Electronic Throttle Control with Dynamic Gain Overshooting
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Solution Overview
Problem
Existing electronic control throttle systems in leisure vehicles have low responsiveness of the throttle valve to quick operations of the throttle operation device, leading to undesirable engine speed fluctuations and potential mechanical impacts due to the inhibition of overshooting, which affects the vehicle's traveling capability.
Innovation Solution
The electronic control throttle system is configured to allow a controlled overshooting region beyond the fully open position by setting a large gain for the throttle valve controller, accompanied by a mechanical stopper to prevent excessive opening, thereby improving responsiveness and minimizing air flow fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a small proportional gain is set to inhibit overshooting of the throttle valve, then the convergence property in fully open position is improved, but the responsiveness of the throttle valve to quick operation of the throttle operation device becomes low
Solution Approach 1:
The patent applies dynamics by making the gain variable rather than fixed. The gain is dynamically adjusted based on the throttle valve opening degree: a large gain is used when the opening degree is below a threshold to improve responsiveness, and a small gain is used when the opening degree exceeds the threshold to ensure proper convergence and prevent excessive overshooting. This dynamic adjustment resolves the contradiction between responsiveness and convergence property.
2Reliability
If a mechanical stopper is mounted at the fully open position to define the maximum opening degree, then the convergence property is improved, but an impact is applied to the motor of the actuator, gear system, and mechanical stopper
Solution Approach 1:
The patent applies beforehand cushioning by using control gain adjustment to prevent the throttle valve from excessively overshooting the fully open position. By switching to a small gain when the opening degree exceeds the threshold, the system cushions against excessive mechanical impact before it occurs, protecting the motor, gear system, and stopper from damage while still achieving proper convergence.
3Speed
If the throttle valve is quickly moved to the fully open position to rapidly increase engine speed, then the responsiveness is improved, but the throttle valve cannot be moved at the desired speed due to control limitations
Solution Approach 1:
The patent applies preliminary action by pre-setting a large gain value that is activated when the throttle valve opening degree is below a threshold. This large gain enables the throttle valve to quickly respond to accelerator grip operations and rapidly move toward the fully open position, achieving fast engine speed increase without waiting for the valve to approach the threshold region first.
Data Source
AI summary
A leisure vehicle comprising an electronic control throttle system of an engine in which an actuator drives a throttle valve in response to an operation signal according to an operation amount of a throttle operation device, the electronic control throttle system including a throttle valve controller configured to send a control signal to the actuator to drive the throttle valve. The throttle valve controller is configured to give a gain to compensate for a deviation between a target opening degree of the throttle valve that is set based on the operation amount of the throttle operation device and an actual opening degree of the throttle valve which is a detected opening degree of the throttle valve. The throttle valve controller is configured to set the gain that causes the throttle valve to enter an overshooting region that exceeds a fully open position in a movement range of the throttle valve.