Tokuji Yoshikawa

77GHz Low-Cost Single-Chip Radar Sensor for Automotive Ground Speed Detection

A new 77 GHz single-chip radar sensor has been developed, which encapsulates a GaAs p-HEMT transceiver MMIC with an on-chip patch antenna in a resin-molded package integrated with a resin collimating lens on the top to achieve an EIRP of 13.5 dBm and a receiving gain of 8 dB. The packaged sensor, measuring 6.5times4.4times6.0 mm3 with only DC and baseband- frequency leads, offers ease of handling with an extreme low-cost potential for a variety of applications. When adopted to an automotive ground speedometer integrated with an signal processing unit, the sensor demonstrated accurate and reliable detections of vehicle speed with a standard deviation of 1.5% under normal driving conditions.

AN ADAPTIVE CRUISE CONTROL USING WHEEL TORQUE MANAGEMENT TECHNIQUE

In this paper, the authors present a longitudinal control method with an adaptive cruise control system that uses a wheel torque management technique. A speed controller and a headway controller are added to the system, based on the wheel torque management technique. The speed control feature does not require the use of tuning parameters. Test results of the control system are reported.