JP2002332840A - Liquid-cooled reciprocating piston internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce total required amount of coolant by achieving cooling adapted to different heat generation amounts of a cylinder head and a cylinder block. SOLUTION: This liquid cooled reciprocating piston internal combustion engine 10 has a cooling chamber of the cylinder head 12 and a coolant chamber of the cylinder block 14 connected to a single cooling circulation passage 16 through separate inflow pipes 34 and 36, and the cooling circulation passage has a cooler 20 provided with at least one water pump 18 and a blower 24; the water pump 18 feeds coolant via a discharge pipe 32 to the both inflow pipes, and a control valve 42 for controlling volume flow in relation to a driving parameter of the reciprocating piston internal combustion engine 10 is arranged in at least one of the inflow pipe; and the cooling chamber of the cylinder head 12 and the coolant chamber of the cylinder block 14 are divided and connected mutually to a common circulating pipe 26 via separate outflow pipes 38 and 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cooling system in which a cooling chamber of a cylinder head and a cooling liquid chamber of a cylinder block are connected to each other through separate inflow conduits. Connected to a channel, the cooling circuit having at least one water pump and a cooler with a blower, the water pump pumping coolant through a discharge conduit to the two inlet conduits. A liquid-cooled reciprocating piston internal combustion engine of the type in which a metering valve for controlling the volume flow in relation to the operating parameters of the reciprocating piston internal combustion engine is arranged in at least one of the inlet conduits About.

[0002]

2. Description of the Related Art In a known reciprocating piston type internal combustion engine,
Excess heat is drawn off via the coolant. The coolant circulates in the cooling circuit and passes from an electrically or mechanically driven water pump to a reciprocating internal combustion engine via one supply conduit and from there to one return conduit. To the cooler, which cooperates with an electrically driven blower. Further, a heating circuit of a vehicle heating device or an air conditioner may be connected to the cooling circuit.

[0003] Generally in a cooling circuit, a bypass conduit connects the reflux conduit to the supply conduit. The bypass conduit bridges the cooler and opens into the supply conduit upstream of the water pump. At the junction of the bypass line from the reflux line, a three-way switching valve is arranged, which regulates the coolant flow and is controlled thermostatically or by a control unit. The control unit is connected via signal lines to a number of different sensors, which sense the operating and peripheral parameters of the reciprocating piston internal combustion engine and the cooling / heating circuit. From the input quantity, the adjustment quantity for the three-way valve is determined, and thus the flow rate of the coolant to the cooler or via the bypass conduit is determined.

In a cooling circuit known from US Pat. No. 5,121,714, a supply line branches into two inlet lines, one in the region of the cylinder head and the other. Are open to the reciprocating piston type internal combustion engine in the region of the cylinder block. In addition, the coolant flow is metered via valves arranged in the inlet conduit to the cylinder block. The valve position is controlled by a control unit which evaluates temperature measurements, especially in reciprocating piston internal combustion engines. The first temperature sensor measures the temperature of the coolant flowing out, and the temperature is used to globally elucidate the cooling state of the reciprocating piston internal combustion engine.
The second temperature sensor measures the temperature of the engine oil, and thereby detects the cooling state of the cylinder block area.

Since the valve is adjusted according to the measurement data,
A precisely specified partial quantity flows to the cylinder head and the cylinder block via separate inlet conduits. The coolant flows into the two regions according to the target position by separate flows, but is mixed again later. This is because the cooling passages allow one volume flow between the two regions and thus allow for the interchange of coolant. The temperature measurement of the mixed coolant does not represent the operating state of the individual areas of the reciprocating piston type internal combustion engine, and the control of the cooling circuit is dependent on the special temperature conditions of the reciprocating piston type internal combustion engine. Not exactly harmonized.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the total coolant demand by achieving cooling which is adapted to the different heating values of the cylinder head and the cylinder block.

[0007]

According to a first aspect of the present invention, a cooling chamber of a cylinder head and a cooling chamber of a cylinder block are separated from each other, and separate cooling pipes are provided through separate outflow conduits. In that they are connected to a common reflux conduit. The coolant flows via separate inlet lines, each having a metering valve therein, into the two regions of the reciprocating piston internal combustion engine and does not mix during the cooling operation. The coolant flow also leaves the reciprocating piston type internal combustion engine via separate outlet conduits.

The temperature readings in the outlet line of the cylinder head and in the outlet line of the cylinder block here represent the respective cooling operation without tampering. The two measurement results are processed in one control unit into adjustment quantities for the metering valve in the inflow conduits of the different areas, so that the amount of coolant flowing through is effectively adjusted to the area to be cooled. It is possible to adjust. In addition, it is possible to maintain the area of the cylinder head in an optimum temperature range by increasing the flow rate of the coolant, and in this case, the coolant is basically supplied to the cylinder block which does not need to be cooled so strongly. Do not recirculate in the same way.

In a preferred embodiment of the invention, the dosing valves in the inflow conduit can be controlled individually or jointly,
This not only reduces the coolant flow to one of the two regions of the reciprocating piston internal combustion engine at a number of operating points in accordance with the demand, but also reduces the total volume flow of the coolant. This was not possible with known cooling circuits. In an alternative embodiment, the dual valve is not located in the inlet conduit,
It is also possible to place it in the outflow conduit. With the coolant metering according to the invention, the reciprocating piston internal combustion engine can quickly reach its optimal operating temperature and maintain it over a wide operating range. This reduces fuel consumption and toxic emissions.

