Patent ID: 8005599

Claim:
A lubricating oil supply control device for a transmission of a vehicle that is driven by an output of an engine transmitted to the transmission, the lubricating oil supply control device comprising: an engine controller for outputting a control signal which indicates a fuel injection quantity to control the engine; a transmission controller for outputting a control signal which indicates a speed stage currently selected to control the transmission; a lubricating oil supplying oil passage for guiding a lubricating oil from a torque converter to the transmission after the lubricating oil has been discharged from a hydraulic pump; a bypass oil passage for guiding a portion of the lubricating oil from the lubricating oil supplying oil passage to a tank such that the portion of the lubricating oil bypasses the transmission; a relief valve disposed in the bypass oil passage for permitting the portion of the lubricating oil to flow to the tank through the bypass oil passage, the relief valve being operated in accordance with a control signal; a restrictor at least partially restricting a flow of the portion of the lubricating oil controlled by the relief valve into the tank; and a lubricating oil supply controller which receives the control signal output from the engine controller and the control signal output from the transmission as control information, wherein the lubricating controller generates and outputs a control signal for operating the relief valve in accordance with the control information received from the engine controller and the transmission controller when the control information indicates that the fuel injection quantity of the engine is not more than a prescribed threshold value, or that the speed stage currently selected by the transmission is a set light load speed stage, or that the fuel injection quantity of the engine is not more than a prescribed threshold value and the speed stage currently selected by the transmission is the set light load speed stage.