Fuel injection controller
AssigneeDenso Corporation
InventorKei Sanada
Life of this patent
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Abstract
A fuel injection controller includes a discharge switch that turns ON/OFF energization of a first energization path from a boost power source of a second booster circuit when a second control IC energizes a second solenoid, a first detection element that detects a value that depends on an energization state of the discharge switch, a constant current switch that turns ON/OFF energization of a second energization path from a power source voltage that outputs a lower voltage than a boost power source voltage when the second control IC energizes the second solenoid, a second element that detects a value that depends on an energization state of the constant current switch, and an energization path controller that switches energization to the second solenoid.
Claims6
A fuel injection controller for controlling injection of fuel from a common rail where fuel is accumulated to an internal combustion engine using fuel injectors, the fuel injectors each including a first solenoid, a first valve, a second solenoid, and a second valve, the fuel injection controller comprising:
- a first controller configured to control a fuel injection timing by driving the first valve by energizing the first solenoid during a normal injection control;
- a second controller configured to control a fuel injection rate by driving the second valve by energizing the second solenoid during the normal injection control;
- a first switch configured to turn ON/OFF energization of a first energization path from a boost power source of a booster circuit to the second solenoid when the second controller energizes the second solenoid;
- a first detector configured to detect an electric current value that depends on an energization state of the first switch;
- a second switch configured to turn ON/OFF energization of a second energization path from a battery power source that outputs a voltage lower than the boost power source to the second solenoid when the second controller energizes the second solenoid;
- a second detector configured to detect a value that depends on an energization state of the second switch;
- and
- an energization path controller configured to energize the second solenoid by switching to either of the first energization path or the second energization path based on detection results of the first detector and the second detector.
Dependencies are inferred from the claim text.