US5984435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control system for vehicle
Assignee: Nissan Motor Co Ltd
•
Filing: 1997-03-27
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Granted: 1999-11-16
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Expires: 2017-03-27
Abstract
Abstract A brake control system is comprised of a vehicle environment recognition device for obtaining vehicle environment including a road condition, an actuator for applying hydraulic pressure set at a target value to each wheel cylinder, and a controller for calculating the target value on the basis of the vehicle environment. The controller controls the wheel cylinder pressure by driving the actuator so as to adjusting the wheel cylinder pressure at the target value. Therefore, it becomes possible to ensure the same braking distance by the same depression degree of the brake even in various road conditions.
Inventors
- 👤 Masahiro Tsukamoto
- 👤 Hiroshi Takahashi
- 👤 Katsunori Oshiage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:35
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/24; B60T8/17; B60T8/176; B60T8/1763; B60T8/17636; B60T13/00; B60T13/74; B60T13/741; B60T7/00; B60T7/02; B60T7/04; B60T7/042; B60T7/12; B60T7/22; B60R; B60R21/00; B60R21/01; B60R21/013; B60R21/0134; B60T2210/00; B60T2210/10; B60T2220/00; B60T2220/04; B60Y; B60Y2400/00; B60Y2400/30; B60Y2400/306
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
77 words
A brake control system for executing a braking of a vehicle, comprising: means for detecting driver braking intent; an actuator that applies braking force to each wheel on the basis of the detected driver braking intent; a road inclination detector that detects an inclination of a road on which the vehicle travels; and a controller that changes a relationship between the driver braking intent and the braking force of each wheel according to the detected road inclination.
Claim 2
Dependent Claim
77 words
A brake control system for executing a braking of a vehicle, comprising: means for detecting driver braking intent; an actuator that applies braking force to each wheel on the basis of the detected driver braking intent; a road inclination detector that detects an inclination of a road on which the vehicle travels; and a controller that changes a relationship between the driver braking intent and the braking force of each wheel according to the detected road inclination.
Claim 3
Dependent Claim
30 words
A brake control system as claimed in claim 1, further including an obstacle sensor that obtains information indicative of an obstacle located near the vehicle without directly contacting the obstacle.
Claim 4
Dependent Claim
29 words
A brake control system as claimed in claim 2, the obstacle information includes information relating to at least one of an obstacle preceding the vehicle and a preceding vehicle.
Claim 5
Dependent Claim
50 words
A brake control system as claimed in claim 3, wherein the controller increases the braking force relative to the driver braking intent according to increase in at least one of proximity to a forward obstacle or preceding vehicle and the approaching speed to a forward obstacle or the preceding vehicle.
Claim 6
Dependent Claim
81 words
A brake control system as claimed in claim 2, wherein the obstacle sensor includes one of a device for reading and processing picture information indicative of vehicle environment, a device for measuring a distance between an obstacle and the vehicle by emitting light and receiving the reflection of the light from the obstacle, and a device for measuring a distance between an obstacle and the vehicle by emitting radio wave and receiving the reflection of the radio wave from the obstacle.
Claim 7
Dependent Claim
24 words
A brake control system as claimed in claim 1, further including a device that estimates vehicle environment information from the operation of the driver.
Claim 8
Dependent Claim
18 words
A brake control system as claimed in claim 6, wherein the environment information includes a type of road.
Claim 9
Dependent Claim
133 words
A brake control system as claimed in claim 7, wherein said controller treats a relationship between the driver braking intent and the braking force on a suburb road as a reference, increasing the braking force relative to the driver braking intent on an expressway, decreasing the braking force relative to the driver braking intent when the vehicle travels on an urban road and the driver braking intent is small, increasing the braking force relative to the driver braking intent when the vehicle travels on the urban road and the driver braking intent is large, increasing the braking force relative to the driver braking intent when the vehicle travels on a downwardly sloped road, and decreasing the braking force relative to the driver braking intent when the vehicle travels on an upwardly sloped road.
Claim 10
Dependent Claim
37 words
A brake control system as claimed in claim 1, further including a device that determines a road curvature, the controller also changing the relationship between the braking force of each wheel according to the road curvature determined.
Claim 11
Dependent Claim
32 words
A brake control system as claimed in claim 9, wherein the controller increases the braking force of front wheels and decreases the braking force of rear wheels as the road curvature increases.
Claim 12
Dependent Claim
29 words
A brake control system as claimed in claim 9, wherein the controller increases the braking force of outer side wheels relative to the driver braking intent during turning operation.
