Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P7/00—Controlling of coolant flow
  • F01P7/14—Controlling of coolant flow the coolant being liquid
  • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
  • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P3/00—Liquid cooling
  • F01P3/02—Arrangements for cooling cylinders or cylinder heads
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P3/00—Liquid cooling
  • F01P3/02—Arrangements for cooling cylinders or cylinder heads
  • F01P2003/021—Cooling cylinders
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P3/00—Liquid cooling
  • F01P3/02—Arrangements for cooling cylinders or cylinder heads
  • F01P2003/024—Cooling cylinder heads
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P3/00—Liquid cooling
  • F01P3/02—Arrangements for cooling cylinders or cylinder heads
  • F01P2003/027—Cooling cylinders and cylinder heads in parallel
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P5/00—Pumping cooling-air or liquid coolants
  • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
  • F01P5/12—Pump-driving arrangements
  • F01P2005/125—Driving auxiliary pumps electrically
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P7/00—Controlling of coolant flow
  • F01P7/14—Controlling of coolant flow the coolant being liquid
  • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P2060/00—Cooling circuits using auxiliaries
  • F01P2060/08—Cabin heater

Definitions

• the invention relates to a cooling circuit for an internal combustion engine.
• the cooling of an internal combustion engine in a motor vehicle takes place via a cooling medium which circulates in a cooling circuit which in a conventional manner runs through the internal combustion engine, a heating heat exchanger for heating a passenger compartment of the vehicle, a pump and a cooler for delivering the waste heat of the internal combustion engine to the Surrounding area.
• the cooling medium first enters channels in the engine block, flows through it in a longitudinal direction, then passes through a cylinder head of the internal combustion engine and then reaches the radiator. A part of the coolant flow flowing through the engine can be tapped via a branch line and fed to the heating heat exchanger.
• the total volume flow of the coolant is determined by the delivery rate of the pump and the Pressure drops in the cooling circuit.
• the distribution of the coolant flow at the location of the branch leading to the heating heat exchanger is also determined by the pressure losses.
• the present invention provides a cooling circuit for an internal combustion engine which allows the cooling power to be varied in different range of the engine to optimally adapt to the actual cooling requirement. This means that sufficient cooling under all operating conditions can be guaranteed even with a pump with a reduced delivery rate. In addition, since less heat needs to be removed as a result of the selective cooling, the cooler can be dimensioned smaller. This saves space and costs, and the energy consumption of a vehicle equipped with the cooling circuit is reduced.
• the advantage is achieved with the aid of a distributor for dividing the coolant flow over a plurality of parallel channels of the internal combustion engine.
• the individual channels preferably supply areas of the engine with different cooling requirements.
• the coolant supply can be "vertically" differentiated by arranging one channel in the engine block of the internal combustion engine and a second channel in the cylinder head. It is particularly expedient for tribological reasons to open the engine block a higher temperature level than the cylinder head area, in the latter a lower temperature is required for combustion reasons and because of the narrow material webs.
• a "horizontal" differentiation can also be achieved by assigning different parallel coolant channels to the inner and outer cylinders of the engine, the internal the more heat-loaded cylinder are supplied with more coolant than the outer ones.
• the ratio of the distribution of coolant to the various channels through the distributor can be predetermined by its design, the distribution ratios being expediently determined by the designer of the internal combustion engine in accordance with a cooling requirement predicted for the various areas of the engine.
• the distributor be adjustable during operation of the internal combustion engine, in particular that a control device adjusts the distributor in each case in accordance with a desired temperature distribution in the internal combustion engine.
• the distributor can be designed as a mixer, that is to say its total passage cross section is essentially constant regardless of the distribution ratio set, and only the proportion of the connected parallel channels in the passage cross section varies with the distribution ratio; however, it can also comprise a throttle valve in one of two parallel channels, the passage cross section of which can be adjusted in order to set a desired distribution between the two channels.
