Patent US4995347A successfully refreshed from Google Patents.
US4995347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake device of a two stroke engine with supercharger bypass passage
Assignee: Toyota Motor Corp
•
Filing: 1989-11-30
•
Granted: 1991-02-26
•
Expires: 2009-11-30
Abstract
Abstract A two stroke engine equipped with a mechanically driven supercharger in the intake passage downstream of throttle valve. A bypass air passage bypassing the supercharger is provided, and a bypass air control valve is arranged in the bypass air passage. When the engine is idling, the bypass air control valve is controlled so that the level of vacuum in the intake passage between the throttle valve and the supercharger is maintained at a constant value.
Inventors
- 👤 Takao Tate
- 👤 Norihiko Nakamura
- 👤 Hiroshi Noguchi
- 👤 Michio Kawagoe
- 👤 Toyokazu Baika
- 👤 Kichiro Kato
- 👤 Yoshio Kido
- 👤 Katsuhiko Hirose
- 👤 Hiroaki Nihei
- 👤 Masahiko Masubuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:43
CPC Classifications
F; F02; F02D; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D31/005; F02B; F02B33/00; F02B33/44; F02B33/446; F02D41/00; F02D41/0002; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; F02D2400/00; F02D2400/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
143 words
An intake device of a two stroke engine; comprising: an intake passage having a throttle valve therein; a mechanically driven supercharger driven by the engine and arranged in said intake passage downstream of said throttle valve; a bypass air passage branched from said intake passage between said throttle valve and said supercharger and connected to said intake passage downstream of said supercharger; a bypass air control valve arranged in said bypass air passage; detecting means for detecting a level of vacuum in said intake passage between said throttle valve and said supercharger and producing an output signal representing said level of vacuum; and bypass control means for controlling a degree of opening of said bypass air control valve in response to the output signal of said detecting means to bring said level of vacuum to a predetermined level when the engine is idling.
Claim 2
Dependent Claim
143 words
An intake device of a two stroke engine; comprising: an intake passage having a throttle valve therein; a mechanically driven supercharger driven by the engine and arranged in said intake passage downstream of said throttle valve; a bypass air passage branched from said intake passage between said throttle valve and said supercharger and connected to said intake passage downstream of said supercharger; a bypass air control valve arranged in said bypass air passage; detecting means for detecting a level of vacuum in said intake passage between said throttle valve and said supercharger and producing an output signal representing said level of vacuum; and bypass control means for controlling a degree of opening of said bypass air control valve in response to the output signal of said detecting means to bring said level of vacuum to a predetermined level when the engine is idling.
Claim 3
Dependent Claim
15 words
An intake device according to claim 1, wherein said predetermined level is about -100 mmHg.
Claim 4
Dependent Claim
31 words
An intake device according to claim 1, further comprising throttle control means for controlling a degree of opening of said throttle valve in response to a depression of an accelerator pedal.
Claim 5
Dependent Claim
87 words
An intake device according to claim 3, wherein said throttle control means controls said throttle valve in response to the depression of said accelerator pedal to equalize the degree of opening of said throttle valve with a predetermined first degree of opening, and said bypass control means controls said bypass air control valve in response to the depression of said accelerator pedal to equalize the degree of opening of said bypass air control valve to a predetermined second degree of opening when said accelerator pedal is depressed.
Claim 6
Dependent Claim
85 words
An intake device according to claim 4, wherein said predetermined first degree of opening is increased from a minimum degree of opening to a first desired throttle degree of opening as the depression of said accelerator pedal is increased from zero to a predetermined first depression, and said predetermined second degree of opening is increased from a basic degree of opening to a first desired bypass degree of opening as the depression of said accelerator pedal is increased from zero to said predetermined first depression.
Claim 7
Dependent Claim
19 words
An intake device according to claim 5, wherein said minimum degree of opening of said throttle valve is zero.
Claim 8
Dependent Claim
39 words
An intake device according to claim 5, wherein said basic degree of opening of said bypass air control valve is approximately equal to the degree of opening of said bypass air control valve maintained when the engine is idling.
Claim 9
Dependent Claim
33 words
An intake device according to claim 5, wherein said predetermined second degree of opening is increased at a rate which is lower than an increasing rate of said predetermined first degree of opening.
Claim 10
Dependent Claim
72 words
An intake device according to claim 5, wherein said predetermined first degree of opening is maintained at said first desired throttle degree of opening while the depression of said accelerator pedal is increased from said predetermined first depression to a predetermined second depression, and said predetermined second degree of opening is gradually decreased while the depression of said accelerator pedal is increased from said predetermined first depression to said predetermined second depression.
