Engine position detection using manifold pressure
First Claim
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1. A method for sensing an intake stroke of a predetermined cylinder in an internal combustion engine having a plurality of cylinders and having an air intake manifold, comprising the steps of:
- sensing air pressure at a predetermined location in the air intake manifold in proximity to an air intake path to the predetermined cylinder;
generating a signal representative of the sensed air pressure; and
sensing the intake stroke of the predetermined cylinder when the signal is at a minimum value.
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Abstract
The absolute angular position of an internal combustion engine is determined by monitoring engine intake manifold pressure at a strategic position in the manifold affected most significantly by the intake event of a predetermined cylinder. A significant or maximum depression in manifold pressure over each engine cycle then is indicative of the intake stroke of the predetermined cylinder.
45 Citations
9 Claims
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1. A method for sensing an intake stroke of a predetermined cylinder in an internal combustion engine having a plurality of cylinders and having an air intake manifold, comprising the steps of:
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sensing air pressure at a predetermined location in the air intake manifold in proximity to an air intake path to the predetermined cylinder; generating a signal representative of the sensed air pressure; and sensing the intake stroke of the predetermined cylinder when the signal is at a minimum value. - View Dependent Claims (2, 3, 4)
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5. A method for determining when an engine having an intake manifold is at a predetermined operating angle within an engine cycle, comprising the steps of:
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sensing air pressure in the intake manifold at a predetermined position in proximity to an air intake of a predetermined cylinder; determining when the sensed air pressure is at a minimum pressure over the engine cycle; and determining the engine to be at the predetermined operating angle when the sensed air pressure is at the minimum pressure.
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6. An apparatus for sensing an intake stroke of a predetermined cylinder in an internal combustion engine having a plurality of cylinders and having an air intake manifold, comprising:
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a pressure sensor for sensing air pressure in the engine intake manifold at a predetermined position in proximity to an intake air path to the predetermined cylinder; signal generating means for generating a signal representative of the sensed air pressure; and means for sensing the intake stroke of the predetermined cylinder when the pressure signal is at a minimum value. - View Dependent Claims (7, 8, 9)
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Specification