Nippon Soken, Inc.

Nippondenso Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Gifu Shatai Kogyo Kabushiki Kaisha

Junji Kitagawa

Shigeyuki Akita

Sigeyuki Akita

Kouichi Yamanoue

Sotoo Kitamura

Akira Nakamura

Norimichi Kasegawa

Akira Kuno

Akira Fukami

Teiichi Nabeta

Toshitaka Fujiwara

Kenji Isaka

Mitsuharu Shirahama

Junji Mizuno

Takuo Yanagihara

Kazuhiro Narusaka

Yasuhiko Mori

Reinforced construction for rear wheel housing in automobile, and

A signal transmission system has a plurality of sensors, a plurality of modulation circuits connected to the sensors, a single demodulation circuit and a single power supply line for connecting the modulation circuits to the demodulation circuit. Each of the sensors has a resistor-capacitor type oscillation circuit of which the capacity varies with the variation of a physical quantity to be measured and outputs an oscillation output of the oscillation circuit as a sensor signal. Each of the modulation circuit has a one-shot circuit having a predetermined set time different from another one-shot circuit of another modulation circuit for sustaining the sensor signal for the predetermined set time. Each of the modulation circuits further has a transistor for switching and a zener diode of a zener voltage different from that of another zener diode of another modulation circuit. The transistor connects the zener diode to the electric power line to lower the voltage of the electric power line to the zener voltage when the sensor signal is inputted. The demodulation circuit has a plurality of comparators and a logic circuit. Each of the comparators compares the voltage of the power supply line with a reference voltage to generate a comparison signal. The logic circuit performs a logical operation of the comparison signals from the comparators to obtain the sensor signals at different output terminals.

Signal transmission system

A portable transmitter for transmitting a magnetic signal is disclosed. The transmitter is provided with a transmitting coil for generating a magnetic signal upon receiving an electric current from a dry cell through an intermittently operating electric current supplying transistor. The transmitter further comprises a capacitor, a charging line provided with a diode, and a switching transistor. The switching transistor makes the induced current which is generated in the transmitting coil, flow into the capacitor by way of the charging line when the electric current supply to the transmitting coil is stopped, and supplies the electric current stored by the capacitor to the transmitting coil when the electric current supply to the transmitting coil is started.

Portable transmitter which conserves transmitter power by storing

A sensing apparatus including: a first electrode member; a second electrode member arranged at opposing positions a predetermined distance away and electrically isolated from the first electrode member; and an electric circuit connected to the first and second electrode members. The first and the second electrode members are operatively connected by an impedance formed between the first and the second electrode members in response to existence of a substance to be sensed between the first and the second electrode members. The electric circuit outputs a signal in response to the impedance. The sensing apparatus is applicable for detecting, for example, the level of a liquid in a vessel.

Sensing apparatus

A luggage door unlocking device for a vehicle, capable of unlocking the luggage door of the vehicle without using an unlocking key includes a portable signal transmitter for transmitting an unlocking signal; signal receiving device provided on the vehicle, for receiving and discriminating the unlocking signal; and a driving device which drives an unlocking mechanism on the basis of the received and discriminated unlocking signal. The signal receiving device has a magnetic sensor, a smoothing circuit which smoothes the reception signal provided by the magnetic sensor and provides a smoothed signal, and a comparator which receives the reception signal and the smoothed signal and allows the reception signal to pass only when the signal level of the reception signal changes beyond the signal level of the smoothed signal. The noise overlapping the reception signal is eliminated by the comparator, whereby an unlocking signal including no noise is fed to the driving device.

Luggage door unlocking device for vehicle

A luggage door unlocking device for a vehicle by which a luggage door of vehicle can be unlocked without using an unlocking key is disclosed. The device includes a portable transmitter for generating an unlocking signal, a receiver which is mounted on a vehicle for receiving and discriminating the unlocking signal when the transmitter approaches the receiver and a luggage door unlocking mechanism for operating an unlocking mechanism of the vehicle when the receiver receives the unlocking signal. The transmitter has a walk detector for detecting the periodical vibrations when the person carrying the transmitter is walking which generates a walk detecting signal. Also, a switch turns on or off upon receiving the walk detecting signal from the walk detector. In the luggage door unlocking device, the transmitter having the switch which is turned off upon receiving the walk detecting signal, the transmitter begins to generate the unlocking signal just after the person carrying the transmitter stops walking so that the luggage door is automatically unlocked just after he stops walking.