Claim 13
Dependent Claim
51 words
A brake control system as claimed in claim 1, wherein the road inclination detector comprises a navigational system from which a vehicle traveling position is obtained, wherein the road inclination is obtained from a map or change of the vehicle traveling position on the basis of the obtained vehicle traveling position.
Claim 14
Dependent Claim
34 words
A brake control system as claimed in claim 12, wherein the road inclination is obtained from the map and the vehicle traveling position is changed forward according to the increase of the vehicle speed.
Claim 15
Dependent Claim
22 words
A brake control system as claimed in claim 1, further including means for detecting at least one of snow and rain conditions.
Claim 16
Dependent Claim
31 words
A brake control system as claimed in claim 14, wherein the controller decreases the braking force relative to the driver braking intent when a heavy snow or rain condition is detected.
Claim 17
Dependent Claim
37 words
A brake control system as claimed in claim 1, wherein the driver braking intent detecting means comprises one of a master cylinder pressure detector, a brake pedal depressing force detector, and a brake pedal depressed stroke detector.
Claim 18
Dependent Claim
38 words
A brake control system as claimed in claim 16, wherein the controller increases one of the braking force and the wheel cylinder pressure relative to the driver braking intent when the vehicle travels on a downwardly sloped road.
Claim 19
Dependent Claim
23 words
A brake control system as claimed in claim 1, further including means for determining whether the vehicle traveling road is a paved road.
Claim 20
Dependent Claim
30 words
A brake control system as claimed in claim 18, wherein the controller decreases the braking force relative to the driver braking intent when the traveling road is an unpaved road.
Claim 21
Dependent Claim
41 words
A brake control system as claimed in claim 1, wherein the road inclination detector comprises a navigation system that detects a vehicle position, wherein the road inclination is determined based on environmental information of the vehicle position stored in a map.
Claim 22
Dependent Claim
42 words
A braking control system as claimed in claim 1, wherein the controller changes the relationship between the driver braking intent and the braking force to keep a distance corresponding to the driver braking intent constant even if the road inclination is varied.
Claim 23
Dependent Claim
41 words
A braking control system as claimed in claim 1, wherein the controller changes the relationship between the driver braking intent and the braking force so that a braking distance based on the braking intent becomes equal regardless of the road inclination.
Claim 24
Dependent Claim
89 words
A brake control system of a vehicle, comprising: a road inclination sensor that measures an inclination of a road; a pressure generating source that generates a brake pressure corresponding to a brake operating force applied by a driver; an actuator that controllably changes the brake pressure and applies the changed pressure to each wheel cylinder; a controller that calculates a target value of the wheel cylinder pressure on the basis of the measured road inclination and controls the wheel cylinder pressure to the target value by driving said actuator.
Claim 25
Dependent Claim
89 words
A brake control system of a vehicle, comprising: a road inclination sensor that measures an inclination of a road; a pressure generating source that generates a brake pressure corresponding to a brake operating force applied by a driver; an actuator that controllably changes the brake pressure and applies the changed pressure to each wheel cylinder; a controller that calculates a target value of the wheel cylinder pressure on the basis of the measured road inclination and controls the wheel cylinder pressure to the target value by driving said actuator.
Claim 26
Dependent Claim
69 words
A brake control system as claimed in claim 23, wherein the road inclination sensor comprises a forward monitoring camera that monitors a forward direction of the vehicle, wherein the road inclination is measured by obtaining a change ratio of the road inclination from picture information obtained by the forward monitoring camera and by executing an integral of an initial value relative to the change ratio of the road inclination.
Claim 27
Dependent Claim
37 words
A brake control system as claimed in claim 24, wherein the initial value of the road inclination is obtained from a drive force obtained from an output torque of the engine and an acceleration of the vehicle.
Claim 28
Dependent Claim
38 words
A brake control system as claimed in claim 24, wherein the initial value of the road inclination is obtained from a drive force obtained from a slip ratio of a torque converter and an acceleration of the vehicle.
Claim 29
Dependent Claim
21 words
A brake control system as claimed in claim 24, wherein the inclination change ratio is changed according to the vehicle speed.
Claim 30
Dependent Claim
35 words
A brake control system as claimed in claim 23, wherein the target value of the wheel cylinder pressure is determined by changing the pressure of the pressure generating source in proportion to the road inclination.
Claim 31
Dependent Claim
41 words
A brake control system as claimed in claim 23, wherein the target value of the wheel cylinder pressure is determined by increasing the pressure of the pressure generating source in proportion to the road inclination when the target value is increased.
Claim 32
Dependent Claim
42 words
A brake control system as claimed in claim 23, wherein a proportion constant, which is applied to the calculation of the target value of the wheel cylinder pressure, is set from a standard loaded weight of a vehicle and brake system components.
