US5647318A
Expired / Lapsed
US
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Engine compression braking apparatus and method
Assignee: Caterpillar Inc
•
Filing: 1995-08-11
•
Granted: 1997-07-15
•
Expires: 2015-08-11
Abstract
Abstract A braking control for an engine permits the timing and duration of exhaust valve opening to be accurately determined independent of engine events so that braking power can be precisely controlled.
Inventors
- 👤 Dennis D. Feucht
- 👤 Scott G. Sinn
- 👤 James J. Faletti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/04; F01; F01L; F01L13/00; F01L13/06; F01L13/065; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1824; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
90 words
A braking control for an engine having a combustion chamber and an exhaust valve movable between open and closed positions wherein the engine is operable to undergo engine events each of which occurs at a timing point, comprising: electrohydraulic means for engaging the exhaust valve; and control means for timing movement of the exhaust valve to the open position selectably independent of the timing points to thereby permit selection of an adjustable braking magnitude including means for storing actuation points and means for selecting actuation points from the storing means.
Claim 2
Dependent Claim
90 words
A braking control for an engine having a combustion chamber and an exhaust valve movable between open and closed positions wherein the engine is operable to undergo engine events each of which occurs at a timing point, comprising: electrohydraulic means for engaging the exhaust valve; and control means for timing movement of the exhaust valve to the open position selectably independent of the timing points to thereby permit selection of an adjustable braking magnitude including means for storing actuation points and means for selecting actuation points from the storing means.
Claim 3
Dependent Claim
25 words
The braking control of claim 1, wherein the control means includes means for maintaining the exhaust port in the open position for a selectable duration.
Claim 4
Dependent Claim
17 words
The braking control of claim 1, wherein the control means is implemented by an engine control module.
Claim 5
Dependent Claim
22 words
The braking control of claim 1, wherein the electrohydraulic means includes a master fluid control device and a slave fluid control device.
Claim 6
Dependent Claim
30 words
The braking control of claim 4, wherein the master fluid control device comprises a valve spool which is movable to apply high pressure fluid to the slave fluid control device.
Claim 7
Dependent Claim
20 words
The braking control of claim 5, wherein the slave fluid control device comprises a piston disposed adjacent the valve spool.
Claim 8
Dependent Claim
22 words
The braking control of claim 6, wherein the electrohydraulic means further includes a spring disposed between the valve spool and the piston.
Claim 9
Dependent Claim
63 words
The braking control of claim 7, wherein the piston includes a passage and wherein the spool includes a high pressure annulus coupled to a source of high fluid pressure and a low pressure annulus coupled to a source of low fluid pressure and is movable relative to the piston to interconnect the passage with the high pressure annulus or the low pressure annulus.
Claim 10
Dependent Claim
27 words
The braking control of claim 8, wherein the electrohydraulic means further includes a return passage interconnecting the low pressure annulus and the source of high fluid pressure.
Claim 11
Dependent Claim
40 words
The braking control of claim 7, wherein the spring is disposed in compression on a first side of the piston and wherein the electrohydraulic means further includes a return spring disposed in compression on a second side of the piston.
Claim 12
Dependent Claim
35 words
The braking control of claim 10, wherein the spring on the first side of the piston has a spring rate exceeding a spring rate of the return spring on the second side of the piston.
Claim 13
Dependent Claim
41 words
The braking control of claim 1, wherein the electrohydraulic means includes an actuator pin engagable with the exhaust valve and means for limiting travel of the actuator pin to provide a selectable lash between the actuator pin and the exhaust valve.
Claim 14
Dependent Claim
29 words
The braking control of claim 12, wherein the electrohydraulic means includes an actuator body and wherein the limiting means comprises a lash stop adjuster carried by the actuator body.
Claim 15
Dependent Claim
26 words
The braking control of claim 4, wherein the electrohydraulic means includes a valve disposed between a high pressure fluid passage and the master fluid control device.
Claim 16
Dependent Claim
41 words
The braking control of claim 14, wherein the valve includes a movable ball element and wherein the electrohydraulic means further includes means for moving the ball element to selectively couple the high pressure fluid passage to the master fluid control device.
