US 6,981,545 B2 | ||
Disconnectable heat exchanger | ||
Daniel Damson, Ditzingen (Germany); and Reiner Hohl, Stuttgart (Germany) | ||
Assigned to Robert Bosch GmbH, Stuttgart (Germany) | ||
Appl. No. 9/913,562 PCT Filed Dec. 07, 2000, PCT No. PCT/DE00/04352 § 371(c)(1), (2), (4) Date Oct. 18, 2001, PCT Pub. No. WO01/44739, PCT Pub. Date Jun. 21, 2001. |
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Claims priority of application No. 199 60 929 (DE), filed on Dec. 17, 1999. | ||
Prior Publication US 2002/0157810 A1, Oct. 31, 2002 | ||
Int. Cl. G05D 23/00 (2006.01) |
U.S. Cl. 165—297 | 5 Claims |
1. An internal combustion engine, comprising a main exhaust-gas flow, a heat exchanger arranged in said main exhaust-gas flow and having exhaust-air ducts with an exhaust-gas inlet and an exhaust-gas outlet, said heat exchanger having a plurality of cooling ducts with a coolant inflow and a coolant return; a shutoff device provided in said coolant inflow; a gas reservoir connected with said coolant ducts at a high point, and operative so that when said shutoff device is closed and an upper limit temperature of the coolant is reached, gas is directed from said gas reservoir into said coolant ducts and displaces the coolant from said heat exchanger, and the gas is returned to said gas reservoir shortly before said shutoff device is opened; an actuator acting on said gas reservoir; and a control unit connected with said shutoff device and with said actuator and operative so that when said shutoff device is closed and the upper limit temperature of the coolant is exceeded, said control unit acts on said gas reservoir so that gas is supplied from said gas reservoir and the coolant is forced from said heat exchanger shortly before opening of said shutoff device. |