Claim 11
Dependent Claim
68 words
An intake device according to claim 9, wherein said predetermined first degree of opening is increased from said first desired throttle degree of opening to a maximum degree of opening as the depression of said accelerator pedal is increased after exceeding said predetermined second depression, and said predetermined second degree of opening is decreased to zero after the depression of said accelerator pedal exceeds said predetermined second depression.
Claim 12
Dependent Claim
119 words
An intake device according to claim 5, further comprising a pressure sensor for detecting a charging pressure in said intake passage downstream of said super charger and for producing an output signal representing said charging pressure, wherein said first desired throttle degree of opening is a maximum degree of opening, and said predetermined first degree of opening is maintained at said maximum degree of opening when the depression of said accelerator pedal exceeds said predetermined first depression, said bypass control means controlling said bypass air control valve in response to the output signal of said pressure sensor to equalize said charging pressure with a predetermined charging pressure when the depression of said accelerator pedal exceeds said predetermined first depression.
Claim 13
Dependent Claim
23 words
An intake device according to claim 11, wherein said predetermined charging pressure is increased as the depression of said accelerator pedal is increased.
Claim 14
Dependent Claim
46 words
An intake device according to claim 4, wherein the relationship between said predetermined first degree of opening and the depression of said acceleration pedal and the relationship between said predetermined second degree of opening and the depression of said accelerator pedal are stored in a memory.
Claim 15
Dependent Claim
63 words
An intake device according to claim 4, wherein said throttle control means comprises an actuator for actuating said throttle valve, and a potentiometer for detecting the degree of opening of said throttle valve, and said bypass control valve comprises an actuator for actuating said bypass air control valve, and a potentiometer for detecting the degree of opening of said bypass air control valve.
Claim 16
Dependent Claim
48 words
An intake device according to claim 1, further comprising temperature detecting means for detecting a temperature which has an influence on the combustion of the engine and producing an output signal representing said temperature, wherein said predetermined level is changed in accordance with a change in said temperature.
Claim 17
Dependent Claim
14 words
An intake device according to claim 15, wherein said temperature is the engine temperature.
Claim 18
Dependent Claim
15 words
An intake device according to claim 15, wherein said temperature is the outside air temperature.
Claim 19
Dependent Claim
49 words
An intake device according to claim 15, wherein said predetermined level is a first level at which said temperature is higher than a predetermined temperature, and said predetermined level is a second level which is greater than said first level when said temperature is lower than said predetermined level.
Claim 20
Dependent Claim
23 words
An intake device according to claim 18, wherein said first level is about -100 mmHg, and said second level is about -200 mmHg.
Claim 21
Dependent Claim
31 words
An intake device according to claim 18, further comprising throttle control means for controlling a degree of opening of said throttle valve in response to a depression of an accelerator pedal.
Claim 22
Dependent Claim
187 words
An intake device according to claim 20, wherein said throttle control means controls said throttle valve in response to the depression of said accelerator pedal and the output signal of said temperature detecting means to bring the degree of opening of said throttle valve to a predetermined first degree of opening when said temperature is higher than said predetermined temperature and to bring the degree of opening of said throttle valve to a predetermined third degree of opening when said temperature is lower than said predetermined temperature, and said bypass control means controls said bypass air control valve in response to the depression of said accelerator pedal and the output signal of said temperature detecting means to bring the degree of opening of said bypass air control valve to a predetermined second degree of opening when said accelerator pedal is depressed and when said temperature is higher than said predetermined temperature and to bring the degree of opening of said bypass air control valve to a predetermined fourth degree of opening when said accelerator pedal is depressed and when said temperature is lower than said predetermined temperature.
Claim 23
Dependent Claim
85 words
An intake device according to claim 21, wherein said predetermined first degree of opening is increased from a minimum degree of opening to a first desired throttle degree of opening as the depression of said accelerator pedal is increased from zero to a predetermined first depression, and said predetermined second degree of opening is increased from a basic degree of opening to a first desired bypass degree of opening as the depression of said accelerator pedal is increased from zero to said predetermined first depression.
Claim 24
Dependent Claim
19 words
An intake device according to claim 22, wherein said minimum degree of opening of said throttle valve is zero.
Claim 25
Dependent Claim
49 words
An intake device according to claim 22, wherein said basic degree of opening of said bypass air control valve is approximately equal to the degree of opening of said bypass air control valve maintained when the engine is idling and when said temperature is higher than said predetermined temperature.
Claim 26
Dependent Claim
33 words
An intake device according to claim 22, wherein said predetermined second degree of opening is increased at a rate which is lower than an increasing rate of said predetermined first degree of opening.
