Engine choke actuation system
AssigneeSanshin Kogyo Kabushiko Kaisha
InventorAkihiko Hoshiba
Life of this patent
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Abstract
An engine choke actuation system controls both the opening degree of the choke and throttle valves of a plurality of charge formers during all phases of engine warmup. The engine choke actuation system includes a first device which acts to close the choke valve at the time of engine starting. A second device restricts a degree of closure of the choke valve by the first device depending upon the temperature of the engine at the time of engine starting. The second device also controls the opening degree of the choke valves after engine starting, increasing the opening degree of the choke valve with increasing engine temperature. In addition, the second device controls the fast idle angle of the throttle valves during engine warmup, decreasing the fast idle angle of the throttle valves as the engine temperature increases.
Claims34
An engine choke actuation system for use with at least two charge formers, each charger former having a choke valve operated by a choke shaft, said choke shaft moving said choke valve through a range of opening degrees between a closed position and a full open position, said engine choke actuation system comprising a first device acting to close said choke valves at the time of engine starting, and a second device which restricts the degree of closure of the choke valves by the first device depending upon the temperature at the time of engine starting, and which controls the opening degree of choke valves after engine starting, said second device comprising an actuator including a linear plunger which extends from a body of said actuator and moves relative to said body depending upon the temperature of said actuator, and a positive temperature coefficient device which heats said actuator body.
An engine choke actuation system for use with at least one charge former having a choke valve operated by a choke shaft, said choke shaft moving said choke valve through a range of opening degrees between a closed position and a full open position, said engine choke actuation system comprising a first device acting to close said choke valve at the time of engine starting, and a second device which restricts the degree of closure of the choke valve by the first device depending upon the temperature at the time of engine starting, and which controls the opening degree of the choke valve after engine starting such that the opening degree of said choke valve increases as the temperature increases said second device comprises an actuator operating a movable cam member which rotates relative to a fixed member of said second device, said cam member having a first cam surface and a second cam surface and said fixed member having a guide slot formed in part by an engagement edge.
An engine choke actuation system for use with at least two charge formers, each charge former having a choke valve operated by a choke shaft, said choke shaft moving said choke valve through a range of opening degrees between a closed position and a full open position, each charge former also including a throttle valve operated by a throttle shaft, said throttle shaft moving said throttle valve through a range of opening degrees, said engine choke actuation system comprising a first device acting to close said choke valves at the time of engine starting, a second device which restricts the degree of closure of the choke valves by the first device depending upon the temperature at the time of engine starting, and which controls the opening degree of choke valves after engine starting, said second device comprising an actuator including a positive temperature coefficient device, said second device of said choke actuation system being coupled to said throttle shafts so as to control the opening degree of said throttle valves during engine warmup, and a throttle control linkage which couples said actuator of said second device to said throttle shaft such that said actuator operates said throttle shaft so as to decrease the opening degree of the throttle valve as temperature increases, said throttle control linkage comprising a linkage rod which interconnects a cam member of said second device, which is operated by said actuator, to a rotatable linkage member of said throttle control linkage, said rotatable linkage member being connected to a throttle lever which is coupled to the throttle shaft.
An engine choke actuation system for use with at least one charge former having a choke valve operated by a choke shaft, said choke shaft moving said choke valve through a range of opening degrees between a closed position and a full open position, said engine choke actuation system comprising a choke lever attached to said choke valve shaft, a first device coupled to said choke lever so as to close said choke valve at the time of engine starting, and a second device coupled to said choke lever separately from said first device so as to restrict the degree of closure of the choke valve by the first device depending upon the temperature at the time of engine starting, and said second device also acting upon said choke lever to open the choke valve after starting the engine.
Dependencies are inferred from the claim text.