Method and device for monitoring and/or determining motor oil quality
First Claim
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1. A method of determining motor oil quality, comprising the steps of:
- determining a viscosity of the motor oil during operation of an internal combustion engine;
determining and evaluating a change of the viscosity of the motor oil determined in the viscosity determining step as a function of a temperature and frictional torque of the engine; and
determining starter torque, the viscosity change determining and evaluating step including the substep of determining the frictional torque in accordance with the starter torque.
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Abstract
The present invention provides a method and device for determining the viscosity of motor oil in an internal combustion engine comprising: measuring frictional torque of the engine based on engine data, such as, the clutch switch signal which shows whether the clutch is engaged transmitting torque to the drive train; a generator load signal, a starter load signal, acceleration power consumption, and the like.
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Citations
9 Claims
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1. A method of determining motor oil quality, comprising the steps of:
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determining a viscosity of the motor oil during operation of an internal combustion engine;
determining and evaluating a change of the viscosity of the motor oil determined in the viscosity determining step as a function of a temperature and frictional torque of the engine; and
determining starter torque, the viscosity change determining and evaluating step including the substep of determining the frictional torque in accordance with the starter torque. - View Dependent Claims (2, 3)
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4. A method of determining motor oil quality, comprising the steps of:
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determining a viscosity of the motor oil during operation of an internal combustion engine;
determining and evaluating a change of the viscosity of the motor oil determined in the viscosity determining step as a function of a temperature and frictional torque of the engine; and
determining whether the change of the viscosity is outside a range of −
15% to +50% of a predefined viscosity value at a same temperature, the viscosity change determining and evaluating step being performed in accordance with the step of determining whether the change of the viscosity is outside the range of −
15% to +50% of the predefined viscosity value at the same temperature.
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5. A method of determining viscosity of motor oil of an internal combustion engine, comprising the steps of:
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determining an engine frictional torque; and
determining the viscosity of the motor oil in accordance with the engine frictional torque;
wherein the engine frictional torque is determined in the engine frictional torque determining step in accordance with engine data available in an engine controller; and
wherein the engine data includes;
an engine torque generated in accordance with at least one of an injection time and a throttle valve position;
a signal that indicates whether a torque is transmitted to a drive train; and
at least one signal relating to an operating condition of at least one auxiliary unit driven by the engine.
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6. A method of determining viscosity of motor oil of an internal combustion engine, comprising the steps of:
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determining an engine frictional torque; and
determining the viscosity of the motor oil in accordance with the engine frictional torque;
wherein the engine frictional torque is determined in the engine frictional torque determining step in accordance with engine data available in an engine controller; and
wherein the internal combustion engine is a diesel engine, the engine data including;
a signal that indicates whether a torque is transmitted to a drive train;
a load signal of a generator as a measure of an electric power generated by a generator;
an engine rpm;
an injected amount of fuel;
an engine temperature; and
an ambient temperature.
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7. A method of determining viscosity of motor oil of an internal combustion engine, comprising the steps of:
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determining an engine frictional torque;
determining the viscosity of the motor oil in accordance with the engine frictional torque; and
determining a start torque and a consumed engine acceleration power, the engine frictional torque being determined in the engine frictional torque determining step in accordance with the start torque and the consumed engine acceleration power. - View Dependent Claims (8, 9)
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Specification