Patent EP0287038A2 successfully refreshed from Google Patents.
EP0287038A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Exhaust- timing controlling device and method for an internal combustion engine
Assignee: Honda Motor Co Ltd
•
Filing: 1988-04-12
•
Granted: —
•
Expires: 2008-04-12
Abstract
Abstract An exhaust timing controlling device for a two-cycle engine CHARACTERIZED BY a control valve (11) provided in an upper portion of an exhaust passage (5) in a position close to an exhaust port (7), said control valve (11) functioning to open and close an upper portion of the exhaust port (7) to substantially move the upper end position of the exhaust port (7) vertically; an engine speed detecting means (14) for detecting the number of revolutions of the engine; a drive means (20) for opening and closing said control valve (11); and a controller (13) which is connected electrically to both said drive means (20) and said engine speed detecting means (14) and which provides a first signal to the drive means (20) to close the control valve (11) when the engine speed is in a low revolution range (<A) or open the control valve (11) when the engine speed is in a high revolution range (>D), in accordance with a signal provided from said engine speed detecting means (14), and provides a second signal to said drive means (20) in preference to said first signal to let the control valve (11) occupy a predetermined intermediate opening position (m) or a fully closed position forcibly temporarily when a combustion chamber of the engine is about to assume a preset condition in which the temperature of the combustion chamber exceeds a predetermined level.
Inventors
- 👤 Hitoshi Yamamoto
- 👤 Masayuki Toriyama
- 👤 Masahiko Ikegami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 11:03
CPC Classifications
F; F02; F02D; F02D13/00; F02D13/02; F02D13/028; F02D13/0284; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
232 words
An exhaust timing controlling device for a two-cycle engine CHARACTERIZED BY a control valve (11) provided in an upper portion of an exhaust passage (5) in a position close to an exhaust port (7), said control valve (11) functioning to open and close an upper portion of the exhaust port (7) to substantially move the upper end position of the exhaust port (7) vertically; an engine speed detecting means (14) for detecting the number of revolutions of the engine; a drive means (12) for opening and closing said control valve (11); and a controller (13) which is connected electrically to both said drive means (12) and said engine speed detecting means (14) and which provides a first signal to the drive means (12) to close the control valve (11) when the engine speed is in a low revolution range (<A) or open the control valve (11) when the engine speed is in a high revolution range (>D), in accordance with a signal provided from said engine speed detecting means (14), and provides a second signal to said drive means (12) in preference to said first signal to let the control valve (11) occupy a predetermined intermediate opening position (m) or a fully closed position forcibly temporarily when a combustion chamber of the engine is about to assume a preset condition in which the temperature of the combustion chamber exceeds a predetermined level.
Claim 2
Dependent Claim
232 words
An exhaust timing controlling device for a two-cycle engine CHARACTERIZED BY a control valve (11) provided in an upper portion of an exhaust passage (5) in a position close to an exhaust port (7), said control valve (11) functioning to open and close an upper portion of the exhaust port (7) to substantially move the upper end position of the exhaust port (7) vertically; an engine speed detecting means (14) for detecting the number of revolutions of the engine; a drive means (12) for opening and closing said control valve (11); and a controller (13) which is connected electrically to both said drive means (12) and said engine speed detecting means (14) and which provides a first signal to the drive means (12) to close the control valve (11) when the engine speed is in a low revolution range (<A) or open the control valve (11) when the engine speed is in a high revolution range (>D), in accordance with a signal provided from said engine speed detecting means (14), and provides a second signal to said drive means (12) in preference to said first signal to let the control valve (11) occupy a predetermined intermediate opening position (m) or a fully closed position forcibly temporarily when a combustion chamber of the engine is about to assume a preset condition in which the temperature of the combustion chamber exceeds a predetermined level.
Claim 3
Dependent Claim
49 words
The exhaust timing controlling device as set forth in claim 1 characterized in that the first signal is operating the control valve (11) in an opening direction when the engine speed is in a low revolution range (A - C) which is within several thousand revolutions, including idling revolutions.
Claim 4
Dependent Claim
53 words
The exhaust timing controlling device as set forth in either of the claims 1 and 2 characterized in that the first signal is operating the control valve (11) in a closing direction when the engine speed has reached a medium revolution range (C - D) beyond the low revolution range (A - C).
