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US 7,744,503 B2Granted
Enigne-driven work machine
AssigneeHonda Motor Co., Ltd.
InventorsHiroshi Kobayashi, Masayuki Sasaoka, Toshio Inoue, Kenzo Shimada, Yoshinori Maekawa
Life of this patent
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Abstract
An engine-driven work machine having a target engine speed selection unit and a control unit. The target engine speed selection unit selects and specifies an arbitrary target engine speed from among a plurality of target engine speeds that is set in stepwise fashion. The control unit electrically controls the opening and closing of a throttle valve so that the actual engine speed conforms to the specified target engine speed.
Claims19
An engine-driven work machine for driving an implement by an engine, comprising:
- a target engine speed selection unit for selecting and specifying an arbitrary target engine speed from among a plurality of target engine speeds that are set in a stepwise fashion;
- and
- a control unit for electrically controlling opening and closing of a throttle valve of the engine so as to cause an actual engine speed of the engine to conform to the target engine speed specified by the target engine speed selection unit;
- wherein the target engine speed selection unit is configured to be manually manipulated by an operator of the engine driven working machine for selecting and specifying the arbitrary target engine speed;
- and
- wherein the plurality of target engine speeds comprises two target engine speeds that include:
- a medium target engine speed at which the engine is substantially capable of generating a maximum torque;
- and
- a high target engine speed which is higher than the medium target engine speed and at which the engine is substantially capable of generating a maximum output.
6 more elements
An engine-driven work machine for driving an implement by an engine, comprising:
- a target engine speed selection unit for selecting and specifying an arbitrary target engine speed from among a plurality of target engine speeds that are set in a stepwise fashion;
- a control unit for electrically controlling opening and closing of a throttle valve of the engine so as to cause an actual engine speed of the engine to conform to the target engine speed specified by the target engine speed selection unit;
- a clutch for disengaging and engaging an output that is transmitted from the engine to the implement;
- a work clutch operating unit for operating the clutch;
- and
- a work clutch operation detection sensor for detecting that the clutch has been placed in the engaging position by the work clutch operating unit;
- wherein the target engine speed selection unit is configured to be manually manipulated by an operator of the engine driven working machine for selecting and specifying the arbitrary target engine speed;
- wherein the work clutch operating unit is configured to be manually manipulated by the operator of the engine driven working machine for operating the clutch;
- and
- wherein the control unit executes control on the basis of the specified target engine speed only when the work clutch operation detection sensor detects that the clutch has been placed in the engaging position.
7 more elements
An engine-driven work machine for driving an implement by an engine, comprising:
- a target engine speed selection unit for selecting and specifying an arbitrary target engine speed from among a plurality of target engine speeds that are set in a stepwise fashion;
- a control unit for electrically controlling opening and closing of a throttle valve of the engine so as to cause an actual engine speed of the engine to conform to the target engine speed specified by the target engine speed selection unit;
- and
- a target engine speed change operation unit for issuing a temporary change command on the basis of a human operation;
- wherein the target engine speed selection unit is configured to be manually manipulated by an operator of the engine driven working machine for selecting and specifying the arbitrary target engine speed;
- and
- wherein the control unit temporarily changes the specified target engine speed to a different target engine speed according to the temporary change command only when a condition wherein the engine-driven work machine is operating is satisfied.
4 more elements
An engine-driven work machine for driving an implement by an engine, comprising:
- a target engine speed selection unit for selecting and specifying an arbitrary target engine speed from among a plurality of target engine speeds that are set in a stepwise fashion;
- a control unit for electrically controlling opening and closing of a throttle valve of the engine so as to cause an actual engine speed of the engine to conform to the target engine speed specified by the target engine speed selection unit;
- a machine body which has a travel unit and on which the engine is mounted;
- left and right handlebars that extend rearward from the machine body;
- and
- a grip portion that extends between the rear ends of the left and right handlebars;
- wherein the target engine speed selection unit is configured to be manually manipulated by an operator of the engine driven working machine for selecting and specifying the arbitrary target engine speed;
- wherein the grip portion comprises left and right grip leg portions that extend upward from rear ends of the left and right handlebars;
- and
- a grip bar that extends between upper ends of the left and right grip leg portions, and the target engine speed selection unit is provided at a rear end portion of one of the left and right handlebars.
7 more elements
An engine-driven work machine for driving an implement by an engine, comprising:
- a target engine speed selection unit for selecting and specifying an arbitrary target engine speed from among a plurality of target engine speeds that are set in a stepwise fashion;
- a control unit for electrically controlling opening and closing of a throttle valve of the engine so as to cause an actual engine speed of the engine to conform to the target engine speed specified by the target engine speed selection unit;
- a machine body which has a travel unit and on which the engine is mounted;
- a handle extending to the rear from the machine body;
- a shift lever provided with the handle and used to adjust a travel speed of the travel unit;
- and
- a linkage mechanism for linking the shift lever to operation of the target engine speed selection unit;
- wherein the target engine speed selection unit is configured to be manually manipulated by an operator of the engine driven working machine for selecting and specifying the arbitrary target engine speed.
5 more elements
Dependencies are inferred from the claim text.