Claim 17
Dependent Claim
61 words
The braking control of claim 1, wherein fuel is injected into the combustion chamber by an electrically-controlled fuel injector and wherein the control means is connected to first terminals of both of the electrohydraulic means and the fuel injector by a single wire and to second terminals of the electrohydraulic means and the fuel injector by a pair of additional wires.
Claim 18
Dependent Claim
18 words
The braking control of claim 16, wherein diodes are connected in series with the pair of additional wires.
Claim 19
Dependent Claim
43 words
The braking control of claim 1, wherein the electrohydraulic means includes an actuator, a source of high pressure fluid including an accumulator which is pressurized by a rocker arm driven pump and means for coupling the high pressure fluid source to the actuator.
Claim 20
Dependent Claim
19 words
The braking control of claim 1, in combination with an engine cruise control which develops a braking command signal.
Claim 21
Dependent Claim
18 words
The braking control of claim 1, in combination with a traction control which develops a braking command signal.
Claim 22
Dependent Claim
26 words
The braking control of claim 1, wherein the control means is further responsive to a position signal developed by a position sensor which detects camshaft position.
Claim 23
Dependent Claim
27 words
The braking control of claim 21, wherein the engine propels a vehicle and wherein the control means is further responsive to a speed signal representing vehicle speed.
Claim 24
Dependent Claim
25 words
The braking control of claim 1, wherein the engine includes a controllable inlet pressure boost apparatus and further including means for controlling the boost apparatus.
Claim 25
Dependent Claim
28 words
The braking control of claim 23, wherein the boost apparatus comprises a turbocharger having vanes movable in response to a turbo control signal generated by the controlling means.
Claim 26
Dependent Claim
138 words
A braking control for an engine having a combustion chamber and an exhaust valve movable between open and closed positions wherein the engine is operable to undergo engine events each of which occurs at a timing point, comprising: an electrically-operable control valve; an actuator coupled between the control valve and the exhaust valve and operable by the control valve to move the exhaust valve to an open position; and an electronic engine control coupled to the control valve for operating same to move the exhaust valve to the open position selectably independent of the timing points to thereby permit selection of an adjustable braking magnitude wherein the engine control includes a look-up table for storing actuation points, selection circuitry for selecting actuation points from the look-up table and drive circuitry for developing drive signals for the control valve.
Claim 27
Dependent Claim
138 words
A braking control for an engine having a combustion chamber and an exhaust valve movable between open and closed positions wherein the engine is operable to undergo engine events each of which occurs at a timing point, comprising: an electrically-operable control valve; an actuator coupled between the control valve and the exhaust valve and operable by the control valve to move the exhaust valve to an open position; and an electronic engine control coupled to the control valve for operating same to move the exhaust valve to the open position selectably independent of the timing points to thereby permit selection of an adjustable braking magnitude wherein the engine control includes a look-up table for storing actuation points, selection circuitry for selecting actuation points from the look-up table and drive circuitry for developing drive signals for the control valve.
Claim 28
Dependent Claim
39 words
The braking control of claim 25, wherein the drive circuitry includes computational circuits and delay circuits responsive to signals developed at an output of the look-up table for independently controlling timing and duration of opening of the exhaust valve.
Claim 29
Dependent Claim
30 words
The braking control of claim 26, wherein the drive circuitry further includes a solenoid driver coupled to the delay circuits and a cylinder select switch coupled to the solenoid driver.
Claim 30
Dependent Claim
27 words
The braking control of claim 27, wherein the electrically-operable control valve includes a solenoid winding coupled to the cylinder select switch, a load adapter and a valve.
Claim 31
Dependent Claim
24 words
The braking control of claim 25, wherein the actuator includes a valve element which is movable to apply high pressure fluid to a piston.
Claim 32
Dependent Claim
64 words
The braking control of claim 29, wherein the piston includes a passage and wherein the valve element includes a high pressure annulus coupled to a source of high fluid pressure and a low pressure annulus coupled to a source of low fluid pressure and is movable relative to the piston to interconnect the passage with the high pressure annulus or the low pressure annulus.
Claim 33
Dependent Claim
52 words
The braking control of claim 30, wherein a first spring is disposed in compression on a first side of the piston and a second spring is disposed in compression on a second side of the piston wherein the first spring has a spring rate exceeding a spring rate of the second spring.
