Method and device for determining the position and/or the movement of an object
AssigneeRobert Bosch GmbH
InventorMatthias Karl
Life of this patent
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Abstract
In a method for determining the position and/or the movement of at least one object in the surroundings of a vehicle with the aid of at least one transmitted acoustic signal, the time behavior of at least one electrical signal of an electroacoustic transducer during the transmission of the acoustic signal and/or during a decay of the electroacoustic transducer following the transmission and/or during the reception of the acoustic signal reflected on the object is analyzed at least during a suitable fraction of a signal period in such a way that changes of the electrical signal of the electroacoustic transducer is detected.
Claims10
A method for determining at least one of a position and a movement of at least one object in the vicinity of a vehicle, the method comprising:
- transmitting at least one acoustic signal using an electroacoustic transducer;
- receiving the acoustic signal reflected off of the object;
- analyzing one of:
- (a) the acoustic signal reflected off of the object;
- and (b) the time behavior of at least one electrical signal of the electroacoustic transducer during at least one of (i) the transmission of the acoustic signal, (ii) a decay of the electroacoustic transducer following the transmission of the acoustic signal, and (iii) the reception of the acoustic signal reflected off of the object, wherein the analyzing is performed at least during a selected fraction of a signal period so that a change of the electrical signal of the electroacoustic transducer is detectable;
- and
- determining, via a determination device, wherein the analysis device provides the electrical signal of the electroacoustic transducer to the determination device as an input signal, at least one characteristic signal parameter of the electrical signal of the electroacoustic transducer, and wherein the determination device includes at least one of:
- (i) a first threshold value switch;
- (ii) a derivative element and (iii) a second threshold value switch;
- wherein the determination device includes a first changeover switch which is switchable from a first changeover position into a second changeover, wherein the determination device is configured to transfer the input signal to a second capacitor in a first changeover position, and to switch over to a second changeover position, upon detecting with the second threshold value switch, the time of occurrence of at least one of a minimum signal strength and a maximum signal strength of the input signal.
A surroundings detection device for determining at least one of a position and a movement of at least one object in the vicinity of a vehicle, comprising:
- an electroacoustic transducer transmitting at least one acoustic signal using and receiving the acoustic signal reflected off of the object;
- a sampling device;
- an analysis device analyzing one of:
- (a) the acoustic signal reflected off of the object;
- or (b) the time behavior of at least one electrical signal of the electroacoustic transducer during at least one of (i) the transmission of the acoustic signal, (ii) a decay of the electroacoustic transducer following the transmission of the acoustic signal, and (iii) the reception of the acoustic signal reflected off of the object, wherein the at least one electrical signal of the electroacoustic transducer is one of time-continuous or discretized with respect to time with the sampling device, and wherein the analyzing is performed at least during a selected fraction of a signal period so that a change of the electrical signal of the electroacoustic transducer is able to be detected;
- and
- a determination device, wherein the analysis device provides the electrical signal of the electroacoustic transducer to the determination device as an input signal, wherein the determination device determines at least one characteristic signal parameter of the electrical signal of the electroacoustic transducer, and wherein the determination device includes at least one of:
- (i) a first threshold value switch;
- (ii) a derivative element and (iii) a second threshold value switch;
- wherein the determination device includes a first changeover switch which is switchable from a first changeover position into a second changeover, wherein the determination device is configured to transfer the input signal to a second capacitor in a first changeover position, and to switch over to a second changeover position, upon detecting with the second threshold value switch, the time of occurrence of at least one of a minimum signal strength and a maximum signal strength of the input signal.
Dependencies are inferred from the claim text.