Unlock instant, AI-driven research and patent intelligence for your innovation.

Cam position measurement for embedded control VCT systems using non-ideal pulse-wheels for cam position measurement

a technology of embedded control and position measurement, applied in electrical control, valve arrangement, machines/engines, etc., can solve the problem of not knowing whether to use a given non-symmetrical pulse wheel or tooth wheel

Inactive Publication Date: 2005-02-10
BORGWARNER INC
View PDF21 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not known to use a given non-symmetrical pulse wheel or tooth wheel to accommodate existing VCT systems including at least one phaser in which a controller still considers pulse wheel as being symmetrical.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cam position measurement for embedded control VCT systems using non-ideal pulse-wheels for cam position measurement
  • Cam position measurement for embedded control VCT systems using non-ideal pulse-wheels for cam position measurement
  • Cam position measurement for embedded control VCT systems using non-ideal pulse-wheels for cam position measurement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

Phase Measurement Over 2 Crank Revolutions:

In an Embedded Control System, which are used primarily for control of a VCT system, pulse wheels are mounted on both the crankshaft and the camshaft(s) of an internal combustion engine. These pulse wheels are chosen based on what sort of original equipment exists on the engine, what update rate is desired, and the basic relationship that exists between cam and crankshafts. This relationship may be such that for every 2 revolutions of the crank, the cam revolves once. Therefore, in an arbitrary design of the present VCT system, a 4 pulse / rev wheel for the crankshaft, and an 8 pulse / rev wheel for the camshaft(s) are chosen. Due to the relationship between the cam(s) and crank shafts, the frequency of pulses from the pulse wheels is equal, i.e. at 4 pulses / crank-revolution. Calibration and cam position measurement based on this scheme are documented in U.S. Pat. Nos. 5,289,805 and 5,184,578, which are hereby incorporated herein by referenc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In a VCT system having a phaser and pulse wheels on driving and driven shafts respectively in which the pulse wheels have known tooth distribution thereon, a device and method is used for adjusting values of a controller that controls the timing between the driving and driven shaft. Additional subroutines are performed with respect to the driving shaft tooth wheel and the driven shaft tooth wheel respectively. The known tooth distribution includes non-symmetric tooth distribution.

Description

FIELD OF THE INVENTION The invention pertains to the field of cam position measurement. More particularly, the invention pertains to cam position measurement for embedded control VCT systems using non-ideal pulse-wheels for cam position measurement. BACKGROUND OF THE INVENTION United States published patent application, 2002 / 0050272 entitled CYLINDER IDENTIFYING SYSTEM FOR INTERNAL COMBUSTION ENGINE, teaches a cylinder identifying system for an internal combustion engine capable of establishing a complicated cam signal pulse pattern without need for setting specific periods for cylinder identification while enhancing control performance by reducing a crank rotation angle required for cylinder identification. A cylinder identifying means (10) for identifying discriminatively individual cylinders on the basis of a crank angle pulse signal (SGT) and a cam pulse signal (SGC) includes a pulse signal number storage means (12) for counting for storage signal numbers of specific pulses ge...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F02D45/00F01L1/34F02D13/02
CPCF01L1/022F01L1/024F01L2820/041F01L2800/00F01L2820/02F01L1/34
Inventor MCCABE, THOMAS
Owner BORGWARNER INC