WO2015146345A1 - Engine coolant circuit - Google Patents

Engine coolant circuit Download PDF

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Publication number
WO2015146345A1
WO2015146345A1 PCT/JP2015/053899 JP2015053899W WO2015146345A1 WO 2015146345 A1 WO2015146345 A1 WO 2015146345A1 JP 2015053899 W JP2015053899 W JP 2015053899W WO 2015146345 A1 WO2015146345 A1 WO 2015146345A1
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WO
WIPO (PCT)
Prior art keywords
cooling water
engine
exhaust gas
heat exchanger
path
Prior art date
Application number
PCT/JP2015/053899
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French (fr)
Japanese (ja)
Inventor
弘樹 成安
福田　健一
寛行 岡田
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ヤンマー株式会社
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Publication of WO2015146345A1 publication Critical patent/WO2015146345A1/en

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    • 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
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • 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
    • F01P2060/16—Outlet manifold
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an engine coolant circuit that cools an engine by circulating coolant.
  • Patent Document 1 discloses that exhaust heat of cooling water that has flowed out of an engine is radiated by a radiator and then exhausted from the engine by an exhaust gas heat exchanger. An engine cooling water circuit that exchanges heat with the engine and returns it to the engine is disclosed.
  • the temperature of the cooling water is detected, and whether or not an abnormality has occurred in the engine cooling water circuit is detected based on the detected temperature of the cooling water.
  • the coolant temperature detection when detecting the coolant temperature, the coolant temperature detection may be delayed. For example, when local boiling occurs in the exhaust gas heat exchanger when the amount of cooling water is reduced by stopping the cooling water pump or the like, the cooling water vaporized without heat exchange between the cooling water and the exhaust gas becomes high temperature. However, this high-temperature boiled water is detected by the water temperature sensor only after flowing downstream and liquefying. If it does so, the responsiveness of the abnormality determination of an engine cooling water circuit based on the temperature of a cooling water will deteriorate.
  • an object of the present invention is to present a configuration capable of performing abnormality determination of an engine coolant circuit that does not depend on the temperature of coolant.
  • the present invention is an engine cooling water circuit that circulates cooling water to cool an engine, and includes a radiator, an exhaust gas heat exchanger, an engine waste heat recovery device, and a cooling water pump.
  • an engine coolant circuit provided with a control unit.
  • FIG. 1 is a block diagram illustrating a schematic configuration of a cogeneration apparatus including an engine coolant circuit according to the present embodiment.
  • FIG. 2 is a perspective view of the engine coolant circuit and its peripheral portion in the cogeneration apparatus shown in FIG.
  • FIG. 3 is a perspective view of the engine coolant circuit and its peripheral portion in the cogeneration apparatus shown in FIG.
  • FIG. 4 is a block diagram showing a system configuration for controlling the abnormality determination of the engine coolant circuit by the control device.
  • FIG. 5 is a flowchart showing an example of a control operation for controlling the abnormality determination of the engine coolant circuit by the control device.
  • FIG. 1 is a block diagram showing a schematic configuration of a cogeneration apparatus 100 including an engine coolant circuit 200 according to the present embodiment.
  • 2 is a perspective view of the engine coolant circuit 200 and its peripheral portion in the cogeneration apparatus 100 shown in FIG.
  • FIG. 3 is a perspective view of the engine coolant circuit 200 and its peripheral part in the cogeneration apparatus 100 shown in FIG. 2 and 3, the front side is indicated by F.
  • the exhaust silencer 185 and the like are not shown in FIG. 2, and the exhaust silencer 185, the radiator 220, the three-way catalyst 130 and the like are omitted in FIG.
  • the cogeneration apparatus 100 electrically connects a commercial power system of an external commercial power source and a generated power system of the generator 120 to a power transmission system to a power consuming device (load), and obtains the demand power of the load. It is a system that covers and recovers waste heat generated by power generation and uses the recovered waste heat. That is, the cogeneration apparatus 100 includes an engine 110, a generator 120, an engine coolant circuit 200, and an engine waste heat recovery unit 230, and in addition to a power generation function that outputs generated power from the generator 120 driven by the engine 110.
  • a function of recovering the waste heat of the coolant circulated by the engine coolant circuit 200 and heated by heat exchange with the waste heat of the engine 110 by the engine waste heat recovery unit 230 (in this example, the waste heat of the coolant is It has a function to collect and use for hot water supply.
  • the engine coolant circuit 200 includes an exhaust gas heat exchanger 210 that performs heat exchange between the exhaust gas discharged from the engine 110 and the coolant discharged from the engine 110.
  • a radiator 220 (not shown in FIG. 3) that dissipates the waste heat of the cooling water flowing out of the exhaust gas heat exchanger 210, and an engine waste heat that recovers the waste heat of the cooling water flowing out of the exhaust gas heat exchanger 210.
  • the recovery unit 230, the engine 110, the exhaust gas heat exchanger 210, the radiator 220, and the engine waste heat recovery unit 230 are passed through the cooling water path 240 (specifically, the cooling water pipe) and the cooling water path 240.
  • the engine waste heat recovery unit 230 is a water / water heat exchanger that performs heat exchange between the cooling water and the hot water of the water heater 400 (see FIG. 1).
  • the engine coolant circuit 200 passes from the engine 110 via the exhaust gas heat exchanger 210 to the radiator 220 and / or the engine waste heat recovery unit 230 and passes through the water absorption part 251 of the coolant pump 250 (see FIGS. 1 and 2). ), A circuit for returning the coolant to the engine 110 is configured.
  • the engine cooling water circuit 200 is provided with a plurality of (two in this example) thermostat type switching valves 260 and 260 in parallel on the cooling water outlet 111 (see FIG. 1) side path of the engine 110.
  • electric three-way valves 270 and 270 are provided downstream of the thermostat switching valves 260 and 260, respectively, and cooling of the electric three-way valves 270 and 270 is performed.
  • the radiator 220 and the engine waste heat recovery unit 230 are installed in parallel in the water outlet (272, 273), (272, 273) (see FIG. 1) side path.
  • cooling water outlet 272, 272 communicates with the radiator 220, and the other cooling water outlet 273.
  • 273 communicate with the engine waste heat recovery unit 230.
  • the engine coolant circuit 200 further includes a plurality (two in this example) of thermostat switching valves 260 and 260 and a plurality (two in this example) of electric three-way valves 270 and 270. Yes.
  • the thermostat type switching valve 260 and the electric three-way valve 270 used here are of the same type as those conventionally used. Therefore, the sizes of the conventional thermostat type switching valve and the electric three-way valve are It is the same size.
  • the thermostat type switching valve 260 includes one cooling water inlet 261 (see FIG. 1) through which cooling water flows, and two cooling water outlets 262 and 263 (see FIG. 1) through which cooling water from the cooling water inlet 261 flows out.
  • the cooling water inlet 261 operates to flow to one of the cooling water outlets 262.
  • the cooling water inlet 261 is configured to operate so as to flow from the cooling water outlet 263 to the other cooling water outlet 263.
  • the electric three-way valve 270 has one cooling water inlet 271 (see FIG. 1) into which cooling water flows and two cooling water outlets 272, 273 (see FIG. 1) that branch out cooling water from the cooling water inlet 271 and flow out. ) And the second flow rate of the cooling water flowing from the cooling water inlet 271 to the one cooling water outlet 272 and the second flow rate of the cooling water flowing from the cooling water inlet 271 to the other cooling water outlet 273 are changed. It has a valve (not shown) and a drive unit 274 (specifically, a drive motor) that drives the operating valve.
  • the drive unit 274 is electrically connected to the output system of the control device 150 (see FIG. 1), and drives the operating valve based on an instruction signal from the control device 150 to generate a first flow rate and a second flow rate. The flow rate ratio is changed.
  • the cooling water path 240 includes a first cooling water path 241, a second cooling water path 242, a third cooling water path 243, a fourth cooling water path 244, a fifth cooling water path 245, and a sixth cooling water.
  • a path 246, a seventh cooling water path 247, an eighth cooling water path 248, and a ninth cooling water path 249 are provided.
  • the first cooling water path 241 is provided between the engine 110 and the exhaust gas heat exchanger 210.
  • the first coolant passage 241 has an upstream end communicating with the coolant outlet 111 (see FIG. 1) of the engine 110, and a downstream end connected to the coolant inlet 211 (see FIG. 1) of the exhaust gas heat exchanger 210. Communicate.
  • the second cooling water path 242 is provided between the exhaust gas heat exchanger 210 and the thermostat type switching valves 260 and 260.
  • the second cooling water path 242 has an upstream end communicating with the cooling water outlet 212 of the exhaust gas heat exchanger 210, while the downstream side branches into a plurality (two in this example), and each downstream end has a thermostat.
  • the mold switching valves 260 and 260 communicate with the cooling water inlets 261 and 261, respectively.
  • the upper branch path of the second cooling water path 242 communicates with the upper thermostat switching valve 260
  • the lower branch path of the second cooling water path 242 is the lower thermostat type.
  • the switching valve 260 is communicated.
  • the third cooling water path 243 is a plurality (two in this example) of cooling water paths, and is provided between the thermostat type switching valves 260 and 260 and the electric three-way valves 270 and 270, respectively.
  • the third cooling water paths 243 and 243 have upstream ends communicating with one of the cooling water outlets 262 and 262 of the thermostat type switching valves 260 and 260, respectively, and downstream ends of the cooling water inlets of the electric three-way valves 270 and 270. 271 and 271 respectively.
  • the upper third cooling water path 243 communicates with the upper thermostat switching valve 260 and the upper electric three-way valve 270
  • the lower third cooling water path 243 is the lower thermostat.
  • the mold switching valve 260 and the lower electric three-way valve 270 communicate with each other.
  • the fourth cooling water path 244 is provided between the thermostat type switching valves 260 and 260 and the cooling water pump 250.
  • the fourth cooling water passage 244 has a plurality of upstream branches (two in this example), and each upstream end communicates with the other cooling water outlets 263 and 263 of the thermostat switching valves 260 and 260, respectively.
  • the downstream end communicates with the water absorption part 251 of the cooling water pump 250.
  • the upper branch path of the fourth cooling water path 244 communicates with the upper thermostat switching valve 260
  • the lower branch path of the fourth cooling water path 244 is the lower thermostat type.
  • the switching valve 260 is communicated.
  • the fifth cooling water path 245 is provided between the electric three-way valves 270 and 270 and the radiator 220.
  • the fifth cooling water path 245 has a plurality of upstream branches (two in this example), and each upstream end communicates with one of the cooling water outlets 272 and 272 of the electric three-way valves 270 and 270, respectively.
