Borgwarner Inc.

Other

Earl Ekdahl

Danny R Taylor

Stanley B Quinn, Jr

Zhenyu Jiang

Thomas McCabe

A method for compensating for variable cam timing of an internal combustion engine is provided. The method includes: a) providing a periodical crank pulse signal; b) providing a periodical cam pulse signal; c) determining a segment, wherein the internal combustion engine speed induces a volatile change upon Zphase values; d) dividing the segment into sub-segments; and e) calculating Zphase values of a plurality of points within the sub-segments.

Compensating for VCT phase error over speed range

A method that provides increased flexibility to measure dynamic range of a rotating system is provided. The method includes the steps of: providing a first rotating member; providing a second rotating member suitably engaged to the first rotating member; providing a set of sensors disposed to sense variations in characteristics along a circumference of the first member and the second member respectively; providing a controller for receiving information sensed by the sensors; determining a rate of rotation of the rotating members; selectively using the sensed information thereby at different rate of rotation different amount of the sensed information is used.

Methods and apparatus for receiving excessive inputs in a VCT system

In a Variable Cam Timing (VCT) control system, there are conditions when the system must operate in an open-loop mode, and other situations where closed-loop operation is desired. A number of operating states is provided for VCT control system to switch between the states. A control methodology for switching between these two modes of operation, with minimal disturbances, is described. Further, during switching from open loop to closed loop, a scheme that impedes the impact upon the VCT system is provided.

Control method for transitions between open and closed loop operation in electronic VCT controls

In a VCT system, a method uses a controller to automatically determine a state of a phaser based on an identifier. The identifier identifies a filtered signal of the crank shaft and cam shaft and uses the same to identify the phaser state. A reset signal is generated by the identifier to reset the VCT system, specifically to reset a control law whereby the unnecessary information retained by the VCT system is cleared. Therefore, the controller is able to promptly and accurately determine the phaser position and state.

Control method for preventing integrator wind-up when operating VCT at or near its physical stops

An engine with dependent intake cams requires a different method and formula to determine the phase of the intake cams. The exhaust camshaft drives the intake camshaft and so the intake cam position is dependent upon the exhaust cam position. The present invention provides a VCT cam timing system utilizing calculation of intake phase for dual dependent cams.

VCT cam timing system utilizing calculation of intake phase for dual dependent cams

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.

Growing community of inventors

Ithaca, NY, United States of America

Earl Ekdahl