Luggage door unlocking device

An electric wiring system has a plurality of terminal units, a plurality of sensors connected to the terminal units by signal input lines, and a central control unit connected to the terminal units by a pair of common power supply lines, which receive signals from the sensors. The central control unit has a reference signal generator circuit which repetitively generates a reference signal composed of a train of pulses, a predetermined number of which are assigned to each of the sensors, a modulator circuit for applying the reference signal to the power supply lines, a demodulator circuit for picking up a composite signal generated by the terminal unit from the power supply line, and a control circuit for detecting abnormal and normal signals of the sensors and breakage of the power supply lines and signal input lines based on the presence and absence of high-frequency pulses in the composite signal, thus indicating sensor and line conditions. Each of the terminal units has a demodulator circuit for picking up the reference signal from the power supply lines, a composite signal generator circuit for generating the composite signal by adding the high-frequency pulses at pulse positions corresponding to the pulses of the reference signal assigned to the sensors, dependent on the abnormal and normal signals of the sensors and breakage of the signal input lines, and a modulator circuit for applying the composite signal to the power supply lines.

Electric wiring system having a plurality of sensors

A device for detecting the amount of liquid in a vessel, such as a fuel tank of an automobile, using a torsion support member such as a torsion bar arranged between the vessel and the body of the automobile. The torsion displacement of the member corresponding to the amount of the liquid is detected in a detection circuit and processed in an electronic unit which includes a portion for generating a pulse width signal corresponding to the amount of the liquid on the basis of signals from the detection circuit, a portion for generating a signal having a pulse number proportional to the pulse width on the basis of the generated pulse width signal, and a portion for averaging at predetermined intervals the value corresponding to the pulse number of the signal from the pulse width detection portion using timing pulses generated at predetermined intervals and for displaying the average amount of the liquid digitally on a display portion.

Device for detecting liquid amount in a vessel

A torque sensor generates an electric signal representing a change in the state of electromagnetic or electrostatic coupling between first and second rotors coupled together by a torsion spring. The change is caused with relative rotation of the two rotors caused by detected torque in a power assisted steering system of an automotive vehicle.

Torque sensor

A frequency transmission system comprises a pulse train generator and a signal converter. The pulse train generator generates a pulse signal of a sufficiently short duration in response to oscillation frequency signals, and the signal converter circuit converts the pulse signal into a current signal and blunts the waveform of the converted signal by a capacitor to transmit through power supply lines.

Current frequency waveform transmitting on D.C. power lines

An electric liquid level detector of the condenser type comprises an electrode assembly including a pair of electrodes to be submerged into the oil within a liquid container, an electric circuit assembly provided with an electric detecting circuit for generating an output signal indicative of the level of remaining oil in dependence upon an electro-static capacity between the electrodes, and a flexible tubular guide member of conductive material fixed at its one end to the electrode assembly and at its other end to the electric circuit assembly. The guide member is provided therein with an elongated partition plate of conductive material grounded together with the guide member, and the electrodes are connected to the detecting circuit by means of a pair of insulated electric wires extending through a pair of elongated spaces subdivided by the partition plate in the guide member.

Electric liquid level detector

A liquid quantity detecting device includes a float-type liquid-quantity meter and a torsion bar-type liquid meter. In the float-type liquid-quantity meter, the liquid quantity is detected by a float in a tank and the position of the float is converted to an electric signal by a variable resistor. The torsion bar-type liquid meter includes housings fixed to the tank, torsion bars, one end of each being fixed to the tank by the housings and the other end of each being fixed to a supporting member so that the torsion bars are twisted by weight of the tank, twisted angle detection means for detecting the twisted angle of the torsion bars, and an electrical processor for supplying a signal corresponding to the quantity of liquid in the tank after receiving a signal from the twisted angle detector. When the liquid quantity in the tank is larger than a predetermined quantity, the liquid quantity, for example, the quantity of gasoline in a gasoline tank, is measured by the floating-type liquid-quantity meter. When the liquid quantity in the tank is smaller than a predetermined quantity, the liquid quantity is displayed precisely and accurately by the torsion bar-type liquid meter.

Liquid quantity detecting device

In a liquid quantity detecting apparatus, a torsion bar is mounted on a stationary structure to support a container thereon in such a manner that the torsion bar is twisted at a torsional angle in dependence upon the weight of liquid stored within the container. An electric detector is provided to electrically detect the torsional angle of the torsion bar so as to generate an output signal indicative of the quantity of the stored liquid based on the detected torsional angle.

Liquid quantity detecting apparatus

A liquid level monitoring device includes a casing arranged to be immersed in liquid stored within a container, the casing having first and second ports and being integrally provided with a support member to be attached to the inner wall of the container. A flexible diaphragm is assembled to form first and second chambers in the casing, the first chamber being communicated with the atmospheric air through the first port from which an elongated tube extends into the exterior of the container, and the second chamber permitting the immerse of liquid through the second port thereinto such that an amount of the atmospheric air is compressed within the second chamber in dependence upon an amount of the stored liquid to flex the diaphragm by a pressure difference between the chambers. A pressure transducer is provided to detect the rate of flexure of the diaphragm so as to generate an electric signal indicative of the liquid surface level from a control circuit. An indicator is responsive to the electric signal from the control circuit to indicate the stored liquid surface level.

Growing community of inventors

Okazaki, Japan

Junji Kitagawa