Engine Injection Controller Transient Response Control
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Solution Overview
Problem
Conventional fuel injection systems in engines experience a delay in responding to acceleration operations due to the time lag between intake air pressure detection and fuel injection, limiting the engine's responsivity to acceleration instructions.
Innovation Solution
An injection controller that determines fuel injection quantities for each cylinder based on intake air pressure and rotation speed, and performs transient response control by applying the determined fuel injection quantity to all cylinders when an acceleration instruction is detected, thereby reducing the delay and enhancing engine responsivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fuel injection quantity is determined based on intake air pressure detected in one intake stroke for the next intake stroke, then fuel injection control precision is improved, but engine responsivity to acceleration operations deteriorates due to at least one-cycle delay
Solution Approach 1:
The injection controller determines the fuel injection quantity for the next intake stroke in advance based on the intake air pressure detected in the current intake stroke. By performing this determination preliminarily, the controller eliminates the one-cycle delay that occurs in conventional systems, allowing the engine to respond immediately to acceleration operations while maintaining precise fuel injection control.
2Measurement precision
If transient fuel injection is performed based on measured intake air pressure variation after subtracting fully-closed-state intake air pressure variation, then fuel injection accuracy is improved, but response time to acceleration operations increases due to cycle delay
Solution Approach 1:
The injection controller calculates the transient fuel injection quantity in advance by subtracting the fully-closed-state intake air pressure variation from the measured intake air pressure variation during the current intake stroke. This preliminary calculation ensures that the fuel injection quantity is ready for the next intake stroke without delay, maintaining both accuracy and fast response time.
3Measurement precision
If fuel injection quantity is determined for each cylinder individually based on its intake air pressure, then injection control precision is improved, but engine responsivity to instruction operations deteriorates due to sequential processing delay
Solution Approach 1:
When an instruction operation is detected, the injection controller merges the transient fuel injection quantity determined for one cylinder with the fuel injection quantities of other cylinders. By combining the fuel injection quantities across all cylinders simultaneously, the controller achieves both precise individual cylinder control and rapid overall engine response to acceleration operations.
Data Source
AI summary
An injection controller includes processor that determines a fuel injection quantity in each of cylinders of a multi-cylinder engine, and a memory. The processor acquires an intake air pressure of each of the cylinders, determines, for each of the cylinders, on the basis of the intake air pressure in one intake stroke, a fuel injection quantity for a next intake stroke in the cylinder, determines whether an instruction operation for making an instruction to increase or reduce a rotation speed of the engine has been performed on the basis of the intake air pressure in one of the cylinders, and performs transient response control to apply the fuel injection quantity for the next intake stroke in the one cylinder also to the fuel injection quantity in the next intake stroke in the cylinders other than the one cylinder when it is determined that the instruction operation has been performed.