Oil pressure monitoring system for two- stroke engines
AssigneeBombardier Recreational Products Inc.
InventorsScott A. Koerner, Anteo Opipari
Life of this patent
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Abstract
The present invention provides a system and method to adjust the quantity of oil delivered to the cylinders of an internal combustion engine of an outboard motor. The system includes an oiling system to distribute oil throughout the internal combustion engine. The oiling system has a pressure sensor connected between an oil injector and the internal combustion engine to sense oil pressure and produce an oil pressure indicative signal to an electronic control unit (ECU). The ECU is configured to monitor the oil pressure indicative signal and modify a modulated oil injection signal delivered to the oil injector.
Claims31
An oil monitoring system for a two-stroke engine comprising:
- an oil system having an oil inlet, an oil outlet, and an electronic oil injector therebetween;
- a pressure sensor connected to the oil system downstream of the electronic oil injector and configured to detect oil pressure in a two-stroke engine and generate an oil pressure indicative signal;
- and
- an ECU in communication with the pressure sensor and the electronic oil injector, wherein the ECU is programmed to modify a duty cycle of the electronic oil injector upon the ECU receiving an oil pressure indicative signal indicating low oil pressure from the pressure sensor.
An outboard motor comprising:
- an internal combustion engine having an oiling system to distribute oil throughout the internal combustion engine;
- a water propulsion unit in operable association with the internal combustion engine to propel the outboard motor;
- at least one oil injector connected to the oiling system to cause oil delivery through the oiling system;
- a pressure sensor connected to the oiling system between the at least one oil injector and the internal combustion engine to sense oil pressure downstream of the at least one oil injector and produce an oil pressure indicative signal in response thereto;
- and
- an electronic control unit (ECU) connected to deliver a modulated signal to the at least one oil injector and connected to the pressure sensor to receive the oil pressure indicative signal, the ECU configured to monitor the oil pressure indicative signal and modify the modulated signal in response thereto to regulate oil delivery through the internal combustion engine.
A method of detecting a low oil pressure condition in a two-stroke engine, the method comprising the steps of:
- (A) detecting oil pressure in a two-stroke fuel injected engine;
- (B) determining if the detected oil pressure is within a given range for a given set of engine parameters, and if not;
- (C) causing oil to be delivered into the two-stroke engine with a prescribed pulse width;
- (D) determining if the oil was delivered and, if not, determining if a number of faults exceed a prescribed value;
- and
- (E) if the number of faults exceed the prescribed value, limiting engine operation, and if not, repeating steps (C)-(D).
An oil monitoring system for a two-stroke engine comprising:
- means for injecting oil into a two-stroke engine;
- means for detecting if an oil pressure is within a given range for a given set of engine parameters;
- and
- means for modifying the oil injected into the two-stroke engine to maintain the oil pressure within the range for the given set of engine parameters and if the oil pressure cannot be adjusted further, limiting engine operation.
Dependencies are inferred from the claim text.