  • the downstream end communicates with the cooling water inlet 221 of the radiator 220 (see FIGS. 1 and 2).
  • the upper branch path of the fifth cooling water path 245 communicates with the upper electric three-way valve 270
  • the lower branch path of the fifth cooling water path 245 is the lower electric three-way valve. 270 communicates.
  • the sixth cooling water path 246 is provided between the electric three-way valves 270 and 270 and the engine waste heat recovery unit 230.
  • the sixth cooling water path 246 has a plurality of upstream branches (two in this example), and each upstream end communicates with the other cooling water outlets 273 and 273 of the electric three-way valves 270 and 270, respectively.
  • the downstream end communicates with the cooling water inlet 231 (see FIGS. 1 and 2) of the engine waste heat recovery unit 230.
  • the upper branch path of the sixth cooling water path 246 communicates with the upper electric three-way valve 270
  • the lower branch path of the sixth cooling water path 246 is the lower electric three-way valve. 270 communicates.
  • the seventh cooling water path 247 is provided between the radiator 220 and the cooling water pump 250.
  • the seventh cooling water path 247 has an upstream end communicating with the cooling water outlet 222 (see FIGS. 1 and 2) of the radiator 220, and a downstream end communicating with the water absorption part 251 of the cooling water pump 250.
  • the eighth cooling water path 248 is provided between the engine waste heat recovery unit 230 and the cooling water pump 250.
  • the eighth cooling water path 248 has an upstream end communicating with the cooling water outlet 232 of the engine waste heat recovery unit 230, and a downstream end communicating with the water absorption part 251 of the cooling water pump 250.
  • the ninth cooling water path 249 is provided between the cooling water pump 250 and the engine 110.
  • the ninth coolant passage 249 has an upstream end communicating with the discharge portion 252 (see FIGS. 1 and 3) of the coolant pump 250, and a downstream end connected to the coolant inlet 112 (see FIG. 1) of the engine 110. Communicate.
  • the ninth cooling water passage 249 has two branches on the downstream side, and one downstream end is the cooling water inlet 112 (see FIG. 1) on the cylinder head side 110a (see FIG. 3) of the engine 110. The other downstream side end communicates with the coolant inlet 112 (see FIG. 1) on the cylinder block side 110b (see FIG. 3) of the engine 110.
  • the first cooling water passage 241 to the ninth cooling water passage 249 are of the same type as those conventionally used, and all of them (the second cooling water passage 242, the fourth cooling water passage 244, the first The fifth cooling water path 245 and the sixth cooling water path 246 (including the branch path) have the same pipe diameter.
  • an inlet 233 and an outlet 234 through which the heat medium (hot water in this example) flows in and out are provided on the heat recovery side (in this example, the hot water heater 400 side) of the engine waste heat recovery unit 230.
  • the inflow port 233 of the engine waste heat recovery unit 230 and the outflow port 401 (see FIG. 1) of the hot water heater 400 are communicated with each other via the inflow path 410 (see FIG. 1).
  • the outflow port 234 of the water heater 230 and the inflow port 402 (see FIG. 1) of the water heater 400 are communicated with each other via an outflow path 420 (see FIG. 1).
  • the cogeneration apparatus 100 further includes a water filter 280 that filters foreign matters in the cooling water.
  • the water filter 280 is inserted in a cooling water path (specifically, the first cooling water path 241) between the engine 110 and the exhaust gas heat exchanger 210.
  • the cogeneration apparatus 100 further includes an exhaust path 140 (specifically, an exhaust pipe) (see FIGS. 1 and 2) for exhausting the exhaust gas from the engine 110 to the outside via the exhaust gas heat exchanger 210. ing.
  • an exhaust path 140 specifically, an exhaust pipe
  • the exhaust path 140 is a first provided on the upstream side of the exhaust gas heat exchanger 210 (specifically, between the engine 110 and the exhaust gas heat exchanger 210) in the exhaust gas exhaust direction D (see FIG. 1).
  • An exhaust path 141 and a second exhaust path 142 provided downstream of the exhaust gas heat exchanger 210 (specifically, between the exhaust gas heat exchanger 210 and the outside) are provided.
  • the cogeneration apparatus 100 includes a three-way catalyst 130 (see FIGS. 1 and 2) that purifies exhaust gas exhausted from the engine 110, and when exhaust gas from the engine 110 is exhausted to the outside. And an exhaust silencer 185 (see FIG. 1) for reducing the exhaust noise.
  • the three-way catalyst 130 and the exhaust silencer 185 are inserted in the first exhaust path 141 and the second exhaust path 142, respectively.
  • engine coolant circuit 200 further includes a radiator fan 181 (see FIG. 1) that is driven and controlled by control device 150 to discharge the air in the exhaust chamber to the outside and radiate heat from radiator 220. Yes.
  • the exhaust gas discharged from the engine 110 is purified by the three-way catalyst 130 through the first exhaust path 141 and enters the exhaust gas heat exchanger 210.
  • the cooling water that has cooled the engine 110 and has flowed out of the cooling water outlet 111 passes through the first cooling water passage 241, the foreign matter is removed by the water filter 280, and flows into the cooling water inlet 221 of the exhaust gas heat exchanger 210. To do.
  • the cooling water flowing out from the cooling water outlet 212 of the exhaust gas heat exchanger 210 is branched into two through the second cooling water passage 242, and flows into the cooling water inlets 261 of the thermostat type switching valves 260 and 260, respectively.
  • the thermostat type switching valve 260 operates so that the cooling water flows out from the other cooling water outlets 263, 263. After flowing out from the outlets 263 and joining through the fourth cooling water passage 244, they are sucked into the water absorption part 251 of the cooling water pump 250.
  • the thermostat switching valves 260 and 260 operate so that the cooling water flows out from the one cooling water outlets 262 and 262, The water flows out from the water outlets 262 and 262, respectively, and flows into the cooling water inlets 271 and 271 of the electric three-way valves 270 and 270 through the third cooling water paths 243 and 243, respectively.
  • the drive unit 274 is driven according to the temperature of the cooling water detected by a temperature sensor (not shown) by the control device 150 and the usage state on the heat recovery side (in this example, the hot water heater 400 side).
  • the flow rate ratio by the operating valve is changed, and the first flow rate of the cooling water flowing from the cooling water inlet 271 to one cooling water outlet 272 (on the radiator 220 side) and the other cooling water outlet 273 from the cooling water inlet 271 (engine waste)
  • the second flow rate of the cooling water flowing to the heat recovery unit 230 side) is adjusted. For example, when the amount of heat exchange in the engine waste heat recovery unit 230 is small, the control device 150 increases the first flow rate (decreasing the second water amount) and increases the amount of water flowing to the radiator 220.
  • the cooling water flowing out from one of the cooling water outlets 272 and 272 of the electric three-way valves 270 and 270 merges through the fifth cooling water passage 245 and then flows into the cooling water inlet 221 of the radiator 220.
  • the radiator 220 radiates the waste heat of the cooling water flowing out from the exhaust gas heat exchanger 210 via the thermostat switching valves 260 and 260 and the electric three-way valves 270 and 270. Then, the waste heat from the radiator 220 is discharged to the outside by the radiator fan 181.
  • the cooling water flowing out from the cooling water outlet 222 of the radiator 220 is sucked into the water absorption part 251 of the cooling water pump 250 through the seventh cooling water path 247.
  • the engine waste heat recovery unit 230 recovers the waste heat of the cooling water flowing out from the exhaust gas heat exchanger 210 via the thermostat type switching valves 260 and 260 and the electric three-way valves 270 and 270. Then, the waste heat recovered by the engine waste heat recovery unit 230 is used on the heat recovery side (in this example, the water heater 400 side).
  • the cooling water that has flowed out of the cooling water outlet 232 of the engine waste heat recovery unit 230 is sucked into the water absorption part 251 of the cooling water pump 250 through the eighth cooling water path 248.
  • the cooling water discharged from the discharge part 252 of the cooling water pump 250 is branched into two through the ninth cooling water path 249, and one cooling water path is connected to the cooling water inlet 261 on the cylinder head side 110 a of the engine 110.
  • the other coolant passage flows into the coolant inlet 261 on the cylinder block side 110b.
  • the thermostat type switching valve 260, the electric three-way valve 270, and the third cooling water path 243 are two, but may be three or more.
  • the second cooling water path 242, the fourth cooling water path 244, the fifth cooling water path 245 and the sixth cooling water path 246 are branched into three or more.
  • the engine coolant circuit 200 can cool the engine 110 and the exhaust gas by circulating the coolant.
  • the radiator 220 and the engine waste heat recovery unit 230 are connected in parallel, but may be connected in series.
  • the temperature detection of the cooling water may be delayed. If it does so, the responsiveness of the abnormality determination of the engine cooling water circuit 200 will deteriorate.
  • the engine coolant circuit 200 performs the following abnormality determination control.
  • FIG. 4 is a block diagram showing a system configuration in which the control device 150 controls the abnormality determination of the engine coolant circuit 200.
  • the engine coolant circuit 200 further includes a control device 150 (an example of a control unit).
  • the control device 150 controls the engine coolant when the temperature difference between the exhaust gas upstream and downstream of the exhaust gas heat exchanger 210 in the exhaust gas exhaust direction D (see FIG. 1) from the engine 110 is equal to or less than a predetermined value Ts.
  • the circuit 200 is configured to determine whether an abnormality has occurred in the circuit 200.
  • the control device 150 includes a processing unit 151 composed of a microcomputer such as a CPU (Central Processing Unit) and a storage unit 152 including a nonvolatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM. .
  • a processing unit 151 composed of a microcomputer such as a CPU (Central Processing Unit) and a storage unit 152 including a nonvolatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM.
  • a processing unit 151 composed of a microcomputer such as a CPU (Central Processing Unit) and a storage unit 152 including a nonvolatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM.
  • ROM Read Only Memory
  • the processing unit 151 loads and executes a control program stored in advance in the ROM of the storage unit 152 on the RAM of the storage unit 152, thereby performing operation control of various components. .
  • the engine coolant circuit 200 includes an upstream temperature sensor 191 (see FIGS. 1 and 4) that detects the temperature of exhaust gas upstream of the exhaust gas heat exchanger 210, and exhaust gas downstream of the exhaust gas heat exchanger 210.
  • a downstream temperature sensor 192 (see FIGS. 1 and 4) for detecting the temperature of the gas is further provided.
  • the upstream temperature sensor 191 is electrically connected to the input system of the control device 150.
  • the upstream temperature sensor 191 detects the temperature of a pipe made of metal in the first exhaust path 141, and is provided on the outer peripheral surface of the pipe.
  • the downstream temperature sensor 192 is electrically connected to the input system of the control device 150.
