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Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 303 | FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS |
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1 | MISCELLANEOUS |
2 | MULTIPLE SYSTEMS |
5 | MULTIPLE FLUID-RECEIVING DEVICES |
6.01 | Multiple motors |
6.1 | Brake and door |
7 | Sectional train |
9 | Supplementary in emergency |
9.61 | Separate and simultaneous control |
9.62 | Apportioning control |
9.63 | Failure responsive |
9.64 | Motorcycle |
9.65 | Manual |
9.66 | For pneumatic system |
9.67 | Inertia |
9.69 | Load |
9.71 | Having significant pressure control by front brake |
9.72 | Having multiple pistons affecting fluid flow |
9.73 | Having significant output feature |
9.75 | Detail |
9.76 | Spring operated motor |
10 | WITH PUMP |
13 | MULTIPLE CONTROL |
18 | EXTERIOR CONTROL |
121 | SPEED-CONTROLLED |
122 | With failure responsive means |
122.01 | Traction failure |
122.02 | Antilock failure with warning |
122.03 | Failure related to brake condition (e.g., wear, sensor or switch operation) with indicator |
122.04 | Electric system failure (no warning) |
122.06 | ABS failure detected via time period of sensed wheel lock or wheel speed signal |
122.07 | Time signal error (no warning) |
122.08 | Active circuit testing |
122.09 | Pressure failure |
123 | For a tractor-trailer type vehicle |
125 | Automatic braking including speed governor or hydraulic retarder |
127 | Pneumatic |
137 | Motorcycle |
138 | Speed, deceleration, or ABS indication |
139 | And traction control |
140 | With yaw control |
141 | With engine torque power take-off (PTO) control |
142 | Motor control |
143 | With four wheel drive or all wheel drive |
144 | Intersecting traction and skid occurrence |
145 | Odd condition (e.g., fuel supply cut-off, modulating valve) |
146 | With yaw control |
149 | Split coefficient of friction (mu) |
150 | Specific mu determination |
151 | Traction-motor vehicle |
152 | Regenerative brakes |
153 | Lead signal control for antiskid |
154 | Multiple control signal with multiple threshold |
155 | Braking pressure demand or braking force desire |
156 | Pulse frequency or time period controlling pressure rebuild |
157 | Pressure release control |
158 | Pressure reapply control |
159 | Wheel pressure delay compared to reference |
160 | Pressure or specific condition (e.g., deceleration) determines wheel speed instead of direct speed sensor |
161 | Current or voltage ramp proportional to vehicle speed |
162 | Current control of linear piston drive motor |
163 | Slip ratio |
164 | Slip time versus nonslip time |
165 | Variable target slip values |
166 | Wheel speed sensor and braking pressure sensor |
167 | Brake force or pressure determined from speed sensors |
168 | Wheel generated pulse signal control (speed sensor) |
169 | Left or right speed comparison |
170 | Select high wheel speed versus select low |
171 | Wheel speed versus pseudo vehicle speed (e.g., from deceleration) |
174 | Previously stored wheel speed information |
175 | Incipient or imminent skid measured |
176 | Antilock control disabled or altered for acceleration or speed ranges |
177 | Sensing jerk, acceleration, or deceleration |
178 | Wheel deceleration to find velocity error |
179 | Rotary and linear inertia |
180 | Rotary inertia |
181 | Linear inertia or accelerometer (includes pendulum type) |
182 | Accelerometer versus wheel rotation sensor |
183 | Specific acceleration or deceleration determined electronically |
184 | Acceleration-deceleration versus timing |
185 | Sensing deceleration then acceleration |
186 | Front-rear axle apportioning or speed difference |
187 | Diagonal wheels apportioning arrangement |
188 | All wheel apportioning arrangement (e.g., cross coupling) |
189 | Independent control for each wheel |
190 | Four-wheel drive or all wheel drive |
191 | Odd condition or device detection (e.g., fluid or brake temperature, hill holder, anti-squeal controller, acoustic emission) |
192 | Vehicle inclination |
193 | With sonar or radar type sensor |
194 | Hop or bounce (from vibration or oscillation) signal |
195 | Spurious signal |
197 | With feeler wheel |
198 | Speed and vehicle load condition (e.g., cargo) |
199 | Electric control circuit detail |
112 | Torque sensing |
113.1 | Having a valve system responsive to a wheel lock signal |
113.2 | With traction control |
113.4 | Including a stroke sensor |
113.5 | With system apportioning control |
114.1 | Including hydraulic power booster |
114.3 | Including pneumatic power booster |
115.1 | System controlled by expansible chamber type modulator |
115.2 | Having electric control |
115.3 | Having vacuum motor control |
115.4 | Having pump pressure control |
115.6 | Including flywheel control (e.g., motorcycle type) |
116.1 | Including pump with system solenoid valve |
116.3 | Vehicle wheel operated pump |
116.4 | System pump structure detail |
117.1 | Spool valve |
118.1 | Pneumatic (relay or motorman) type |
119.1 | System controlled by solenoid valve |
20 | ELECTRIC CONTROL |
22.1 | LOAD CONTROL |
22.2 | Empty and load type |
22.4 | Failure responsive |
22.5 | Responsive to fluid pressure spring |
22.6 | Railway vehicle |
22.8 | Detail |
24.1 | INERTIA CONTROL |
25 | AUTOMATIC AND DIRECT |
28 | AUTOMATIC |
29 | Supplementary control pipe |
30 | Supplementary reservoir pipe |
31 | Vacuum |
32 | Equilibrium |
33 | Equalizing valves |
35 | Synchronizing |
40 | Application valve |
41 | Preliminary valve movement |
43 | Slow-reduction emergency |
44 | Secondary service operation |
45 | Positive-movement equalizing valve |
46 | Augmented feed to motor |
47 | Train rear end first |
48 | DIRECT |
50 | MOTORMAN'S VALVES |
CHARGING |
57 | Plurality of pressures |
58 | Reuse |
59 | Outlet-pressure control |
61 | Intermittent |
Motor |
64 | Auxiliary reservoir |
66 | Control pipe |
RELEASING |
68 | Motor |
80 | Auxiliary reservoir |
81 | Control pipe |
84.1 | FLOW RETARDER |
85 | SUPPLEMENTARY RESERVOIR |
86 | MISCELLANEOUS OPERATIONS ON CONTROL PIPE |
87 | PULSATION NEUTRALIZERS |
89 | LOCKS |
90 | PIPELESS VALVES |
CROSS-REFERENCE ART COLLECTIONS | ||
900 | ABS THROTTLE CONTROL |
901 | ABS CHECK VALVE DETAIL |
FOREIGN ART COLLECTIONS | ||
FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
DIGESTS | ||
DIG1 | PRESSURE COMPARISON |
DIG2 | BRAKE CONTROL BY PRESSURE COMPARISON |
DIG5 | ACCELERATION PEAK DETECTION |
DIG6 | AXLE DIFFERENTIAL CONTROL |
DIG7 | SMALL TIRE DIGEST |
DIG8 | ANTICHATTER |
DIG9 | PLURAL PROCESSORS |
DIG10 | VALVE BLOCK INTEGRATING PUMP, VALVES, SOLENOID, ACCUMULATOR, ETC. |
DIG11 | ACCUMULATOR |
DIG12 | AIR OVER HYDRAULIC BRAKE SYSTEM |
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