Abstract:
A viscosity sensor for, e.g., outputting a signal representing the viscosity of engine oil has one or more piezoelectric diaphragms disposed in a fluid chamber (28) of a housing (20). An elongated amplification channel (30) is formed in the housing (20) and extends away from the chamber (28). The diaphragm can be excited to induce fluid movement that in turn induces the diaphragm to output a sensor signal representative of the viscosity of the fluid.
Abstract:
A sensing assembly senses a level of a fluid in a reservoir. The sensing assembly includes a first input port for receiving a first input voltage signal. The sensing assembly also includes a second input port for receiving a second input voltage signal. An excitation circuit is electrically connected to the first and second input ports for receiving the first and second input voltage signals and for generating a first excitation signal and a second excitation signal. A receiving circuit is disposed adjacent the excitation circuit and defines a variable capacitance with the excitation circuit. The receiving circuit produces an output voltage variable with the level of the fluid in the reservoir due to capacitance changes between the excitation circuit and receiving circuit. The receiving circuit includes first receiving electrode configured to effect linear capacitance change with fluid level and a second receiving electrode configured to effect second order linear capacitance change with fluid level. The receiving circuit produces an output voltage signal variable with the level of liquid in the reservoir due to capacitance changes between the excitation circuit and the receiving circuit due to dielectric changes created by the liquid.
Abstract:
A sensor ( 46 ) for sensing the angular position of a rotatable body ( 10 ) including a stationary transmitter plate ( 12 ) with at least one transmitter electrode ( E, F ), a stationary receiver plate ( 14 ) with at least a first and a second receiver electrode ( A, B, C, D ), and a rotor ( 16 ) formed of a dielectric material and positioned between the facing electrodes ( A , B, C, D, E, F ) of the plates ( 12, 14 ). The rotor ( 16 ) is smaller than the plates ( 12, 14 ) and rotates with the rotatable body ( 10 ) to change the capacitance between the transmitter electrode(s) ( E, F ) and opposed receiver electrodes ( A, B, C, D ). The induced voltages on the receiver electrodes ( A, B, C, D ) indicate the angular position of the rotatable body ( 10 ). Preferably, the sensor ( 46 ) uses a square waveform signal and two transmitter electrodes ( E, F ) receive signals 180 degrees out of phase. Then, four receiver electrodes ( A, B, C, D ) forming two receiver pairs ( AC, BD ) are connected so that the current flowing between each pair is measured and converted to a voltage. A lookup table compares the values of the voltage pairs to known values ( 46, 48 ) from calibration, giving the angular position.
Abstract:
A viscosity measurement apparatus (10), or viscometer, including a fluid flow channel (12), a heating element (14) disposed at least around an exterior portion of the fluid flow channel (12) near an inlet end (22), and a temperature sensor (16) disposed within the fluid flow channel (12) downstream from the heating element (14). The viscometer (10) may also include a thermally insulating jacket (18) disposed around the heating element (14) and the fluid flow channel (12). A method of measuring viscosity with the viscometer (10) includes immersing a fluid flow channel in the fluid, heating a portion of the fluid in the fluid flow channel (12) near the inlet end (22) of the fluid flow channel (12), and measuring a temperature of the fluid in the fluid flow channel (12) at a position downstream from the inlet end (22) of the fluid flow channel (12). The method further includes recording temperature changes of the fluid for a time period and comparing recorded temperature change characteristics to known fluid viscosities to determine viscosity.
Abstract:
An apparatus 10 monitors at least one fuel quality characteristic of fuel passing through a fuel delivery system 12 of a motor vehicle. The apparatus 10 includes a fuel rail assembly 18 connectable to the fuel delivery system 12 of the motor vehicle. A fuel rail assembly 18 has at least one housing 14 associated with either a pressure regulator or an accumulator. A sensor is associated with the fuel rail assembly 18 for measuring at least one characteristic of fuel quality of fuel passing through the fuel rail assembly 18 . At least one characteristic includes temperature and/or impedance. The sensor 16 can include a pair of plates 20, 22 spaced from one another by a gap of between approximately 0.5 mm to approximately 1.0 mm, inclusive, for measuring impedance across the gap.
Abstract:
A tire pressure sensor with power generator (22) includes a spool (26) having a coil (30) wound therearound. Within the spool (26) is a pole piece (28). The tire pressure sensor (22) is installed in a wheel (12) that rotates with respect to a brake clamp (18). The brake clamp (18) includes a magnetic strip (80) that the sensor (22) moves past as the wheel (12) rotates. As the tire pressure sensor (22) moves past the brake clamp (18), the magnetic strip (80) causes the coil (30) to output an AC voltage signal. A rectifier circuit (42) connected to the coil (30) converts the AC voltage to DC voltage. The DC voltage is stored in a storage capacitor (44) to be used as needed by an air pressure sensing element (52) connected thereto.
Abstract:
An oil change sensing system (10) for an internal combustion engine (30), having an oil pressure sensor (14) adapted to provide an oil pressure signal to an engine control module (12); an oil temperature sensor (16) adapted to provide an oil temperature signal to the engine control module; wherein the engine control module comprises an algorithm (70, 170) which determines the oil's viscosity by using the measured oil temperature and oil pressure and the determined oil viscosity and a fresh oil viscosity are used to determine whether the oil is in a preferred operating range.
Abstract:
A control circuit for a vehicle for, e.g., chassis leveling or other purposes includes a controller (12) selectively sending drive signals to a load (14) through a switch FET (M1), and a BJT having a collector connected between the switch FET (M1), an emitter connected to ground, and a base connected to a current view resistor for short circuit protection. An over power protection FET (M2) is connected to the controller (12) and to the base of the short circuit protection transistor (Q1), with the gate of the over power protection FET (M2) being connected to the output of the switch FET (M1). A time delay capacitor is connected from the base of the BJT to ground. With this structure, if a ground fault causes the BJT to turn on, and if the drain-source voltage of the switch FET (M1) exceeds the gate threshold voltage of the overpower protection FET, the overpower protection FET is turned on, resulting in turning off the switch FET (M1) and, hence, avoidance of high power draw through the switch FET (M1).
Abstract:
A pressure control valve assembly (10) includes a linear actuator (12) portion and a hydraulic portion (14). The linear actuator (12) includes an improved plunger (72) that has an enlarged diameter portion (106 OD ) near the secondary plate (80). The linear actuator (12) further includes a plunger-to-primary plate interface that has a double step (130, 132) magnetic configuration, which increases the force developed on the plunger (72).
Abstract:
A viscosity sensor for, e.g., outputting a signal representing the viscosity of engine oil has one or more piezoelectric diaphragms disposed in a fluid chamber (28) of a housing (20). An elongated amplification channel (30) is formed in the housing (20) and extends away from the chamber (28). The diaphragm can be excited to induce fluid movement that in turn induces the diaphragm to output a sensor signal representative of the viscosity of the fluid.