Fuel Injection Control for Throttle Over-shoot Correction
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Solution Overview
Problem
Existing fuel injection control systems for internal combustion engines struggle to accurately judge acceleration and deceleration conditions due to over-shoots and under-shoots in throttle valve openings, leading to mismatched engine operation and riding experience.
Innovation Solution
A fuel injection control system that includes a throttle operation condition detector, throttle valve opening detector, and fuel injection quantity controller, which adjusts fuel injection quantities based on the operation condition of the throttle operator, accounting for over-shoots and under-shoots in throttle valve openings, and uses correction values to maintain appropriate fuel injection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the throttle valve opening is quickly adjusted to a fixed opening during acceleration, then the response speed is improved, but over-shoot and under-shoot occur in the real throttle valve opening relative to the target opening
Solution Approach 1:
The system performs preliminary action by detecting the operation condition of the throttle operator (throttle grip) in advance and using this information to predict and correct for upcoming over-shoot and under-shoot phenomena. The correction value is calculated based on the detected operation condition before the actual throttle valve movement occurs, allowing the fuel injection quantity to be pre-adjusted to compensate for the anticipated mechanical overshoot.
Solution Approach 2:
The system implements feedback by continuously monitoring the real throttle valve opening and comparing it with the target opening, then using this information along with the throttle operator condition to calculate a correction value. This feedback loop allows the system to dynamically adjust the fuel injection quantity correction based on the actual deviation between real and target throttle openings, ensuring accurate fuel injection even when mechanical overshoot occurs.
2Device complexity
If the fuel injection quantity is controlled based on the real throttle valve opening, then the control simplicity is improved, but the engine operation does not match the operator's throttle input due to over-shoot and under-shoot
Solution Approach 1:
The system introduces an intermediary element - the correction value calculation based on throttle operator condition - between the simple real throttle opening detection and the fuel injection control. This intermediary layer processes the throttle operator's intended action and translates it into a correction that compensates for mechanical overshoot, thereby maintaining the simplicity of detecting real throttle opening while improving the reliability of acceleration condition judgment and engine response.
3Stability of the object's composition
If the throttle device is maintained at a fixed opening, then the steady-state operation is improved, but the system incorrectly judges acceleration or deceleration conditions due to over-shoot and under-shoot
Solution Approach 1:
The system applies dynamics by making the fuel injection quantity correction dynamic rather than static. Even when the throttle opening is maintained at a fixed position, the correction value continuously changes based on the detected throttle operator condition and the calculated deviation between real and target openings. This dynamic adjustment allows the system to distinguish between actual acceleration conditions and transient overshoot effects, maintaining stable throttle operation while improving acceleration condition detection precision.
Data Source
AI summary
A fuel injection control system provided with a throttle by wire (TBW) system detecting an operation condition of a throttle grip and controlling, via an actuator, a throttle valve. The control system detects the throttle valve opening and controls an injector. An increased quantity correction value is determined based upon of an output of a throttle valve opening sensor and an operation condition of the throttle grip. When an acceleration condition of a vehicle is detected according to the output of the throttle valve opening sensor, an increased quantity correction of fuel is performed. The increased quantity correction value is brought to an attenuation condition in which the increased quantity correction value is gradually decreased, or a stop condition in which the increased quantity correction value is made to zero, when the throttle grip is not in drive in an opening direction, even though an acceleration condition is detected.