Abstract:
The present invention relates to a method and system for detecting a vehicle rollover or dangerous situations that may precede a rollover, in particular a soil trip type rollover. The method comprises the steps of (a) determining a lateral acceleration of the vehicle, (b) calculating an acceleration differential value on the basis of the lateral accelerations determined in at least two steps (a), (c) determining a possibility of a rollover of the vehicle on the basis of the lateral acceleration determined in at least one step (a) and the acceleration differential value calculated in at least one step (b), (d) generating an output activation signal at least on the basis of a possibility of a rollover of the vehicle determined in a step (c),
where the steps are performed in loops. The present invention also relates to a system of detecting a vehicle rollover and a computer program implementing such method.
Abstract:
The absolute roll angle of a vehicle body (16) is estimated by blending two preliminary roll angle estimates (54) based on their frequency so that the blended estimate continuously favors the more accurate of the preliminary roll angle estimates. A first preliminary roll angle estimate based on the measured roll rate (22) is improved by initially compensating the measured roll rate for bias error (44) using roll rate estimates inferred from other measured parameters. And a second preliminary roll angle estimate is determined according to the sum of the road bank angle and the relative roll angle (46-52). The blended estimate is used to estimate the actual lateral acceleration (56), the lateral velocity and side-slip angle (58) of the vehicle (10), which are used in rollover detection and other various other control applications (34).
Abstract:
The absolute roll angle of a vehicle body (16) is estimated by blending two preliminary roll angle estimates based on their frequency (48) so that the blended estimate continuously favors the more accurate of the preliminary roll angle estimates. A first preliminary roll angle estimate based on the measured roll rate (22) is improved by initially compensating the roll rate signal for bias error using roll rate estimates inferred from other measured parameters (44). And a second preliminary roll angle estimate is determined based on the kinematic relationship among roll angle, lateral acceleration, yaw rate and vehicle speed (46). The blended estimate of roll angle utilizes a blending coefficient that varies with the frequency of the preliminary roll angle signals, and a blending factor used in the blending coefficient is set to different values depending whether the vehicle (10) is in a steady-state or transient condition (48).
Abstract:
Ein Kollisionsschutzsystem insbesondere für bewegte Gegenstände wie zum Beispiel Fahrzeuge umfasst eine der Kollisionsüberwachung dienende Sensoreinheit (30), eine Steuer- und/oder Auswerteeinheit (32) und Kollisionsschutzmittel, wobei die von der Sensoreinheit gelieferten Sensorsignale der Steuer- und/oder Auswerteeinheit zugeführt sind und die Kollisionsschutzmittel über die Steuer- und/oder Auswerteeinheit in Abhängigkeit von den Sensorsignalen auslösbar sind. Die Steuer- und/oder Auswerteeinheit umfasst eine Diskriminierungslogik (34) zur Unterscheidung zwischen eine Aktivierung von Kollisionsschutzmitteln erfordernden bevorstehenden Kollisionen und andersartigen bevorstehenden Kollisionen sowie eine Entsicherungslogik (36) zur Entsicherung der Kollisionsschutzmittel. Die Sensoreinheit umfasst wenigstens zwei Sensoren (38,40), deren Sensorsignale jeweils sowohl der Diskriminierungslogik als auch der Entsicherungslogik der Steuer- und/oder Auswerteeinheit zugeführt sind, wobei die Diskriminierungslogik in Abhängigkeit von den Sensorsignalen der Sensoren ein Diskriminierungssignal und die Entsicherungslogik in Abhängigkeit von den Sensorsignalen der Sensoren ein Entsicherungssignal liefert. Die Steuer- und/oder Auswerteeinheit umfasst ferner eine Auslöselogik (42), um in Abhängigkeit von dem Diskriminierungssignal und dem Entsicherungssignal ein Auslösesignal zur Auslösung der Kollisionsschutzmittel zu liefern.
Abstract:
The present invention relates to a method and system for detecting a vehicle rollover or dangerous situations that may precede a rollover of a vehicle. The method comprises the steps of (a) measuring the set of input signals including at least vehicle velocity, vehicle steering angle, vehicle lateral acceleration, and vehicle roll rate; (b) integrating the vehicle roll rate to obtain the vehicle roll angle increment; (c) determining the vehicle state on the basis of the input signals; (d) determining the vehicle estimated lateral acceleration, corresponding to the vehicle true roll angle, on the basis of at least the vehicle state, vehicle lateral acceleration and the centrifugal acceleration; (e) determining the vehicle estimated roll angle on the basis of at least the vehicle roll angle increment, the vehicle estimated lateral acceleration and the vehicle state; and (f) generating an output activation signal determining a possibility of rollover of the vehicle, as a function of at least: vehicle estimated roll angle and the vehicle roll rate.
Abstract:
The present invention relates to a safety logic unit (1) for vehicle rollover detection systems comprising a main rollover detection logic unit (2) and at least one protection device for the occupant or occupants of a vehicle and a method of determining near rollover situations. The safety logic unit (1) is connected with the vehicle lateral acceleration sensor (11) and generates the output signal appointing situation near rollover event when the lateral acceleration of a vehicle exceeds the first predefined threshold value (15) or, when the lateral acceleration of a vehicle exceeds the second predefined threshold value (16) that is lower than the first predefined threshold value (15) and if at the same time at least one of the additional activation signals of the safety logic unit (1) is present. An additional activation signal of the safety logic unit (1) is preferably delivered by the main logic unit (2) at an intermediate stage of path of processing of the signal.