对利用低温位热能来驱动的几种制冷装置性能进行了比较，以喷射式制冷为基础，以HCFC - 123为工质的制冷装置是比较理想的新型空调用制冷装置。
Through comparing on performance of some refrigeration drived by potential energy of low temperature. A new refrigeration based on jet compress with HCFC-123 is found.
第三，选用发动机电控系统传感器，设计了对应的信号处理电路和电控燃料喷射器电磁阀的驱动电路。
Third, the signal processing circuits were designed for the selected engine sensors and the drive circuit for the electromagnetic valve of electronically controlled injector.
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