US4896924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antiskid control device
Assignee: Aisin Corp
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Filing: 1989-04-19
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Granted: 1990-01-30
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Expires: 2009-04-19
Abstract
Abstract An antiskid device according to this invention controls the hydraulic pressure to vehicle brakes based on the rotational speed of the wheel having the smallest coefficient of friction until a standard vehicle velocity becomes less than a predetermined velocity. Further, the antiskid device controls the hydraulic pressure to the brakes based on the speed of each wheel if the standard vehicle velocity becomes less than the predetermined velocity. Accordingly, directional stabilization of the vehicle is maintained when the vehicle runs at high speed, and at low speed, the braking range for stopping the vehicle is mainimized by utilizing the braking force more efficiently.
Inventors
- 👤 Kazutaka Kuwana
- 👤 Tsuyoshi Yoshida
- 👤 Shinsuke Sakane
- 👤 Tetsuya Miyachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:41
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1764
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
254 words
An antiskid control device for a vehicle having a plurality of wheels each with a hydraulic pressure-actuated brake, and a movable brake pedal for applying hydraulic pressure to the brakes, comprising: start detecting means for detecting the initial movement of the brake pedal during braking; means for detecting the rotational speed of each of the plurality of wheels, and generating at prescribed intervals a wheel speed signal corresponding to the rotational speed of each wheel; presuming means responsive to the speed detecting means for generating at the prescribed intervals a standard vehicle speed signal corresponding to one of a predetermined speed and the highest speed of any of the plurality of wheels; selecting means for generating at the prescribed intervals one of a low coefficient signal corresponding to the rotational speed of the one of the wheels having the lowest coefficient of friction with the driving surface and a low speed signal corresponding to the rotational speed of the one of the wheels having the lowest rotational speed; and pressure control means responsive to the start detecting means for automatically controlling the hydraulic pressures applied to each of the brakes in response to the standard vehicle speed signal and the wheel speed signals when at least one of the wheel speed signals corresponds to a speed below than a specified level, and the standard vehicle speed signal and one of the low coefficient signal and the low speed signal when all of the wheel speed signals correspond to a speed below the specified level.
Claim 2
Dependent Claim
254 words
An antiskid control device for a vehicle having a plurality of wheels each with a hydraulic pressure-actuated brake, and a movable brake pedal for applying hydraulic pressure to the brakes, comprising: start detecting means for detecting the initial movement of the brake pedal during braking; means for detecting the rotational speed of each of the plurality of wheels, and generating at prescribed intervals a wheel speed signal corresponding to the rotational speed of each wheel; presuming means responsive to the speed detecting means for generating at the prescribed intervals a standard vehicle speed signal corresponding to one of a predetermined speed and the highest speed of any of the plurality of wheels; selecting means for generating at the prescribed intervals one of a low coefficient signal corresponding to the rotational speed of the one of the wheels having the lowest coefficient of friction with the driving surface and a low speed signal corresponding to the rotational speed of the one of the wheels having the lowest rotational speed; and pressure control means responsive to the start detecting means for automatically controlling the hydraulic pressures applied to each of the brakes in response to the standard vehicle speed signal and the wheel speed signals when at least one of the wheel speed signals corresponds to a speed below than a specified level, and the standard vehicle speed signal and one of the low coefficient signal and the low speed signal when all of the wheel speed signals correspond to a speed below the specified level.
Claim 3
Dependent Claim
83 words
The device of claim 1, wherein the pressure control means includes comparing means for generating a comparison output signal when the wheel speed signal corresponds to a speed less than the specified level, and the device also includes averaging means for generating an average signal corresponding substantially to the average speed of at least two of the wheels, the pressure control means being responsive to the standard vehicle speed signal and the average signal when the comparing means generates the comparison output signal.
