EP0640750A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Compression release engine braking systems
Assignee: Jacobs Brake Tech Corp
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Filing: 1994-08-18
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Granted: —
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Expires: 2014-08-18
Abstract
Abstract In a compression release engine braking system for a turbocharged internal combustion engine, excessive stress associated with opening the exhaust valves of the engine near top dead center of engine compression strokes when the engine is turning at high speed is prevented by reducing the intake manifold pressure from what it otherwise would be at that high speed. This is done by retarding the turbocharger so that its speed is less than it otherwise would be at high engine speed. Turbocharger retarding can be accomplished in any of several ways such as by restricting the flow of engine exhaust gas to or from the turbocharger, or by allowing a portion of the exhaust gas to bypass the turbocharger.
Inventors
- 👤 Gregory T.H. Davies
- 👤 Dennis R. Custer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 13:15
CPC Classifications
F; F02; F02D; F02D23/00; F02D23/02; F01; F01L; F01L13/00; F01L13/06; F01L13/065; F02D13/00; F02D13/02; F02D13/04; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
118 words
In a compression release engine braking system including a turbocharged internal combustion engine and a compression release engine brake for opening at least one exhaust valve in the engine near top dead center of the compression stroke of the engine piston in the engine cylinder served by that exhaust valve, apparatus for reducing the force required from the engine brake to open said exhaust valve when the engine is turning at relatively high speeds comprising: means for monitoring a characteristic of the engine which is indicative of engine speed; and means responsive to said means for monitoring for retarding the turbocharger when said characteristic indicates that the speed of the engine is greater than a predetermined threshold value.
Claim 2
Dependent Claim
118 words
In a compression release engine braking system including a turbocharged internal combustion engine and a compression release engine brake for opening at least one exhaust valve in the engine near top dead center of the compression stroke of the engine piston in the engine cylinder served by that exhaust valve, apparatus for reducing the force required from the engine brake to open said exhaust valve when the engine is turning at relatively high speeds comprising: means for monitoring a characteristic of the engine which is indicative of engine speed; and means responsive to said means for monitoring for retarding the turbocharger when said characteristic indicates that the speed of the engine is greater than a predetermined threshold value.
Claim 3
Dependent Claim
27 words
The apparatus defined in claim 1 wherein said means for retarding comprises: means for restricting the flow of engine exhaust gas through the turbine of the turbocharger.
Claim 4
Dependent Claim
16 words
The apparatus defined in claim 2 wherein said means for restricting comprises a variable flow restrictor.
Claim 5
Dependent Claim
24 words
The apparatus defined in claim 3 wherein said variable flow restrictor is disposed in the exhaust line of said engine downstream from said turbine.
Claim 6
Dependent Claim
24 words
The apparatus defined in claim 3 wherein said variable flow restrictor is disposed in the exhaust line of said engine upstream from said turbine.
Claim 7
Dependent Claim
29 words
The apparatus defined in claim 1 wherein said means for retarding comprises: means for allowing a portion of the engine exhaust gas to bypass the turbine of the turbocharger.
Claim 8
Dependent Claim
24 words
The apparatus defined in claim 1 wherein said means for monitoring comprises: means for monitoring the pressure of the gas in said intake manifold.
Claim 9
Dependent Claim
21 words
The apparatus defined in claim 1 wherein said means for monitoring comprises: a tachometer for monitoring the speed of the engine.
Claim 10
Independent Claim
118 words
A method of operating a compression release engine braking system which includes a turbocharged internal combustion engine and a compression release engine brake for opening at least one exhaust valve in the engine near top dead center of the compression stroke of the engine piston in the engine cylinder served by that exhaust valve, said method comprising the steps of: monitoring a characteristic of the engine which is indicative of engine speed; and retarding the turbocharger when said characteristic indicates that the speed of the engine is greater than a predetermined threshold value in order to reduce the force required from the engine brake to open said exhaust valve when the engine is turning at relatively high speeds.
Claim 11
Independent Claim
118 words
A method of operating a compression release engine braking system which includes a turbocharged internal combustion engine and a compression release engine brake for opening at least one exhaust valve in the engine near top dead center of the compression stroke of the engine piston in the engine cylinder served by that exhaust valve, said method comprising the steps of: monitoring a characteristic of the engine which is indicative of engine speed; and retarding the turbocharger when said characteristic indicates that the speed of the engine is greater than a predetermined threshold value in order to reduce the force required from the engine brake to open said exhaust valve when the engine is turning at relatively high speeds.
Claim 12
Dependent Claim
27 words
The method defined in claim 9 wherein said retarding step comprises the step of: restricting the flow of engine exhaust gas through the turbine of the turbocharger.
Claim 13
Dependent Claim
28 words
The method defined in claim 10 wherein said restricting step comprises the step of: restricting the flow of engine exhaust gas exiting from the turbine of the turbocharger.
Claim 14
Dependent Claim
30 words
The method defined in claim 10 wherein said restricting step comprises the step of: restricting the flow of engine exhaust gas from the engine to the turbine of the turbocharger.
Claim 15
Dependent Claim
29 words
The method defined in claim 9 wherein said retarding step comprises the step of: allowing a portion of the engine exhaust gas to bypass the turbine of the turbocharger.
Claim 16
Dependent Claim
24 words
The method defined in claim 9 wherein said monitoring step comprises the step of: monitoring the pressure of the gas in said intake manifold.
Claim 17
Dependent Claim
20 words
The method defined in claim 9 wherein said monitoring step comprises the step of: monitoring the speed of the engine.
References Cited (Backward Citations)
No citation records indexed.
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