Claim 5
Dependent Claim
49 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the first signal is operating the control valve (11) in an opening direction when the engine speed has reached a high revolution range (>D) beyond the medium revolution range (C - D).
Claim 6
Dependent Claim
63 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the second signal is moving the control valve (11) back to an intermediate opening position (m) temporarily when the engine has been retained for over a certain time in a high revolution range (F - I) including revolutions (H) at which the maximum output is exhibited.
Claim 7
Dependent Claim
111 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the first signal is operating the control valve (11) to occupy the fully closed position when the engine speed is below the minimum revolution (A) of the low revolution range (A - C) to occupy an intermediate opening position (n) when the engine speed is between the minimum revolution (A) and a given medium revolution (B) in the low revolution range (A - C) and to assume the fully open position when the engine speed is between the medium revolution (B) and the maximum revolution (C) of the low revolution range (A - C).
Claim 8
Dependent Claim
45 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the first signal is operating the control valve (11) to assume the fully closed position when the engine speed is in the medium revolution range (C - D).
Claim 9
Dependent Claim
57 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the first signal is operating the control valve (11) gradually from the fully closed position toward the fully open position according to the number of revolutions of the engine when the engine speed is in the high revolution range (>D).
Claim 10
Dependent Claim
47 words
The exhaust timing controlling device as set forth in claim 8 characterized in that the first signal is operating the control valve (11) to assume the fully open position when the engine speed has reached a given speed (G) or higher in the high revolution range (>D).
Claim 11
Dependent Claim
112 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the second signal is operating the control valve (11) to a predetermined intermediate opening position (m) when the engine speed has been held in a predetermined high revolution range ( F - I) including revolutions (G) at which the maximum engine output is exhibited, for a predetermined period of time, or when a predetermined time has elapsed from the time when the engine speed entered the above revolution range (F - I) until when it again entered the same range (F - I) after having once got out of the said range (F - I).
Claim 12
Dependent Claim
74 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the second signal is terminated when the engine speed has decreased below a revolution (E) which corresponds to the state of the control valve (11) occupying the predetermined intermediate opening position (m) or when the engine speed has increased above a predetermined level (I) higher than the revolutions (G) at which the maximum engine output is exhibited.
Claim 13
Dependent Claim
39 words
The exhaust timing controlling device as set forth in any of the preceding claims characterized in that the second signal is inhibited when a throttle opening determining the output of the engine is smaller than a predetermined value (M).
Claim 14
Independent Claim
78 words
A method of controlling a vehicular internal combustion engine (101) capable of controlling the intake or exhaust timing ϑ V characterized in that when a load above a predetermined value is imposed on the engine (101), the intake or exhaust timing (ϑ V ) is deviated gradually from a maximum output generation timing (ϑ T ) which is set on the basis of operation parameters (N e , ϑ TH , F K ) of the engine (101).
Claim 15
Independent Claim
78 words
A method of controlling a vehicular internal combustion engine (101) capable of controlling the intake or exhaust timing ϑ V characterized in that when a load above a predetermined value is imposed on the engine (101), the intake or exhaust timing (ϑ V ) is deviated gradually from a maximum output generation timing (ϑ T ) which is set on the basis of operation parameters (N e , ϑ TH , F K ) of the engine (101).
Claim 16
Dependent Claim
95 words
The method of claim 13 characterized by setting the intake or exhaust timing (ϑ V ) to a maximum output generation timing (ϑ T ) at which there is obtained a maximum output, on the basis of said operation parameters (N e , ϑ TH , F K ) of said internal combustion engine (101); detecting a high load condition above a predetermined load on the engine (101); and deviating the intake or exhaust timing (ϑ V ) gradually from the maximum output generation timing (ϑ T ) upon detection of said high load condition.
Claim 17
Independent Claim
29 words
The method of either of the claims 13 and 14 characterized in that said operation parameters are throttle valve opening (ϑ TH ) and engine speed (N e ).
Claim 18
Independent Claim
28 words
The method of either of the claims 13 and 14 characterized in that said operation parameters are throttle valve opening (ϑ TH ) and knocking (F K ).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.