Abstract:
An interfacial force microscope includes a differential-capacitance displacement sensor having a tip mounted on an oscillating member. The sensor generates displacement signals in response to oscillations of the member. A scanner is adjacent the sensor and supports a sample to be imaged. The scanner is actuable to move the sample relative to the sensor to bring the tip into intermittent contact with said sample as the member oscillates. A controller is in communication with the sensor and the scanner. The controller includes a sensor feedback circuit receiving the displacement signals and an AC setpoint signal. The AC setpoint signal has a frequency generally equal to the frequency at the peak of the displacement versus frequency curve of the sensor. The output of the sensor feedback circuit is applied to the sensor to oscillate the member. The controller also provides output to the scanner in response to the displacement signals to control the separation distance between the sensor and the sample.
Abstract:
The invention characterizes a seat occupant. Sensors in the seat determine the position of a seat occupant relative to the seat. The position of the seat relative to the vehicle combined with the position of the seat occupant relative to the seat determines the location of the seat occupant relative to the vehicle. The seat occupant is characterized by the magnitude and Q of capacitance between electrodes in the seat and other indications. Situations wherein airbag deployment is not desired are identified. The position of the occupant relative to the seat, the weight of the seat occupant, whether the seat belt is latched, the track position and recline angle of the vehicle seat and vehicle deceleration during a crash are combined with capacitance and other measurements to estimate the position of the occupant relative to a possible deploying airbag as the occupant moves toward the airbag during a crash.
Abstract:
The invention characterizes a seat occupant. The position of a seat occupant relative to the seat is determined and the position of the seat relative to the vehicle determines the location of the seat occupant relative to the vehicle. The position and other characteristics of the seat occupant are determined from the magnitude and Q of capacitance between electrodes in the seat, thereby distinguishing between a seat occupied by a normally seated person and certain other circumstances wherein deployment of airbags is not desired. The position of the occupant relative to the seat, the weight of the seat occupant, whether the seat belt is latched, the track position and recline angle of the vehicle seat and vehicle deceleration during a crash are used to estimate the position of the occupant relative to a deploying airbag as the occupant moves toward the airbag during the crash.
Abstract:
A system for determining the weight of the occupant of a vehicle seat includes a hinge near the forward edge of the seat and a force sensor responsive to downward force at a point well to the rear of the hinge thereby indicating torque about the hinge. The occupant weight sensing system is particularly responsive to weight applied to the rearward part of the seat and is less responsive to weight applied to the forward edge of the seat thereby being less affected by the weight of the lower legs and feet of a normally seated adult. The force sensor is preferably of the type that converts mechanical force to fluid pressure and provides a force signal from a pressure sensor responsive to the fluid pressure. The system includes a microprocessor connected for receiving the output of the force sensor. The microprocessor may, optionally, also receive outputs from an accelerometer responsive to vertical accelerations, a seat back recline angle sensor and a seat track position sensor. In a first embodiment a seat cushion rests on a platform and the platform rotates about a hinge. The force sensor indicates the torque applied to the platform about the hinge. In a second embodiment the entire seat frame rotates about a hinge and the force sensor indicates the torque applied to the seat about the hinge. In the first embodiment the microprocessor determines the weight of the seat occupant from the outputs of the force sensor and the seat back recline sensor. In the second embodiment the microprocessor determines the weight of the seat occupant from the outputs of the force sensor, the seat back recline sensor and the seat track position sensor. The microprocessor may use an accelerometer to establish whether the force being sensed derives from seat belt tension applied to a child seat or from the weight of an adult.
Abstract:
A pump system is disclosed which operates at high efficency in either a high volume, low pressure mode or a low volume, high pressure mode. First and second internal gear pumps are driven by a common drive shaft. The first pump has a smaller displacment than the second pump and both pumps deliver pressurized fluid to a common discharge passage. An unloading valve is operative to dump the output of the second pump in response to fluid pressure in the discharge passage so that it delivers fluid to the load device only when the pressure is below a predetermined value. The unloading valve also performs the function of a low capacity accumulator. A check valve is provided to prevent back flow in the outlet of the second pump.
Abstract:
A pump system is disclosed for delivering hydraulic fluid to a load device, such as a hydraulic brake system. The system automatically switches from larger displacement to smaller displacement as pressure at the outlet increases. The pump system comprises one or more lower pressure pumps and a high pressure pump with an actuator driving all pumps simultaneously. An unloading valve is coupled with each lower pressure pump for dumping the output thereof in response to pressure of the fluid delivered to the load device. The actuator comprises an electromagnetic linear motor which imparts an intake stroke to the pumps and stresses a spring which releases stored energy for imparting the pressure stroke to the pumps.
Abstract:
Sensors in a vehicle seat provide data for classifying occupants. Information from the sensors may be used to determine the position of an occupant relative to the seat and relative to the vehicle, the weight of the occupant, whether the seat belt is latched, and the position of the occupant relative to an airbag before and during a crash. Situations wherein airbag deployment is not desired are identified. A particularly inexpensive system meets the occupant classification needs of a system comprising a low risk deployment passenger airbag.
Abstract:
An interfacial force microscope includes a differential-capacitance displacement sensor having a tip mounted on an oscillating member. The sensor generates displacement signals in response to oscillations of the member. A scanner is adjacent the sensor and supports a sample to be imaged. The scanner is actuable to move the sample relative to the sensor to bring the tip into intermittent contact with said sample as the member oscillates. A controller is in communication with the sensor and the scanner. The controller includes a sensor feedback circuit receiving the displacement signals and an AC setpoint signal. The AC setpoint signal has a frequency generally equal to the frequency at the peak of the displacement versus frequency curve of the sensor. The output of the sensor feedback circuit is applied to the sensor to oscillate the member. The controller also provides output to the scanner in response to the displacement signals to control the separation distance between the sensor and the sample.
Abstract:
A load cell particularly useful for a seat occupant weight sensing system includes a liquid filled chamber and a pressure sensor providing an electric signal indicating the pressure in the liquid. Four load cells supporting a seat provide four signals that are added to determine the weight of the seat occupant. The load cell comprises two flanged conical springs stressed to provide preload. One of the springs also forms part of the surface of the liquid filled chamber. The two springs operate in concert to resist side forces and moments. The load cell is responsive to both compressive and tensile forces while being substantially unaffected by lateral forces and moments. A seat belt tension sensor may be included to measure seat belt tension. Preferred manufacturing methods provide low cost,
Abstract:
Apparatus and methods are disclosed that promote greater polishing uniformity in linear CMP systems by introducing a relative lateral motion between a CMP belt and a rotating polish head securing a wafer. A belt polish module comprises a linear CMP belt forming a loop around an idle roller and a drive roller, first and second pistons engaging, respectively, first and second ends of the idle roller, and a controller configured to vary the forces applied by the first and second pistons to the ends of the idle roller in order to laterally translate the linear CMP belt. A method for linear CMP comprises rotating a wafer about a vertical axis, contacting the rotating wafer against a linear CMP belt moving in a longitudinal direction, and causing a relative lateral motion between the rotating wafer and the linear CMP belt.