Claim 4
Dependent Claim
78 words
The device of claim 2, wherein the start detecting means also includes means for generating a skid-rate signal corresponding to the skid-rate of each wheel, means for generating a deceleration rate signal corresponding to the rate of deceleration of each wheel, and means for storing a plurality of predetermined relationships between skid-rate and rate of deceleration for controlling the hydraulic pressures applied to each of the brakes in response to the skid-rate signal and the deceleration rate signal.
Claim 5
Dependent Claim
38 words
The device of claim 3, wherein the plurality of predetermined relationships includes a first optimum relationship and a second better than optimum relationship, and the device includes changing means for selectively changing between the first and second relationships.
Claim 6
Dependent Claim
31 words
The device of claim 2, wherein the comparing means includes means for storing the specified level and means for comparing the speed corresponding to the wheel signal with the specified level.
Claim 7
Dependent Claim
43 words
The device of claim 2, wherein the pressure control means includes switch means for selectively outputting one of the low coefficient signal and the average signal, and skid control means for maintaining the skid-rate of the vehicle within a prescribed substantially optimum range.
Claim 8
Dependent Claim
85 words
The device of claim 1, wherein the vehicle includes a plurality of pipelines for connecting the brakes with a source of hydraulic pressure, the speed detecting means includes at least two speed detecting circuits, each for detecting the rotational speed of a different plurality of the wheels, the selecting means includes at least two selecting circuits, and the pressure control means includes at least two pressure control circuits, one of the pressure control circuits for controlling the hydraulic pressure in each of the pipelines, respectively.
Claim 9
Dependent Claim
165 words
An antiskid control device comprising: start detecting means for detecting a beginning of braking; a plurality of wheel speed detecting means for detecting a respective rotational speeds of wheels; presuming means for presuming a standard vehicle velocity based on an output of the wheel speed detecting means; comparing means for generating an output when the standard vehicle velocity becomes under predetermined velocity; selecting means for selecting and outputting a speed of one wheel having the lowest coefficient of friction between the respective wheels and a road surface; and pressure controlling means for controlling hydraulic pressures to brakes which starts its operation in response to an output from the starting detecting means and executes one pressure control based on the standard vehicle velocity and the respective speeds of wheels when the output from the comparing means appears, and executes the other pressure control based on the standard vehicle velocity and the output of the selecting means of wheels when the output from the comparing means disappears.
Claim 10
Dependent Claim
165 words
An antiskid control device comprising: start detecting means for detecting a beginning of braking; a plurality of wheel speed detecting means for detecting a respective rotational speeds of wheels; presuming means for presuming a standard vehicle velocity based on an output of the wheel speed detecting means; comparing means for generating an output when the standard vehicle velocity becomes under predetermined velocity; selecting means for selecting and outputting a speed of one wheel having the lowest coefficient of friction between the respective wheels and a road surface; and pressure controlling means for controlling hydraulic pressures to brakes which starts its operation in response to an output from the starting detecting means and executes one pressure control based on the standard vehicle velocity and the respective speeds of wheels when the output from the comparing means appears, and executes the other pressure control based on the standard vehicle velocity and the output of the selecting means of wheels when the output from the comparing means disappears.
Claim 11
Dependent Claim
58 words
An antiskid control device according to claim 8, wherein the start detecting means further comprising: depression detecting means for detecting a depression of a brake pedal; means for calculating skid-rates of the wheels; means for calculating decelerations of the wheels; means for memorizing predetermined conditions; and means for judging the braking based on the skidrate and the deceleration.
Claim 12
Dependent Claim
76 words
An antiskid control device according to 9, wherein said memorizing means further comprises: a first condition memorizing means for memorizing an area for starting a skid-rate control based on an optimum skid-rate; a second condition memorizing means for memorizing an area for starting the skid-rate control based on a higher skid-rate than the optimum skid-rate; and means for choosing the first and the second memorizing means selectively in response to the depression of the brake pedal.
Claim 13
Dependent Claim
76 words
An antiskid control device according to 9, wherein said memorizing means further comprises: a first condition memorizing means for memorizing an area for starting a skid-rate control based on an optimum skid-rate; a second condition memorizing means for memorizing an area for starting the skid-rate control based on a higher skid-rate than the optimum skid-rate; and means for choosing the first and the second memorizing means selectively in response to the depression of the brake pedal.
