US6095116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling negative pressure in internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1997-06-24
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Granted: 2000-08-01
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Expires: 2017-06-24
Abstract
Abstract An improved apparatus controls negative pressure in a combustion engine. The apparatus has a brake booster that is capable of increasing braking force of a vehicle by means of the negative pressure in the brake booster. A valve disposed in an air intake pressure generates the negative pressure that is supplied to the brake booster. An electric control unit controls the valve when pressure in the brake booster is in excess of a predetermined magnitude.
Inventors
- 👤 Souichi Matsushita
- 👤 Mitsuru Takada
- 👤 Yukio Yoshioka
- 👤 Jun Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:53
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/02; B60T13/00; B60T13/10; B60T13/24; B60T13/46; B60T13/52; F; F02; F02D; F02D41/00; F02D41/0002; F02D41/0005; F02D41/30; F02D41/32; F02B; F02B75/00; F02B75/12; F02B2075/125; F02D9/00; F02D9/02; F02D2009/0201; F02D2009/024; F02D2200/00; F02D2200/50; F02D2200/501; F02D2200/70; F02D2200/703; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
81 words
An apparatus for controlling negative pressure in a combustion engine, wherein said apparatus has a brake booster capable of increasing braking force of a vehicle based on the negative pressure supplied to an interior of the brake booster, said apparatus comprising: means for generating the negative pressure that is supplied to the brake booster; and means for controlling the generating means, said controlling means actuating the generating means when pressure in the brake booster is in excess of a predetermined magnitude.
Claim 2
Independent Claim
81 words
An apparatus for controlling negative pressure in a combustion engine, wherein said apparatus has a brake booster capable of increasing braking force of a vehicle based on the negative pressure supplied to an interior of the brake booster, said apparatus comprising: means for generating the negative pressure that is supplied to the brake booster; and means for controlling the generating means, said controlling means actuating the generating means when pressure in the brake booster is in excess of a predetermined magnitude.
Claim 3
Dependent Claim
19 words
The apparatus as set forth in claim 1, further comprising means for detecting pressure acting in the brake booster.
Claim 4
Dependent Claim
43 words
The apparatus as set forth in claim 2, wherein said detecting means detects the pressure acting in the brake booster as an absolute pressure, wherein the control means actuates the generating means when the absolute pressure is in excess of the predetermined magnitude.
Claim 5
Dependent Claim
63 words
The apparatus as set forth in claim 2, further comprising: said detecting means including first sensor for detecting atmosphere pressure and a second sensor for detecting absolute pressure acting in the brake booster; means for computing a difference between the atmosphere pressure and the absolute pressure; and said control means actuating the generating means when the difference is smaller than the predetermined magnitude.
Claim 6
Dependent Claim
51 words
The apparatus as set forth in claim 1, further comprising: an air intake passage for supplying air to the engine; a valve disposed in the air intake passage to control airflow rate therein; and an actuator for actuating the valve, said actuator forms the generating mean in cooperation with the valve.
Claim 7
Dependent Claim
15 words
The apparatus as set forth in claim 5, wherein said valve includes a throttle valve.
Claim 8
Dependent Claim
74 words
The apparatus as set forth in claim 6, further comprising: means for detecting an operation state of the engine; first calculating means for calculating an opening size of the throttle valve based on the operation state of engine; second calculating means for calculating a correction value that corrects the opening size of the throttle valve calculated by the first calculating means; and said control means actuating the actuator based on the calculated correction value.
Claim 9
Dependent Claim
89 words
The apparatus as set forth in claim 7, further comprising: an injection valve for injecting fuel to the engine; means for computing a time period for which the injection valve is open, wherein said computing means performs the computing operation based on the operation state of the engine; first determining means for determining a stable operation of the engine when the opening time period is greater than a predetermined time period; and second determining means for determining the pressure in the brake booster being greater than the predetermined magnitude.
Claim 10
Dependent Claim
30 words
The apparatus as set forth in claim 8, wherein said second calculating means calculates the correction value based on engine speed and the opening time period of the injection valve.
Claim 11
Dependent Claim
59 words
The apparatus an set forth in claim 7, further comprising: means for counting for a predetermined time period after the engine has started to operate; means for comparing the pressure acting in the brake booster with the predetermined magnitude; and said comparing means including means for determining the pressure in the brake booster being greater than the predetermined magnitude.
Claim 12
Dependent Claim
22 words
The apparatus as met forth in claim 10, wherein said second calculating means calculates the correction value based on the engine speed.
Claim 13
Dependent Claim
30 words
The apparatus as set forth in claim 7, wherein said engine is capable of performing a stratified charge combustion, and wherein said control means functions during the stratified charge combustion.
Claim 14
Dependent Claim
27 words
The apparatus as set forth in claim 5, wherein said air intake passage has a diverged passage and wherein said valve includes an idle speed control valve.
