Pulse start method and pulse start device for an internal combustion engine
First Claim
1. A pulse starting method for an internal combustion engine having a crankshaft, said method comprising the steps of:
- a) during a wind-up phase, accelerating a flywheel mass in a rotary driven fashion in order to rotate the flywheel mass;
b) then during a coupling phase following the wind-up phase, coupling the rotating flywheel mass to the crankshaft of the engine, in order transmit torque to the crankshaft for starting the engine;
c) during at least one of the wind-up phase (15) and the coupling phase (21, 22), evaluating a rotational speed progression (n(t)) of the flywheel mass (3) to obtain evaluation results;
d) deducing whether a successful start of the engine is possible from the evaluation results obtained in step c); and
e) if said successful start is not expected, the engine is brought into an operating position favorable for a subsequent starting attempt by means of the crankshaft.
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Accused Products
Abstract
The invention relates to a pulse starting method for an internal combustion engine in which, during a wind-up phase, a flywheel mass is accelerated in a rotary driven fashion and then during a coupling phase, the rotating flywheel mass is coupled to a rotatably supported shaft of the engine, preferably the crankshaft, in order transmit torque, which is distinguished by the fact that during the wind-up phase (15) and/or the coupling phase (21, 22), the rotational speed progression of the flywheel mass (3) is evaluated, that based on this evaluation, a deduction is made as to whether a successful start of the engine (1) is possible, and that if a successful start is not expected, the shaft (2) is used to bring the engine (1) into an operating position that is favorable for a subsequent second starting attempt.
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Citations
15 Claims
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1. A pulse starting method for an internal combustion engine having a crankshaft, said method comprising the steps of:
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a) during a wind-up phase, accelerating a flywheel mass in a rotary driven fashion in order to rotate the flywheel mass;
b) then during a coupling phase following the wind-up phase, coupling the rotating flywheel mass to the crankshaft of the engine, in order transmit torque to the crankshaft for starting the engine;
c) during at least one of the wind-up phase (15) and the coupling phase (21, 22), evaluating a rotational speed progression (n(t)) of the flywheel mass (3) to obtain evaluation results;
d) deducing whether a successful start of the engine is possible from the evaluation results obtained in step c); and
e) if said successful start is not expected, the engine is brought into an operating position favorable for a subsequent starting attempt by means of the crankshaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A pulse starter for an internal combustion engine (1) having a rotatably supported crankshaft (2) and a rotatably supported fly-wheel mass (3), the pulse starter (10) comprising
an electrical starter (5) for rotatably driving said flywheel mass (3); -
a starter control unit (9) for controlling said starter (5);
a pulse starting clutch (4) for engaging said flywheel mass (3) with said crankshaft (2) to rotate said crankshaft in order to attempt to start said engine;
a rotation speed sensor (12) for measuring a rotation speed of said flywheel mass (3), and evaluating means (11) for evaluating said rotational speed (n) of said flywheel mass (3) at individual times over time (t) to determine whether or not a successful start of said engine (1) is possible during successive starting attempts;
wherein said evaluating means includes means for evaluating at least one of a measured rotation speed of said flywheel mass and a rotational speed progression of the flywheel mass (3), during at least one of a wind-up phase (15) in which said flywheel mass (3) is put into rotation, but not coupled to said crankshaft, and a coupling phase (21, 22) in which said flywheel mass is coupled with said crankshaft to start said engine in order to obtain evaluation results. - View Dependent Claims (15)
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Specification