Title:
BRAKE FLUID PRESSURE CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP2014231274
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To favorably acquire an actual characteristic of a coil of a holding valve immediately before traction control is started.SOLUTION: When a state that a difference between a drive wheel speed Wd and a target drive wheel speed Wref is larger than a previous application start determination threshold ΔWthb continues for a previous application start determination time Tthb, previous application is performed supposing that a start prediction condition is satisfied. Voltages of duty ratios Dn1, Dn2 are applied to a coil of a holding valve, actual currents Ia1, Ia2 are acquired, and an actual characteristic is acquired. After that, when a state that the difference is larger than a control start determination threshold ΔWtha continues for a control start determination time Ttha, traction control is started supposing that the start condition is satisfied, however, the actual characteristic which is acquired immediately before is used in the control of the holding valve. As above, with the establishment of the start prediction condition as a trigger, the actual characteristic of the holding valve can be favorably acquired immediately before a start of the traction control.
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Inventors:
NAKAOKA KOJI
SATO KEI
SATO KEI
Application Number:
JP2013112461A
Publication Date:
December 11, 2014
Filing Date:
May 29, 2013
Export Citation:
Assignee:
TOYOTA MOTOR CORP
International Classes:
B60T8/17
Domestic Patent References:
| JP2010095026A | 2010-04-30 | |||
| JP2002532337A | 2002-10-02 | |||
| JPH0953480A | 1997-02-25 |
Attorney, Agent or Firm:
Central patent business corporation international patent firm
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