Behavior control device of vehicle checking occasionally normal operation of longitudinal acc. sensor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHirotada Otake
Life of this patent
Estimating the term…
Abstract
A behavior control device of a vehicle including a longitudinal acceleration sensor has a judgment system for judging if the longitudinal acceleration sensor is operating normally by comparing an output of the acceleration sensor with a corresponding longitudinal acceleration of the vehicle detected based upon a wheel rotation speed detected by a sensor therefor, excepting at least when the acceleration sensor output is much different from a longitudinal acceleration calculated based upon a wheel drive torque, so that the reliability of the behavior control incorporating the acceleration sensor is ensured, while when the acceleration sensor is not operating normally, the behavior control is modified or suspended.
Claims6
A behavior control device of a vehicle having a vehicle body, wheels supporting the vehicle body, an engine for driving the vehicle through at least a pair of drive wheels foaming a part of the body support wheels, and a brake system for selectively braking at least a part of the body support wheels, the device comprising:
- means for detecting operation parameters of the vehicle, the vehicle operation parameter detection means including an acceleration sensor for detecting longitudinal acceleration of the vehicle depending upon an inertia of a movable mass element, means for detecting rotation speed of at least one of the body support wheels, means for detecting a torque for driving the drive wheels, means for detecting longitudinal acceleration of the vehicle depending upon the wheel rotation speed detected by the wheel rotation speed detection means, and means for detecting longitudinal acceleration of the vehicle dependent upon the wheel drive torque detected by the wheel drive torque detection means,
- means for judging the acceleration sensor as not operating normally according to the longitudinal acceleration detected by the acceleration sensor being different from the longitudinal acceleration detected by the wheel rotation dependent longitudinal acceleration detection means beyond a threshold value predetermined therefor, excepting at least when the longitudinal acceleration detected by the acceleration sensor is not different from the longitudinal acceleration detected by the wheel drive torque dependent longitudinal acceleration detection means beyond a threshold value predetermined therefor, and
- means for controlling the brake system based upon the operation parameter or parameters of the vehicle detected by at least one, including the acceleration sensor, of the vehicle operation parameter detection means, so as to control a running behavior of the vehicle, with a modification thereof for a compensation for a failure of a normal operation of the acceleration sensor when it is not judged as normally operating by the acceleration sensor normal operation judgment means.
Dependencies are inferred from the claim text.