Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2000-08-18
2001-10-23
Kwon, John (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
C123S476000, C073S117020
Reexamination Certificate
active
06305353
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to systems to detect rotational characteristics of a mechanical member, and more particularly, but not exclusively, relates to a sensor arrangement to detect a rotational characteristic of an engine crankshaft or camshaft.
With the advent of electronically controlled internal combustion engines, devices to detect rotation of the engine crankshaft or camshaft have become increasingly popular. For example, angular position of the crankshaft or “crank angle” is frequently sensed to control engine fueling, ignition, and exhaustion. Also, engine speed, as indicated by rotational speed of the crankshaft, is often an important parameter in various engine control system schemes. U.S. Pat. Nos. 5,476,082 to Carpenter et al., 5,361,630 to Kowalski, and 4,936,277 to Deutsch et al. are cited as general sources of background information relating to various electronic engine control systems which rely on measurement of crankshaft rotation.
In order to meet increasingly rigorous emission standards imposed on vehicles with internal combustion engines, crank angle needs to be measured with high precision. One way to provide the needed precision is to employ a crank angle detection system that has a sensor and a reference member which rotates with the crankshaft adjacent the sensor. The sensor is configured to detect rotation of the reference member.
One type of detection system has a reference member with several angularly spaced indicators, or “angle marks,” along its periphery which are configured to alter a magnetic field. As each one of these indicators moves past the sensor, the sensor detects the corresponding alteration of the magnetic field and generates a detection pulse. By varying the spacing of the indicators in a known manner, an index to the relative angular position of the crankshaft may be provided. Also, the rate of these pulses may be used to determine rotational speed of the crankshaft. U.S. Pat. Nos. 5,520,043 to Koelle et al., 5,469,823 to Ott et al., 5,460,134 to Ott et al., 4,760,827 to Schreiber et al., 4,442,822 to Kondo et al., and 4,365,602 to Stiller et al. are cited as examples of various types of crank angle detection systems.
In one crank angle detection system arrangement, a reference disc is attached to a transmission fly wheel external to the engine. Unfortunately, external placement of the disc usually requires a separate design effort for each different type of transmission offered with a given engine design. Therefore, in many instances it is desirable to provide the reference disc as part of the engine. However, attaching the disc directly to the crankshaft generally requires lengthening the crankshaft to provide an appropriate attachment site.
U.S. Pat. No. 5,361,630 to Kowalski discloses one attempt to solve this problem by integrally forming indicator slots on a crankshaft counter weight which then serves as a rotational reference member. Unfortunately, this approach still requires an extensive re-design of the crankshaft. Also, the integral counter weight design requires disassembly of the crankshaft should replacement or adjustment of the reference member be required.
Thus, there remains a need for a crankshaft rotation detection system that can be readily adapted to different engine configurations. The present invention satisfies this need.
SUMMARY OF THE INVENTION
The present invention provides for an apparatus including an internal combustion engine with a camshaft gear, the camshaft gear being configured to rotate about a rotational axis during engine operation. A wheel is attached to the camshaft gear, including a plurality of reference indicators. The reference indicators are spaced apart from one another by a first angular width. The wheel includes a position indicator which is spaced apart from the reference indicators by a second angular width greater than the first angular width. The apparatus also includes a sensor mounted to the engine whereby the wheel rotates proximate to the sensor.
It is an object of the present invention to provide an improved apparatus for measuring the rotational speed and angular position of an internal combustion engine.
These and other objects of the invention will be apparent from the description of the preferred embodiment, the description of the drawings, the drawings, and the claims to follow.
REFERENCES:
patent: 3626224 (1971-12-01), Vigneault et al.
patent: 4002937 (1977-01-01), Anson
patent: 4155340 (1979-05-01), Fernquist et al.
patent: 4235101 (1980-11-01), Stadelmann
patent: 4356447 (1982-10-01), Honig et al.
patent: 4365602 (1982-12-01), Stiller et al.
patent: 4442822 (1984-04-01), Kondo et al.
patent: 4558591 (1985-12-01), Francis et al.
patent: 4715009 (1987-12-01), Böhmler et al.
patent: 4760827 (1988-08-01), Schreiber et al.
patent: 4766865 (1988-08-01), Hartel
patent: 4779454 (1988-10-01), Fitzner et al.
patent: 4833405 (1989-05-01), Richards et al.
patent: 4932388 (1990-06-01), Chiba et al.
patent: 4936277 (1990-06-01), Deutsch et al.
patent: 4942761 (1990-07-01), Batzill
patent: 4972332 (1990-11-01), Luebbering et al.
patent: 4989574 (1991-02-01), Abe
patent: 5070727 (1991-12-01), Davis et al.
patent: 5109695 (1992-05-01), James et al.
patent: 5119670 (1992-06-01), Whitehorn et al.
patent: 5144233 (1992-09-01), Christenson et al.
patent: 5165271 (1992-11-01), Stepper et al.
patent: 5166611 (1992-11-01), Kujawa, Jr. et al.
patent: 5227719 (1993-07-01), Peterson et al.
patent: 5243279 (1993-09-01), Bajat et al.
patent: 5293776 (1994-03-01), Takegami et al.
patent: 5331154 (1994-07-01), Kondo et al.
patent: 5347857 (1994-09-01), Mirhakimi et al.
patent: 5361630 (1994-11-01), Kowalski
patent: 5428992 (1995-07-01), Wolfe et al.
patent: 5444369 (1995-08-01), Luetzow
patent: 5460134 (1995-10-01), Ott et al.
patent: 5469055 (1995-11-01), Mueller et al.
patent: 5469823 (1995-11-01), Ott et al.
patent: 5476082 (1995-12-01), Carpenter et al.
patent: 5520043 (1996-05-01), Koelle et al.
patent: 5541506 (1996-07-01), Kawakita et al.
patent: 5548995 (1996-08-01), Clinton et al.
patent: 5555776 (1996-09-01), Gazza
patent: 5560462 (1996-10-01), Gustin
patent: 5583431 (1996-12-01), Ouchi et al.
patent: 5614821 (1997-03-01), Leiderer
patent: 5614822 (1997-03-01), Sakamoto et al.
patent: 5621644 (1997-04-01), Carson et al.
patent: 5647322 (1997-07-01), Fukui et al.
patent: 5671714 (1997-09-01), Fukui et al.
patent: 5789658 (1998-08-01), Henn et al.
patent: 5821411 (1998-10-01), Lohmann et al.
patent: 5823166 (1998-10-01), Etenmann et al.
patent: 5856922 (1999-01-01), Jehanno
patent: 5881696 (1999-03-01), Wada
patent: 5965806 (1999-10-01), Antcliff et al.
patent: 6016789 (2000-01-01), Denz et al.
patent: 6035826 (2000-03-01), Matsuoka
patent: 2604599 A1 (1977-08-01), None
patent: 3702474 (1987-08-01), None
patent: 4309245 A1 (1994-09-01), None
patent: 0 569 613 A1 (1993-11-01), None
patent: 0 665 375 A2 (1995-02-01), None
patent: 2 272 973 A (1994-06-01), None
Antcliff G. Steven
Purcell, III John Jerl
Weber Gregory A.
Cummins Engine Company
Kwon John
Woodard Emhardt Naughton Moriarty & McNett
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