EP0334228A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Air supply control systems for internal combustion engines
Assignee: Mazda Motor Corp
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Filing: 1989-03-17
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Granted: —
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Expires: 2009-03-17
Abstract
Abstract An air supply control system for an internal combustion engine comprises a plurality of superchargers (B7,B8;6,7;109,110) including a turbosupercharger, an exhaust cutoff valve (B4;21;111) operative selectively to open and close an exhaust passage (5;102b) in which a turbine (9; Ts) of the turbosupercharger is disposed, an intake air cutoff valve (B5;32;121) operative selectively to open and close an intake passage (14;103b) in which a blower (15;Cs) of the turbosupercharger is disposed, an intake air relief valve (B6;37;123) operative selectively to open and close a relief passage (36;122) provided for detouring the blower of the turbosupercharger, an engine operation detector (B1;3,50, 41;104,161,135) for detecting operating conditions of the engine, a cutoff valve controller (B2;29,30,31,33,34,35,41; 119,128,129,124,126,127,135) operative, in response to the detection output from the engine operation detector, to cause both the exhaust cutoff valve and the intake air cutoff valve to be closed when intake air mass flow fed to the engine is to be relatively small and to cause both the exhaust cutoff valve and the intake air cutoff valve to be open when the intake air mass flow fed to the engine is to be relatively large, and a relief valve controller (B3;37a,38,39,41;125,130, 131,135) operative, in response to the detection output from the engine operation detector, to cause the intake air relief valve to be closed at a time point not later than another time point at which the exhaust cutoff valve is fully opened.
Inventors
- 👤 Seji Tashima
- 👤 Haruo Okimoto
- 👤 Toshimichi Akagi
- 👤 Yasushi Niwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 21:34
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0002; F02D41/0007; F02B; F02B37/00; F02B37/007; F02B37/12; F02B37/16; F02B37/18; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
375 words
An air supply control system for an internal combustion engine comprising: a plurality of superchargers (B7,B8;6,7;109,110) including at least a first supercharger (B7;6;109) and a second supercharger (B8;7;110) which is constituted as a turbosupercharger having a turbine (9;Ts) disposed in one of separated exhaust passages (4,5;102a,102b) connected with the engine (B9;1;101) and a blower (15;Cs) connected through a shaft (7′;Ls) with the turbine and disposed in one of separated intake passages (12,14;103a,103b) connected with the engine, an exhaust cutoff valve (B4;21;111) operative selectively to be open and closed respectively for opening and closing the separated exhaust passage in which the turbine of said second supercharger is disposed, an intake air cutoff valve (B5;37;121) operative selectively to be open and closed respectively for opening and closing the separated intake passage in which the blower of said second supercharger is disposed, an intake air relief valve (B6;37;123) operative selectively to be open and closed respectively for opening and closing a relief passage (36;123) which is provided to the separated intake passage in which the blower of said second supercharger is disposed for detouring the blower of said second supercharger, engine operation detecting means (B1;3,50,41;104,161,135) for detecting operating conditions of the engine to produce a detection output, and cutoff valve control means (B2;29,30,31,33,34,35,41; 119,128,129,124,126,127,135) operative, in response to the detection output from said engine operation detecting means, to cause both said exhaust cutoff valve and said intake air cutoff valve to be closed so that said first supercharger works for supercharging the engine but said second supercharger is restrained from supercharging the engine when intake air mass flow fed to the engine is to be relatively small and to cause both said exhaust cutoff valve and said intake air cutoff valve to be open so that both of said first and second superchargers work simultaneously for supercharging the engine when the intake air mass flow fed to the engine is to be relatively large, characterized by relief valve control means (B3;37a,38,39,41;125, 130,131,135) operative, in response to the detection output from said engine operation detecting means (B1;3,50,41;104, 161,135), to cause said intake air relief valve (B6;37;123) to be closed at a time point not later than another time point at which said exhaust cutoff valve (B4;21;111) is fully opened.
Claim 2
Dependent Claim
375 words
An air supply control system for an internal combustion engine comprising: a plurality of superchargers (B7,B8;6,7;109,110) including at least a first supercharger (B7;6;109) and a second supercharger (B8;7;110) which is constituted as a turbosupercharger having a turbine (9;Ts) disposed in one of separated exhaust passages (4,5;102a,102b) connected with the engine (B9;1;101) and a blower (15;Cs) connected through a shaft (7′;Ls) with the turbine and disposed in one of separated intake passages (12,14;103a,103b) connected with the engine, an exhaust cutoff valve (B4;21;111) operative selectively to be open and closed respectively for opening and closing the separated exhaust passage in which the turbine of said second supercharger is disposed, an intake air cutoff valve (B5;37;121) operative selectively to be open and closed respectively for opening and closing the separated intake passage in which the blower of said second supercharger is disposed, an intake air relief valve (B6;37;123) operative selectively to be open and closed respectively for opening and closing a relief passage (36;123) which is provided to the separated intake passage in which the blower of said second supercharger is disposed for detouring the blower of said second supercharger, engine operation detecting means (B1;3,50,41;104,161,135) for detecting operating conditions of the engine to produce a detection output, and cutoff valve control means (B2;29,30,31,33,34,35,41; 119,128,129,124,126,127,135) operative, in response to the detection output from said engine operation detecting means, to cause both said exhaust cutoff valve and said intake air cutoff valve to be closed so that said first supercharger works for supercharging the engine but said second supercharger is restrained from supercharging the engine when intake air mass flow fed to the engine is to be relatively small and to cause both said exhaust cutoff valve and said intake air cutoff valve to be open so that both of said first and second superchargers work simultaneously for supercharging the engine when the intake air mass flow fed to the engine is to be relatively large, characterized by relief valve control means (B3;37a,38,39,41;125, 130,131,135) operative, in response to the detection output from said engine operation detecting means (B1;3,50,41;104, 161,135), to cause said intake air relief valve (B6;37;123) to be closed at a time point not later than another time point at which said exhaust cutoff valve (B4;21;111) is fully opened.
