Method for vehicle data dependent range measurement from a vehicle
AssigneeITT Manufacturing Enterprises, Inc.
InventorsAnton Lill, Jochen Kiemes, Joachim Mathes
Life of this patent
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Abstract
The invention concerns an ultrasound parking aid system which emits warning signals when an echo signal lying within an audibility window exceeds a given threshold value. Hitherto, an audibility window or the sensitivity of the system was adapted to fixed data of the vehicle and/or the roadway. According to the invention, the sensitivity, audibility window or even the emission response is adapted as a function of varying dynamic data of the vehicle or roadway.
Claims5
A method for range measurement of obstacles from a vehicle with the aid of an echo method, in which a transmitted signal is reflected by a signal illuminated object to the vehicle in the form of an echo, and, in the vehicle, a warning signal is triggered during a timed listening window as a function of a threshold value of a receiver, characterized by the steps of:
- making one of the time position and the duration of the transmitted signal and the progression of the threshold value in time during the listening window a function of spatial parameters of the vehicle, the spacial parameters describing at least one of the spacial dimensions, and the movement of the vehicle, and the state of the vehicle.
A range measurement device for range measurement of obstacles from a vehicle using an echo method in which a transmitted signal is reflected by a signal illuminated object to the vehicle in the form of an echo, the device comprising:
- at least one electro-acoustical transducer for emitting an ultrasonic signal and subsequently receiving an ultrasonic signal reflected from the object, having a receiving stage for echo signals detected by the transducer and a control unit which sets the transmission period of the transducer, a subsequent settling time of the transducer, a listening window for reception of reflected echo signals and, a dead reception time until the next activation of the transducer, a threshold circuit provided in the receiving stage, the threshold circuit possessing a time-dependent threshold value during the duration of the listening window which causes a warning signal only if the receiving value exceeds a certain threshold value, at least one of the transmission period and the transmitting power of the transducer, and the duration and the position of the listening window, and the time-dependence of the threshold value is a function of the parameters relating to at least one of the dynamics of vehicle movement and the spatial parameters of the vehicle.
Dependencies are inferred from the claim text.