Patent ID: 9018794
Filing Date: 2015-04-28
Classification: B60K,B60W,B60Y,F02N,Y02T

Abstract:
1. An electric power controller for a vehicle with stop-start system in which an engine is controlled to an idle-stop state according to an operation condition of the vehicle and to a re-starting state after the idle-stop state, the electric power controller comprising: a motor/generator which is configured to drive the engine at the re-starting state of the engine and is driven by the engine at a self-running state after the engine has been re-started to generate electric energy; a power capacitor which is configured to be charged with the electric energy generated by the motor/generator and supplies the electric energy to the motor/generator at the re-starting state of the engine; power controller comprising a DC/DC converter, the power controller being connected between a vehicle-mounted battery for supplying electric power to an electric load and the power capacitor, the power controller performing control so that the vehicle-mounted battery is charged with the electric energy accumulated in the power capacitor; a microcomputer comprising an idle-stop controller which controls the engine in the idle-stop state; battery sensor for measuring a capacitor voltage of the power capacitor; and a capacitor sensor for measuring a capacity voltage of the power capacitor, wherein the power controller is configured to perform control in the idle-stop state so that the transfer of the electric energy from the power capacitor to the vehicle-mounted battery is stopped in a case where the state of charge of the vehicle-mounted battery is equal to or greater than a first predetermined value and the capacitor voltage of the power capacitor is equal to or greater than a second predetermined value, and the transfer of the electric energy from the power capacitor to the vehicle-mounted battery is executed when the state of charge of the vehicle-mounted battery has dropped to a smaller value than the first predetermined value in a state where the capacitor voltage of the power capacitor is equal to or greater than the second predetermined value.