Claim 3
Dependent Claim
60 words
An air supply control system according to claim 1, characterized in that said first supercharger (7) is constituted as a turbosupercharger having a turbine (9; Ts) disposed in another of the separated exhaust passages (5;102b) and a blower (15;Cs) connected through a shaft (7′;Ls) with the turbine (9; Ts) and disposed in another one of the separated intake passages (14,103b).
Claim 4
Dependent Claim
88 words
An air supply control system according to claim 1 or 2, characterized in that said cutoff valve control means and said relief valve control means are operative to detect, based on the detection output from said engine operation detecting means, one of predetermined operating areas provided on an operating characteristic chart of the engine in which an actual operating condition of the engine resides and to control respectively said exhaust cutoff valve (B4, 21;111) and said intake air relief valve (B6;37;123) in accordance with the detected operating area.
Claim 5
Dependent Claim
35 words
An air supply control system according to claim 3, characterized in that said operating characteristic chart shows the operating areas on a coordinate plane defined by coordinate axes representing respectively engine speed and engine load.
Claim 6
Dependent Claim
37 words
An air supply control system according to claim 4, characterized in that said engine load defining the coordinate plane shown by the operating characteristic chart is embodied by the intake air mass flow fed to the engine.
Claim 7
Dependent Claim
57 words
An air supply control system according to anyone of claims 1 to 5, characterized in that said cutoff valve control means and said relief valve control means are operative to cause said intake air cutoff valve (B5;37;121) to open at a time point later than the time point at which said intake relief valve (B6;37;123) is closed.
Claim 8
Dependent Claim
43 words
An air supply control system according to anyone of claims 1 to 6, characterized in that said cutoff valve control means is operative to cause said intake air cutoff valve (B5;37;121) to be delayed to open compared with said exhaust cutoff valve (B4;21;111).
Claim 9
Dependent Claim
54 words
An air supply control system according to claims 3 and 7, characterized in that said cutoff valve control means and said relief valve control means are operative to control respectively said exhaust (B4;21;111) and intake air cutoff valves (B5;37;121) and said intake air relief valve (B6;37; 123) in accordance with the detected operating area.
Claim 10
Dependent Claim
63 words
An air supply control system according to anyone of claims 1 to 8, characterized by exhaust snifting means (26,28;113,114) for supplying the turbine (9;Ts) of said second supercharger (7;110), before said exhaust cutoff valve (21;111) is fully opened, with exhaust gas flow smaller than that supplied to the turbine (9;Ts) of said second supercharger (7;110) through said exhaust cutoff valve (21;111) fully opened.
Claim 11
Dependent Claim
68 words
An air supply control system according to claim 9, characterized in that said exhaust snifting means comprises an exhaust snifting passage (26;114) provided to the separated exhaust passage in which the turbine (9;Ts) of said second supercharger (7;110) for detouring said exhaust cutoff valve (21;111) and an exhaust snifting valve (28;113) provided in said exhaust snifting passage (26;114) for opening and closing selectively said exhaust snifting passage (26;114).
Claim 12
Dependent Claim
44 words
An air supply control system according to claim 9 or 10, characterized in that said exhaust snifting means is operative to supply the turbine (9;Ts) of said second super-charger (7;110) with the exhaust gas flow before said intake air relief valve (27;123) is closed.
Claim 13
Dependent Claim
65 words
An air supply control system according to anyone of claims 1 to 11, characterized in that said relief valve control means is operative to advance the time point at which the intake air relief valve (B6;37;123) is closed before said exhaust cutoff valve (B4;21;111) is fully opened when the detection output from said engine operation detecting means represents that the engine is rather rapidly accelerated.
Claim 14
Dependent Claim
60 words
An air supply control system according to anyone of claims 10 to 12, characterized in that said exhaust snifting valve (28;113) is operative to be opened when an air pressure in at least another one of the separated intake passages (12;103a) at a position downstream to the first supercharger (6;109) takes a pressure value higher than a predetermined pressure value.
References Cited (Backward Citations)
No citation records indexed.
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