Claim 15
Independent Claim
169 words
An apparatus for controlling brake force of a vehicle movable based on rotation of an engine with a plurality of cylinders, each of said cylinders having a combustion chamber that receives fuel from a fuel injector and air from an air intake passage, wherein said air and fuel are mixed and combusted in the combustion chamber, wherein said engine selectively performs a stratified charge combustion and a uniform charge combustion, and wherein said stratified charge combustion mode is selected to increase the amount of the air and the fuel supplied to the engine and improve a combusting state of the engine, said apparatus comprising: a brake booster capable of increasing braking force of a vehicle by means of the negative pressure supplied to an interior of the brake booster; means for generating the negative pressure that is supplied to the brake booster; and means for controlling the generating means, said controlling means actuating the generating means when pressure in the brake booster is in excess of a predetermined magnitude.
Claim 16
Independent Claim
169 words
An apparatus for controlling brake force of a vehicle movable based on rotation of an engine with a plurality of cylinders, each of said cylinders having a combustion chamber that receives fuel from a fuel injector and air from an air intake passage, wherein said air and fuel are mixed and combusted in the combustion chamber, wherein said engine selectively performs a stratified charge combustion and a uniform charge combustion, and wherein said stratified charge combustion mode is selected to increase the amount of the air and the fuel supplied to the engine and improve a combusting state of the engine, said apparatus comprising: a brake booster capable of increasing braking force of a vehicle by means of the negative pressure supplied to an interior of the brake booster; means for generating the negative pressure that is supplied to the brake booster; and means for controlling the generating means, said controlling means actuating the generating means when pressure in the brake booster is in excess of a predetermined magnitude.
Claim 17
Dependent Claim
19 words
The apparatus as set forth in claim 14, further comprising means for detecting pressure acting in the brake booster.
Claim 18
Dependent Claim
43 words
The apparatus as set forth in claim 15, wherein said detecting means detects the pressure acting in the brake booster as an absolute pressure, wherein the control means actuates the generating means when the absolute pressure is in excess or the predetermined magnitude.
Claim 19
Dependent Claim
63 words
The apparatus as set forth in claim 14, further comprising: said detecting means including first sensor for detecting atmosphere pressure and a second sensor for detecting absolute pressure acting in the brake booster; means for computing a difference between the atmosphere pressure and the absolute pressure; and said control means actuating the generating means when the difference is smaller than the predetermined magnitude.
Claim 20
Dependent Claim
41 words
The apparatus as set forth in claim 14, further comprising: a valve disposed in the air intake passage to control airflow rate therein; and an actuator for actuating the valve, said actuator forms the generating means in cooperation with the valve.
Claim 21
Dependent Claim
15 words
The apparatus as set forth in claim 18, wherein said valve includes a throttle valve.
Claim 22
Dependent Claim
74 words
The apparatus as set forth in claim 19, further comprising: means for detecting an operation state of the engine; first calculating means for calculating an opening size of the throttle valve based on the operation state of engine; second calculating means for calculating a correction value that corrects the opening size of the throttle valve calculated by the first calculating means; and said control means actuating the actuator based on the calculated correction value.
Claim 23
Dependent Claim
89 words
The apparatus as set forth in claim 20, further comprising: an injection valve for injecting fuel to the engine; means for computing a time period for which the injection valve is open, wherein said computing means performs the computing operation based an the operation state of the engine; first determining means for determining a stable operation of the engine when the opening time period is greater than a predetermined time period; and second determining means for determining the pressure in the brake booster being greater than the predetermined magnitude.
Claim 24
Dependent Claim
30 words
The apparatus as set forth in claim 21, wherein said second calculating means calculates the correction value based on engine speed and the opening time period of the injection valve.
Claim 25
Dependent Claim
59 words
The apparatus as set forth in claim 20, further comprising: means for counting for a predetermined time period after the engine has started to operate; means for comparing the pressure acting in the brake booster with the predetermined magnitude; and said comparing means including means for determining the pressure in the brake booster being greater than the predetermined magnitude.
Claim 26
Dependent Claim
22 words
The apparatus as set forth in claim 23, wherein said second calculating means calculates the correction value based on the engine speed.
Claim 27
Dependent Claim
27 words
The apparatus as set forth in claim 18, wherein said air intake passage has a diverged passage and wherein said valve includes an idle speed control valve.
References Cited (Backward Citations)
GB308680A
Cited
US2876876A
Cited
FR1231337A
Cited
US3947073A
Cited
US4043123A
Cited
US4328669A
Cited
JPS5823244A
Cited
US4610483A
Cited
JPS6121831A
Cited
US5078457A
Cited
US5152587A
Cited
WO1993011983A1
Cited
JPH08164840A
Cited
US5826559A
Cited
US5846164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-08-01 | 2004-01-31 | 2004-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-08-01 | 2008-01-31 | 2008-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-08-01 | 2012-01-31 | 2012-08-01 | $7700.00 | Window Closed / Lapsed |