Earl W Ekdahl, 8819 Makarainen Rd, Ithaca, NY 14850
Earl Ekdahl Phones & Addresses
19 Makarainen Rd, Ithaca, NY 14850 607-2738194
Jamestown, NY
Sugar Grove, PA
19 Makarainen Rd, Ithaca, NY 14850 917-8627293
Work
Position:
Professional/Technical
Education
Degree:
High school graduate or higher
Mentions for Earl W Ekdahl
Publications & IP owners
Us Patents
Vct Solenoid Dither Frequency Control
US Patent:
6736094, May 18, 2004
Filed:
Apr 4, 2003
Appl. No.:
10/408998
Inventors:
Earl Ekdahl - Ithaca NY
Danny R. Taylor - Freeville NY
Danny R. Taylor - Freeville NY
Assignee:
Borgwarner Inc. - Auburn Hills MI
International Classification:
F01L 134
US Classification:
123 9015, 123 9011, 25112908, 318631, 91429
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.
Vct Cam Timing System Utilizing Calculation Of Intake Phase For Dual Dependent Cams
US Patent:
6745732, Jun 8, 2004
Filed:
Nov 25, 2002
Appl. No.:
10/303575
Inventors:
Earl Ekdahl - Ithaca NY
Assignee:
BorgWarner Inc. - Auburn Hills MI
International Classification:
F01L 134
US Classification:
123 9015, 123 9017, 74568 R
Abstract:
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.
Control Method For Preventing Integrator Wind-Up When Operating Vct At Or Near Its Physical Stops
US Patent:
6766776, Jul 27, 2004
Filed:
Nov 1, 2002
Appl. No.:
10/285854
Inventors:
Zhenyu Jiang - Ithaca NY
Earl Ekdahl - Ithaca NY
Earl Ekdahl - Ithaca NY
Assignee:
BorgWarner Inc. - Auburn Hills MI
International Classification:
F01L 134
US Classification:
123 9015, 123 9017
Abstract:
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 Transitions Between Open And Closed Loop Operation In Electronic Vct Controls
US Patent:
6807931, Oct 26, 2004
Filed:
Apr 7, 2003
Appl. No.:
10/408400
Inventors:
Danny R. Taylor - Freeville NY, 13068
Earl Ekdahl - Ithaca NY, 14850
Earl Ekdahl - Ithaca NY, 14850
International Classification:
F01L 134
US Classification:
123 9017, 123 9015, 123 9011, 123 9031, 123 9016
Abstract:
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.
Methods And Apparatus For Receiving Excessive Inputs In A Vct System
US Patent:
6955145, Oct 18, 2005
Filed:
Jun 4, 2004
Appl. No.:
10/860982
Inventors:
Thomas McCabe - Ithaca NY, US
Danny R. Taylor - Freeville NY, US
Earl Ekdahl - Ithaca NY, US
Danny R. Taylor - Freeville NY, US
Earl Ekdahl - Ithaca NY, US
Assignee:
BorgWarner Inc. - Auburn Hills MI
International Classification:
F01L001/34
US Classification:
123 9015, 123 9016, 123 9017, 123 9031, 318616, 91364, 701102, 701105, 13762411, 13762413, 235104
Abstract:
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.
Compensating For Vct Phase Error Over Speed Range
US Patent:
7021257, Apr 4, 2006
Filed:
Apr 2, 2003
Appl. No.:
10/405513
Inventors:
Earl Ekdahl - Ithaca NY, US
Danny R. Taylor - Freeville NY, US
Danny R. Taylor - Freeville NY, US
Assignee:
BorgWarner, Inc. - Auburn Hills MI
International Classification:
F01L 1/34
US Classification:
123 9015, 74568 R, 92121, 123 9017
Abstract:
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.
Method And Apparatus For Extended Cam Position Measurement
US Patent:
2005022, Oct 20, 2005
Filed:
Jun 4, 2004
Appl. No.:
10/860983
Inventors:
Thomas McCabe - Ithaca NY, US
Earl Ekdahl - Ithaca NY, US
Earl Ekdahl - Ithaca NY, US
Assignee:
BorgWarner Inc. - Auburn Hills MI
International Classification:
G01R013/02
US Classification:
073117300
Abstract:
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.
Self-Calibrating Variable Camshaft Timing System
US Patent:
5289805, Mar 1, 1994
Filed:
Dec 16, 1992
Appl. No.:
7/995661
Inventors:
Stanley B. Quinn - Ithaca NY
Earl W. Ekdahl - Ithaca NY
Earl W. Ekdahl - Ithaca NY
Assignee:
Borg-Warner Automotive Transmission & Engine Components Corporation - Sterling Heights MI
International Classification:
F01L 134
US Classification:
123 9017
Abstract:
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.
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