Earl W Ekdahl

6736094, May 18, 2004

Apr 4, 2003

10/408998

Earl Ekdahl - Ithaca NY
Danny R. Taylor - Freeville NY

Borgwarner Inc. - Auburn Hills MI

F01L 134

123 9015, 123 9011, 25112908, 318631, 91429

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.

6745732, Jun 8, 2004

Nov 25, 2002

10/303575

Earl Ekdahl - Ithaca NY

BorgWarner Inc. - Auburn Hills MI

F01L 134

123 9015, 123 9017, 74568 R

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.

6766776, Jul 27, 2004

Nov 1, 2002

10/285854

Zhenyu Jiang - Ithaca NY
Earl Ekdahl - Ithaca NY

BorgWarner Inc. - Auburn Hills MI

F01L 134

123 9015, 123 9017

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.

6807931, Oct 26, 2004

Apr 7, 2003

10/408400

Danny R. Taylor - Freeville NY, 13068
Earl Ekdahl - Ithaca NY, 14850

F01L 134

123 9017, 123 9015, 123 9011, 123 9031, 123 9016

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.

6955145, Oct 18, 2005

Jun 4, 2004

10/860982

Thomas McCabe - Ithaca NY, US
Danny R. Taylor - Freeville NY, US
Earl Ekdahl - Ithaca NY, US

BorgWarner Inc. - Auburn Hills MI

F01L001/34

123 9015, 123 9016, 123 9017, 123 9031, 318616, 91364, 701102, 701105, 13762411, 13762413, 235104

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.

7021257, Apr 4, 2006

Apr 2, 2003

10/405513

Earl Ekdahl - Ithaca NY, US
Danny R. Taylor - Freeville NY, US

BorgWarner, Inc. - Auburn Hills MI

F01L 1/34

123 9015, 74568 R, 92121, 123 9017

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.

20050229687, Oct 20, 2005

Jun 4, 2004

10/860983

Thomas McCabe - Ithaca NY, US
Earl Ekdahl - Ithaca NY, US

BorgWarner Inc. - Auburn Hills MI

G01R013/02

073117300

A system and method for determining a phase offset in a system having at least two rotating shafts moving in relation to each other is provided including a scheme, wherein two sets of registers having a first set of registers associated with the first rotating shaft, and the second set of registers associated with the second rotating shaft, providing at least one flag for directing or pointing at a particular register for storing values relating to the consecutive pulses; providing a controller for controlling the flag and the storage of values; determining a register among the set of registers shall store data; and pointing the flag to the register, thereby the information relating to phase shall not be lost or overwritten by using a single set of register for a single type of information.

52898059, Mar 1, 1994

Dec 16, 1992

7/995661

Stanley B. Quinn - Ithaca NY
Earl W. Ekdahl - Ithaca NY

Borg-Warner Automotive Transmission & Engine Components Corporation - Sterling Heights MI

F01L 134

123 9017

A camshaft (26) has a vane (60) secured to an end thereof for non-oscillag rotation therewith. The camshaft also carries a sprocket (32) which can rotate with the camshaft (26) but which is also oscillatable with the camshaft (26). The vane (60) has opposed lobes (60a, 60b) which are received in opposed recesses (32a, 32b), respectively, of the sprocket (32). The recesses have greater circumferential extent than the lobes (60a, 60b) to permit the vane (60) and sprocket (32) to oscillate with respect to one another, and thereby permit the camshaft (26) to change in phase relative to a crankshaft whose phase relative to the sprocket (32) is fixed by virtue of a chain drive (38) extending therebetween.