Vehicle Control Device Torque Reduction Combustion Frequency
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Solution Overview
Problem
Conventional vehicle attitude control systems using cylinder deactivation engines experience response degradation and time delays in torque reduction during low engine speed or reduced-cylinder operation, leading to undesirable vehicle behavior and driver discomfort during turns.
Innovation Solution
A vehicle control device that includes an engine control mechanism, a processor, and sensors to determine the vehicle's travel state and steering angle, which adjusts torque reduction based on combustion frequency and engine operation mode, preventing execution of torque reduction controls when combustion frequency is low to maintain stable vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If vehicle attitude control is executed in reduced-cylinder operation or at low engine speed, then fuel consumption is reduced, but the response of torque reduction degrades and vehicle behavior becomes unstable
Solution Approach 1:
The control system dynamically adjusts the vehicle attitude control execution based on real-time engine operating conditions. When combustion frequency falls below a threshold (indicating reduced-cylinder operation or low engine speed), the system automatically suspends torque reduction control to prevent response degradation. This dynamic adaptation ensures stable vehicle behavior while allowing fuel-efficient operation modes.
Solution Approach 2:
The system monitors combustion frequency as a key parameter and uses it to determine whether to execute vehicle attitude control. By changing the control execution state based on combustion frequency thresholds, the system prevents torque reduction response degradation in reduced-cylinder operation while maintaining control effectiveness in all-cylinder operation.
2Speed
If torque reduction control is executed during reduced-cylinder operation, then vehicle deceleration is achieved, but time delays occur and cornering force timing becomes misaligned
Solution Approach 1:
The control system performs preliminary assessment of engine operating conditions (combustion frequency detection) before executing torque reduction control. By checking whether the engine is in reduced-cylinder operation or low-speed state beforehand, the system prevents execution under conditions that would cause time delays, ensuring timely torque reduction response when control is permitted.
3Use of energy by moving object
If combustion frequency is low, then engine load is reduced for fuel efficiency, but steering response and vehicle attitude control effectiveness decrease
Solution Approach 1:
The control system continuously monitors combustion frequency and uses this feedback to determine the appropriateness of executing vehicle attitude control. When combustion frequency indicates reduced-cylinder operation or low engine speed, the system suspends torque reduction control to maintain steering response quality. This feedback mechanism balances fuel efficiency with operational effectiveness.
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 and ensures desired vehicle behavior during turns by considering combustion frequency and engine operation mode, reducing driver discomfort and improving steering stability.
Implementation Method 1
combustion of a mixture gas is performed in all cylinders
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 steering device, and a processor. The processor determines whether a vehicle is traveling and a steering angle related value that is related to a steering angle of the steering device increases, executes a control of the engine control mechanism to reduce the torque when the vehicle is determined to be traveling and the steering angle related value is determined to increase, determines whether a combustion frequency of the engine per unit time is lower than a given value, executes the control for reducing the torque when the combustion frequency is determined to be higher than the given value, and prevents the execution of the control for reducing the torque when the combustion frequency is determined to be lower than the given value.