Ethanol content determination systems and methods
First Claim
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1. A combustion control system for a vehicle, comprising:
- a position determination module that is configured to determine a crankshaft angle where a predetermined percentage of a fuel was combusted within a cylinder of an engine during an engine cycle based on pressure within said cylinder measured by a cylinder pressure sensor during said engine cycle;
heat release module that is configured to determine a heat release profile for said fuel based on cylinder pressures measured by said cylinder pressure sensor during said engine cycle,wherein said position determination module is configured to determine said crankshaft angle based on said heat release profile; and
an ethanol determination module that is configured to determine an ethanol content of said fuel based on said crankshaft angle.
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Abstract
A combustion control system for a vehicle comprises a position determination module and an ethanol determination module. The position determination module determines a crankshaft angle where a predetermined percentage of a fuel was combusted within a cylinder of an engine during an engine cycle based on one of pressure within the cylinder measured by a cylinder pressure sensor during the engine cycle and torque on a crankshaft measured by a torque sensor during the engine cycle. The ethanol determination module determines an ethanol content of the fuel based on the crankshaft angle.
12 Citations
10 Claims
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1. A combustion control system for a vehicle, comprising:
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a position determination module that is configured to determine a crankshaft angle where a predetermined percentage of a fuel was combusted within a cylinder of an engine during an engine cycle based on pressure within said cylinder measured by a cylinder pressure sensor during said engine cycle; heat release module that is configured to determine a heat release profile for said fuel based on cylinder pressures measured by said cylinder pressure sensor during said engine cycle, wherein said position determination module is configured to determine said crankshaft angle based on said heat release profile; and an ethanol determination module that is configured to determine an ethanol content of said fuel based on said crankshaft angle. - View Dependent Claims (2, 3, 4)
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5. A combustion control system for a vehicle, comprising:
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a position determination module that is configured to determine a crankshaft angle where a predetermined percentage of a fuel was combusted within a cylinder of an engine during an engine cycle based on torque on a crankshaft measured by a torque sensor during said engine cycle; an ethanol determination module that is configured to determine an ethanol content of said fuel based on said crankshaft angle; and a torque ratio determination module that is configured to determine torque ratios based on torques measured by said torque sensor during said engine cycle and motored torques for said cylinder, wherein said position determination module is configured to determine said crankshaft angle based on said torque ratios. - View Dependent Claims (6, 7)
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8. A combustion control system for a vehicle, comprising:
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a position determination module that is configured to determine a crankshaft angle where a predetermined percentage of a fuel was combusted within a cylinder of an engine during an engine cycle based on torque on a crankshaft measured by a torque sensor during said engine cycle; an ethanol determination module that is configured to determine an ethanol content of said fuel based on said crankshaft angle; and a torque ratio determination module that is configured to determine torque ratios based on torques measured by said torque sensor during said engine cycle and motored torques for said cylinder and determine a percent torque ratio based on said torque ratios, wherein said position determination module is configured to determine said crankshaft angle based on said percent torque ratio. - View Dependent Claims (9, 10)
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Specification