, throttle opening, valve timing, and turbocharging pressure to enhance engine responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal combustion engine is controlled to prioritize fuel efficiency over acceleration responsiveness, then fuel efficiency is improved, but acceleration responsiveness deteriorates
Solution Approach 1:
The control device performs acceleration preparation control before the driver's acceleration demand is actually detected. When the vehicle is traveling at constant speed, the system proactively prepares the engine for potential acceleration by adjusting air-fuel ratio, EGR rate, and other parameters in advance, so that when acceleration is needed, the engine can respond immediately without delay from fuel-efficient operating mode.
Solution Approach 2:
The system dynamically switches between fuel-efficient operation mode and acceleration-ready mode based on predicted driver intent. The control device continuously monitors driving conditions and automatically adjusts engine parameters (air-fuel ratio, EGR rate, throttle opening) to optimize for either fuel efficiency or acceleration responsiveness depending on the situation.
2Loss of energy
If the engine operates in a fuel-efficient mode, then energy consumption is reduced, but the response delay increases when acceleration is demanded
Solution Approach 1:
The system performs preliminary preparation for acceleration by adjusting engine parameters in advance before the driver actually demands acceleration. This includes pre-adjusting air-fuel ratio, EGR rate, and other parameters during constant-speed travel, eliminating the time delay that would otherwise occur when transitioning from fuel-efficient mode to acceleration mode.
3Speed
If the engine control prioritizes output responsiveness, then acceleration performance is improved, but fuel efficiency deteriorates
Solution Approach 1:
The control system dynamically adjusts engine operating parameters based on real-time driving conditions and predicted acceleration demands. During constant-speed travel, the engine operates in fuel-efficient mode, but when acceleration is anticipated, the system automatically transitions to acceleration-optimized parameters, achieving both fuel efficiency during cruising and rapid acceleration when needed.
Data Source
AI summary
A vehicle control apparatus includes an electronic control device that controls an internal combustion engine such that a response delay of the internal combustion engine at the time of acceleration is restrained for a predetermined time period from the time point at which an acceleration demand of a driver of a vehicle is estimated when the acceleration demand is estimated while the vehicle is travelling using a driving force from the internal combustion engine.