# US 8,571,732 B2 · Vehicle skid control device

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- Number: US 8,571,732 B2
- Document ID: US8571732B2
- Status: Granted
- Kind: B2
- Application number: 12/810,474
- Filed: 2008-12-11
- Published: 2010-11-04
- Granted: 2013-10-29
- Earliest claimed: 2007-12-27
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Michio Yoshida; Kenji Umayahara; Tomoyuki Nishida
- Inventors: Michio Yoshida; Kenji Umayahara; Tomoyuki Nishida
- Web page: https://patentgrep.com/patent/US8571732B2

## CPC

- B60L 3/10: Indicating wheel slip {; Correction of wheel slip}
- B60T 8/175: Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control (safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16)
- B60T 8/48: connecting the brake actuator to an alternative or additional source of fluid pressure {, e.g. traction control systems}
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES

## Abstract

Provided is a vehicle skid control device that avoids a skid erroneous judgment in a high revolution range of a motor. The vehicle skid control device detects the number of revolutions of the motor. When the number of revolutions of the motor is equal to or larger than a predetermined threshold value Nm, the vehicle skid control device prohibits a skid judgment. When the number of revolutions of the motor is smaller than the predetermined threshold value Nm, the vehicle skid control device permits the skid judgment. When the number of revolutions of the motor is equal to or larger than the threshold value Nm, the skid judgment is prohibited. Accordingly, it is possible to avoid the skid erroneous judgment in the high revolution range with the number of revolutions equal to or larger than Nm.

## Claims

### Claim 1

A vehicle skid control device configured to control a motor transmitting power to a drive shaft connected to drive wheels of respective wheels, the vehicle skid control device comprising:
a number-of-revolutions detection device configured to detect the number of revolutions of the motor;
an angular acceleration detection device configured to detect an angular acceleration of the drive shaft;
a skid judgment device configured to judge, based on the angular acceleration detected by the angular acceleration detection device, whether or not the drive wheels are skidding; and
a skid judgment execution condition judgment device configured to permit, when the number of revolutions detected by the number-of-revolutions detection device is smaller than a predetermined threshold value, a skid judgment by the skid judgment device, and to prohibit, when the number of revolutions detected by the number-of-revolutions detection device is equal to or larger than the predetermined threshold value, the skid judgment by the skid judgment device.

### Claim 2 (depends on 1)

The vehicle skid control device according to claim 1, wherein the predetermined threshold value corresponds to the smallest number of revolutions in a range of the number of revolutions of the motor at which the skid judgment device makes a skid erroneous judgment due to a detection error of the angular velocity detection device.