Claim 14
Dependent Claim
31 words
An antiskid control device according to claim 8, wherein said comparing means further comprising: means for memorizing the predetermined velocity; and means for comparing the standard velocity with the predetermined velocity.
Claim 15
Dependent Claim
50 words
An antiskid control device according to claim 8, further comprising averaging means for calculating an average speed among the wheels, thereby the pressure controlling means control the hydraulic pressures based on a standard vehicle velocity and selected signals from the averaging means when the output from the comparing means appears.
Claim 16
Dependent Claim
45 words
An antiskid control device according to claim 12, wherein said pressure controlling means further comprising: changing means for selectively putting out one on the outputs from the selecting means and the averaging means; and skid controlling means for maintaining a skid-rate with an optimum range.
Claim 17
Dependent Claim
156 words
An antiskid control device comprising: start detecting means for detecting a beginning of braking; a plurality of wheel speed detecting means for detecting a respective rotational speeds of wheels; presuming means for presuming a standard vehicle velocity based on an output of the wheel speed detecting means; comparing means for generating an output when the standard vehicle velocity becomes under predetermined speed; selecting means for selecting and outputting a speed of one wheel having the lowest rotational speed; and pressure controlling means for controlling hydraulic pressures to brakes which starts its operation in response to an output from the starting detecting means and executes one pressure control based on the standard vehicle velocity and the respective speeds of wheels when the output from the comparing means appears, and executes the other pressure control based on the standard vehicle velocity and the output of the selecting means of wheels when the output from the comparing means disappears.
Claim 18
Dependent Claim
156 words
An antiskid control device comprising: start detecting means for detecting a beginning of braking; a plurality of wheel speed detecting means for detecting a respective rotational speeds of wheels; presuming means for presuming a standard vehicle velocity based on an output of the wheel speed detecting means; comparing means for generating an output when the standard vehicle velocity becomes under predetermined speed; selecting means for selecting and outputting a speed of one wheel having the lowest rotational speed; and pressure controlling means for controlling hydraulic pressures to brakes which starts its operation in response to an output from the starting detecting means and executes one pressure control based on the standard vehicle velocity and the respective speeds of wheels when the output from the comparing means appears, and executes the other pressure control based on the standard vehicle velocity and the output of the selecting means of wheels when the output from the comparing means disappears.
Claim 19
Dependent Claim
58 words
An antiskid control device according to claim 14, wherein the start detecting means further comprising: depression detecting means for detecting a depression of a brake pedal; means for calculating skid-rates of the wheels; means for calculating decelerations of the wheels; means for memorizing predetermined conditions; and means for judging the braking based on the skidrate and the deceleration.
Claim 20
Dependent Claim
77 words
An antiskid control device according to claim 15, wherein said memorizing means further comprising: a first condition memorizing means for memorizing an area for starting a skid-rate control based on an optimum skid-rate; a second condition memorizing means for memorizing an area for starting the skid-rate control based on a higher skid-rate than the optimum skid-rate; and means for choosing the first and the second memorizing means selectively in response to the depression of the bake pedal.
Claim 21
Dependent Claim
31 words
An antiskid control device according to claim 14, wherein said comparing means further comprising: means for memorizing the predetermined velocity; and means for comparing the standard velocity with the predetermined velocity.
Claim 22
Dependent Claim
50 words
An antiskid control device according to claim 14, further comprising averaging means for calculating an average speed among the wheels, whereby the pressure controlling means control the hydraulic pressures based on the standard vehicle velocity and selected signals from the averaging means when the output from the comparing means appears.
Claim 23
Dependent Claim
45 words
An antiskid control device according to claim 18, wherein said pressure controlling means further comprising: changing means for selectively putting out one on the outputs from the selecting means and the averaging means; and skid controlling means for maintaining a skid-rate within an optimum range.
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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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |