Patent ID: 8081498
Filing Date: 2011-12-20
Classification: F02D

Abstract:
1. An internal combustion engine controller comprising: a booster coil connected to a battery to boost a voltage of the battery; a switch element connected to the booster coil to control the passage of current through the booster coil and an interruption of the current; a booster capacitor for accumulating electrical energy generated with an inductance of the booster coil at the time of the interruption of the passage of the current; and a booster control circuit for carrying out control in a constant boost switching cycle so as to pass the current through the booster coil and the switch element and then interrupt the current to charge the energy generated with the inductance of the booster coil into the booster capacitor; wherein the booster control circuit is configured to set a booster capacitor charge-ensuring time as a fixed time period in a second half of the boost switching cycle to ensure at least minimum time period for the booster capacitor-charging of the energy within the boost switching cycle, and to interrupt the current and charge the energy generated with the inductance of the booster coil into the booster capacitor whenever one of the following is satisfied i) the current reaches a preset switching stop threshold value; and ii) said booster capacitor charge-ensuring time has been reached.