Abstract: An apparatus for controlling an operation of a linear compressor by which an instablel phenomenon caused due to a characteristics deviation of parts of a compressor is corrected to stabilize the operation of the system, thereby accomplishing an optimal operation. Also, when the tuning instability occurs due to the characteristic deviation and the assembly deviation of the mechanic unit of the compressor, and the parts deviation in the control circuit such as the sensorless stroke estimator, the compressor deviation is corrected by using a relative coordinate value. And, while the linear compressor is being operated with the stroke command value according to the cooling mode, in case that the current stroke is in an unstable state, the stroke command value is lowered down as much as a predetermined value, with which the linear compressor is operated for a predetermined time. Then, when a predetermined time lapses, it is operated with the original stroke command value, thereby evading the instablel state.

Abstract: Apparatus and method for determining the condition of the floor to be cleaned by a cleaning robot. The apparatus comprises an ultrasonic wave signal transmitting circuit for transmitting an ultrasonic wave signal to an ultrasonic wave signal transmitter under the control of a microcomputer, a receiving amplifying unit for amplifying the ultrasonic wave signal transmitted from the ultrasonic wave signal transmitter and received in a ultrasonic wave signal receiver, a receiving demodulating unit for smoothing the output signal from the receiving amplifying unit to demodulate it and then apply it to the microcomputer. According to the control of the microcomputer, the ultrasonic wave signal is transmitted for a predetermined period. The period from the time when the ultrasonic wave signal is transmitted to the time when the ultrasonic wave signal is received in the ultrasonic wave signal receiver is measured.

Abstract: An automatic cooking control system for a microwave over which utilizes a microcomputer for controlling the whole operation of a microwave oven. An electric power source and magnetron are used for generating microwave energy. Fans are disposed at an air inlet and an air outlet of a heating chamber. The air temperature of inflow and outflow are detected and converted by analog/digital converters into the digital signals. The system performs an initial operation process, first stage heating process, and second stage heating process to complete a full automatic cooking process. The system performs calculations to determine the parameters to be used in second stage heating process according to a temperature variation in ambient air around a microwave oven. This change could be due to the change in season or even a change during the operation of the microwave oven. This results in optimum cooking without regard to the temperature variation in ambient air around a microwave oven.

Abstract: An automatic cooking control system for a microwave oven which utilizes an initial operation process that shifts a temperature of inflow air stored in memories to other memories and repeatedly stores a present inflow air temperature in another memory until the present detected inflow air temperature is equal to the temperature stored in the memory. This initial process also determines a temperature variation in the inflow air and a temperature difference between the air flowing in and out. A temperature compensating portion is obtained from the temperature variation and difference, which is used to establish a temperature increment by dividing the temperature compensating portion into a predetermined temperature increment. The microwave oven then utilizes a first stage heating process until the temprature of the air flowing from a heating chamber is raised as much as the compensated temperature increment.