FR2832188A1 - I.c. engine cooling circuit has heat exchanger with branch that can be separated from circuit and/or regulated by valve - Google Patents

Abstract

The cooling circuit (1) for an i.c. engine with a cylinder head (8) and a crankcase (10), has a coolant fluid pump (3), a water-filled radiator (2) with a coolant pump (3) connected to it, and a heat exchanger (4). The heat exchanger has a branch (6) that can be incorporated in or separated from the circuit by a control valve (7') that reacts to coolant fluid pressure and/or temperature. A coolant outlet (4.2) from the heat exchanger is connected to the pump (3) through a second valve (7)

Description

<Desc / Clms Page number 1>

The invention relates to a cooling circuit of an internal combustion engine having a cylinder head and a crankcase or crankcase, comprising a coolant pump, a water radiator associated with the cooling pump, and a heating heat exchanger.

It is certainly known from DE 44 00 201 A1, an internal combustion engine cooled by a fluid, with a cooling of the lubricant and lubrication agent, an oil radiator through which the cooling fluid and a bypass to bypass the oil radiator, as well as a valve regulating the bypass thermostatically. In this case, the bypass is provided in the oil radiator oil circuit and the amount of oil entering the oil radiator is regulated or interrupted by the valve operating only in the case of high load and only in the temperature of the cooling fluid. Regulation of the coolant circuit is not provided.

The object of the invention is to configure and arrange a cooling circuit so as to ensure optimum cooling and heating of the important parts as to the efficiency and the exhaust gas.

According to the invention, this object is achieved, on the one hand, by virtue of the fact that the heating heat exchanger has a bypass which can be switched on or off and / or controlled by throttling, via at least a first valve that can be controlled and / or regulated. The heating heat exchanger has a very high resistance to flow, so that for a rotational speed

<Desc / Clms Page number 2>

 critical engine or a critical engine temperature, it is not possible to guarantee optimum cooling of the cylinder head. Thanks to the solution according to the invention, it is possible that the bypass opens at a temperature of the cooling fluid to be determined empirically, and that there is then a larger coolant flow for the cylinder head , namely for its cooling circuit.

For this purpose, it is advantageous that the valve is made as a closing valve responsive to pressure and / or temperature and connected to a cooling fluid inlet of the heating heat exchanger, and / or a cooling fluid outlet of the heating heat exchanger is connected to the coolant pump via a second valve.

A cooling fluid inlet or a coolant outlet of the heating heat exchanger may have a second valve or be connected thereto. The heating heat exchanger can thus be put into or out of service respectively or controlled by throttling, regardless of the pressure of the bypass and / or depending on the temperature.

Furthermore, the aim is also achieved by the fact that a coolant outlet of the crankcase is connected to a cooling fluid inlet of an oil cooler, a cooling fluid inlet of a cylinder head , a cooling fluid inlet of the heating heat exchanger and / or at least a first distributor. It is thus possible, after the cold start, to decouple the cylinder head. The fluid flow of

<Desc / Clms Page number 3>

refroidissement traverse le radiateur à huile et ensuite l'échangeur de chaleur de chauffage, sans s'écouler à travers la culasse. La culasse atteint ainsi plus rapidement sa température de fonctionnement, et en raison des pièces importantes quant au rendement et aux gaz d'échappement, qui sont échauffées plus rapidement, on garantit un déroulement de combustion optimal précoce. Les circuits de refroidissement du cartermoteur et de la culasse sont sélectivement découplés.

cooling passes through the oil radiator and then the heat exchanger heating, without flowing through the cylinder head. The cylinder head thus more quickly reaches its operating temperature, and because of the important parts as to the efficiency and the exhaust gases, which are heated up more rapidly, an early optimal combustion process is ensured. The cooling circuits of the crankcase and the cylinder head are selectively decoupled.

It is advantageous for this purpose, that the first distributor is realized as a 4/2 distributor or as a 3/2 distributor, and connects the cooling fluid outlet of the crankcase or a cooling fluid outlet from the oil cooler to the coolant inlet of the cylinder head or to the coolant inlet of the heat exchanger.

According to an advantageous configuration for this purpose, the first distributor comprises, disposed in a distributor chamber, a first distributor closing body which can be moved into two positions, which in a first position I closes a first inlet channel of flow, and in a second position II closes a second flow inlet channel, a coolant outlet of the distributor chamber being connected to the cooling fluid inlet of the heating heat exchanger. The cooling fluid outlet of the cylinder head is connected to the first flow inlet channel and the oil radiator coolant outlet and the cylinder head cooling fluid inlet are connected to the second channel. flow inlet. The dispenser obturating body can be actuated and moved by means of an organ

<Desc / Clms Page number 4>

 actuating element and comprises a return element made in the form of a spring for the second position II.

It is thus possible, in the first position I, to send the flow from the coolant outlet of the oil cooler to the cooling fluid inlet of the heating heat exchanger, by simply passing through the continuously open cooling fluid outlet from the first distributor. In the first position I, the cooling fluid outlet of the cylinder head and thus its flow of cooling fluid are blocked, so that said cylinder head can quickly reach its operating temperature. The return element made as a spring ensures, in the event of system failure, a forced flow through the cylinder head in position II and thus a reliable cooling capacity in operation.

It is particularly significant for the present invention that the coolant pump has a short-circuit circuit between its coolant inlet and its coolant outlet, and that the coolant inlet or the coolant pump coolant outlet has a second manifold, the second manifold connecting the coolant pump coolant outlet to the short circuit circuit or the engine coolant circuit. internal. In this way, the temporarily inoperative coolant pump only delivers a short-circuit coolant flow and thus does not unnecessarily absorb the power of the internal combustion engine, for proper sizing of the short section. -circuit.

<Desc / Clms Page number 5>

Furthermore, the second distributor is advantageously designed as a 4/2 distributor or a 3/2 dispenser that can be controlled and / or regulated, and the second dispenser comprises a dispenser closure body, which can be moved into a position I closing a short-circuit channel between the cooling fluid inlet and the cooling fluid outlet of the coolant pump, and in a position II releasing the short-circuit channel. A return element made in the form of a spring and intended for the position I of closure, is provided in addition to an actuating member.

In the closed position of the short circuit channel, there is a pressure ratio between the suction side and the discharge side, namely between the water radiator cooling fluid outlet and a cylinder head cooling fluid inlet. In the open position II, the suction channel and the discharge channel of the coolant pump are short-circuited, so that cooling fluid flow is not generated. The return spring element ensures, in the event of a system failure, the closure of the short-circuit channel and thus a reliable operating coolant flow between the water heater and the cylinder head.

In this context, it is advantageous that the heating heat exchanger and the cooling fluid pump each have a parallel in parallel, which can be turned on or off by a valve, the bypass being performed as a short-circuit circuit with at least one thermostat, and the oil cooler being selectively in operative connection directly with the cylinder head and / or with

<Desc / Clms Page number 6>

 the heating heat exchanger.

Other advantages and details of the invention will be explained in the description which follows, with reference to the accompanying drawings, which show: FIG. 1 a schematic diagram of a cooling circuit with a bypass for a heating heat exchanger, with a short-circuit circuit for a coolant pump and a shorted cylinder circuit, FIG. 2a schematic diagram of a 4/2 distributor with a valve closure body in a first position, FIG. 2b a block diagram of a 4/2 distributor with a valve closure body in a second position, FIG. 3 a sectional representation of a valve or short circuit distributor for a coolant pump.

In Figure 1 is shown a cooling circuit 1 of an internal combustion engine. The cooling circuit 1 comprises a water radiator 2, a coolant pump 3, an oil cooler 5 and a heat exchanger for heating. The internal combustion engine comprises a cylinder head 8 and a crankcase or crankcase 10 with corresponding coolant channels. Between the crankcase 10 and the cylinder head 8 is provided a coolant passage 10.5 so that coolant can pass from the crankcase 10 into the cylinder head 8. In addition, a coolant outlet 10.2 of the motor housing 10 is connected to the oil radiator 5. The

<Desc / Clms Page number 7>

 oil radiator 5 is, for its part, connected, via a first distributor 9, optionally, directly to a cooling fluid inlet 8. 1 of the cylinder head 8 or a coolant inlet 4.1 of a heating heat exchanger 4, the cooling fluid flow being connected via a coolant outlet 8.2 of the cylinder head 8 to the first distributor 9. The cooling fluid outlet 4.2 of the heat exchanger heating heat 4 has a valve 7 for opening the cooling fluid outlet 4.2. In parallel with the heating heat exchanger 4, there is provided a bypass 6 which also has a valve 7 'for closing.

Depending on the pressure drop or the temperature of the cooling fluid flow, it is thus possible to close the heating heat exchanger 4 and / or the bypass 6 of the heating heat exchanger 4. It is also possible to It is planned to be able to carry out the cooling circuit without the oil cooler 5. In this case, the coolant outlet 10.2 of the crankcase 2 is connected directly to the first distributor 9.

Through the coolant outlet 8.4 of the cylinder head, it is connected to the water radiator 2 whose coolant outlet 2.2 is connected, in common with the cooling fluid outlet 4.2 of the heating heat exchanger 4 or bypass 6, at a cooling fluid inlet 3.1 of the coolant pump 3. By means of the coolant pump 3, namely its cooling fluid outlet 3.2, the coolant arrives again in the internal combustion engine, namely in its crankcase 10.

<Desc / Clms Page number 8>

The coolant pump 3 has a short-circuit circuit 21, which can be switched on or off via a second distributor 11. Within the short circuit circuit 21 is a thermostat 20 '. which serves as regulator for the second distributor 11.

The cooling fluid flow can thus, by means of the coolant pump 3, be forced through the complete cooling system and / or only through the short-circuit circuit 21.

The cooling fluid flow inside the internal combustion engine is divided into a cooling fluid flow of the cylinder head 8 and a coolant flow of the crankcase 10. The cooling fluid outlet 8.2 of the cylinder head 8 is here connected, via the first distributor 9, to the heating heat exchanger 4, a coolant outlet 8.4 of the cylinder head 8 being connected to the water radiator 2. Inside this pipe A thermostat 20 is provided which opens or activates a cooling fluid inlet 2.1 of the water heater 2 only at a sufficient cooling fluid flow temperature.

Through the first distributor 9, the coolant flow is sent, from a coolant outlet 5.2 of the oil cooler 5, directly into the coolant inlet 8.1 of the cylinder head 8 and from there, via the coolant outlet 8.2, into the heating heat exchanger 4, or, without passing through the cylinder head 8, directly from the cooling fluid outlet

<Desc / Clms Page number 9>

 5.2 of the oil cooler 5 in the coolant inlet 4.1 of the heating heat exchanger 4.

FIG. 2a shows the first distributor 9 as a 4/2 distributor (4 orifices, two positions) in a first position I. The first distributor 9 comprises a first flow inlet channel 13, a second inlet channel 14 and a coolant outlet 9.2. The first flow inlet channel 13 is here connected to the coolant outlet 8.2 of the cylinder head. The second flow inlet channel 14 is connected to the coolant outlet 5.2 of the oil cooler 5 and to the coolant inlet 8.1 of the cylinder head 8. The coolant outlet 9.2 of the first distributor 9 is here connected to the coolant inlet 4.1 of the heating heat exchanger 4. When the oil cooler 5 is not provided, the coolant inlet 8.1 of the cylinder head 8 can to be missing.

In this case, the cooling fluid flow is sent directly from the coolant outlet 10.2 of the crankcase 10 to the coolant outlet 9.2 of the first distributor 9.

According to FIG. 2a, a valve closing body 12 closes, in its position I, the first flow inlet channel 13, so that the flow of cooling fluid arrives directly from the cooling fluid outlet. 5.2 of the oil cooler 5 at the coolant inlet 4.1 of the heating heat exchanger 4. According to FIG. 2b, the distributor closure body 12 closes, in its position II, the second channel of flow inlet 14, so that

<Desc / Clms Page number 10>

l'écoulement de fluide de refroidissement est relié directement de la sortie de fluide de refroidissement 8. 2 de la culasse 8 à l'entrée de fluide de refroidissement 4. 1 de 11 échangeur de chaleur de chauffage 4, l'écoulement de fluide de refroidissement parvenant simultanément de la sortie de fluide de refroidissement 5. 2 du radiateur à huile 5 dans l'entrée de fluide de refroidissement 8. 1 de la culasse 8. Le corps d'obturation de distributeur 12 est relié à un ressort ou à un élément de rappel non représenté, de façon telle, qu'en cas de défaillance du système, le second canal d'entrée d'écoulement 14 soit fermé en garantissant ainsi un passage de l'écoulement de fluide de refroidissement à travers la culasse 8.

the cooling fluid flow is connected directly from the cooling fluid outlet 8 of the cylinder head 8 to the cooling fluid inlet 4 of the heating heat exchanger 4, the fluid flow of cooling simultaneously arriving from the coolant outlet 5 of the oil cooler 5 in the coolant inlet 8. 1 of the cylinder head 8. The valve closure body 12 is connected to a spring or a return element not shown, such that, in the event of system failure, the second flow inlet channel 14 is closed thus guaranteeing a passage of the cooling fluid flow through the cylinder head 8.

In FIG. 3, the coolant pump 3 has been shown in cross-section. Between the cooling fluid inlet 3. 1 and a cooling fluid outlet 3. 2 there is provided a short-circuit channel 17 which can be closed or throttled by means of a closure body 16 distributor or valve. Here it is disposed at the outlet of cooling fluid 3. 2, directly in front of an annular channel 22 of the coolant pump, and is held by a return element 18, namely a return spring, in a closing position I, so that in case of failure of the system, the closing of the shortcircuit channel 17 is ensured. In addition to the return element 18, the closure body 16 is connected, via an actuating pin 19. 1, to an actuating member 19 which moves the closure body 16 in accordance with the parameters of the cooling fluid flow, between the closed position I and an open position II. The short-circuit channel 17 is here of a partial circular or arc-shaped configuration of

<Desc / Clms Page number 11>

 circle, and connects the cylindrical cooling fluid inlet 3.1 to the cylindrical cooling fluid outlet 3.2 of the cooling pump 3. The actuating member 19 is here arranged directly outside the channel short circuit 17 and includes the actuating pin 19.1 which is connected directly to the closure body 16 via a bore 19.2. The coolant inlet 3.1 and the short-circuit channel 17 are here arranged in a separate housing portion 3 ', which is connected to the housing of the coolant pump 3. The closure body 16 s presses, in the closed position, on a support 16.1 of annular shape, the housing portion 3 '.

Claims (7)

CLAIMS 1. Cooling circuit (1) of an internal combustion engine having a cylinder head (8) and a crankcase or crankcase (10), comprising a coolant pump (3), a water radiator (2) associated with the cooling pump (3), and a heating heat exchanger (4), characterized in that the heating heat exchanger (4) has a bypass (6) which can be switched on or off switch off and / or be throttling regulated, via at least one first valve (7 ') that can be controlled and / or regulated. Cooling circuit according to Claim 1, characterized in that the valve (7 ') is designed as a closing valve which reacts with the pressure and / or the temperature and is connected to a cooling fluid inlet ( 4.1) of the heating heat exchanger (4), and / or in that a cooling fluid outlet (4.2) of the heating heat exchanger (4) is connected to the coolant pump (3) via a second valve (7). Cooling circuit according to one of the preceding claims, characterized in that the coolant pump (3) has a short-circuit circuit (21) between its coolant inlet (3.1) and its outlet. cooling fluid (3.2). Cooling circuit according to Claim 3, characterized in that the fluid inlet of <Desc / Clms Page number 13>  cooling (3.1) or the cooling fluid outlet (3.2) of the cooling fluid pump (3) comprises a distributor (11), said distributor (11) connecting the cooling fluid outlet (3.2) of the cooling pump cooling fluid (3) to the short circuit circuit (21) or to the cooling fluid circuit of the internal combustion engine. 5. Cooling circuit according to claim 4, characterized in that said distributor (11) is designed as a 4/2 distributor or 3/2 distributor can be controlled and / or regulated. Cooling system according to claim 4 or 5, characterized in that said distributor (11) comprises a valve closing body (16), which can be brought into a position I closing a short-circuit channel (17). ) between the cooling fluid inlet (3.1) and the cooling fluid outlet (3.2) of the coolant pump (3), and in a position II releasing the short-circuit channel (17), a return element (18) made in the form of a spring and intended for the closing position I, being provided in addition to an actuating member (19). Cooling circuit according to one of the preceding claims, characterized in that the heating heat exchanger (4) and the coolant pump (3) each have a parallel (6, 21) be turned on or off by a valve (7, 11), the bypass (21) being formed as a short-circuit circuit (21) with at least one thermostat (20 '), and the oil cooler (5). ) being <Desc / Clms Page number 14>  selectively in direct connection directly with the cylinder head (8) and / or with. the heating heat exchanger (4).