  • the downstream temperature sensor 192 detects the temperature of the pipe made of metal in the second exhaust path 142, and is provided on the outer peripheral surface of the pipe.
  • the storage unit 152 stores (sets) a predetermined value Ts that serves as a reference for the temperature difference between the exhaust gas upstream and downstream of the exhaust gas heat exchanger 210.
  • the control device 150 Based on the detection signal detected by the upstream temperature sensor 191, the control device 150 detects the upstream temperature Ta of the exhaust gas (in response to the detection signal) and the downstream temperature sensor 192.
  • a second detection unit P2 that detects a downstream temperature Tb of the exhaust gas based on the detection signal detected in response to the detection signal; an upstream temperature Ta that is detected by the first detection unit P1;
  • a calculation unit P3 that calculates a difference from the downstream temperature Tb detected by the unit P2, and a determination unit P4 that determines whether the difference calculated by the calculation unit P3 is equal to or less than a predetermined value Ts stored in the storage unit 152; It is set as the structure provided with.
  • FIG. 5 is a flowchart showing an example of a control operation in which the control device 150 controls the abnormality determination of the engine coolant circuit 200.
  • control device 150 first detects the upstream temperature Ta of the exhaust gas from the detection signal from the upstream temperature sensor 191 by the first detection unit P1 (step S1), and the second detection unit. From P2, the downstream temperature Tb of the exhaust gas is detected by the detection signal from the downstream temperature sensor 192 (step S2).
  • control device 150 calculates the difference between the upstream temperature Ta detected in step S1 and the downstream temperature Tb detected in step S2 by the calculation unit P3 (step S3), and the determination unit P4 performs step S3. It is determined whether or not the difference calculated in step S is equal to or less than a predetermined value Ts (step S4).
  • step S4 determines whether or not the difference calculated in step S is equal to or less than a predetermined value Ts.
  • step S4 Yes
  • step S6 it is considered that the heat absorption by the cooling water in the exhaust gas heat exchanger 210 is not more than a predetermined amount (assuming that the cooling water cannot sufficiently exchange heat), and the engine cooling water circuit It is determined that an abnormality has occurred in 200 (step S6).
  • examples of the abnormality in the engine coolant circuit 200 include an abnormality such as a failure of the exhaust gas heat exchanger 210, a failure of the radiator fan 181 and a poor adjustment of the flow rate ratio of the electric three-way valves 270 and 270.
  • the control device 150 causes the exhaust gas temperature difference (Ta) between the upstream side and the downstream side of the exhaust gas heat exchanger 210 in the exhaust direction D of the exhaust gas from the engine 110.
  • Ta exhaust gas temperature difference
  • Tb predetermined value
  • the occurrence of abnormality in the engine coolant circuit 200 is determined. Therefore, the abnormality determination of the engine coolant circuit 200 can be performed based on the temperature of the exhaust gas. The abnormality determination of the engine coolant circuit 200 that does not depend on the temperature can be performed.
  • the cooling in the exhaust gas heat exchanger 210 is performed. It can be assumed that the heat absorption by the water is less than or equal to a predetermined amount (it can be considered that the cooling water is in a state where heat cannot be sufficiently exchanged), and therefore an abnormal occurrence of the engine cooling water circuit 200 (for example, an exhaust gas heat exchanger) 210) can be determined without depending on the temperature of the cooling water, that is, the detection of the temperature of the cooling water is not delayed, thereby improving the responsiveness of the abnormality determination of the engine cooling water circuit 200. It becomes possible to make it.
  • the present invention relates to an engine cooling water circuit that circulates cooling water to cool the engine, and is particularly applicable to an application for determining abnormality of the engine cooling water circuit that does not depend on the temperature of the cooling water.

Abstract

An engine coolant circuit that causes a coolant to circulate and cools an engine is provided with a radiator, an exhaust gas heat exchanger, an engine waste heat recovery device, and a coolant pump. The engine coolant circuit constitutes a circuit in which coolant passes from an engine through the radiator and/or the engine waste heat recovery device via the exhaust gas heat exchanger, arrives at a fluid intake section of the coolant pump, and returns to the engine. The engine coolant circuit is also provided with a control unit that determines the occurrence of an abnormality in the engine coolant circuit when the temperature difference between the exhaust gas upstream from the exhaust gas heat exchanger and exhaust gas downstream from the exhaust gas heat exchanger in the exhaust direction of the exhaust gas from the engine is equal to or less than a predetermined value.

Description

エンジン冷却水回路Engine coolant circuit
　本発明は、冷却水を循環させてエンジンを冷却するエンジン冷却水回路に関する。 The present invention relates to an engine coolant circuit that cools an engine by circulating coolant.
　冷却水を循環させてエンジンを冷却するエンジン冷却水回路として、例えば、特許文献１は、エンジンから流出した冷却水の廃熱をラジェータで放熱させた後、排気ガス熱交換器でエンジンの排気ガスと熱交換させてエンジンに戻すエンジン冷却水回路を開示している。 As an engine cooling water circuit that circulates cooling water to cool an engine, for example, Patent Document 1 discloses that exhaust heat of cooling water that has flowed out of an engine is radiated by a radiator and then exhausted from the engine by an exhaust gas heat exchanger. An engine cooling water circuit that exchanges heat with the engine and returns it to the engine is disclosed.
　通常、このようなエンジン冷却水回路では、冷却水の温度を検知し、検知した冷却水の温度に基づいてエンジン冷却水回路の異常発生の有無を検出する。 Normally, in such an engine cooling water circuit, the temperature of the cooling water is detected, and whether or not an abnormality has occurred in the engine cooling water circuit is detected based on the detected temperature of the cooling water.
特開平０９－０９６４７１号公報Japanese Patent Laid-Open No. 09-096471
　しかしながら、従来のエンジン冷却水回路では、冷却水の温度を検知するにあたって、冷却水の温度検知が遅れる可能性がある。例えば、冷却水ポンプの停止等による冷却水量の低減時に、排気ガス熱交換器で局所沸騰が発生すると、冷却水と排気ガスとの間で熱交換が進まずに気化した冷却水が高温になるが、この高温沸騰した水は下流に流れて液化して初めて水温センサで検知される。そうすると、冷却水の温度に基づくエンジン冷却水回路の異常判定の即応性が悪化する。 However, in the conventional engine coolant circuit, when detecting the coolant temperature, the coolant temperature detection may be delayed. For example, when local boiling occurs in the exhaust gas heat exchanger when the amount of cooling water is reduced by stopping the cooling water pump or the like, the cooling water vaporized without heat exchange between the cooling water and the exhaust gas becomes high temperature. However, this high-temperature boiled water is detected by the water temperature sensor only after flowing downstream and liquefying. If it does so, the responsiveness of the abnormality determination of an engine cooling water circuit based on the temperature of a cooling water will deteriorate.
　そこで、本発明は、冷却水の温度に拠らないエンジン冷却水回路の異常判定を行うことが可能な構成を提示することを目的とする。 Therefore, an object of the present invention is to present a configuration capable of performing abnormality determination of an engine coolant circuit that does not depend on the temperature of coolant.
　本発明は、前記課題を解決するために、冷却水を循環させてエンジンを冷却するエンジン冷却水回路であって、ラジエータ、排気ガス熱交換器、エンジン廃熱回収器および冷却水ポンプを設け、前記エンジンから前記排気ガス熱交換器を経由して前記ラジエータおよび／または前記エンジン廃熱回収器を通過して前記冷却水ポンプの吸水部に到って前記冷却水を前記エンジンに還流する回路を構成し、前記エンジンからの排気ガスの排気方向において前記排気ガス熱交換器の上流側および下流側における前記排気ガスの温度差が所定値以下の場合に当該エンジン冷却水回路の異常発生を判定する制御部を設けたことを特徴とするエンジン冷却水回路を提供する。 In order to solve the above problems, the present invention is an engine cooling water circuit that circulates cooling water to cool an engine, and includes a radiator, an exhaust gas heat exchanger, an engine waste heat recovery device, and a cooling water pump. A circuit for passing the cooling water from the engine to the water absorption part of the cooling water pump through the radiator and / or the engine waste heat recovery unit via the exhaust gas heat exchanger and returning the cooling water to the engine; And determining whether the engine cooling water circuit is abnormal when the temperature difference between the exhaust gas upstream and downstream of the exhaust gas heat exchanger is equal to or less than a predetermined value in the exhaust direction of the exhaust gas from the engine. Provided is an engine coolant circuit provided with a control unit.
　本発明によると、冷却水の温度に拠らないエンジン冷却水回路の異常判定を行うことが可能となる。 According to the present invention, it is possible to determine abnormality of the engine coolant circuit that does not depend on the coolant temperature.
図１は、本実施の形態に係るエンジン冷却水回路を備えたコージェネレーション装置の概略構成を示すブロック図である。FIG. 1 is a block diagram illustrating a schematic configuration of a cogeneration apparatus including an engine coolant circuit according to the present embodiment. 図２は、図１に示すコージェネレーション装置におけるエンジン冷却水回路およびその周辺部分を背面側左斜め上から視た斜視図である。FIG. 2 is a perspective view of the engine coolant circuit and its peripheral portion in the cogeneration apparatus shown in FIG. 図３は、図１に示すコージェネレーション装置におけるエンジン冷却水回路およびその周辺部分を背面側右斜め上から視た斜視図である。FIG. 3 is a perspective view of the engine coolant circuit and its peripheral portion in the cogeneration apparatus shown in FIG. 図４は、制御装置によりエンジン冷却水回路の異常判定の制御を行うシステム構成を示すブロック図である。FIG. 4 is a block diagram showing a system configuration for controlling the abnormality determination of the engine coolant circuit by the control device. 図５は、制御装置によりエンジン冷却水回路の異常判定の制御を行う制御動作の一例を示すフローチャートである。FIG. 5 is a flowchart showing an example of a control operation for controlling the abnormality determination of the engine coolant circuit by the control device.
　以下、本発明の実施の形態について添付図面を参照しつつ説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
　図１は、本実施の形態に係るエンジン冷却水回路２００を備えたコージェネレーション装置１００の概略構成を示すブロック図である。図２は、図１に示すコージェネレーション装置１００におけるエンジン冷却水回路２００およびその周辺部分を背面側Ｂ左斜め上から視た斜視図である。また、図３は、図１に示すコージェネレーション装置１００におけるエンジン冷却水回路２００およびその周辺部分を背面側Ｂ右斜め上から視た斜視図である。なお、図２および図３において、正面側はＦで示している。また、図２において排気サイレンサ１８５等は図示を省略しており、図３において排気サイレンサ１８５、ラジエータ２２０および三元触媒１３０等は図示を省略している。 FIG. 1 is a block diagram showing a schematic configuration of a cogeneration apparatus 100 including an engine coolant circuit 200 according to the present embodiment. 2 is a perspective view of the engine coolant circuit 200 and its peripheral portion in the cogeneration apparatus 100 shown in FIG. FIG. 3 is a perspective view of the engine coolant circuit 200 and its peripheral part in the cogeneration apparatus 100 shown in FIG. 2 and 3, the front side is indicated by F. Further, the exhaust silencer 185 and the like are not shown in FIG. 2, and the exhaust silencer 185, the radiator 220, the three-way catalyst 130 and the like are omitted in FIG.
