Patent ID: 7118097

Claim:
A device for controlling a choke valve of a carburetor annexed to an engine, comprising: choke closed state hold means for holding, in a closing position corresponding to the completely closed position of the choke valve; a choke lever connected to the choke valve and urged by a spring in a direction for opening the choke valve, when the choke lever is turned to the closing position, the choke closed state hold means releasing the choke lever from the held state by a throttle operation thereafter performed on the carburetor; a control lever which turns between a low-temperature position and a high-temperature position while being axially supported on a fixed structural member, and which at its low-temperature position limits the position of the choke lever released from the choke closed state hold means to an intermediate position corresponding to a half opened position of the choke valve and at its high-temperature position limits the position of the choke lever to an opening position corresponding to a full open position of the choke; a first control spring which urges the control lever toward the low-temperature position; and a second control spring which is made of a shape memory alloy, and which under the influence of the engine temperature enters a shape restored state when the engine temperature reaches a predetermined high temperature to exert a spring force for turning the control lever to the high-temperature position against the urging force of the first control spring.