公开(公告)号：US4628739A

公开(公告)日：1986-12-16

申请号：US717240

申请日：1985-03-11

申请人： Gerhard Bruggen ,  Dieter Karr ,  Wolfgang Rottler ,  Ilan Brauer

发明人： Gerhard Bruggen ,  Dieter Karr ,  Wolfgang Rottler ,  Ilan Brauer

IPC分类号： F01N3/02 ,  B01D50/00 ,  B01D51/00 ,  B01D51/02 ,  B01D51/10 ,  B03C3/017 ,  B03C3/155 ,  B03C3/41 ,  B03C3/64 ,  B03C3/70 ,  B03C3/82 ,  F01N3/01 ,  G01L11/00

CPC分类号： F01N3/01 ,  B03C3/0175 ,  B03C3/64 ,  B03C3/70 ,  B03C3/82 ,  B03C2201/30 ,  Y02T10/20

摘要： A piezoelectric device for measuring the pressure of a gas like medium comprises two oscillators disposed opposite to each other in a substantially closed system by intermediate introduction of the gas to be measured. The measuring is performed by defining a transfer factor from the first piezoelectric oscillator to the second piezoelectric oscillator, whereby the first piezoelectric oscillator is definitely excited and the measuring signal is picked up by the second piezoelectric oscillator.

摘要翻译： PCT No.PCT / DE84 / 00114 Sec。 371日期1985年3月11日 102（e）1985年3月11日PCT提交1984年5月19日PCT公布。 出版物WO85 / 00425 1985年1月31日。用于测量气体介质的压力的压电装置包括通过中间引入待测量气体在基本封闭的系统中彼此相对设置的两个振荡器。 通过将第一压电振荡器的转移系数定义为第二压电振荡器来进行测量，由此确定地激发第一压电振荡器，并且测量信号由第二压电振荡器拾取。

公开(公告)号：US4561064A

公开(公告)日：1985-12-24

申请号：US470467

申请日：1983-02-28

申请人： Gerhard Bruggen ,  Dieter Karr ,  Wolfgang Rottler

发明人： Gerhard Bruggen ,  Dieter Karr ,  Wolfgang Rottler

IPC分类号： G01S7/40 ,  G01S7/52 ,  G01S13/06 ,  G01S13/93 ,  G01S15/14 ,  G01S15/93 ,  G08G1/00

CPC分类号： G01S15/931 ,  G01S15/14 ,  G01S7/52004 ,  G01S2007/52009 ,  Y10S367/902 ,  Y10S367/909

摘要： To determine if a pulsed beam system, typically an ultrasonic pulsed beam system, which is located externally of a motor vehicle is in operative condition, a transmitter (14) projects a beam to a fixed reflector (16) located on the vehicle, and one (19) of a group of timing stages (18; 19, 20, 21) evaluates the transit time to the reflector. If the transit time to the reflector is slightly less than a predetermined time interval (Tc), so that the threshold timing level (Tc) is passed, a first indication, for example a frequency at a first tone (f1), generated by an acoustic tone generator (30) is reproduced in a loudspeaker; if, then, an obstruction is sensed by the beam, and the distance between the transmitter (14) and the obstruction (17) which forms a reflecting object drops below a first predetermined distance represented by a time period (T2), a second one of the transit time stages responds, and, through logic gates (22-24, 28, 29) provides a second discrete output frequency (f2) in the loudspeaker. If the vehicle closely approaches the reflecting object or obstruction (17), a third frequency (f3) is reproduced by the loudspeaker (26) and, additionally, a warning signal can be given. The system can be connected to the reverse gear or rear light switch, so that, if no obstruction is sensed, and only the signal from the reflector is reproduced, an audible indication of "reverse gear engaged" is provided, thus simultaneously providing a reverse gear signal as well as a signal representative of proper operation of the system. To compensate for ambient condition, dirt on the transmitters, and the like, the timing intervals by the transit time stages responding to the obstruction can be changed (FIG. 2) by providing a calibrating input based on actual transit time from the transmitter (14) to the fixed reflector (16).