　本実施の形態は、本発明の構成をコージェネレーション装置１００に採用した場合について説明する。なお、コージェネレーション装置１００とは、電力消費機器（負荷）への送電系統に、外部商用電源の商用電力系統と発電機１２０の発電電力系統とを電気的に接続し、該負荷の需要電力を賄い、かつ、発電に伴い生じる廃熱を回収し、回収した廃熱を利用するシステムである。すなわち、コージェネレーション装置１００は、エンジン１１０、発電機１２０、エンジン冷却水回路２００およびエンジン廃熱回収器２３０を備え、エンジン１１０により駆動された発電機１２０からの発電電力を出力する発電機能に加えて、エンジン冷却水回路２００により循環されてエンジン１１０の廃熱との熱交換より加熱された冷却水の廃熱をエンジン廃熱回収器２３０によって回収する機能（この例では冷却水の廃熱を回収して給湯に利用する機能）を有している。 In the present embodiment, a case where the configuration of the present invention is adopted in the cogeneration apparatus 100 will be described. The cogeneration apparatus 100 electrically connects a commercial power system of an external commercial power source and a generated power system of the generator 120 to a power transmission system to a power consuming device (load), and obtains the demand power of the load. It is a system that covers and recovers waste heat generated by power generation and uses the recovered waste heat. That is, the cogeneration apparatus 100 includes an engine 110, a generator 120, an engine coolant circuit 200, and an engine waste heat recovery unit 230, and in addition to a power generation function that outputs generated power from the generator 120 driven by the engine 110. A function of recovering the waste heat of the coolant circulated by the engine coolant circuit 200 and heated by heat exchange with the waste heat of the engine 110 by the engine waste heat recovery unit 230 (in this example, the waste heat of the coolant is It has a function to collect and use for hot water supply.
　図１から図３に示すように、エンジン冷却水回路２００は、エンジン１１０から排出される排気ガスとエンジン１１０から流出される冷却水との間で熱交換を行う排気ガス熱交換器２１０と、排気ガス熱交換器２１０から流出される冷却水の廃熱を放熱するラジエータ２２０（図３では図示省略）と、排気ガス熱交換器２１０から流出される冷却水の廃熱を回収するエンジン廃熱回収器２３０と、エンジン１１０、排気ガス熱交換器２１０、ラジエータ２２０およびエンジン廃熱回収器２３０に冷却水を流通させる冷却水経路２４０（具体的には冷却水管）と、冷却水経路２４０を介してエンジン１１０、排気ガス熱交換器２１０、ラジエータ２２０およびエンジン廃熱回収器２３０に冷却水を循環させる冷却水ポンプ２５０とを備えている。エンジン廃熱回収器２３０は、この例では、冷却水と給湯機４００（図１参照）の給湯水との間で熱交換を行う水／水熱交換器とされている。 As shown in FIGS. 1 to 3, the engine coolant circuit 200 includes an exhaust gas heat exchanger 210 that performs heat exchange between the exhaust gas discharged from the engine 110 and the coolant discharged from the engine 110. A radiator 220 (not shown in FIG. 3) that dissipates the waste heat of the cooling water flowing out of the exhaust gas heat exchanger 210, and an engine waste heat that recovers the waste heat of the cooling water flowing out of the exhaust gas heat exchanger 210. The recovery unit 230, the engine 110, the exhaust gas heat exchanger 210, the radiator 220, and the engine waste heat recovery unit 230 are passed through the cooling water path 240 (specifically, the cooling water pipe) and the cooling water path 240. And a cooling water pump 250 for circulating cooling water to the engine 110, the exhaust gas heat exchanger 210, the radiator 220, and the engine waste heat recovery unit 230. . In this example, the engine waste heat recovery unit 230 is a water / water heat exchanger that performs heat exchange between the cooling water and the hot water of the water heater 400 (see FIG. 1).
　エンジン冷却水回路２００は、エンジン１１０から排気ガス熱交換器２１０を経由してラジエータ２２０および／またはエンジン廃熱回収器２３０を通過して冷却水ポンプ２５０の吸水部２５１（図１および図２参照）に到って冷却水をエンジン１１０に還流する回路を構成している。 The engine coolant circuit 200 passes from the engine 110 via the exhaust gas heat exchanger 210 to the radiator 220 and / or the engine waste heat recovery unit 230 and passes through the water absorption part 251 of the coolant pump 250 (see FIGS. 1 and 2). ), A circuit for returning the coolant to the engine 110 is configured.
　詳しくは、エンジン冷却水回路２００には、エンジン１１０の冷却水流出口１１１（図１参照）側経路に複数（この例では２つ）のサーモスタット型切替弁２６０，２６０が並列に設けられ、冷却水の循環方向Ｃ（図１参照）における各サーモスタット型切替弁２６０，２６０の下流側に電動三方弁２７０，２７０（具体的にはモータバルブ）がそれぞれ設けられ、各電動三方弁２７０，２７０の冷却水流出口（２７２，２７３），（２７２，２７３）（図１参照）側経路にラジエータ２２０とエンジン廃熱回収器２３０とが並列に設置されている。そして、各電動三方弁２７０，２７０における２つの冷却水流出口（２７２，２７３），（２７２，２７３）のうち、一方の冷却水流出口２７２，２７２がラジエータ２２０に連通し、他方の冷却水流出口２７３，２７３がエンジン廃熱回収器２３０に連通している。 Specifically, the engine cooling water circuit 200 is provided with a plurality of (two in this example) thermostat type switching valves 260 and 260 in parallel on the cooling water outlet 111 (see FIG. 1) side path of the engine 110. In the circulation direction C (see FIG. 1), electric three-way valves 270 and 270 (specifically, motor valves) are provided downstream of the thermostat switching valves 260 and 260, respectively, and cooling of the electric three- way valves 270 and 270 is performed. The radiator 220 and the engine waste heat recovery unit 230 are installed in parallel in the water outlet (272, 273), (272, 273) (see FIG. 1) side path. Of the two cooling water outlets (272, 273), (272, 273) in each of the electric three- way valves 270, 270, one cooling water outlet 272, 272 communicates with the radiator 220, and the other cooling water outlet 273. , 273 communicate with the engine waste heat recovery unit 230.
　具体的には、エンジン冷却水回路２００は、複数（この例では２つ）のサーモスタット型切替弁２６０，２６０と、複数（この例では２つ）の電動三方弁２７０，２７０とをさらに備えている。 Specifically, the engine coolant circuit 200 further includes a plurality (two in this example) of thermostat switching valves 260 and 260 and a plurality (two in this example) of electric three- way valves 270 and 270. Yes.
　なお、ここで使用されているサーモスタット型切替弁２６０および電動三方弁２７０は、従来から使用されているものと同じタイプのものであり、従って、従来のサーモスタット型切替弁および電動三方弁のサイズと同じサイズとされている。 The thermostat type switching valve 260 and the electric three-way valve 270 used here are of the same type as those conventionally used. Therefore, the sizes of the conventional thermostat type switching valve and the electric three-way valve are It is the same size.
　サーモスタット型切替弁２６０は、冷却水を流入する１つの冷却水流入口２６１（図１参照）と、冷却水流入口２６１からの冷却水を流出する２つの冷却水流出口２６２，２６３（図１参照）とを有しており、冷却水が予め定めた所定温度より大きい場合には、冷却水流入口２６１から一方の冷却水流出口２６２に流れるように動作する一方、冷却水が前記所定温度以下の場合には、冷却水流入口２６１から他方の冷却水流出口２６３に流れるように動作する構成とされている。 The thermostat type switching valve 260 includes one cooling water inlet 261 (see FIG. 1) through which cooling water flows, and two cooling water outlets 262 and 263 (see FIG. 1) through which cooling water from the cooling water inlet 261 flows out. When the cooling water is higher than a predetermined temperature, the cooling water inlet 261 operates to flow to one of the cooling water outlets 262. On the other hand, when the cooling water is equal to or lower than the predetermined temperature, The cooling water inlet 261 is configured to operate so as to flow from the cooling water outlet 263 to the other cooling water outlet 263.
　電動三方弁２７０は、冷却水を流入する１つの冷却水流入口２７１（図１参照）と、冷却水流入口２７１からの冷却水を分流して流出する２つの冷却水流出口２７２，２７３（図１参照）と、冷却水流入口２７１から一方の冷却水流出口２７２に流れる冷却水の第１流量と冷却水流入口２７１から他方の冷却水流出口２７３に流れる冷却水の第２流量との流量比率を変更する作動弁（図示せず）と、作動弁を駆動する駆動部２７４（具体的には駆動モータ）とを有している。駆動部２７４は、制御装置１５０（図１参照）の出力系に電気的に接続されており、制御装置１５０からの指示信号に基づいて作動弁を駆動して第１流量と第２流量との流量比率を変更する構成とされている。 The electric three-way valve 270 has one cooling water inlet 271 (see FIG. 1) into which cooling water flows and two cooling water outlets 272, 273 (see FIG. 1) that branch out cooling water from the cooling water inlet 271 and flow out. ) And the second flow rate of the cooling water flowing from the cooling water inlet 271 to the one cooling water outlet 272 and the second flow rate of the cooling water flowing from the cooling water inlet 271 to the other cooling water outlet 273 are changed. It has a valve (not shown) and a drive unit 274 (specifically, a drive motor) that drives the operating valve. The drive unit 274 is electrically connected to the output system of the control device 150 (see FIG. 1), and drives the operating valve based on an instruction signal from the control device 150 to generate a first flow rate and a second flow rate. The flow rate ratio is changed.
　冷却水経路２４０は、第１冷却水経路２４１と、第２冷却水経路２４２と、第３冷却水経路２４３と、第４冷却水経路２４４と、第５冷却水経路２４５と、第６冷却水経路２４６と、第７冷却水経路２４７と、第８冷却水経路２４８と、第９冷却水経路２４９とを備えている。 The cooling water path 240 includes a first cooling water path 241, a second cooling water path 242, a third cooling water path 243, a fourth cooling water path 244, a fifth cooling water path 245, and a sixth cooling water. A path 246, a seventh cooling water path 247, an eighth cooling water path 248, and a ninth cooling water path 249 are provided.