[0010] The drawings, the detailed description of the drawings and the appended claims include numerous combinations of components. Those skilled in the art can appropriately combine these constituent means individually or in other combinations.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in detail with reference to the drawings.

The reciprocating piston type internal combustion engine 10 is connected to a cooling circuit 16. Water pump 18 pumps coolant through discharge conduit 32 to reciprocating piston internal combustion engine 10 and from reciprocating piston internal combustion engine to return conduit 26.
Through to the cooler 20 which cooperates with the blower 24. From the cooler 20, the coolant flows back to the water pump 18 through the suction conduit 30. Coolant flow is indicated by arrows.

The discharge conduit 32 is connected to the first inflow conduit 3 communicating with the cylinder head 12 of the reciprocating piston type internal combustion engine 10.
4 and a second inflow conduit 36 communicating with the cylinder block 14 of the reciprocating piston type internal combustion engine 10. The cylinder head 12 and the cylinder block 14 have separate coolant chambers not shown in detail. Partition is broken line 4
6 suggested. The cylinder head 12 is the first
And the cylinder block 14 is connected to the common return line 26 via a second outlet line 40. Due to the separate coolant flows in the cylinder head 12 and the cylinder block 14, the coolant temperature in the outflow conduits 38, 40 causes the cylinder head 1
The heat generation amount in the cylinder block 2 and the cooling process in the cylinder block 14 and the cooling process are represented in an alternative manner.

Sensors (not shown) in the outlet conduits 38, 40 cooperate with a control unit, also not shown, and metering valves 42, 44 in the inlet conduits 34, 36 to couple the cylinder head 12 and cylinder The temperature behavior in block 14 is accurately determined.

Typically, a first or second inflow conduit 34,
Only the first metering valve 42 arranged in 36 is sufficient. By controlling the operation of the metering valve 42, the volume flow through the corresponding inflow conduit 34 or 36 is throttled, while the remaining volume flow discharged by the water pump 18 flows through the other inflow conduit 34 or 36. . However, by arranging the first metering valve 42 in the first inlet conduit 34 and the second metering valve 44 in the second inlet conduit 36, the total volume flow is reduced by both inlet conduits 34. , 36, it is possible to reduce the amount of coolant flowing through the reciprocating piston type internal combustion engine in the operating range where the calorific value is small. It is also possible to arrange the first and second metering valves 42, 44 in the outflow conduits 38, 40 downstream of the reciprocating piston type internal combustion engine rather than upstream.

The cooling circuit 16 may have a conventional structure in which a bypass conduit 28 and a heating heat exchanger 22 are connected in parallel with the cooler 20 between a reflux conduit 26 and a suction conduit 30. . A third metering valve 48, configured as a thermostat valve or as a valve operable by a control unit, meters the flow through the heating heat exchanger 22, the bypass conduit 28 and the cooler 20.
The cooling circuit 16 can also have additional heat exchangers for working equipment and accessories.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cooling circuit of a reciprocating piston type internal combustion engine.

[Explanation of symbols]

Reference Signs List 10 reciprocating piston type internal combustion engine, 12 cylinder head, 14 cylinder block, 16 cooling circuit, 18 water pump, 20 cooler, 22 heating heat exchanger, 24 blower, 26 return conduit, 28 bypass conduit, 30 suction conduit, 32 discharge conduits,
34,36 inflow conduit, 38,40 outflow conduit, 4
2,44 metering valve, 46 dashed line indicating partition, 48
Third metering valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Laurent Helinek, Germany Etisheim Schwalbenweg 7 (72) Inventor Martin Former, Germany Schuttgart-Wairimdorf Kaiserslauterer Strasse 64

Claims (4)

[Claims] A liquid-cooled reciprocating piston type internal combustion engine (1)
0), wherein a cylinder head (12) and a cylinder block (14) are provided, and the cylinder head (1) is provided.
The coolant chamber of 2) and the coolant chamber of the cylinder block (14) are connected to one cooling circuit (16) through separate inflow conduits (34, 36), and the cooling circuit is at least It has a water pump (18) and a cooler (20) with a blower (24), said water pump (18) delivering the cooling liquid via a discharge conduit (32) to said two inlet conduits (32). Metering valve (42) for pumping into the at least one inlet conduit (34, 36) and for controlling the volume flow in relation to the operating parameters of the reciprocating piston internal combustion engine (10). ) Is arranged, the cooling chamber of the cylinder head (12) and the cooling liquid chamber of the cylinder block (14) are separated from each other and through separate outflow conduits (38, 40). Connected to a common reflux conduit (26) Liquid-cooled reciprocating piston internal combustion engine (10). 2. A reciprocating piston internal combustion engine (10) according to claim 1, wherein a metering valve (42, 44) is provided in each of the two inlet conduits (34, 36). 3. The reciprocating piston type internal combustion engine (10) according to claim 2, wherein the two control valves (42, 44) can be controlled individually or together. 4. The two-way metering valve (42,44) is not in the inflow conduit (34,36) but in the outflow conduit (38,40).
The reciprocating piston internal combustion engine (10) according to claim 2 or 3, wherein the internal combustion engine (10) is arranged in the internal combustion engine.