Foley & Lardner, Schwartz, Jeffery, Schwaab, Mack, Blumenthal & Evans
Vehicular height control system for automotive suspension system with improved height control characteristics on undulated road and/or rough road
 A vehicular height control system includes means for detecting road roughness condition on the basis of a vehicular height indicative signal which is produced by a vehicular height sensor. The control system also includes means for detecting the road roughness condition satisfying a predetermined condition for disabling vehicular height control. Disabling of vehicular height control keeps the control system free from fluctuation of vehicular height indicative signal value due to uneveness of the road surface. 
Nissan Motor Company, Limited
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Hideo Kenji Masatsugu
Ito Kawagoe Yokote