　第１冷却水経路２４１は、エンジン１１０と排気ガス熱交換器２１０との間に設けられている。第１冷却水経路２４１は、上流側端がエンジン１１０の冷却水流出口１１１（図１参照）に連通する一方、下流側端が排気ガス熱交換器２１０の冷却水流入口２１１（図１参照）に連通している。 The first cooling water path 241 is provided between the engine 110 and the exhaust gas heat exchanger 210. The first coolant passage 241 has an upstream end communicating with the coolant outlet 111 (see FIG. 1) of the engine 110, and a downstream end connected to the coolant inlet 211 (see FIG. 1) of the exhaust gas heat exchanger 210. Communicate.
　第２冷却水経路２４２は、排気ガス熱交換器２１０とサーモスタット型切替弁２６０，２６０との間に設けられている。第２冷却水経路２４２は、上流側端が排気ガス熱交換器２１０の冷却水流出口２１２に連通する一方、下流側が複数（この例では２つ）に分岐しており、各下流側端がサーモスタット型切替弁２６０，２６０の冷却水流入口２６１，２６１にそれぞれ連通している。図１に示す例では、第２冷却水経路２４２の上側の分岐経路は、上側のサーモスタット型切替弁２６０に連通し、第２冷却水経路２４２の下側の分岐経路は、下側のサーモスタット型切替弁２６０に連通している。 The second cooling water path 242 is provided between the exhaust gas heat exchanger 210 and the thermostat type switching valves 260 and 260. The second cooling water path 242 has an upstream end communicating with the cooling water outlet 212 of the exhaust gas heat exchanger 210, while the downstream side branches into a plurality (two in this example), and each downstream end has a thermostat. The mold switching valves 260 and 260 communicate with the cooling water inlets 261 and 261, respectively. In the example shown in FIG. 1, the upper branch path of the second cooling water path 242 communicates with the upper thermostat switching valve 260, and the lower branch path of the second cooling water path 242 is the lower thermostat type. The switching valve 260 is communicated.
　第３冷却水経路２４３は、複数（この例では２つ）の冷却水経路とされており、サーモスタット型切替弁２６０，２６０と電動三方弁２７０，２７０との間にそれぞれ設けられている。第３冷却水経路２４３，２４３は、上流側端がサーモスタット型切替弁２６０，２６０の一方の冷却水流出口２６２，２６２にそれぞれ連通する一方、下流側端が電動三方弁２７０，２７０の冷却水流入口２７１，２７１にそれぞれ連通している。図１に示す例では、上側の第３冷却水経路２４３は、上側のサーモスタット型切替弁２６０および上側の電動三方弁２７０に連通し、下側の第３冷却水経路２４３は、下側のサーモスタット型切替弁２６０および下側の電動三方弁２７０に連通している。 The third cooling water path 243 is a plurality (two in this example) of cooling water paths, and is provided between the thermostat type switching valves 260 and 260 and the electric three- way valves 270 and 270, respectively. The third cooling water paths 243 and 243 have upstream ends communicating with one of the cooling water outlets 262 and 262 of the thermostat type switching valves 260 and 260, respectively, and downstream ends of the cooling water inlets of the electric three- way valves 270 and 270. 271 and 271 respectively. In the example shown in FIG. 1, the upper third cooling water path 243 communicates with the upper thermostat switching valve 260 and the upper electric three-way valve 270, and the lower third cooling water path 243 is the lower thermostat. The mold switching valve 260 and the lower electric three-way valve 270 communicate with each other.
　第４冷却水経路２４４は、サーモスタット型切替弁２６０，２６０と冷却水ポンプ２５０との間に設けられている。第４冷却水経路２４４は、上流側が複数（この例では２つ）に分岐しており、各上流側端がサーモスタット型切替弁２６０，２６０の他方の冷却水流出口２６３，２６３にそれぞれ連通する一方、下流側端が冷却水ポンプ２５０の吸水部２５１に連通している。図１に示す例では、第４冷却水経路２４４の上側の分岐経路は、上側のサーモスタット型切替弁２６０に連通し、第４冷却水経路２４４の下側の分岐経路は、下側のサーモスタット型切替弁２６０に連通している。 The fourth cooling water path 244 is provided between the thermostat type switching valves 260 and 260 and the cooling water pump 250. The fourth cooling water passage 244 has a plurality of upstream branches (two in this example), and each upstream end communicates with the other cooling water outlets 263 and 263 of the thermostat switching valves 260 and 260, respectively. The downstream end communicates with the water absorption part 251 of the cooling water pump 250. In the example shown in FIG. 1, the upper branch path of the fourth cooling water path 244 communicates with the upper thermostat switching valve 260, and the lower branch path of the fourth cooling water path 244 is the lower thermostat type. The switching valve 260 is communicated.
　第５冷却水経路２４５は、電動三方弁２７０，２７０とラジエータ２２０との間に設けられている。第５冷却水経路２４５は、上流側が複数（この例では２つ）に分岐しており、各上流側端が電動三方弁２７０，２７０の一方の冷却水流出口２７２，２７２にそれぞれ連通する一方、下流側端がラジエータ２２０の冷却水流入口２２１（図１および図２参照）に連通している。図１に示す例では、第５冷却水経路２４５の上側の分岐経路は、上側の電動三方弁２７０に連通し、第５冷却水経路２４５の下側の分岐経路は、下側の電動三方弁２７０に連通している。 The fifth cooling water path 245 is provided between the electric three- way valves 270 and 270 and the radiator 220. The fifth cooling water path 245 has a plurality of upstream branches (two in this example), and each upstream end communicates with one of the cooling water outlets 272 and 272 of the electric three- way valves 270 and 270, respectively. The downstream end communicates with the cooling water inlet 221 of the radiator 220 (see FIGS. 1 and 2). In the example shown in FIG. 1, the upper branch path of the fifth cooling water path 245 communicates with the upper electric three-way valve 270, and the lower branch path of the fifth cooling water path 245 is the lower electric three-way valve. 270 communicates.
　第６冷却水経路２４６は、電動三方弁２７０，２７０とエンジン廃熱回収器２３０との間に設けられている。第６冷却水経路２４６は、上流側が複数（この例では２つ）に分岐しており、各上流側端が電動三方弁２７０，２７０の他方の冷却水流出口２７３，２７３にそれぞれ連通する一方、下流側端がエンジン廃熱回収器２３０の冷却水流入口２３１（図１および図２参照）に連通している。図１に示す例では、第６冷却水経路２４６の上側の分岐経路は、上側の電動三方弁２７０に連通し、第６冷却水経路２４６の下側の分岐経路は、下側の電動三方弁２７０に連通している。 The sixth cooling water path 246 is provided between the electric three- way valves 270 and 270 and the engine waste heat recovery unit 230. The sixth cooling water path 246 has a plurality of upstream branches (two in this example), and each upstream end communicates with the other cooling water outlets 273 and 273 of the electric three- way valves 270 and 270, respectively. The downstream end communicates with the cooling water inlet 231 (see FIGS. 1 and 2) of the engine waste heat recovery unit 230. In the example shown in FIG. 1, the upper branch path of the sixth cooling water path 246 communicates with the upper electric three-way valve 270, and the lower branch path of the sixth cooling water path 246 is the lower electric three-way valve. 270 communicates.
　第７冷却水経路２４７は、ラジエータ２２０と冷却水ポンプ２５０との間に設けられている。第７冷却水経路２４７は、上流側端がラジエータ２２０の冷却水流出口２２２（図１および図２参照）に連通する一方、下流側端が冷却水ポンプ２５０の吸水部２５１に連通している。 The seventh cooling water path 247 is provided between the radiator 220 and the cooling water pump 250. The seventh cooling water path 247 has an upstream end communicating with the cooling water outlet 222 (see FIGS. 1 and 2) of the radiator 220, and a downstream end communicating with the water absorption part 251 of the cooling water pump 250.
　第８冷却水経路２４８は、エンジン廃熱回収器２３０と冷却水ポンプ２５０との間に設けられている。第８冷却水経路２４８は、上流側端がエンジン廃熱回収器２３０の冷却水流出口２３２に連通する一方、下流側端が冷却水ポンプ２５０の吸水部２５１に連通している。 The eighth cooling water path 248 is provided between the engine waste heat recovery unit 230 and the cooling water pump 250. The eighth cooling water path 248 has an upstream end communicating with the cooling water outlet 232 of the engine waste heat recovery unit 230, and a downstream end communicating with the water absorption part 251 of the cooling water pump 250.
　第９冷却水経路２４９は、冷却水ポンプ２５０とエンジン１１０との間に設けられている。第９冷却水経路２４９は、上流側端が冷却水ポンプ２５０の吐出部２５２（図１および図３参照）に連通する一方、下流側端がエンジン１１０の冷却水流入口１１２（図１参照）に連通している。この例では、第９冷却水経路２４９は、下流側が２つに分岐しており、一方の下流側端がエンジン１１０のシリンダヘッド側１１０ａ（図３参照）の冷却水流入口１１２（図１参照）に連通する一方、他方の下流側端がエンジン１１０のシリンダブロック側１１０ｂ（図３参照）の冷却水流入口１１２（図１参照）に連通している。 The ninth cooling water path 249 is provided between the cooling water pump 250 and the engine 110. The ninth coolant passage 249 has an upstream end communicating with the discharge portion 252 (see FIGS. 1 and 3) of the coolant pump 250, and a downstream end connected to the coolant inlet 112 (see FIG. 1) of the engine 110. Communicate. In this example, the ninth cooling water passage 249 has two branches on the downstream side, and one downstream end is the cooling water inlet 112 (see FIG. 1) on the cylinder head side 110a (see FIG. 3) of the engine 110. The other downstream side end communicates with the coolant inlet 112 (see FIG. 1) on the cylinder block side 110b (see FIG. 3) of the engine 110.
　なお、第１冷却水経路２４１から第９冷却水経路２４９は、従来から使用されているものと同じタイプのものであり、何れも（第２冷却水経路２４２、第４冷却水経路２４４、第５冷却水経路２４５および第６冷却水経路２４６は分岐経路も含めて）同じ管径とされている。 The first cooling water passage 241 to the ninth cooling water passage 249 are of the same type as those conventionally used, and all of them (the second cooling water passage 242, the fourth cooling water passage 244, the first The fifth cooling water path 245 and the sixth cooling water path 246 (including the branch path) have the same pipe diameter.
