Oil pressure switch failure detection system for outboard motor
First Claim
1. A system for detecting failure of oil pressure switches which generate signals in response to a pressure of oil to be supplied to an internal combustion engine for an outboard motor for small boats, comprising:
- a first oil pressure switch which generates a signal indicating that the oil pressure is less than or equal to a first predetermined oil pressure;
a second oil pressure switch which generates a signal indicating that the oil pressure is less than or equal to a second predetermined oil pressure which is set higher than the first predetermined oil pressure;
switch signal discriminating means for discriminating whether the generated signals of the first and second oil pressure switches are equal to be expected signals expected under operating conditions of the engine; and
switch failure determining means for conducting a determination as to whether at least one of the first and second oil pressure switches fails based on a result of discrimination of the switch signal determining means.
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Accused Products
Abstract
An oil pressure switch failure detection system for an outboard motor, having a first oil pressure switch which generates an ON signal indicating that the oil pressure is less than or equal to a first predetermined oil pressure and a second oil pressure switch which generates an ON signal indicating that the oil pressure is less than or equal to a second predetermined oil pressure which is set higher than the first predetermined oil pressure. In the system, by discriminating whether the generated signals of the first and second oil pressure switches are equal to be expected signals expected under operating conditions of the engine, it is determined whether at least one of the first and second oil pressure switches fails. With this, it become possible to detect failure of the first and second oil pressure switches, accurately.
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Citations
30 Claims
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1. A system for detecting failure of oil pressure switches which generate signals in response to a pressure of oil to be supplied to an internal combustion engine for an outboard motor for small boats, comprising:
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a first oil pressure switch which generates a signal indicating that the oil pressure is less than or equal to a first predetermined oil pressure;
a second oil pressure switch which generates a signal indicating that the oil pressure is less than or equal to a second predetermined oil pressure which is set higher than the first predetermined oil pressure;
switch signal discriminating means for discriminating whether the generated signals of the first and second oil pressure switches are equal to be expected signals expected under operating conditions of the engine; and
switch failure determining means for conducting a determination as to whether at least one of the first and second oil pressure switches fails based on a result of discrimination of the switch signal determining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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16. A method of detecting failure of oil pressure switches which generate signals in response to a pressure of oil to be supplied to an internal combustion engine for an outboard motor for small boats, having a first oil pressure switch which generates a signal indicating that the oil pressure is less than or equal to a first predetermined oil pressure and a second oil pressure switch which generates a signal indicating that the oil pressure is less than or equal to a second predetermined oil pressure which is set higher than the first predetermined oil pressure, comprising the steps of:
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(a) discriminating whether the generated signals of the first and second oil pressure switches are equal to be expected signals expected under operating conditions of the engine; and
(b) conducting a determination as to whether at least one of the first and second oil pressure switches fails based on a result of the discrimination.
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Specification