Browse Publications Technical Papers 2019-26-0037
2019-01-19

DFSS to Design Engine Cooling System of Small Gasoline Vehicle with Rear Engine. 2019-26-0037

The aim of this paper is to strategies thermal protection of the rear mounted engine and it’s components of a vehicle having engine and radiator with cooling fan mounted in rear of the car. In automobile design, a rear-engine design layout is mainly found in small, inexpensive cars and light commercial vehicles chosen for three reasons - packaging, traction, and ease of manufacturing. For simple packaging and efficient thermal management, a radiator is located close to the engine. The thermal management of rear mounted engine in a car is very critical as engine compartment does not get enough surrounding air for cooling. Also when radiator is mounted in the rear, the rate of heat transfer for a radiator surface area reduces due to less available source air. Poor hot-air scavenging from engine compartment in case of rear engine also impact coolant heat exchange rate. The above concerns calls for puller type fan with higher fan wattage with more duty cycle operation. This novel monitoring strategy takes care of optimum utilization of fan, protect/enhance engine compartment’s components life, and ensures low electrical power consumption with better vehicle drive-ability (by ensuring fan disengagement based on vehicle parameters, battery voltage and vehicle takeoff condition). It also ensures the safety of components in the event of fan failure by diagnosing failure mode and restricting the vehicle maneuver by triggering limp-home. This paper is about designing a distinctive engine overheat protection strategy which safeguard engine, engine compartment and heat critical components packaged in engine compartment. Strategy safeguard in all vehicular operative conditions i.e. city drive, highway drive, maximum velocity, trailer towing uphill at low vehicle speed, idle and hot shut-down. The objective of this strategy is validated on fleet cars and meeting safety critical requirements to protect the engine and heat critical components from the damage caused due to the coolant temperature exceeding safe thresholds.

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