Abstract: An improved position measuring system for determining a vehicle's position by receiving radio waves emitted from satellites is shown. The system adopts successive approximation using a convergent computation, in which initially estimated values are computed.

Abstract: A seat belt retractor comprises a take-up shaft which is spring biased in a belt retracting direction; a planetary gearing having a sun gear nonrotatably mounted to the take-up shaft, a ring gear and a planet pinion; a mechanical tensionless mechanism which prevents the planet pinion from orbiting in the same direction as the belt retracting direction; and a motor actuated slack control mechanism meshing with the ring gear, wherein the tensionless state is established by preventing the orbiting movement of the planet pinion and the slack control is effected by rotating the ring gear.

Abstract: An air-conditioning method and system for an automotive vehicle for controlling passenger compartment air temperature under comfortable air control conditions, that is, under comfortable outlet duct air volume and temperature according to the perception of individual passengers, once the control conditions are adjusted by the passenger. The air-conditioning system according to the present invention comprises, in addition to a microcomputer, a temperature sensor, a temperature preset device, and the like, a blower-fan motor speed selector manually operated by the passenger, a non-volatile memory unit for storing the manually-adjusted blower-fan motor speeds classified on the basis of difference between detected air temperature and preset air temperature, vehicle travelling conditions, and the time elapsed since the system was turned on.