US PATENT SUBCLASS 303 / 121
SPEED-CONTROLLED

Current as of: June, 1999
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303 /   HD   FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS

121SPEED-CONTROLLED {44}
122  DF  .~> With failure responsive means {8}
123  DF  .~> For a tractor-trailer type vehicle {1}
125  DF  .~> Automatic braking including speed governor or hydraulic retarder {1}
127  DF  .~> Pneumatic {1}
137  DF  .~> Motorcycle
138  DF  .~> Speed, deceleration, or ABS indication
139  DF  .~> And traction control {6}
146  DF  .~> With yaw control {2}
149  DF  .~> Split coefficient of friction (mu)
150  DF  .~> Specific mu determination
151  DF  .~> Traction-motor vehicle
152  DF  .~> Regenerative brakes
153  DF  .~> Lead signal control for antiskid
154  DF  .~> Multiple control signal with multiple threshold
155  DF  .~> Braking pressure demand or braking force desire
156  DF  .~> Pulse frequency or time period controlling pressure rebuild
157  DF  .~> Pressure release control
158  DF  .~> Pressure reapply control
159  DF  .~> Wheel pressure delay compared to reference
160  DF  .~> Pressure or specific condition (e.g., deceleration) determines wheel speed instead of direct speed sensor
161  DF  .~> Current or voltage ramp proportional to vehicle speed
162  DF  .~> Current control of linear piston drive motor
163  DF  .~> Slip ratio
164  DF  .~> Slip time versus nonslip time
165  DF  .~> Variable target slip values
166  DF  .~> Wheel speed sensor and braking pressure sensor
167  DF  .~> Brake force or pressure determined from speed sensors
168  DF  .~> Wheel generated pulse signal control (speed sensor)
169  DF  .~> Left or right speed comparison
170  DF  .~> Select high wheel speed versus select low
171  DF  .~> Wheel speed versus pseudo vehicle speed (e.g., from deceleration) {2}
174  DF  .~> Previously stored wheel speed information
175  DF  .~> Incipient or imminent skid measured
176  DF  .~> Antilock control disabled or altered for acceleration or speed ranges
177  DF  .~> Sensing jerk, acceleration, or deceleration {8}
186  DF  .~> Front-rear axle apportioning or speed difference
187  DF  .~> Diagonal wheels apportioning arrangement
188  DF  .~> All wheel apportioning arrangement (e.g., cross coupling)
189  DF  .~> Independent control for each wheel
190  DF  .~> Four-wheel drive or all wheel drive
191  DF  .~> Odd condition or device detection (e.g., fluid or brake temperature, hill holder, anti-squeal controller, acoustic emission) {6}
199  DF  .~> Electric control circuit detail
112  DF  .~> Torque sensing
113.1  DF  .~> Having a valve system responsive to a wheel lock signal {12}

DEFINITION

Classification: 303/121

Speed-controlled:

(under the class definition) Subject matter wherein the braking fluid and therefore the braking action is regulated by velocity.

(1) Note. A speed condition can be, for example, a velocity signal from a single wheel or plural wheels, or a velocity signal from a vehicle body.

(2) Note. Included in this subclass are the following: a positive rate-of-change of velocity (acceleration) from a wheel or plural wheels; a negative rate-of-change of velocity (deceleration) from a wheel or plural wheels; an acceleration from a vehicle body; or a deceleration from a vehicle body.

SEE OR SEARCH CLASS

73, Measuring and Testing,

488+, for measuring and testing speed or acceleration, subclass 495 for speed or acceleration diverse condition indicating, and subclass 509, for speed or acceleration with response to a nonspeed condition.

116, Signals and Indicators, 57, for devices to indicate when a predetermined speed is reached.

188, Brakes,

180+, for the regulation of vehicle brakes (nonfluid pressure) in response to speed changes.

192, Clutches and Power-Stop Control,

103, for interrelated power delivery speed automatic control.

246, Railway Switches and Signals,

182, for speed control systems, and especially for automatic vehicle-carried braking and speed comparison circuits respectively.

307, Electrical Transmission or Interconnection Systems,

10.1, for automobile mounted systems.

340, Communications: Electrical,

441, for alarms or indicators which respond to vehicle speed and may also respond to variations in the pressure within a hydraulic brake system.

361, Electricity: Electrical Systems and Devices, 236+, for electrical speed signal processing systems.

477, Interrelated Power Delivery Controls, Including Engine Control,

40, for using an engine transmission control with brake control to slow a vehicle and subclasses 182+ for an engine brake control to slow a vehicle.

701, Data Processing: Vehicles, Navigation, and Relative Location,

70, for indication or control of braking, acceleration, or deceleration; subclasses 71+ and 82+ for processing or calculating a parameter used to determine antiskid, antilock, or antispin.