Claim 27
Dependent Claim
72 words
An intake device according to claim 22, wherein said predetermined first degree of opening is maintained at said first desired throttle degree of opening while the depression of said accelerator pedal is increased from said predetermined first depression to a predetermined second depression, and said predetermined second degree of opening is gradually decreased while the depression of said accelerator pedal is increased from said predetermined first depression to said predetermined second depression.
Claim 28
Dependent Claim
67 words
An intake device according to claim 26, wherein said predetermined first degree of opening is increased from said first desired throttle degree of opening to a maximum degree of opening as the depression of said accelerator pedal is increased after exceeding said predetermined second depression, and said predetermined second degree of opening decreased to zero after the depression of said accelerator pedal exceeds said predetermined second depression.
Claim 29
Dependent Claim
117 words
An intake device according to claim 22, further comprising a pressure sensor for detecting a charging pressure in said intake passage downstream of said supercharger and for producing an output signal representing said charging pressure, wherein said first desired throttle degree of opening is a maximum degree of opening, and said predetermined first degree of opening is maintained at said maximum opening degree when the depression of said accelerator pedal exceeds said predetermined first depression, said bypass control means controlling said bypass air control valve in response to the output signal of said pressure sensor to equalize said charging pressure with a predetermined charging pressure when the depression of said accelerator pedal exceeds said predetermined first depression.
Claim 30
Dependent Claim
23 words
An intake device according to claim 28, wherein said predetermined charging pressure is increased as the depression of said accelerator pedal is increased.
Claim 31
Dependent Claim
74 words
An intake device according to claim 21, wherein said predetermined third degree of opening is increased from a minimum degree of opening to a desired throttle degree of opening as the depression of said accelerator pedal is increased from zero to a predetermined depression, and said predetermined fourth degree of opening is decreased from a basic degree of opening as the depression of said accelerator pedal is increased from zero to said predetermined depression.
Claim 32
Dependent Claim
22 words
An intake device according to claim 30, wherein said minimum degree of opening of said throttle valve is a predetermined small degree.
Claim 33
Dependent Claim
49 words
An intake device according to claim 30, wherein said basic degree of opening of said bypass air control valve is approximately equal to the degree of opening of said bypass air control valve, maintained when the engine is idling and when said temperature is lower than said predetermined temperature.
Claim 34
Dependent Claim
65 words
An intake device according to claim 30, wherein said predetermined third degree of opening is increased from said desired throttle degree of opening to a maximum degree of opening as the depression of said accelerator pedal is increased after exceeding said predetermined depression, and said predetermined fourth degree of opening is decreased to zero after the depression of said accelerator pedal exceeds said predetermined depression.
Claim 35
Dependent Claim
115 words
An intake device according to claim 30, further comprising a pressure sensor for detecting a charging pressure in said intake passage downstream of said supercharger and for producing an output signal representing said charging pressure, wherein said desired throttle degree of opening is a maximum degree of opening, and said predetermined third degree of opening is maintained at said maximum degree of opening when the depression of said accelerator pedal exceeds said predetermined depression, said bypass control means controlling said bypass air control valve in response to the output signal of said pressure sensor to equalize said charging pressure with a predetermined charging pressure when the depression of said accelerator pedal exceed said predetermined depression.
Claim 36
Dependent Claim
23 words
An intake device according to claim 34, wherein said predetermined charging pressure is increased as the depression of said accelerator pedal is increased.
Claim 37
Dependent Claim
80 words
An intake device according to claim 21, wherein the relationship between said predetermined first degree of opening degree opening and the depression of said acceleration pedal, the relationship between said predetermined second degree of opening and the depression of said accelerator pedal, the relationship between said predetermined third degree of opening and the depression of said acceleration pedal and the relationship between said predetermined fourth degree of opening and the depression of said accelerator pedal are stored in a memory.
Claim 38
Dependent Claim
63 words
An intake device according to claim 21, wherein said throttle control means comprises an actuator for actuating said throttle valve, and a potentiometer for detecting the degree of opening of said throttle valve, and said bypass control valve comprises an actuator for actuating said bypass air control valve, and a potentiometer for detecting the degree of opening of said bypass air control valve.
References Cited (Backward Citations)
US2935053A
Cited
JPS4871204A
Cited
JPS5847119A
Cited
US4702219A
Cited
JPS6183460A
Cited
JPS6293128A
Cited
JPS6257733A
Cited
JPS6275040A
Cited
JPS6295137A
Cited
JPS6295136A
Cited
JPS6295135A
Cited
US4709682A
Cited
JPS63130631A
Cited
JPS63130632A
Cited
JPS63134133A
Cited
JPS63132840A
Cited
US4932368A
Cited
US4907549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |