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Cooling and preheating device

  • US 7,267,084 B2
  • Filed: 01/18/2006
  • Issued: 09/11/2007
  • Est. Priority Date: 07/19/2003
  • Status: Expired due to Fees
First Claim
Patent Images

1. A cooling and heating device for an internal combustion engine (6) which has coolant inlet ports (4, 5) and a coolant return port (10), said device comprising a main coolant pump (1) for supplying a coolant to the internal combustion engine (6) via the coolant inlet ports (4, 5), a first flow control unit (3) for controlling the coolant flow to the coolant inlet ports (4, 5), a second flow control unit (17) arranged in a coolant return line (10) from the engine (6), said second flow control unit (17) directing the coolant, depending on the temperature thereof, to an inlet of the main coolant pump (1) either via a large cooling circuit (20) including an air/fluid cooler (21) or via a small cooling circuit (18) bypassing the air/fluid cooler (21),a transmission oil heat exchanger (24) through which both the coolant and transmission oil flow anda third coolant flow control unit (27) for controlling the coolant flow through the transmission oil heat exchanger in order to heat the transmission oil in the transmission oil heat exchanger (24), a coolant flow conduit extending from the return flow line (10) of the internal combustion engine (6) through the transmission oil heat exchanger (24) for heating the transmission oil and a coolant line extending from a return flow opening of a low-temperature region (23) of the air/fluid cooler (21) to the transmission oil heat exchanger (24) for transferring heat from the transmission oil to the coolant,said third flow control unit (27) directing the flow of coolant through the transmission oil heat exchanger (24) starting from a predefined coolant temperature for heating the transmission oil when the engine is warmed up and directing coolant from the low temperature region (23) of the air/fluid cooler (21) through the transmission oil heat exchanger (27) when the transmission oil needs cooling, and said third flow control unit (27) further including a valve disk (26) with a bypass bore (34) through which, in a cooling phase, a limited amount of coolant returning from a heating circuit line (12) is permitted to flow back to the main coolant pump (1), while the flow control unit (27) directs the coolant flows from the low temperature region (23) of the air/fluid cooler (21) via the transmission oil heat exchanger (24) back to the main coolant pump (1).

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