Fuel property determination system for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorRyoji Nishiumi
Life of this patent
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Abstract
A fuel injection pressure at a timing at which an NOx concentration (combustion temperature) indicates a maximum value under the condition that a fuel injection timing is fixed to a first injection timing is recorded as a first NOx peak injection pressure. Similarly, a second NOx peak injection pressure is recorded under the condition that the fuel injection timing is fixed to a second injection timing. A cetane number and distillation property of fuel are determined on the basis of these NOx peak injection pressures.
Claims14
A fuel property determination system for a compression ignition internal combustion engine, comprising:
- a first parameter changing unit that is configured to change a first operating parameter for varying a degree of mixing of fuel and air that are supplied into a combustion chamber of the internal combustion engine;
- a second parameter changing unit that is configured to change a second operating parameter for varying a combustion temperature of a mixture of fuel and air;
- a determination unit that is configured to determine a timing at which the combustion temperature indicates a maximum value when the first operating parameter is changed under the condition that the second operating parameter is fixed;
- a first recording unit that is configured to record the first operating parameter at the timing at which the determination unit determines that the combustion temperature indicates the maximum value under the condition that the second operating parameter (InjT) is fixed to a predetermined first setting value as a first recorded value;
- a second recording unit that is configured to record the first operating parameter at the timing at which the determination unit determines that the combustion temperature indicates the maximum value under the condition that the second operating parameter is fixed to a predetermined second setting value as a second recorded value:
- and
- a fuel property determination unit that is configured to determine a cetane number and evaporation index of the fuel on the basis of the first recorded value and the second recorded value.
A fuel property determination system for a spark ignition internal combustion engine, comprising:
- a first parameter changing unit that is configured to change a first operating parameter for varying a degree of mixing of fuel and air that are supplied into a combustion chamber of the internal combustion engine;
- a second parameter changing unit that is configured to change a second operating parameter for varying a combustion temperature of a mixture of fuel and air;
- a determination unit that is configured to determine a timing at which the combustion temperature indicates a maximum value when the first operating parameter is changed under the condition that the second operating parameter is fixed;
- a first recording unit that is configured to record the first operating parameter at the timing at which the determination unit determines that the combustion temperature indicates the maximum value under the condition that the second operating parameter is fixed to a predetermined first setting value as a first recorded value;
- a second recording unit that is configured to record the first operating parameter at the timing at which the determination unit determines that the combustion temperature indicates the maximum value under the condition that the second operating parameter is fixed to a predetermined second setting value as a second recorded value;
- and
- a fuel property determination unit that is configured to determine an octane number and evaporation index of the fuel on the basis of the first recorded value and the second recorded value.
Dependencies are inferred from the claim text.