Vehicle Control System for Smooth Acceleration
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Solution Overview
Problem
Conventional traction control systems for vehicles, particularly on bad road surfaces, fail to smoothly start and accelerate due to excessive engine speed increases, leading to wheel slip and discomfort for drivers, as they do not effectively reflect driver input and can result in engine stall if clutch operation is unskilled.
Innovation Solution
A control system that includes a driving state detector, rotational speed limiter, and termination unit to limit engine speed within a predetermined upper limit during starting and acceleration, allowing the engine speed to increase only when the vehicle transitions to normal driving conditions, thus preventing excessive speed and reflecting driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If engine speed is controlled to be low during starting to prevent wheel slip, then wheel slip is suppressed, but driver comfort deteriorates and accelerator operation is not reflected well
Solution Approach 1:
The system performs preliminary classification of driving states (starting state vs. normal driving state) before applying engine speed control. During starting state, engine speed is limited to prevent wheel slip, while during normal driving state, engine speed responds to accelerator operation, thereby resolving the contradiction between wheel slip suppression and driver comfort
Solution Approach 2:
The control system dynamically adjusts engine speed control strategy based on detected driving state. The engine speed upper limit is applied only during starting state and removed during normal driving state, making the system adaptive to different operational conditions and resolving the contradiction between preventing wheel slip and reflecting driver input
2Reliability
If traction control is used to suppress wheel slip, then wheel slip is reduced, but control complexity increases due to feedback control requirements
Solution Approach 1:
The system extracts and applies only the essential engine speed limiting function during starting state, removing the need for complex feedback control loops. By focusing on a single key control action (engine speed limitation) rather than comprehensive traction control, the system achieves wheel slip suppression with reduced complexity
3Reliability
If engine torque is reduced during slip to suppress wheel slip, then wheel slip is controlled, but impact mitigation is insufficient and driver comfort remains poor
Solution Approach 1:
The system performs preliminary engine speed limitation before wheel slip occurs during starting state, preventing the conditions that lead to impact transmission. By controlling engine speed in advance rather than reacting to slip after it occurs, the system both suppresses wheel slip and mitigates impact transmission to the driver
Data Source
AI summary
A control system for controlling a driving power source in a vehicle, includes a driving state detector for detecting a driving state of the vehicle; a first determiner for determining whether or not the driving state detected by the driving state detector is a first state; a second determiner for determining whether or not the driving state detected by the driving state detector is a second state; a rotational speed limiter for executing rotational speed limiting control for limiting a driving power source rotational speed to a predetermined upper limit value or less when the first determiner determines that the driving state is the first state, during an operation of the driving power source; and a rotational speed limiting termination unit for terminating the rotational speed limiting control, when the second determiner determines that the driving state is the second state, during the operation of the driving power source.