VCT solenoid dither frequency control
First Claim
1. A method using a dither signal for reducing hysteresis effect in a variable cam timing system, comprising the steps of:
- a) providing a dither signal having at least two switchable frequencies;
b) determining the frequency characteristics of an engine at different speeds;
c) determining at least one frequency beating point in relation to a neighborhood of an engine crank RPM values; and
d) changing the dither signal frequency when the engine is operating within the neighborhood of the engine crank RPM values, thereby reducing frequency beating effect.
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Accused Products
Abstract
A method that uses a dither signal for reducing hysteresis effect in a variable cam timing system is provided. The method includes the steps of: a) providing a dither signal having at least two switchable frequencies; b) determining the frequency characteristics of an engine speed; c) determining at least one frequency beating point in relation to a neighborhood of an engine crank RPM values; and d) changing the dither signal frequency when the engine is operating within the neighborhood of the engine crank RPM values. Thereby frequency beating effect is reduced.
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Citations
8 Claims
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1. A method using a dither signal for reducing hysteresis effect in a variable cam timing system, comprising the steps of:
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a) providing a dither signal having at least two switchable frequencies;
b) determining the frequency characteristics of an engine at different speeds;
c) determining at least one frequency beating point in relation to a neighborhood of an engine crank RPM values; and
d) changing the dither signal frequency when the engine is operating within the neighborhood of the engine crank RPM values, thereby reducing frequency beating effect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification