Internal-combustion engines – With heating means
Patent
1997-04-04
1998-09-15
Solis, Erick R.
Internal-combustion engines
With heating means
123 4114, F02N 1706
Patent
active
058064796
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
An arrangement for an additional heater in the coolant circuit of an internal combustion engine is disclosed in EP-B-0 462 154 by co-assignee. In this known arrangement, a fuel heater is integrated with the heating element of a heating system for heating the passenger compartment of a motor vehicle. Specifically the coolant-side part of the heat exchanger of the heater is in flow connection with the water tank of the heating element, so that the heat produced by the heater is given off via the exhaust gas to the coolant in the heating element and thus becomes directly effective for heating the passenger compartment. The disadvantage in this arrangement is that both the fuel supply for the additional heater and the supply of exhaust gas from the additional heater have to pass through the passenger compartment or directly at the edge of the passenger compartment, which is not desirable. Moreover, the noise of the burner and the burner fan may lead to adverse effects on the comfort in the passenger compartment.
SUMMARY OF THE INVENTION
The object of the present invention is to avoid the abovementioned disadvantages and to provide an arrangement for an additional heating device that does not adversely affect safety and comfort and can take over the function of shortening the hot running phase of the internal combustion engine and the function of stationary mode heating.
This object can be achieved by a coolant/air radiator assembly for cooling an internal combustion engine of a motor vehicle, where the engine is a primary heater. The assembly comprises a radiator for cooling the engine and an additional or secondary heater integrally mounted to the radiator and communicating with the radiator so that fluid from the radiator can flow through the secondary heater. The advantage in this arrangement on the radiator or on a cooling module is that safety risks and adverse effects due to noise for the passenger are avoided insofar as the additional heater is now located outside the passenger compartment. Owing to the constructional integration with the coolant/air radiator, the entire assembly and also the accessibility of the additional heater are simplified. Furthermore, the inclusion of the additional heating in the coolant circuit can be designed in a simpler and cost-effective manner. Additionally, the fuel and exhaust gas lines can be installed without difficulty.
Further advantageous aspects of the invention emerge from the following.
According to another aspect of the invention, the additional heater is integrated with the water tank of the radiator, which is preferably configured as a cross flow radiator. This results in a favorable arrangement of the additional heater in terms of space, keeping the constructional height of the overall radiator low. By accommodating the additional heater in the pot-shaped housing on the water tank, no further fastening means are required.
According to another aspect of the invention, no further connection lines for the coolant are required either since the latter enters the heat exchanger part of the additional heater directly from the water tank.
According to another aspect of the invention, the thermostat valve and the radiator bypass line are also integrated in the water tank, which leads to a further simplification in respect of the coolant lines, to a compact constructional unit and to efficient assembly of the overall cooling module.
According to another aspect of the invention, integration of the additional heater is even possible in the case of a down flow radiator, i.e., with pipes running vertically, if there is adequate constructional space available.
According to another aspect of the invention, the additional heater is connected in parallel with the radiator feed line, i.e., a partial flow defined by a throttle runs in the bypass over the additional heater, heats up there and is then fed back into the radiator feed line. This variant is thus self-regulating, i.e., without additional regulating outlay.
According to another aspect o
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Bauer Dieter
Humburg Michael
Loehle Michael
Pfister Wolfgang
Reiser Peter
Behr GmbH & Co.
J. Eberspaecher GmbH & Co.
Solis Erick R.
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