Engine Control Using Crankshaft Kinetic Energy to Restore Fuel Pressure
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Solution Overview
Problem
Conventional engine systems require significant energy to pump fuel to the common rail during engine restart after a fuel cut, increasing the work required for restarting the engine.
Innovation Solution
An engine control device and method that utilizes the rotational kinetic energy of the crankshaft after fuel cut to pump fuel to the common rail, using the injection control part to stop fuel injection and the pumping control part to manage fuel pumping from when injection stops until the crankshaft rotation ceases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fuel is pumped to reach desired fuel pressure in the common rail during engine restart, then fuel pressure is restored for engine operation, but significant energy is consumed for pumping fuel
Solution Approach 1:
The patent applies preliminary action by stopping fuel injection before the engine stop condition is fully satisfied, allowing fuel to remain in the common rail at high pressure during the engine stop period. This preliminary fuel delivery ensures that when the engine restarts, the fuel pressure is already restored or close to restored, eliminating the need for intensive fuel pumping during restart and thereby reducing energy consumption while maintaining fuel pressure reliability
2Reliability
If fuel injection is stopped early before engine stop condition is satisfied, then fuel pressure is maintained in the common rail, but the timing of fuel cut is advanced
Solution Approach 1:
The control device performs the fuel cut action preliminarily, before the engine stop condition is fully satisfied. By advancing the fuel cut timing, the system maintains high fuel pressure in the common rail during the engine stop period, ensuring immediate fuel availability upon restart without compromising the engine stop function
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces the amount of work needed for fuel pumping during engine restart by utilizing the rotational kinetic energy of the crankshaft, maintaining high fuel pressure in the common rail and optimizing energy use.
Implementation Method 1
a pumping control part that causes the fuel to be pumped from a fuel pump that is driven by rotational motion of the crankshaft occurring from when the injection of the fuel has been stopped to when rotation of the crankshaft stops
Implementation Method 2
causes the fuel to be pumped from a fuel pump that is driven by rotational motion of the crankshaft occurring from when the injection of the fuel has been stopped to when rotation of the crankshaft stops
Data Source
AI summary
The engine control device includes: an injection control part that receives an instruction to stop an engine and stops injection of fuel from an injector into the engine; and a pumping control part that causes fuel to be pumped from a fuel pump that is driven by rotational motion of a crankshaft occurring from when injection of fuel has been stopped to when the rotation of the crankshaft stops, to a common rail that supplies fuel to the injector.