Vehicle Control Device Torque Reduction for Steering Response
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Solution Overview
Problem
Vehicle attitude control systems using cylinder deactivation engines experience response degradation and time delays during torque reduction, particularly at low engine speeds or reduced-cylinder operations, leading to discomfort and failure to achieve desired vehicle behavior during turns.
Innovation Solution
A vehicle control device that adjusts the torque reduction amount based on the engine's combustion frequency per unit time, with larger reductions during reduced-cylinder operations and low engine speeds, to ensure timely and effective torque reduction and maintain desired vehicle attitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicle attitude control is performed by reducing engine torque during steering operation, then vehicle stability and cornering performance improve, but response time degrades in reduced-cylinder operation and low engine speed conditions
Solution Approach 1:
The control system dynamically adjusts the torque reduction amount based on real-time detection of engine operating conditions (combustion frequency, cylinder operation mode, engine speed). When reduced-cylinder operation or low engine speed is detected, the system increases the torque reduction amount to compensate for the longer combustion time interval, ensuring consistent vehicle attitude control response across all operating conditions.
Solution Approach 2:
The invention changes the torque reduction parameter (torque reduction amount) based on engine operating parameters (combustion frequency, cylinder operation mode). By detecting the engine's combustion frequency and operation mode, the system adjusts the torque reduction amount to maintain optimal response characteristics across different engine states, particularly compensating for the degraded response in reduced-cylinder operation.
2Use of energy by moving object
If reduced-cylinder operation is used to improve fuel efficiency, then energy consumption decreases, but torque reduction response degrades due to longer combustion time intervals
Solution Approach 1:
The control system dynamically adapts the torque reduction strategy based on the detected cylinder operation mode. When reduced-cylinder operation is detected, the system automatically increases the torque reduction amount to compensate for the longer combustion time interval, ensuring that torque reduction response remains effective while maintaining the fuel efficiency benefits of reduced-cylinder operation.
Solution Approach 2:
The invention adjusts the torque reduction parameter based on the engine's cylinder operation mode. By detecting whether the engine is in reduced-cylinder or all-cylinder operation, the system modifies the torque reduction amount to maintain consistent response characteristics, allowing reduced-cylinder operation to be used for fuel efficiency without sacrificing vehicle attitude control performance.
3Loss of energy
If combustion frequency is low (low engine speed or reduced-cylinder operation), then engine operating costs decrease, but vehicle attitude control response deteriorates
Solution Approach 1:
The control system continuously monitors engine operating conditions (combustion frequency, cylinder operation mode, engine speed) and uses this feedback to adjust the torque reduction amount. When low combustion frequency conditions are detected (indicating reduced-cylinder operation or low engine speed), the system increases the torque reduction amount to compensate for the degraded response, ensuring consistent vehicle attitude control performance across all operating conditions.
Solution Approach 2:
The invention changes the torque reduction parameter based on the detected combustion frequency and engine operating mode. By detecting the engine's state, the system adjusts the torque reduction amount to maintain optimal response characteristics, particularly compensating for the longer combustion time interval in reduced-cylinder operation and low engine speed conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents response degradation of torque reduction, ensuring a comfortable and stable vehicle attitude during turns by increasing torque reduction amounts during reduced-cylinder operations and low engine speeds, thereby improving turnability and steering response.
Implementation Method 1
In the all-cylinder operation, combustion of a mixture gas is performed in all cylinders, and in the reduced-cylinder operation, the combustion of the mixture gas in one or some of the cylinders is suspended.
Data Source
AI summary
A vehicle control device is provided, which includes an engine, an engine control mechanism configured to control torque generated by the engine, a processor configured to execute a vehicle attitude controlling module to control attitude of a vehicle by controlling the engine control mechanism to reduce the torque so as to decelerate the vehicle, when a condition that the vehicle is traveling and a steering angle related value that is related to a steering angle of a steering device increases is satisfied, and a torque reduction amount setting module to set the reduction amount of the torque to be larger as a combustion frequency of the engine per unit time decreases. The vehicle attitude controlling module controls the engine control mechanism to reduce the torque based on the set reduction amount.