Engine Control Device Fuel Pressure Management
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Solution Overview
Problem
Conventional engine control devices face challenges in ensuring timely and sufficient fuel injection at engine start, leading to delayed fuel injection, reduced startability, increased power consumption, and unburned gas exhaust due to battery voltage fluctuations and inefficient fuel pressure management.
Innovation Solution
An engine control device using a microprocessor to drive the fuel pump only for a set time at startup, ensuring stable fuel pressure before starting the starter motor, and performing the first fuel injection after pump completion, with additional microprocessor control for accurate fuel injection and generation output management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the starter motor is driven to start the engine, then the engine can be started, but the battery voltage significantly decreases causing delayed fuel injection
Solution Approach 1:
The fuel pump is driven for a predetermined time period before the starter motor is activated to pre-establish sufficient fuel pressure in the fuel supply system. This preliminary action ensures that when the starter motor is driven and battery voltage decreases, the fuel injection system is already prepared with adequate fuel pressure, preventing injection delays and ensuring reliable engine starting.
2Reliability
If the fuel pump is driven for a long time before engine start, then fuel pressure is sufficient, but power consumption increases
Solution Approach 1:
The control device adjusts the operating parameters of the fuel pump by specifying a predetermined time period for operation before engine start. This parameter optimization ensures that the fuel pump operates long enough to establish sufficient fuel pressure in the fuel rail, but not so long as to cause excessive power consumption. The predetermined time is calibrated to achieve the minimum necessary pressure with minimum energy expenditure.
3Loss of time
If the injector valve opens with delay due to low battery voltage, then the injection timing is delayed, but the fuel injection amount becomes insufficient
Solution Approach 1:
The fuel pump is operated in advance for a predetermined time period before the starter motor is driven, pre-building sufficient fuel pressure in the fuel supply system. This preliminary fuel pressurization ensures that even when the injector valve experiences opening delay due to reduced battery voltage during cranking, the fuel injection amount remains sufficient because the pressure differential driving fuel through the injector is already established.
Data Source
AI summary
An engine control device that controls, using a microprocessor, a fuel injection device including an injector and a fuel pump, and a starter motor that starts an engine, including: first fuel pump driving means for driving the fuel pump only during set time at power-on of the microprocessor; and first fuel injection control means for causing the injector to perform first fuel injection before driving of the starter motor when it is confirmed that the driving of the fuel pump by the first fuel pump driving means is completed and that a start command for commanding the start of the engine is given.