Vibration suppression system for diesel engine
AssigneeNissan Motor Co., Ltd.
InventorsYoshimasa Hayashi, Kiyoshi Shimada
Life of this patent
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Abstract
A vibration suppression system for a diesel engine comprises a first device for decreasing the amount of intake air to be inducted into the engine when operated. A second device is provided to heat the intake air when operated. Additionally, a third device is provided to detect a low engine speed and low engine load operating range, and to produce a signal in response thereto. The first and second devices are operated in response to the signal from the third device, thereby avoiding irregular combustion and misfire while suppressing engine speed fluctuation and torque fluctuation.
Claims14
A system for suppressing vibration of a diesel engine, comprising:
- means operable for decreasing the amount of intake air inducted into the engine;
- means operable for heating the intake air;
- means for detecting a low engine speed and a low engine load operating range of the engine and for producing an output signal when both said low engine speed and low engine load operating range are detected;
- and
- means for simultaneously operating said intake air amount decreasing means and said intake air heating means in response to said output signal from said detecting means.
A system for suppressing vibration of a diesel engine, comprising:
- means operable for decreasing the amount of intake air inducted into the engine, said intake air decreasing means comprising:
- means defining an intake air passageway leading to a combustion chamber of the engine;
- an intake air throttle valve movably disposed within said intake passageway;
- a throttle valve actuator comprising a solenoid actuator constructed and arranged to fully close said throttle valve when supplied with electric current for fully closing said throttle valve in response to said output signal from said detecting means;
- and
- means defining an auxiliary air passage communicating with said intake air passageway and bypassing said throttle valve;
- means operable for heating the intake air, said intake air heating means comprising an electric heater for generating heat when supplied with electric current;
- means for detecting a low engine speed and a low engine load operating range of the engine and for producing an output signal when said low engine speed and low engine load operating range are detected, said detecting means comprising an engine speed responsive means for sensing an engine operating parameter corresponding to engine speed, and an engine load responsive means for sensing an engine operating parameter corresponding to engine load;
- means for operating said intake air amount decreasing means and said intake air heating means in response to said output signal from said detecting means;
- wherein said engine speed responsive means includes an oil pressure switch responsive to engine lubricating oil pressure, said oil pressure switch being electrically connected to said electric heater and said solenoid actuator and arranged to supply electric current to said electric heater and solenoid actuator when the engine lubricating oil pressure is between first and second levels.
Dependencies are inferred from the claim text.