US3710908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle engine braking system
Assignee: Volvo White Truck Corp
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Filing: 1970-02-19
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Granted: 1973-01-16
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Expires: 1990-02-19
Abstract
Abstract A multiple-position switch is actuated by a throttle pedal that is spring-loaded for retraction from an engine idling position through a series of three successive retracted positions. At the first of the three retracted positions the multiple-position switch terminates combustion in the engine to create a light braking effect which is primarily the result of friction losses in the various moving parts of the engine and vehicle. At the second retracted position of the throttle the switch is effective to create engine braking action by holding the exhaust valves of the engine continuously in slightly open position. At the third retracted position of the throttle pedal the switch operates a butterfly valve in the exhaust manifold of the engine to provide back pressure in the manifold, the additional braking effect by the back pressure unexpectedly increasing the effectiveness of the braking effort by the partially open exhaust valves.
Inventors
- 👤 E Muir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:18
CPC Classifications
B; B60; B60T; B60T1/00; B60T1/12; F; F01; F01L; F01L13/00; F01L13/06; F02; F02D; F02D2700/00; F02D2700/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
In a vehicle having a clutch with the vehicle powered by an internal combustion engine having cylinders with corresponding pistons and having a set of intake valves and a set of exhaust valves in communication with the exhaust manifold, the improvement for operating the engine as a brake for the vehicle, comprising: a first control means to terminate combustion in said cylinders for a braking period; second control means to hold said exhaust valves partially open continuously throughout the braking period; third control means to restrict outflow from the exhaust manifold without completely cutting off the outflow during the braking period thereby to create back pressure in the exhaust manifold; and means responsive to the clutch to prevent operation of said first, second and third control means when the clutch is disengaged.
Claim 2
Dependent Claim
132 words
In a vehicle having a clutch with the vehicle powered by an internal combustion engine having cylinders with corresponding pistons and having a set of intake valves and a set of exhaust valves in communication with the exhaust manifold, the improvement for operating the engine as a brake for the vehicle, comprising: a first control means to terminate combustion in said cylinders for a braking period; second control means to hold said exhaust valves partially open continuously throughout the braking period; third control means to restrict outflow from the exhaust manifold without completely cutting off the outflow during the braking period thereby to create back pressure in the exhaust manifold; and means responsive to the clutch to prevent operation of said first, second and third control means when the clutch is disengaged.
Claim 3
Dependent Claim
212 words
In a vehicle powered by an internal combustion engine through a clutch and a transmission, said engine having a throttle and a plurality of cylinders with corresponding exhaust valves in communication with an exhaust manifold, the improvement for operating the engine as a brake, comprising: said throttle having a range of movement for supplying fuel to the engine at different rates and being retractable from said range to first, second and third retracted positions in a retracted range of positions; first control means to terminate combustion in said cylinders for a braking period; second control means to prevent complete closure of said exhaust valves during the braking period; third control means to restrict outflow from said exhaust manifold thereby to create back pressure in the manifold during the braking period, said first control means being responsive to retraction of the throttle into said retracted range, one of said second and third control means being responsive to retraction of the throttle from said first position to said second and third position, the other of said second and third control means being responsive to retraction of the throttle to said third position; and means responsive to said clutch to prevent operation of said first, second and third control means when the clutch is disengaged.
Claim 4
Dependent Claim
212 words
In a vehicle powered by an internal combustion engine through a clutch and a transmission, said engine having a throttle and a plurality of cylinders with corresponding exhaust valves in communication with an exhaust manifold, the improvement for operating the engine as a brake, comprising: said throttle having a range of movement for supplying fuel to the engine at different rates and being retractable from said range to first, second and third retracted positions in a retracted range of positions; first control means to terminate combustion in said cylinders for a braking period; second control means to prevent complete closure of said exhaust valves during the braking period; third control means to restrict outflow from said exhaust manifold thereby to create back pressure in the manifold during the braking period, said first control means being responsive to retraction of the throttle into said retracted range, one of said second and third control means being responsive to retraction of the throttle from said first position to said second and third position, the other of said second and third control means being responsive to retraction of the throttle to said third position; and means responsive to said clutch to prevent operation of said first, second and third control means when the clutch is disengaged.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |