Warming-up system for internal combustion engines
 A combustible mixture fed into the engine is heated by engine exhaust gases, the throttle valve is forcefully opened, ignition timing of the engine is retarded, cooling of the engine coolant and circulation thereof through the cooling circuit is interrupted and intake air is heated by exhaust gases during cold engine operation. 
Nissan Motor Co., Ltd.
F Y F
F02M Y02T F01P
inventional additional inventional
Masaaki Kenji
Saito Masaki