Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Fuel injector control system for cylinder injection type internal combustion engine
 A fuel injector control system for a cylinder injection type internal combustion engine capable of suppressing a concentrative heat generation at a voltage generating circuit, which system includes a sensor means (1) for detecting operation state of the internal combustion engine to thereby output engine operation state information (D), a control parameter arithmetic means (2) for determining arithmetically a fuel supply quantity and a fuel injection timing for the engine on the basis of the engine operation state information (D), a plurality of cylinder injection type fuel injectors (61 to 66) for injecting fuel directly and individually to cylinders (#1 to #6) of the engine, a driving circuit (5) for driving electrically the fuel injectors (61 to 66) in response to control signals (C1, . . . , C6) outputted from the control parameter arithmetic means (2), and a voltage generating circuit (4) for supplying fuel injection signals (J1, . . . , J6) to the fuel injectors (61, . . . , 66) through the medium of the driving circuit (5), wherein the voltage generating circuit (4) includes a high-voltage generating means (4H1, 4H2) for supplying overexcitation signals (E1, . . . , E6) in an initial phase of the fuel injection signal (J1, . . . , J6), and a low-voltage generating means (4L1, 4L2) for holding the fuel injection signal (J1, . . . , J6) to be constant at a predetermined current level. The high-voltage generating means (4H1, 4H2) and the low-voltage generating means (4L1, 4L2) are provided in parallel in a number corresponding to that of groups (#1, #3, #5; #2, #4, #6) of the cylinders (#1, . . . , #6) to be controlled groupwise. 
Mitsubishi Denki Kabushiki Kaisha
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Tetsushi
Watanabe