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OPPORTUNISTIC TRANSMISSION COOLING STRATEGY FOR EPRNDL VEHICLES

IP.com Disclosure Number: IPCOM000245657D
Publication Date: 2016-Mar-24
Document File: 1 page(s) / 187K

Publishing Venue

The IP.com Prior Art Database

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OPPORTUNISTIC TRANSMISSION COOLING STRATEGY FOR EPRNDL VEHICLES

Transmission oil can over heat when a vehicle is towing a trailer and/or driving in prolonged low gear or is sitting in congested traffic. Hot climates exasperate the transmission oil heating phenomenon even more. Transmission oil overheating is detrimental to the transmission system itself as excessive heat can damage its internal parts. While some cars are equipped with external transmission coolers that circulate transmission oil into the heat exchanger and the oil is cooled by ram air and cooling fans, other vehicles may not have a transmission cooler, and hence need additional onboard countermeasures to cool the transmission fluid temperature. This issue is even more applicable to autonomous vehicles where there may not be a driver to view dash alerts and warnings.

Method

The ePRNDL is an electronic transmission system that offers unique opportunity of performing shift by wire of the transmission gears without a mechanical lever and may be used instances without an operator to perform a shift manually. The system is available in many high end vehicles.The transmission heats up more when under load (gears D, L1, L2, …). When in Park or Neutral, the load is removed and the transmission oil does not heat up as much.Upon determining the transmission oil is overheating as inferred by the Trans Oil temperature, the method looks for "opportunities" to cool the transmission oil by automatically dis...