High Pressure Oil Limit Based on Fuel Level To Protect Fuel Injectors
First Claim
Patent Images
1. An internal combustion engine comprising:
- a control system;
a fuel system that draws liquid fuel from a fuel tank to charge fuel injectors that when actuated by the control system force fuel charges into engine combustion chambers using hydraulic fluid at injection control pressure (ICP); and
the control system comprising a processor for executing an ICP control strategy, wherein the strategy comprises processing a first fuel value indicative of the quantity of fuel presently in the tank and a second fuel value representing a quantity of fuel in the tank at which a maximum ICP limit set by the ICP control strategy should be changed, and when the result of the processing discloses that the second fuel value is less than the first fuel value, execution of the ICP control strategy reduces the maximum ICP limit from a greater value to a lesser value.
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Abstract
A first fuel value (FL_Signal) indicative of the quantity of fuel presently in a fuel tank (34) and a second fuel value (FL_LOW_THLD) representing a quantity of fuel in the tank at which a maximum Injection Control Pressure (ICP) limit should be changed are processed by a processor (22). When the result of the processing discloses that the second fuel value is less than the first fuel value, the maximum ICP limit is reduced from a greater value (ICPC_NORMAL_LMX) to a lesser value (ICPC_FL_LMX).
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Citations
15 Claims
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1. An internal combustion engine comprising:
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a control system; a fuel system that draws liquid fuel from a fuel tank to charge fuel injectors that when actuated by the control system force fuel charges into engine combustion chambers using hydraulic fluid at injection control pressure (ICP); and the control system comprising a processor for executing an ICP control strategy, wherein the strategy comprises processing a first fuel value indicative of the quantity of fuel presently in the tank and a second fuel value representing a quantity of fuel in the tank at which a maximum ICP limit set by the ICP control strategy should be changed, and when the result of the processing discloses that the second fuel value is less than the first fuel value, execution of the ICP control strategy reduces the maximum ICP limit from a greater value to a lesser value. - View Dependent Claims (2, 3, 4, 5)
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6. A fuel system and a control system for an internal combustion engine:
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wherein the fuel system draws liquid fuel from a fuel tank to charge fuel injectors that when actuated by the control system force fuel charges into engine combustion chambers using hydraulic fluid at injection control pressure (ICP); and wherein the control system comprises a processor for executing an ICP control strategy that comprises processing a first fuel value indicative of the quantity of fuel presently in the tank and a second fuel value representing a quantity of fuel in the tank at which a maximum ICP limit set by the ICP control strategy should be changed, and when the result of the processing discloses that the second fuel value is less than the first fuel value, causing the maximum ICP limit to be reduced from a greater value to a lesser value. - View Dependent Claims (7, 8, 9, 10)
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11. A method for control of injection control pressure (ICP) that is used to force the injection of fuel into an engine combustion chamber comprising:
processing a first fuel value indicative of the quantity of fuel presently in a fuel tank and a second fuel value representing a quantity of fuel in the tank at which a maximum ICP limit should be changed, and when the result of the processing discloses that the second fuel value is less than the first fuel value, causing the maximum ICP limit to be reduced from a greater value to a lesser value. - View Dependent Claims (12, 13, 14, 15)
Specification