Internal Combustion Engine Fuel Injection Control Device
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Solution Overview
Problem
Existing control devices for internal combustion engines face challenges in accurately controlling fuel injection quantity due to fuel pressure pulsation, which is influenced by engine load, temperature, and fuel characteristics, leading to instability in air-fuel ratios.
Innovation Solution
A control device that includes cylinder and port injection valves, a feed pump, high pressure pump, fuel pressure sensor, and a controller that calculates and adjusts the energization period of port injection valves based on detected fuel pressure, storing and averaging fuel pressure data to account for pulsation cycles, ensuring accurate fuel injection quantity control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the required injection quantity is corrected based only on the rotational speed of the internal combustion engine, then the control process is simple, but the fuel injection quantity cannot be accurately controlled due to fuel pressure pulsation influenced by load, temperature, and fuel characteristics
Solution Approach 1:
The system uses feedback by detecting actual fuel pressure during injection with a fuel pressure sensor and using this detected pressure value to calculate the energization period. This closed-loop feedback mechanism allows the controller to adjust the injection quantity based on real-time pressure conditions, accurately compensating for fuel pressure pulsation caused by load, temperature, and fuel characteristics while maintaining a relatively simple control structure.
2Measurement precision
If fuel pressure is detected during injection of the port injection valve and the energization period is calculated based on this fuel pressure, then the fuel injection quantity can be accurately controlled, but the process cannot be executed within the short fuel injection period
Solution Approach 1:
The system applies preliminary action by detecting the fuel pressure value during the injection period of one port injection valve and storing it in advance. This pre-detected pressure value is then used to calculate the energization period for the next port injection valve's injection event. By performing the pressure detection and calculation in advance for subsequent injections, the system ensures accurate fuel injection quantity control without requiring complex real-time calculations during the brief injection window.
3Stability of the object's composition
If a smoothing value of the fuel pressure is used to control the fuel injection quantity, then the control is stable, but the fuel pressure pulsation component cannot be reflected
Solution Approach 1:
The system applies periodic action by detecting fuel pressure values at regular intervals corresponding to the injection events of port injection valves and using these periodically sampled pressure values to calculate energization periods. This periodic sampling approach captures the fuel pressure pulsation components that occur at regular intervals during engine operation, allowing the control system to reflect and compensate for pressure variations while maintaining stable control through systematic measurement.
Data Source
AI summary
A controller of a control device of an internal combustion engine includes: a storage configured to store fuel pressure detected during injection of one port injection valve of port injection valves in association with another port injection valve, of the port injection valves, scheduled to inject fuel after one or two cycles of the fuel pressure pulsation elapsing from injection of the one port injection valve; and a calculator configured to calculate an energization period of the another port injection valve based on the stored fuel pressure.