Throttle Valve Driving Amount Controller Damping Adjustment
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Solution Overview
Problem
Existing throttle valve control systems experience response delays and erroneous deviations in engine output control, leading to suboptimal performance in motorcycle and four-wheel vehicle engines.
Innovation Solution
A driving amount controller that adjusts motor output signals with a damping component to prevent overshooting, reducing damping when the deviation between target and actual driving amounts is near zero and increasing it with rising deviation or switching function value variations, enhancing response performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a throttle valve is connected to a motor and a return spring with regulation by motor energization in valve opening and closing directions, then the valve opening can be controlled bidirectionally, but a response delay is generated in the control of the opening of the throttle valve
Solution Approach 1:
The control system dynamically adjusts the damping output based on the deviation between target and actual driving amounts. When deviation is large, damping is increased to suppress oscillations; when deviation is small, damping is reduced to improve response speed. This dynamic adjustment resolves the contradiction between stable bidirectional control and fast response.
Solution Approach 2:
The damping output parameter is changed based on the deviation magnitude and switching function value. By varying the damping parameter according to system state, the control system achieves both stable bidirectional operation and fast response without the delays inherent in fixed-parameter spring-motor systems.
2Stability of the object's composition
If a damping output is added to the control signal to suppress overshoot, then overshoot of actual driving amount is reduced, but response performance deteriorates when damping is continuously applied
Solution Approach 1:
The damping output is dynamically adjusted based on system state. When the deviation is large or switching function value indicates potential overshoot risk, damping is increased to suppress oscillations. When deviation is near zero or overshoot risk is low, damping is reduced or eliminated to maximize response speed. This dynamic approach resolves the contradiction between stability and speed.
Solution Approach 2:
The control process is segmented into different phases based on deviation magnitude and switching function values. In early control phases with large deviation, damping is applied to prevent overshoot. In later phases near target achievement, damping is reduced to improve response. This temporal segmentation allows both overshoot suppression and fast response at different control stages.
3Measurement precision
If the deviation between target driving amount and actual driving amount is near zero, then precise control is achieved, but response performance for next acceleration or deceleration may be compromised without damping reduction
Solution Approach 1:
When deviation is near zero, indicating precise control is achieved, the damping output is reduced to prepare for rapid response to next acceleration or deceleration commands. This dynamic adjustment maintains precision during steady state while enabling fast transient response when needed.
Solution Approach 2:
The control system performs preliminary action by reducing damping output when deviation is near zero, preparing the system for rapid response to upcoming acceleration or deceleration commands. This anticipatory adjustment ensures both precise current control and ready-for-action state for next maneuvers.
Data Source
AI summary
A driving amount controller is provided for a vehicle. An ECU on the vehicle reduces a damping output Udamp when the deviation e between the target opening DTHR of the throttle valve and the actual opening DTH is near zero or when a switching function value σ is near zero. This makes it possible to reduce the damping output Udamp immediately after the start of, or immediately before the end of, the control of the opening of the throttle valve when the deviation e or the switching function value σ is near zero, and to realize a high response performance as to the control of the actual opening DTH of the throttle valve.