Claim 33
Dependent Claim
30 words
A brake control system as claimed in claim 23, wherein the pressure of the pressure generating source is mechanically transferred to the wheel cylinder when the actuator is not operated.
Claim 34
Dependent Claim
69 words
A brake control system as claimed in claim 23, wherein the actuator always controls the wheel cylinder pressure on the basis of a master cylinder pressure to the target value when the brake control is executed and the actuator always controls the wheel cylinder pressure on the basis of the master cylinder pressure to follow the pressure of the pressure generating source when the brake control is not executed.
Claim 35
Independent Claim
71 words
A method of controlling braking of a vehicle, comprising: determining an inclination of a road on which the vehicle is traveling; deciding a brake control gain according to the determined road inclination; detecting braking intent of a driver; deciding a target value of a braking force by correcting driver braking intent through the brake control gain; and controlling a brake actuator to generate the braking force corresponding with the target value.
Claim 36
Independent Claim
71 words
A method of controlling braking of a vehicle, comprising: determining an inclination of a road on which the vehicle is traveling; deciding a brake control gain according to the determined road inclination; detecting braking intent of a driver; deciding a target value of a braking force by correcting driver braking intent through the brake control gain; and controlling a brake actuator to generate the braking force corresponding with the target value.
Claim 37
Dependent Claim
118 words
A brake control system for a vehicle comprising: a wheel cylinder that is installed to each wheel of the vehicle and generates a braking force by increasing the pressure applied to the wheel cylinder; a brake pedal application detecting device that detects a braking intent of a driver; a vehicle environment recognition device that detects vehicle environment, including a road inclination; an actuator that applies hydraulic pressure to the wheel cylinder at a target value; and a controller that determines a target value of the wheel cylinder pressure on the basis of the driver braking intent and at least the road inclination to ensure a predetermined braking distance with respect to the predetermined braking intent of the driver.
Claim 38
Dependent Claim
118 words
A brake control system for a vehicle comprising: a wheel cylinder that is installed to each wheel of the vehicle and generates a braking force by increasing the pressure applied to the wheel cylinder; a brake pedal application detecting device that detects a braking intent of a driver; a vehicle environment recognition device that detects vehicle environment, including a road inclination; an actuator that applies hydraulic pressure to the wheel cylinder at a target value; and a controller that determines a target value of the wheel cylinder pressure on the basis of the driver braking intent and at least the road inclination to ensure a predetermined braking distance with respect to the predetermined braking intent of the driver.
Claim 39
Dependent Claim
128 words
A braking force control device for a vehicle, comprising: a wheel braking cylinder associated with each wheel of the vehicle; an actuation means for generating a main braking pressure corresponding to a force applied thereto; a brake actuation device that supplies the main braking pressure to the wheel braking cylinder and sets the braking pressure applied to the wheel braking cylinder, wherein the braking pressure applied to the braking cylinders is increased or decreased based on vehicle environmental conditions; a vehicle environmental recognition means for detecting the environmental conditions; and a controller that determines a road inclination on the basis of the detected environmental conditions, wherein the controller generates a correction value corresponding to the road inclination and corrects the target braking pressure applied to the braking cylinder.
Claim 40
Dependent Claim
128 words
A braking force control device for a vehicle, comprising: a wheel braking cylinder associated with each wheel of the vehicle; an actuation means for generating a main braking pressure corresponding to a force applied thereto; a brake actuation device that supplies the main braking pressure to the wheel braking cylinder and sets the braking pressure applied to the wheel braking cylinder, wherein the braking pressure applied to the braking cylinders is increased or decreased based on vehicle environmental conditions; a vehicle environmental recognition means for detecting the environmental conditions; and a controller that determines a road inclination on the basis of the detected environmental conditions, wherein the controller generates a correction value corresponding to the road inclination and corrects the target braking pressure applied to the braking cylinder.
References Cited (Backward Citations)
US3978481A
Cited
WO1983003230A1
Cited
DE3805589A1
Cited
US4964679A
Cited
US5332057A
Cited
US5389050A
Cited
US5485892A
Cited
US5390992A
Cited
US5560690A
Cited
US5436835A
Cited
WO1996006763A1
Cited
US5816667A
Cited
US5694321A
Cited
US5711585A
Cited
US5612882A
Cited
US5577812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-11-15 | 2003-05-17 | 2003-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-15 | 2007-05-17 | 2007-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-15 | 2011-05-17 | 2011-11-16 | $7700.00 | Window Closed / Lapsed |