• the attached figure shows schematically a cooling circuit according to the invention.
• the figure shows in the form of a block diagram an embodiment of a cooling circuit according to the invention.
• the cooling circuit comprises two cooling channels 4, 5, which run parallel to each other through an engine block 2 or a cylinder head 3 of an internal combustion engine 1.
• the parallelism of the cooling channels 4, 5 is of course not to be seen in the narrow geometric sense, the channels are understood to be parallel here if they start from a common starting point and meet again at a common point and each carry part of the total coolant flow.
• the cooling duct 5 runs through a heating heat exchanger
• the heating heat exchanger is arranged in the cooling duct 5 because of it
• Run-on temperature is generally higher and its throughput is greater than that of the cooling channel 4 of the cylinder head.
• the two cooling channels 4, 5 combine to form a “hot line”
• the mixer 9 divides the hot cooling water flow into a first partial flow, which is led to the cooler 11, and a second partial flow, which is led via a bypass line 10 parallel to the cooler 11 and is reunited with the first partial flow after the latter has passed the cooler 11 has gone through.
• a thermostat 8 monitors the temperature of the cooling water in the hot line 7 and regulates the distribution ratio of the mixer 9 and thus the cooling capacity of the cooler 11 so that a predetermined target temperature is not exceeded.
• a “cold line” 12 leads from the cooler 11 or the bypass 10 to an electrically operated coolant pump 13.
• the cooling water passes through a distributor 14, which divides it into the two cooling channels 4, 5.
• the distribution ratio in the distributor 14 is controllable, a control signal for this purpose is supplied by a control unit 15 which monitors the temperature of the motor 1 and which also regulates the delivery rate of the pump 13.
• This control unit 15 can be a circuit specially provided for this purpose, which is connected to temperature sensors (not shown in the figure) for detecting temperatures of the engine block and the cylinder head or the cooling water emerging therefrom and which Distribution ratio of the distributor 14 sets so that none of these temperatures exceeds a predetermined maximum, the maximum for the cylinder head 3 being specified lower than for the engine block 2.
• the temperature can also be determined in other ways, for example by measuring an average cooling water temperature , as recorded in a conventional manner in motor vehicles and displayed on the dashboard, and measuring the temperature of the cylinder head 3. diglich that there are several temperature measurements corresponding to the number of cooling channels, which allow a conclusion to the flow rate of the cooling water, which is required for each cooling channel to ensure adequate cooling.
• the measurement of the oil temperature of the internal combustion engine can also be considered.
• the control unit 15 can also be integrated in a conventional engine control unit, which takes on various control tasks, such as the setting of the air / fuel mixture, for the internal combustion engine and is connected to temperature sensors for this purpose.
• a control device In order to implement the control unit in such a control device, it may be sufficient to equip it with an additional port for the control of the distributor and to extend a program executed by the control device by the steps required to calculate a distribution ratio of the distributor 14 on the basis of the Temperature measurements are required.
• the invention is not limited to the case of two cooling channels. Depending on how differentiated the control of the engine cooling should be, the number of channels can be increased as required.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
• Cylinder Crankcases Of Internal Combustion Engines (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7918427

Family Applications (1)

Country Status (6)

Families Citing this family (21)

Family Cites Families (6)

• 1999
  • 1999-08-14 DE DE19938614A patent/DE19938614A1/de not_active Ceased
• 2000
  • 2000-08-05 BR BR0006998-1A patent/BR0006998A/pt not_active Application Discontinuation
  • 2000-08-05 EP EP00963871A patent/EP1121515A1/de not_active Withdrawn
  • 2000-08-05 WO PCT/DE2000/002616 patent/WO2001012963A1/de not_active Application Discontinuation
  • 2000-08-05 KR KR1020017004589A patent/KR20010085912A/ko not_active Application Discontinuation
  • 2000-08-05 JP JP2001517036A patent/JP2003507617A/ja active Pending

Non-Patent Citations (1)

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