US6283559B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative pressure control apparatus for brake booster
Assignee: Toyota Motor Corp
•
Filing: 1999-04-21
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Granted: 2001-09-04
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Expires: 2019-04-21
Abstract
Abstract A negative pressure control apparatus for a brake booster is provided which can always maintain a required negative pressure in a negative pressure chamber of the brake booster in a system including a direct-injection engine. The apparatus has a brake operation predicting part for predicting execution of a brake operation by a driver. When execution of a brake operation is predicted, negative pressure in the negative pressure chamber is controlled to be a required value.
Inventors
- 👤 Yoshihisa Yamada
- 👤 Hiroaki Endo
- 👤 Ryochi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:30
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/24; B60T13/26; F; F02; F02D; F02D41/00; F02D41/30; F02D41/3011; F02D41/3076; B60T13/46; B60T17/00; B60T17/02; F02D41/02; F02D41/021
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
104 words
A negative pressure control apparatus for a brake booster in a vehicle for controlling negative pressure in a negative pressure chamber of the brake booster connected to an intake pipe of a direct-injection engine at a position downstream of a valve in the intake pipe, comprising: a brake operation predicting part for predicting execution of a brake operation by a driver; and a booster negative pressure controller for controlling the negative pressure in said negative pressure chamber to be a required value when execution of a brake operation is predicted under a condition in which the negative pressure is smaller than a predetermined value.
Claim 2
Dependent Claim
104 words
A negative pressure control apparatus for a brake booster in a vehicle for controlling negative pressure in a negative pressure chamber of the brake booster connected to an intake pipe of a direct-injection engine at a position downstream of a valve in the intake pipe, comprising: a brake operation predicting part for predicting execution of a brake operation by a driver; and a booster negative pressure controller for controlling the negative pressure in said negative pressure chamber to be a required value when execution of a brake operation is predicted under a condition in which the negative pressure is smaller than a predetermined value.
Claim 3
Dependent Claim
36 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said brake operation predicting part predicts execution of a brake operation when the vehicle is running on a downhill road.
Claim 4
Dependent Claim
35 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said brake operation predicting part predicts execution of a brake operation when the vehicle behavior control is being performed.
Claim 5
Dependent Claim
42 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said brake operation predicting part predicts execution of a brake operation when a between-car time to another vehicle running ahead is smaller than a predetermined value.
Claim 6
Dependent Claim
46 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said brake operation predicting part predicts execution of a brake operation when position information is transmitted indicating that the vehicle is running towards a crossing or a free way exit.
Claim 7
Dependent Claim
36 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said brake operation predicting part predicts execution of a brake operation when a shift-down operation is performed by the driver.
Claim 8
Dependent Claim
42 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said brake operation predicting part predicts execution of a brake operation when a depression of an accelerator pedal is being released faster than a predetermined value.
Claim 9
Dependent Claim
45 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said brake operation predicting part predicts execution of a brake operation when a shift lever is in a neutral position or a select lever is in an N range.
Claim 10
Dependent Claim
31 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said negative pressure controller controls the negative pressure by changing an opening of said valve.
Claim 11
Dependent Claim
89 words
The negative pressure control apparatus for a brake booster as claimed in claim 9 , further comprising: a mode determining part for, when said negative pressure controller changes the opening of the valve while the engine is operating in a stratified charge combustion mode, determining whether or not the stratified charge combustion mode can be maintained; and a mode switching part for switching the operation mode of the engine to a stoichiometric combustion mode when said mode determining part determines that the stratified charge combustion mode cannot be maintained.
Claim 12
Dependent Claim
26 words
The negative pressure control apparatus for a brake booster as claimed in claim 1 , wherein said required value is determined based on the vehicle speed.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-09-03 | 2005-03-05 | 2005-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-09-03 | 2009-03-05 | 2009-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-09-03 | 2013-03-05 | 2013-09-04 | $7700.00 | Window Closed / Lapsed |