　また、エンジン廃熱回収器２３０の熱回収側（この例では給湯機４００側）には、熱媒体（この例では給湯水）がそれぞれ流入および流出する流入口２３３および流出口２３４が設けられている。具体的には、エンジン廃熱回収器２３０の流入口２３３と給湯機４００の流出口４０１（図１参照）とが流入経路４１０（図１参照）を介して連通されており、エンジン廃熱回収器２３０の流出口２３４と給湯機４００の流入口４０２（図１参照）とが流出経路４２０（図１参照）を介して連通されている。 Further, an inlet 233 and an outlet 234 through which the heat medium (hot water in this example) flows in and out are provided on the heat recovery side (in this example, the hot water heater 400 side) of the engine waste heat recovery unit 230. Yes. Specifically, the inflow port 233 of the engine waste heat recovery unit 230 and the outflow port 401 (see FIG. 1) of the hot water heater 400 are communicated with each other via the inflow path 410 (see FIG. 1). The outflow port 234 of the water heater 230 and the inflow port 402 (see FIG. 1) of the water heater 400 are communicated with each other via an outflow path 420 (see FIG. 1).
　本実施の形態では、コージェネレーション装置１００は、冷却水における異物を濾過する水フィルタ２８０をさらに備えている。 In the present embodiment, the cogeneration apparatus 100 further includes a water filter 280 that filters foreign matters in the cooling water.
　水フィルタ２８０は、エンジン１１０と排気ガス熱交換器２１０との間の冷却水経路（具体的には、第１冷却水経路２４１）に介挿されている。 The water filter 280 is inserted in a cooling water path (specifically, the first cooling water path 241) between the engine 110 and the exhaust gas heat exchanger 210.
　また、コージェネレーション装置１００は、排気ガス熱交換器２１０を介してエンジン１１０からの排気ガスを外部に排出する排気経路１４０（具体的には排気管）（図１および図２参照）をさらに備えている。 The cogeneration apparatus 100 further includes an exhaust path 140 (specifically, an exhaust pipe) (see FIGS. 1 and 2) for exhausting the exhaust gas from the engine 110 to the outside via the exhaust gas heat exchanger 210. ing.
　排気経路１４０は、排気ガスの排気方向Ｄ（図１参照）における排気ガス熱交換器２１０の上流側（具体的にはエンジン１１０と排気ガス熱交換器２１０との間）に設けられた第１排気経路１４１と、排気ガス熱交換器２１０の下流側（具体的には排気ガス熱交換器２１０と外部との間）に設けられた第２排気経路１４２とを備えている。 The exhaust path 140 is a first provided on the upstream side of the exhaust gas heat exchanger 210 (specifically, between the engine 110 and the exhaust gas heat exchanger 210) in the exhaust gas exhaust direction D (see FIG. 1). An exhaust path 141 and a second exhaust path 142 provided downstream of the exhaust gas heat exchanger 210 (specifically, between the exhaust gas heat exchanger 210 and the outside) are provided.
　本実施の形態では、コージェネレーション装置１００は、エンジン１１０から排出される排気ガスを浄化する三元触媒１３０（図１および図２参照）と、エンジン１１０からの排気ガスが外部へ排出される際の排気音を低減する排気サイレンサ１８５（図１参照）とをさらに備えている。 In the present embodiment, the cogeneration apparatus 100 includes a three-way catalyst 130 (see FIGS. 1 and 2) that purifies exhaust gas exhausted from the engine 110, and when exhaust gas from the engine 110 is exhausted to the outside. And an exhaust silencer 185 (see FIG. 1) for reducing the exhaust noise.
　三元触媒１３０および排気サイレンサ１８５は、それぞれ、第１排気経路１４１および第２排気経路１４２に介挿されている。 The three-way catalyst 130 and the exhaust silencer 185 are inserted in the first exhaust path 141 and the second exhaust path 142, respectively.
　本実施の形態では、エンジン冷却水回路２００は、制御装置１５０により駆動制御されることにより排気室内の空気を外部に排出してラジエータ２２０を放熱するラジエータファン１８１（図１参照）をさらに備えている。 In the present embodiment, engine coolant circuit 200 further includes a radiator fan 181 (see FIG. 1) that is driven and controlled by control device 150 to discharge the air in the exhaust chamber to the outside and radiate heat from radiator 220. Yes.
　以上説明したエンジン冷却水回路２００では、エンジン１１０から排出された排気ガスは、第１排気経路１４１を通って三元触媒１３０で浄化されて排気ガス熱交換器２１０に入る。一方、エンジン１１０を冷却して冷却水流出口１１１から流出した冷却水は、第１冷却水経路２４１を通って水フィルタ２８０で異物が除去されて排気ガス熱交換器２１０の冷却水流入口２２１に流入する。 In the engine coolant circuit 200 described above, the exhaust gas discharged from the engine 110 is purified by the three-way catalyst 130 through the first exhaust path 141 and enters the exhaust gas heat exchanger 210. On the other hand, the cooling water that has cooled the engine 110 and has flowed out of the cooling water outlet 111 passes through the first cooling water passage 241, the foreign matter is removed by the water filter 280, and flows into the cooling water inlet 221 of the exhaust gas heat exchanger 210. To do.
　排気ガス熱交換器２１０では、三元触媒１３０から排出された排気ガスと水フィルタ２８０から流出された冷却水との間で熱交換を行う。 In the exhaust gas heat exchanger 210, heat is exchanged between the exhaust gas discharged from the three-way catalyst 130 and the cooling water discharged from the water filter 280.
　排気ガス熱交換器２１０の冷却水流出口２１２から流出した冷却水は、第２冷却水経路２４２を通って２つに分岐され、サーモスタット型切替弁２６０，２６０の冷却水流入口２６１にそれぞれ流入する。このとき、冷却水の温度が所定温度以下の場合には、サーモスタット型切替弁２６０は、他方の冷却水流出口２６３，２６３から冷却水を流出させるように作動し、冷却水は、他方の冷却水流出口２６３からそれぞれ流出し、第４冷却水経路２４４を通って合流した後、冷却水ポンプ２５０の吸水部２５１に吸入される。一方、冷却水の温度が所定温度より大きい場合には、サーモスタット型切替弁２６０，２６０は、一方の冷却水流出口２６２，２６２から冷却水を流出させるように動作し、冷却水は、一方の冷却水流出口２６２，２６２からそれぞれ流出し、第３冷却水経路２４３，２４３を通って電動三方弁２７０，２７０の冷却水流入口２７１，２７１にそれぞれ流入する。 The cooling water flowing out from the cooling water outlet 212 of the exhaust gas heat exchanger 210 is branched into two through the second cooling water passage 242, and flows into the cooling water inlets 261 of the thermostat type switching valves 260 and 260, respectively. At this time, when the temperature of the cooling water is equal to or lower than the predetermined temperature, the thermostat type switching valve 260 operates so that the cooling water flows out from the other cooling water outlets 263, 263. After flowing out from the outlets 263 and joining through the fourth cooling water passage 244, they are sucked into the water absorption part 251 of the cooling water pump 250. On the other hand, when the temperature of the cooling water is higher than the predetermined temperature, the thermostat switching valves 260 and 260 operate so that the cooling water flows out from the one cooling water outlets 262 and 262, The water flows out from the water outlets 262 and 262, respectively, and flows into the cooling water inlets 271 and 271 of the electric three- way valves 270 and 270 through the third cooling water paths 243 and 243, respectively.
　電動三方弁２７０，２７０では、制御装置１５０により図示を省略した温度センサにて検知した冷却水の温度や熱回収側（この例では給湯機４００側）の使用状況に応じて駆動部２７４が駆動されて作動弁による流量比率が変更され、冷却水流入口２７１から一方の冷却水流出口２７２（ラジエータ２２０側）に流れる冷却水の第１流量と冷却水流入口２７１から他方の冷却水流出口２７３（エンジン廃熱回収器２３０側）に流れる冷却水の第２流量とが調整される。例えば、制御装置１５０は、エンジン廃熱回収器２３０での熱交換量が少ない場合には、第１流量を増やして（第２水量を減らして）ラジエータ２２０へ流れる水量を多くする。 In the electric three- way valves 270, 270, the drive unit 274 is driven according to the temperature of the cooling water detected by a temperature sensor (not shown) by the control device 150 and the usage state on the heat recovery side (in this example, the hot water heater 400 side). Thus, the flow rate ratio by the operating valve is changed, and the first flow rate of the cooling water flowing from the cooling water inlet 271 to one cooling water outlet 272 (on the radiator 220 side) and the other cooling water outlet 273 from the cooling water inlet 271 (engine waste) The second flow rate of the cooling water flowing to the heat recovery unit 230 side) is adjusted. For example, when the amount of heat exchange in the engine waste heat recovery unit 230 is small, the control device 150 increases the first flow rate (decreasing the second water amount) and increases the amount of water flowing to the radiator 220.
　電動三方弁２７０，２７０の一方の冷却水流出口２７２，２７２からそれぞれ流出した冷却水は、第５冷却水経路２４５を通って合流した後、ラジエータ２２０の冷却水流入口２２１に流入する。ラジエータ２２０では、排気ガス熱交換器２１０からサーモスタット型切替弁２６０，２６０および電動三方弁２７０，２７０を経由して流出される冷却水の廃熱を放熱する。そして、ラジエータ２２０からの廃熱をラジエータファン１８１により外部に排出する。ラジエータ２２０の冷却水流出口２２２から流出した冷却水は、第７冷却水経路２４７を通って冷却水ポンプ２５０の吸水部２５１に吸入される。 The cooling water flowing out from one of the cooling water outlets 272 and 272 of the electric three- way valves 270 and 270 merges through the fifth cooling water passage 245 and then flows into the cooling water inlet 221 of the radiator 220. The radiator 220 radiates the waste heat of the cooling water flowing out from the exhaust gas heat exchanger 210 via the thermostat switching valves 260 and 260 and the electric three- way valves 270 and 270. Then, the waste heat from the radiator 220 is discharged to the outside by the radiator fan 181. The cooling water flowing out from the cooling water outlet 222 of the radiator 220 is sucked into the water absorption part 251 of the cooling water pump 250 through the seventh cooling water path 247.
