Patent ID: 6971969
Filing Date: 2005-12-06
Classification: B60K,B60W,F02D,Y10T

Abstract:
1. A transmission state determination method of a power transmission device for an internal combustion engine driven vehicle for determining whether said power transmission device is in a state of cutting power transmission or a state of transmitting power, said vehicle comprising: an internal combustion engine incorporated in a vehicle body having drive wheels; an AC generator incorporated in said vehicle body and driven by said internal combustion engine; mode selection means for selecting a control mode of said internal combustion engine between a control mode for driving vehicle and a control mode for generating electric power; and a generation control unit having rotational speed control means for generating electric power for controlling an intake air amount of said internal combustion engine so as to rotate said internal combustion engine at a rotational speed required for generating predetermined power from said generator when the control mode for generating electric power is selected by said mode selection means, wherein said power transmission device has a transmission with a gear position for cutting power transmission and an automatic clutch mechanism and is provided between a crankshaft of said internal combustion engine and said drive wheels, and a displacement sensor that can detect movement of said vehicle body is provided, said method comprises steps of; gradually increasing the intake air amount of said internal combustion engine while a rotational speed of said internal combustion engine is monitored when said control mode for generating electric power is selected, and determining that said power transmission device is in the state of transmitting power when said displacement sensor detects movement of said vehicle body in the step of gradually increasing said intake air amount, and that said power transmission device is in the state of cutting power transmission when said displacement sensor does not detect movement of said vehicle body before the rotational speed of said internal combustion engine exceeds a preset reference rotational speed in the step of gradually increasing said intake air amount.