The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 1998
Filed:
Jul. 05, 1996
Tadaaki Tsuno, Obu, JP;
Shoichi Masaki, Chiryu, JP;
Nippndenso Co., Ltd., Kariya, JP;
Abstract
The wheel speed of each wheel of a vehicle is calculated based on wheel speed signals from wheel speed sensors. The wheel acceleration of each wheel is calculated based on the wheel speed. High frequency components of the wheel acceleration of each wheel are filtered using a high-pass filter to obtain the frequency components of the wheel acceleration which are due only to the road surface condition. Then, a variance of the filtered wheel acceleration is calculated, and a bad road condition determination is executed using the calculated variance. Anti-skid control is carried out based on the bad road condition determination result to provide improved braking control in off-road conditions.