　電動三方弁２７０，２７０の他方の冷却水流出口２７３，２７３からそれぞれ流出した冷却水は、第６冷却水経路２４６を通って合流した後、エンジン廃熱回収器２３０の冷却水流入口２３１に流入する。エンジン廃熱回収器２３０では、排気ガス熱交換器２１０からサーモスタット型切替弁２６０，２６０および電動三方弁２７０，２７０を経由して流出される冷却水の廃熱を回収する。そして、エンジン廃熱回収器２３０で回収した廃熱を熱回収側（この例では給湯機４００側）で利用する。エンジン廃熱回収器２３０の冷却水流出口２３２から流出した冷却水は、第８冷却水経路２４８を通って冷却水ポンプ２５０の吸水部２５１に吸入される。 The cooling water flowing out from the other cooling water outlets 273 and 273 of the electric three- way valves 270 and 270 merges through the sixth cooling water passage 246 and then flows into the cooling water inlet 231 of the engine waste heat recovery unit 230. . The engine waste heat recovery unit 230 recovers the waste heat of the cooling water flowing out from the exhaust gas heat exchanger 210 via the thermostat type switching valves 260 and 260 and the electric three- way valves 270 and 270. Then, the waste heat recovered by the engine waste heat recovery unit 230 is used on the heat recovery side (in this example, the water heater 400 side). The cooling water that has flowed out of the cooling water outlet 232 of the engine waste heat recovery unit 230 is sucked into the water absorption part 251 of the cooling water pump 250 through the eighth cooling water path 248.
　冷却水ポンプ２５０の吐出部２５２から吐出した冷却水は、第９冷却水経路２４９を通って２つに分岐され、一方の冷却水経路は、エンジン１１０のシリンダヘッド側１１０ａの冷却水流入口２６１に流入する一方、他方の冷却水経路は、シリンダブロック側１１０ｂの冷却水流入口２６１に流入する。 The cooling water discharged from the discharge part 252 of the cooling water pump 250 is branched into two through the ninth cooling water path 249, and one cooling water path is connected to the cooling water inlet 261 on the cylinder head side 110 a of the engine 110. On the other hand, the other coolant passage flows into the coolant inlet 261 on the cylinder block side 110b.
　なお、この例では、サーモスタット型切替弁２６０、電動三方弁２７０および第３冷却水経路２４３を２つとしたが、３つ以上としてもよい。この場合、第２冷却水経路２４２、第４冷却水経路２４４、第５冷却水経路２４５および第６冷却水経路２４６は、３つ以上に分岐される。 In this example, the thermostat type switching valve 260, the electric three-way valve 270, and the third cooling water path 243 are two, but may be three or more. In this case, the second cooling water path 242, the fourth cooling water path 244, the fifth cooling water path 245 and the sixth cooling water path 246 are branched into three or more.
　こうして、エンジン冷却水回路２００では、冷却水を循環させてエンジン１１０および排気ガスを冷却することができる。 Thus, the engine coolant circuit 200 can cool the engine 110 and the exhaust gas by circulating the coolant.
　なお、図１から図３に示すエンジン冷却水回路２００では、ラジエータ２２０およびエンジン廃熱回収器２３０を並列に接続するように構成したが、直列に接続するように構成してもよい。 In the engine cooling water circuit 200 shown in FIGS. 1 to 3, the radiator 220 and the engine waste heat recovery unit 230 are connected in parallel, but may be connected in series.
　ところで、冷却水の温度を検知し、検知した冷却水の温度に基づいて（例えば冷却水の温度が所定温度以上か否かにより）エンジン冷却水回路２００の異常発生の有無を検出することが考えられるが、この場合、冷却水の温度検知が遅れる可能性がある。そうすると、エンジン冷却水回路２００の異常判定の即応性が悪化する。 By the way, it is considered to detect the temperature of the cooling water and detect whether or not an abnormality has occurred in the engine cooling water circuit 200 based on the detected temperature of the cooling water (for example, whether the temperature of the cooling water is equal to or higher than a predetermined temperature). In this case, however, the temperature detection of the cooling water may be delayed. If it does so, the responsiveness of the abnormality determination of the engine cooling water circuit 200 will deteriorate.
　この点、本実施の形態に係るエンジン冷却水回路２００では、次のような異常判定の制御を行う。 In this respect, the engine coolant circuit 200 according to the present embodiment performs the following abnormality determination control.
　図４は、制御装置１５０によりエンジン冷却水回路２００の異常判定の制御を行うシステム構成を示すブロック図である。 FIG. 4 is a block diagram showing a system configuration in which the control device 150 controls the abnormality determination of the engine coolant circuit 200.
　エンジン冷却水回路２００は、制御装置１５０（制御部の一例）をさらに備えている。 The engine coolant circuit 200 further includes a control device 150 (an example of a control unit).
　制御装置１５０は、エンジン１１０からの排気ガスの排気方向Ｄ（図１参照）において排気ガス熱交換器２１０の上流側および下流側における排気ガスの温度差が所定値Ｔｓ以下の場合にエンジン冷却水回路２００の異常発生を判定する構成とされている。 The control device 150 controls the engine coolant when the temperature difference between the exhaust gas upstream and downstream of the exhaust gas heat exchanger 210 in the exhaust gas exhaust direction D (see FIG. 1) from the engine 110 is equal to or less than a predetermined value Ts. The circuit 200 is configured to determine whether an abnormality has occurred in the circuit 200.
　制御装置１５０は、ＣＰＵ（Central Processing Unit）等のマイクロコンピュータからなる処理部１５１と、ＲＯＭ（Read Only Memory）等の不揮発性メモリ、ＲＡＭ等の揮発性メモリを含む記憶部１５２とを備えている。 The control device 150 includes a processing unit 151 composed of a microcomputer such as a CPU (Central Processing Unit) and a storage unit 152 including a nonvolatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM. .
　制御装置１５０は、処理部１５１が記憶部１５２のＲＯＭに予め格納された制御プログラムを記憶部１５２のＲＡＭ上にロードして実行することにより、各種構成要素の作動制御を行うようになっている。 In the control device 150, the processing unit 151 loads and executes a control program stored in advance in the ROM of the storage unit 152 on the RAM of the storage unit 152, thereby performing operation control of various components. .
　エンジン冷却水回路２００は、排気ガス熱交換器２１０の上流側における排気ガスの温度を検知する上流側温度センサ１９１（図１及び図４参照）と、排気ガス熱交換器２１０の下流側における排気ガスの温度を検知する下流側温度センサ１９２（図１及び図４参照）とをさらに備えている。 The engine coolant circuit 200 includes an upstream temperature sensor 191 (see FIGS. 1 and 4) that detects the temperature of exhaust gas upstream of the exhaust gas heat exchanger 210, and exhaust gas downstream of the exhaust gas heat exchanger 210. A downstream temperature sensor 192 (see FIGS. 1 and 4) for detecting the temperature of the gas is further provided.
　上流側温度センサ１９１は、制御装置１５０の入力系に電気的に接続されている。上流側温度センサ１９１は、この例では、第１排気経路１４１の金属からなる配管の温度を検知するものであり、該配管の外周面に設けられている。下流側温度センサ１９２は、制御装置１５０の入力系に電気的に接続されている。下流側温度センサ１９２は、この例では、第２排気経路１４２の金属からなる配管の温度を検知するものであり、該配管の外周面に設けられている。 The upstream temperature sensor 191 is electrically connected to the input system of the control device 150. In this example, the upstream temperature sensor 191 detects the temperature of a pipe made of metal in the first exhaust path 141, and is provided on the outer peripheral surface of the pipe. The downstream temperature sensor 192 is electrically connected to the input system of the control device 150. In this example, the downstream temperature sensor 192 detects the temperature of the pipe made of metal in the second exhaust path 142, and is provided on the outer peripheral surface of the pipe.
　記憶部１５２には、排気ガス熱交換器２１０の上流側および下流側における排気ガスの温度差の基準となる所定値Ｔｓが予め記憶（設定）されている。 The storage unit 152 stores (sets) a predetermined value Ts that serves as a reference for the temperature difference between the exhaust gas upstream and downstream of the exhaust gas heat exchanger 210.
　制御装置１５０は、上流側温度センサ１９１にて検知した検知信号に基づいて（該検知信号に応じた）排気ガスの上流側温度Ｔａを検出する第１検出部Ｐ１と、下流側温度センサ１９２にて検知した検知信号に基づいて（該検知信号に応じた）排気ガスの下流側温度Ｔｂを検出する第２検出部Ｐ２と、第１検出部Ｐ１にて検出した上流側温度Ｔａと第２検出部Ｐ２にて検出した下流側温度Ｔｂとの差分を算出する算出部Ｐ３と、算出部Ｐ３にて算出した差分が記憶部１５２に記憶した所定値Ｔｓ以下か否かを判定する判定部Ｐ４とを備える構成とされている。 Based on the detection signal detected by the upstream temperature sensor 191, the control device 150 detects the upstream temperature Ta of the exhaust gas (in response to the detection signal) and the downstream temperature sensor 192. A second detection unit P2 that detects a downstream temperature Tb of the exhaust gas based on the detection signal detected in response to the detection signal; an upstream temperature Ta that is detected by the first detection unit P1; A calculation unit P3 that calculates a difference from the downstream temperature Tb detected by the unit P2, and a determination unit P4 that determines whether the difference calculated by the calculation unit P3 is equal to or less than a predetermined value Ts stored in the storage unit 152; It is set as the structure provided with.
　図５は、制御装置１５０によりエンジン冷却水回路２００の異常判定の制御を行う制御動作の一例を示すフローチャートである。 FIG. 5 is a flowchart showing an example of a control operation in which the control device 150 controls the abnormality determination of the engine coolant circuit 200.
　図５に示すフローチャートでは、制御装置１５０は、先ず、第１検出部Ｐ１により、上流側温度センサ１９１からの検知信号により排気ガスの上流側温度Ｔａを検出し（ステップＳ１）、第２検出部Ｐ２により、下流側温度センサ１９２からの検知信号により排気ガスの下流側温度Ｔｂを検出する（ステップＳ２）。 In the flowchart shown in FIG. 5, the control device 150 first detects the upstream temperature Ta of the exhaust gas from the detection signal from the upstream temperature sensor 191 by the first detection unit P1 (step S1), and the second detection unit. From P2, the downstream temperature Tb of the exhaust gas is detected by the detection signal from the downstream temperature sensor 192 (step S2).
　次に、制御装置１５０は、算出部Ｐ３により、ステップＳ１で検出した上流側温度ＴａとステップＳ２で検出した下流側温度Ｔｂとの差分を算出し（ステップＳ３）、判定部Ｐ４により、ステップＳ３で算出した差分が所定値Ｔｓ以下であるか否かを判断する（ステップＳ４）。ステップＳ３で算出した差分が所定値より大きい場合には（ステップＳ４：Ｎｏ）、エンジン冷却水回路２００が正常であると判定し（ステップＳ５）、ステップＳ３で算出した差分が所定値Ｔｓ以下の場合には（ステップＳ４：Ｙｅｓ）、排気ガス熱交換器２１０での冷却水による吸熱が所定量以下であるとみなして（冷却水が十分に熱交換できない状態とみなして）、エンジン冷却水回路２００に異常が発生していると判定する（ステップＳ６）。 Next, the control device 150 calculates the difference between the upstream temperature Ta detected in step S1 and the downstream temperature Tb detected in step S2 by the calculation unit P3 (step S3), and the determination unit P4 performs step S3. It is determined whether or not the difference calculated in step S is equal to or less than a predetermined value Ts (step S4). When the difference calculated in step S3 is larger than the predetermined value (step S4: No), it is determined that the engine coolant circuit 200 is normal (step S5), and the difference calculated in step S3 is equal to or smaller than the predetermined value Ts. In such a case (step S4: Yes), it is considered that the heat absorption by the cooling water in the exhaust gas heat exchanger 210 is not more than a predetermined amount (assuming that the cooling water cannot sufficiently exchange heat), and the engine cooling water circuit It is determined that an abnormality has occurred in 200 (step S6).
