초록 ▼

A ratiometric temperature controller for a transport refrigeration system, and a method of controlling the load temperature of a transport refrigeration system with digital signals, without the necessity of utilizing a digital computer. The method, implemented by the ratiometric controller, includes

A ratiometric temperature controller for a transport refrigeration system, and a method of controlling the load temperature of a transport refrigeration system with digital signals, without the necessity of utilizing a digital computer. The method, implemented by the ratiometric controller, includes the steps of providing an analog ratio between the load temperature and a selected set point temperature, converting the analog ratio to a digital signal, and providing a logic array which is programmed to provide a plurality of transport refrigeration system control signals in response to predetermined values of the digital signal.

대표청구항 ▼

A method of controlling the load temperature of a transport refrigeration system with digital signals, comprising the steps of: selecting a set point temperature, sensing the load temperature of the transport refrigeration system, providing an analog ratio between the set point temperature and the l

A method of controlling the load temperature of a transport refrigeration system with digital signals, comprising the steps of: selecting a set point temperature, sensing the load temperature of the transport refrigeration system, providing an analog ratio between the set point temperature and the load temperature, converting the analog ratio to a digital signal having a predetermined number of bits, providing a logic array programmed to provide a plurality of transport refrigeration system control signals in response to predetermined values of the digital signal, programming the logic array to provide a true first in-range signal when the load temperature sensed by the sensing step is within a predetermined temperature range, which range includes the set point temperature selected by the selecting step, timing the duration of the true first in-range signal, and providing a second in-range signal which goes true when the first in-range signal remains true for a predetermined period of time, and delaying at least one predetermined additional timing function of the transport refrigeration system until the second in-range signal goes true.