Claim 34
Dependent Claim
40 words
The braking control of claim 25, wherein the actuator includes an actuator pin engagable with the exhaust valve and means for limiting travel of the actuator pin to provide a selectable lash between the actuator pin and the exhaust valve.
Claim 35
Dependent Claim
63 words
The braking control of claim 25, wherein fuel is injected into the combustion chamber by an electrically-controlled fuel injector and wherein the engine control is connected to first terminals of both of the control valve and the fuel injector by a single wire and to second terminals of the control valve and the fuel injector by a pair of additional wires and diodes.
Claim 36
Dependent Claim
25 words
The braking control of claim 25, wherein an accumulator pressurized by a rocker arm driven pump is coupled to the actuator by the control valve.
Claim 37
Dependent Claim
19 words
The braking control of claim 25, in combination with an engine cruise control which develops a braking command signal.
Claim 38
Dependent Claim
18 words
The braking control of claim 25, in combination with a traction control which develops a braking command signal.
Claim 39
Dependent Claim
27 words
The braking control of claim 25, wherein the engine propels a vehicle and wherein the engine control is further responsive to a speed signal representing vehicle speed.
Claim 40
Dependent Claim
27 words
The braking control of claim 25, wherein the engine includes a turbocharger having vanes movable in response to a turbo control signal developed by the engine control.
References Cited (Backward Citations)
US1947996A
Cited
GB482990A
Cited
US2876876A
Cited
US3023870A
Cited
US3202182A
Cited
US3254743A
Cited
US3220392A
Cited
US3234923A
Cited
US3332405A
Cited
US3367312A
Cited
US3405699A
Cited
GB1229207A
Cited
US3525317A
Cited
US3520287A
Cited
US3547087A
Cited
US3680318A
Cited
US3786792A
Cited
DE2151331A1
Cited
US3808948A
Cited
US3809033A
Cited
US3859970A
Cited
US3982507A
Cited
US4052930A
Cited
US4054156A
Cited
US4062332A
Cited
US4355605A
Cited
US4223649A
Cited
US4305353A
Cited
US4215723A
Cited
US4114643A
Cited
US4226216A
Cited
US4174687A
Cited
US4093046A
Cited
FR2391358B3
Cited
US4138849A
Cited
US4158348A
Cited
US4173209A
Cited
US4175534A
Cited
US4164917A
Cited
US4188933A
Cited
US4150640A
Cited
US4201362A
Cited
GB2037368B
Cited
US4398510A
Cited
US4220008A
Cited
US4251051A
Cited
US4271796A
Cited
US4333430A
Cited
US4393832A
Cited
US4378765A
Cited
US4296605A
Cited
US4363301A
Cited
US4473047A
Cited
US4596271A
Cited
US4464977A
Cited
US4367702A
Cited
US4395884A
Cited
US4429532A
Cited
US4384558A
Cited
US4455977A
Cited
US4466390A
Cited
US4450801A
Cited
US4399787A
Cited
US4423712A
Cited
US4474006A
Cited
US4510900A
Cited
US4485780A
Cited
US4494726A
Cited
EP0139566B1
Cited
US4475500A
Cited
US4553732A
Cited
US4572114A
Cited
US4662332A
Cited
DE3428626C2
Cited
US4658781A
Cited
US4674451A
Cited
US4688384A
Cited
US4655178A
Cited
US4703723A
Cited
US4592319A
Cited
US4765288A
Cited
US4648365A
Cited
US4664070A
Cited
US4651687A
Cited
US4697558A
Cited
US4706624A
Cited
US4949751A
Cited
US4898206A
Cited
USRE33052E
Cited
US4838516A
Cited
US4706625A
Cited
US4742806A
Cited
US4836162A
Cited
US4711210A
Cited
US4957075A
Cited
US4741307A
Cited
US4809587A
Cited
US4794890A
Cited
US4793307A
Cited
FR2616481A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-14 | 2001-01-13 | 2001-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-14 | 2005-01-13 | 2005-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-14 | 2009-01-13 | 2009-07-15 | $7700.00 | Window Closed / Lapsed |