　ここで、エンジン冷却水回路２００の異常としては、排気ガス熱交換器２１０の不具合やラジエータファン１８１の不具合、電動三方弁２７０，２７０の流量比率の調整不良といった異常を例示できる。 Here, examples of the abnormality in the engine coolant circuit 200 include an abnormality such as a failure of the exhaust gas heat exchanger 210, a failure of the radiator fan 181 and a poor adjustment of the flow rate ratio of the electric three- way valves 270 and 270.
　以上説明したように、本実施の形態によれば、制御装置１５０により、エンジン１１０からの排気ガスの排気方向Ｄにおいて排気ガス熱交換器２１０の上流側および下流側における排気ガスの温度差（Ｔａ－Ｔｂ）が所定値Ｔｓ以下の場合にエンジン冷却水回路２００の異常発生を判定するので、排気ガスの温度に拠ってエンジン冷却水回路２００の異常判定を行うことができ、従って、冷却水の温度に拠らないエンジン冷却水回路２００の異常判定を行うことができる。詳しくは、排気ガス熱交換器２１０の上流側および下流側における排気ガスの温度差（Ｔａ－Ｔｂ）が所定値Ｔｓ以下であることを検知した場合には、排気ガス熱交換器２１０での冷却水による吸熱が所定量以下であるとみなすことができ（冷却水が十分に熱交換できない状態であるとみなすことができ）、従って、エンジン冷却水回路２００の異常発生（例えば排気ガス熱交換器２１０の不具合）を冷却水の温度に拠らずに判定することができ、すなわち、冷却水の温度検知が遅れるといったことがなく、これにより、エンジン冷却水回路２００の異常判定の即応性を向上させることが可能となる。 As described above, according to the present embodiment, the control device 150 causes the exhaust gas temperature difference (Ta) between the upstream side and the downstream side of the exhaust gas heat exchanger 210 in the exhaust direction D of the exhaust gas from the engine 110. When -Tb) is equal to or less than the predetermined value Ts, the occurrence of abnormality in the engine coolant circuit 200 is determined. Therefore, the abnormality determination of the engine coolant circuit 200 can be performed based on the temperature of the exhaust gas. The abnormality determination of the engine coolant circuit 200 that does not depend on the temperature can be performed. Specifically, when it is detected that the temperature difference (Ta−Tb) of the exhaust gas between the upstream side and the downstream side of the exhaust gas heat exchanger 210 is equal to or less than a predetermined value Ts, the cooling in the exhaust gas heat exchanger 210 is performed. It can be assumed that the heat absorption by the water is less than or equal to a predetermined amount (it can be considered that the cooling water is in a state where heat cannot be sufficiently exchanged), and therefore an abnormal occurrence of the engine cooling water circuit 200 (for example, an exhaust gas heat exchanger) 210) can be determined without depending on the temperature of the cooling water, that is, the detection of the temperature of the cooling water is not delayed, thereby improving the responsiveness of the abnormality determination of the engine cooling water circuit 200. It becomes possible to make it.
　本発明は、以上説明した実施の形態に限定されるものではなく、他のいろいろな形で実施することができる。そのため、かかる実施の形態はあらゆる点で単なる例示にすぎず、限定的に解釈してはならない。本発明の範囲は請求の範囲によって示すものであって、明細書本文には、なんら拘束されない。さらに、請求の範囲の均等範囲に属する変形や変更は、全て本発明の範囲内のものである。 The present invention is not limited to the embodiment described above, and can be implemented in various other forms. Therefore, such an embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.
　この出願は、２０１４年３月２６日に日本で出願された特願２０１４－０６３０５０号に基づく優先権を請求する。これに言及することにより、その全ての内容は本出願に組み込まれるものである。 This application claims priority based on Japanese Patent Application No. 2014-0663050 filed in Japan on March 26, 2014. By this reference, the entire contents thereof are incorporated into the present application.
　本発明は、冷却水を循環させてエンジンを冷却するエンジン冷却水回路に係るものであり、特に、冷却水の温度に拠らないエンジン冷却水回路の異常判定を行うための用途に適用できる。 The present invention relates to an engine cooling water circuit that circulates cooling water to cool the engine, and is particularly applicable to an application for determining abnormality of the engine cooling water circuit that does not depend on the temperature of the cooling water.
１００　　コージェネレーション装置
１１０　　エンジン
１１０ａ　シリンダヘッド側
１１０ｂ　シリンダブロック側
１１１　　冷却水流出口
１１２　　冷却水流入口
１２０　　発電機
１３０　　三元触媒
１４０　　排気経路
１４１　　第１排気経路
１４２　　第２排気経路
１５０　　制御装置（制御部の一例）
１５１　　処理部
１５２　　記憶部
１８１　　ラジエータファン
１８５　　排気サイレンサ
１９１　　上流側温度センサ
１９２　　下流側温度センサ
２００　　エンジン冷却水回路
２１０　　排気ガス熱交換器
２１１　　冷却水流入口
２１２　　冷却水流出口
２２０　　ラジエータ
２２１　　冷却水流入口
２２２　　冷却水流出口
２３０　　エンジン廃熱回収器
２３１　　冷却水流入口
２３２　　冷却水流出口
２３３　　流入口
２３４　　流出口
２４０　　冷却水経路
２５０　　冷却水ポンプ
２５１　　吸水部
２５２　　吐出部
２６０　　サーモスタット型切替弁
２６１　　冷却水流入口
２６２　　冷却水流出口
２６３　　冷却水流出口
２７０　　電動三方弁
２７１　　冷却水流入口
２７２　　冷却水流出口
２７３　　冷却水流出口
２７４　　駆動部
２８０　　水フィルタ
４００　　給湯機
４０１　　流出口
４０２　　流入口
４１０　　流入経路
４２０　　流出経路
Ｂ　　　　背面側
Ｃ　　　　循環方向
Ｄ　　　　排気方向
Ｆ　　　　正面側
Ｐ１　　　第１検出部
Ｐ２　　　第２検出部
Ｐ３　　　算出部
Ｐ４　　　判定部
Ｔｓ　　　所定値
Ｔａ　　　上流側温度
Ｔｂ　　　下流側温度 DESCRIPTION OF SYMBOLS 100 Cogeneration apparatus 110 Engine 110a Cylinder head side 110b Cylinder block side 111 Cooling water outlet 112 Cooling water inlet 120 Generator 130 Three-way catalyst 140 Exhaust path 141 First exhaust path 142 Second exhaust path 150 Controller (an example of control unit) )
151 Processing unit 152 Storage unit 181 Radiator fan 185 Exhaust silencer 191 Upstream temperature sensor 192 Downstream temperature sensor 200 Engine cooling water circuit 210 Exhaust gas heat exchanger 211 Cooling water inlet 212 Cooling water outlet 220 Radiator 221 Cooling water inlet 222 Cooling water flow Outlet 230 Engine waste heat recovery device 231 Cooling water inlet 232 Cooling water outlet 233 Inlet 234 Outlet 240 Cooling water path 250 Cooling water pump 251 Water suction part 252 Discharge part 260 Thermostat type switching valve 261 Cooling water inlet 262 Cooling water outlet 263 Cooling Water outlet 270 Electric three-way valve 271 Cooling water inlet 272 Cooling water outlet 273 Cooling water outlet 274 Drive unit 280 Water filter 400 Water heater 401 Outlet 402 Inlet 410 Inflow path 4 0 outflow path B back side C circulating direction D exhaust direction F front side P1 first detector P2 second detector P3 calculator P4 determination unit Ts predetermined value Ta upstream temperature Tb downstream temperature

Claims (1)

  1. 　冷却水を循環させてエンジンを冷却するエンジン冷却水回路であって、
    　ラジエータ、排気ガス熱交換器、エンジン廃熱回収器および冷却水ポンプを設け、
    　前記エンジンから前記排気ガス熱交換器を経由して前記ラジエータおよび／または前記エンジン廃熱回収器を通過して前記冷却水ポンプの吸水部に到って前記冷却水を前記エンジンに還流する回路を構成し、
    　前記エンジンからの排気ガスの排気方向において前記排気ガス熱交換器の上流側および下流側における前記排気ガスの温度差が所定値以下の場合に当該エンジン冷却水回路の異常発生を判定する制御部を設けたことを特徴とするエンジン冷却水回路。     An engine cooling water circuit that circulates cooling water to cool the engine,
    A radiator, exhaust gas heat exchanger, engine waste heat recovery unit and cooling water pump are installed.
    A circuit for passing the cooling water from the engine to the water absorption part of the cooling water pump through the radiator and / or the engine waste heat recovery unit via the exhaust gas heat exchanger and returning the cooling water to the engine; Configure
    A control unit that determines whether the engine cooling water circuit is abnormal when a temperature difference between the exhaust gas upstream and downstream of the exhaust gas heat exchanger in the exhaust direction of the exhaust gas from the engine is a predetermined value or less; An engine coolant circuit characterized by being provided.
PCT/JP2015/053899 2014-03-26 2015-02-13 Engine coolant circuit WO2015146345A1 (en)

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JP2014-063050 2014-03-26
JP2014063050A JP2015183659A (en) 2014-03-26 2014-03-26 engine cooling water circuit

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63140264A (en) * 1986-12-01 1988-06-11 三菱電機株式会社 Engine drive type air-conditioning hot-water supply device
JPH05157006A (en) * 1991-11-29 1993-06-22 Kubota Corp Engine exhaust heat recovery device
JP2005069161A (en) * 2003-08-27 2005-03-17 Toyota Motor Corp Exhaust emission control device of internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63140264A (en) * 1986-12-01 1988-06-11 三菱電機株式会社 Engine drive type air-conditioning hot-water supply device
JPH05157006A (en) * 1991-11-29 1993-06-22 Kubota Corp Engine exhaust heat recovery device
JP2005069161A (en) * 2003-08-27 2005-03-17 Toyota Motor Corp Exhaust emission control device of internal combustion engine

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