Balancer control device for multiple-cylinder four-cycle engine
First Claim
1. In a multiple-cylinder four-cycle engine which can be operated in two-cylinder operation in which two cylinders are operated so that the power stroke of one cylinder occurs with a crank angle phase difference of 360°
- with respect to the power stroke of the other cylinder,a balancer control device comprising a balancer which is driven during the two-cylinder operation of the engine to generate a primary vibration generating moment which reduces the primary vibration generating moment imparted to the engine structure due to explosion during the two-cylinder operation, an engine load detecting means for detecting engine load, an engine rpm detecting means for detecting the engine speed and a balancer changing means which changes the primary vibration generating moment of the balancer according to the operating condition of the engine so that the primary vibration generating moment of the balancer approximates the primary vibration generating moment of the engine structure due to explosion thereby suppressing the primary vibration generating moment of the engine structure over the entire operating range during the two-cylinder operation.
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Accused Products
Abstract
A multiple-displacement engine which can be operated either in a full-displacement operation in which all the cylinders are operative or a two-cylinder operation in which only two of the cylinders are operative is provided with a balancer control device. The balancer control device comprises a balancer which is driven at the same rpm as the engine output shaft during the two-cylinder operation and reduces the primary vibration generating moment imparted to the engine structure due to explosion, an engine load sensor for detecting engine load, an engine rpm sensor for detecting the engine speed and a balancer changing mechanism which changes the vibration generating moment of the balancer according to the operating condition of the engine so that the vibration generating moment of the balancer approximates the primary component of the vibration generating moment of the engine structure due to explosion thereby suppressing the primary vibration generating moment of the engine structure over the entire operating range during two-cylinder operation.
29 Citations
16 Claims
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1. In a multiple-cylinder four-cycle engine which can be operated in two-cylinder operation in which two cylinders are operated so that the power stroke of one cylinder occurs with a crank angle phase difference of 360°
- with respect to the power stroke of the other cylinder,
a balancer control device comprising a balancer which is driven during the two-cylinder operation of the engine to generate a primary vibration generating moment which reduces the primary vibration generating moment imparted to the engine structure due to explosion during the two-cylinder operation, an engine load detecting means for detecting engine load, an engine rpm detecting means for detecting the engine speed and a balancer changing means which changes the primary vibration generating moment of the balancer according to the operating condition of the engine so that the primary vibration generating moment of the balancer approximates the primary vibration generating moment of the engine structure due to explosion thereby suppressing the primary vibration generating moment of the engine structure over the entire operating range during the two-cylinder operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- with respect to the power stroke of the other cylinder,
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12. A balancer mechanism for an engine comprising a balancer which is supported for rotation about a rotational axis in parallel to the output shaft of the engine and has a center of mass at a position deviated from the rotational axis, the balancer comprising at least one balancer piece having a center of mass at a position deviated from the rotational axis of the balancer;
- means for rotating the balancer at a speed having a predetermined ratio to the rotational speed of the output shaft; and
a changing means for changing the distance between the rotational axis of the balancer and the center of mass of the overall balancer by rotating the balancer piece about the rotational axis of the balancer according to the operating condition of the engine. - View Dependent Claims (13, 14, 15, 16)
- means for rotating the balancer at a speed having a predetermined ratio to the rotational speed of the output shaft; and
Specification