EP0826870A2
Expired / Lapsed
EP
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Apparatus for controlling timings of exhaust valves and method thereof
Assignee: Hitachi Unisia Automotive Ltd
•
Filing: 1997-08-08
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Granted: —
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Expires: 2017-08-08
Abstract
Abstract The timing for opening the exhaust valve (9) is advanced by an angle that varies depending upon the load exerted on an engine (1) and the rotational speed of the engine (1) at the cold starting of the engine (1) during a predetermined period of time after the complete combustion. The heat of combustion is positively discharged into an exhaust system and hence, an oxygen sensor and a catalytic converter disposed in the exhaust system of the engine (1) are activated more quickly.
Inventors
- 👤 Naoki Tomisawa
- 👤 Seizi Suga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 22:29
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/0242; F02D13/0249; F01; F01L; F01L1/00; F01L1/34; F01L1/344; F01L1/34403; F01L1/34406; F02D41/00; F02D41/02; F02D41/021; F02D41/0235; F02D41/024; F01L2201/00; F02D2013/0292; F02D41/0002; F02D2041/001; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
76 words
An apparatus for controlling timings of exhaust valves (9)
comprising a variable valve timing mechanism (10) for varying
timings for opening and closing exhaust valves (9), wherein
said apparatus for controlling timings of exhaust valves (9)
further comprises a valve timing control means (20) for
controlling said variable valve timing mechanism (10) in order
to advance, by a predetermined angle, the timing for opening
the exhaust valve (9) at the time of cold starting an engine.
Claim 2
Dependent Claim
105 words
An apparatus for controlling times of exhaust valves (9)
according to claim 1, wherein said valve timing control means
(20) includes an engine temperature detection means (23) for
detecting the temperature of an engine (1) and a starting state
detection means (25) for detecting the starting state of the
engine (1), and wherein, when the detected engine temperature
at the time of start is equal to or lower than a predetermined
temperature, said variable valve timing mechanism (10) is
controlled in order to advance, by a predetermined angle, the
timing for opening the exhaust valve (9) during a predetermined
period of time after the start.
Claim 3
Dependent Claim
39 words
An apparatus for controlling timings of exhaust valves (9)
according to claim 2, wherein said starting state detection
means (25) detects the state until a predetermined period of
time has elapsed from the complete combustion as a starting
state.
Claim 4
Dependent Claim
46 words
An apparatus for controlling timings of exhaust valves (9)
according to claim 3, wherein said starting state detection
means (25) judges the complete combustion of the engine (1)
when the rotational speed of the engine (1) is equal to or
greater than a predetermined rotational speed.
Claim 5
Dependent Claim
41 words
An apparatus for controlling timings of exhaust valves (9)
according to claim 1, wherein said valve timing control means
(20) advances the timing for opening the exhaust valve (9) only
when the engine (1) is in a predetermined light-load operation
state.
Claim 6
Dependent Claim
44 words
An apparatus for controlling timings of exhaust valves (9)
according to claim 1, wherein said valve timing control means
(20) variably sets a predetermined angle for advancing the
timing for opening the exhaust valve (9) depending upon the
operation conditions of the engine (1).
Claim 7
Dependent Claim
59 words
An apparatus for controlling timings of exhaust valves (9)
according to claim 6, wherein said valve timing control means
(20) variably sets a predetermined angle for advancing the
timing for opening the exhaust valve (9) depending upon the
load exerted on the engine (1) and the rotational speed of the
engine (1) as operation conditions of the engine (1).
Claim 8
Dependent Claim
46 words
An apparatus for controlling timings of exhaust valves (9)
according to claim 1, wherein said valve timing control means
(20) advances the timing for opening the exhaust valve (9) for
only a predetermined period of time depending upon the engine
temperature at the time of start.
Claim 9
Independent Claim
71 words
A method of controlling timings of exhaust valves (9),
comprising a variable valve timing mechanism (10) for varying
the timing for opening and closing an exhaust valve (9),
wherein the timing for opening the exhaust valve (9) is
advanced by a predetermined angle by controlling said variable
valve timing mechanism (10) at the cold starting of an engine
(1) in order to promote the rise of temperature of the exhaust
system.
Claim 10
Dependent Claim
58 words
A method of controlling timings of exhaust valves (9)
according to claim 9, wherein, when the engine temperature is
equal to or lower than a predetermined temperature at the cold
starting of the engine (1), the timing for opening the exhaust
valve (9) is advanced by a predetermined angle during a
predetermined period of time after the start.
Claim 11
Dependent Claim
55 words
A method of controlling timings of exhaust valves (9)
according to claim 10, wherein a state until a predetermined
period of time has elapsed after the complete combustion is
detected as a starting state, and the timing for opening the
exhaust valve (9) is advanced by a predetermined angle a
subsequent predetermined period of time.
Claim 12
Dependent Claim
41 words
A method of controlling timings of exhaust valves (9)
according to claim 11, wherein the complete combustion of the
engine (1) is judged when the rotational speed of the engine
(1) is equal to or greater than a predetermined rotational
speed.
Claim 13
Dependent Claim
36 words
A method of controlling timings of exhaust valves (9)
according to claim 9, wherein the timing for opening the
exhaust valve (9) is advanced only when the engine (1) is in a
predetermined light-load operation condition.
Claim 14
Dependent Claim
39 words
A method of controlling timings of exhaust valves (9)
according to claim 9, wherein a predetermined angle for
advancing the timing for opening the exhaust valve (9) is
variably set depending upon the operation conditions of the
engine (1).
Claim 15
Dependent Claim
54 words
A method of controlling timings of exhaust valves (9)
according to claim 14, wherein a predetermined angle for
advancing the timing for opening the exhaust valve (9) is
variably set depending upon the load exerted on the engine (1)
and the rotational speed of the engine (1) as operation
conditions of the engine (1).
Claim 16
Dependent Claim
41 words
A method of controlling timings of exhaust valves (9)
according to claim 1, wherein the timing for opening the
exhaust valve (9) is advanced for only a predetermined period
of time depending upon the engine temperature at the time of
start.
References Cited (Backward Citations)
No citation records indexed.
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