JP2016008567A - Internal combustion engine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten warming-up time in restarting an internal combustion engine for a vehicle after stopping operation for 1-2 hours.SOLUTION: A tank 17 exposed to an engine room 6 is provided in a halfway of a cooling water passage. In restarting, cooling water retained in the tank 17 is circulated to an engine body 3. The tank 17 is exposed to the engine room 6, and a temperature drop is smaller than that of the engine body 3, and therefore, the cooling water at a high temperature is supplied to the engine body 3, and early warming-up can be achieved. When a tank 17 is set to be exposed to sunlight 22 through a front grille 20, the tank 17 is actively warmed and the cooling water can be maintained in a high temperature state, which is more preferable.

Description

  The present invention relates to a water-cooled (liquid-cooled) vehicle internal combustion engine.

  An internal combustion engine for a vehicle is generally water-cooled, and the flow of cooling water is controlled by the engine temperature (for example, Patent Document 1). In other words, a thermo valve that opens and closes at the temperature of the cooling water to control the water flow to the radiator is arranged in the middle of the cooling passage. In a warm-up operation state where the engine temperature is low, the thermo valve is closed and the cooling water is Circulates through the cylinder head, cylinder block and heater without flowing to the radiator, and when the engine is warmed up and the temperature of the cooling water rises to a certain level, the thermo valve opens and the cooling water circulates through the radiator. ing. There has also been proposed a configuration in which only the cylinder head is cooled without cooling the cylinder block during the warm-up operation.

JP 2013-185535 A

  Cooling water accumulates in the jacket and radiator provided in the cylinder head and cylinder block, and in the piping, but when the engine stops operating, the temperature of the engine body and piping etc. decreases, and the cooling water is accordingly reduced. The temperature will also decrease. For this reason, when the temperature of the engine decreases to a certain extent, the next start is a cold start, and the warm-up operation is performed until the engine warms up.

  In the warm-up operation state, the oil viscosity is high, the mechanical loss is large, and the combustion tends to become unstable.Therefore, the fuel injection amount is set high. We use a lot. Therefore, it is preferable that the warm-up operation time is as short as possible from the viewpoint of fuel consumption.

  The present invention has been made in view of such a current situation. For example, the engine is parked for about 1 to 2 hours after shopping at a supermarket or at a medical institution, and then restarted. It is intended to shorten the warm-up operation time when the vehicle is restarted before the vehicle has cooled down.

  The invention of the present application includes the constructions of claims 1 and 2, wherein the invention of claim 1 is a water-cooled internal combustion engine mounted in an engine room at the front of the vehicle, in the middle of the cooling water passage, at the time of start-up. A tank for storing cooling water flowing into the main body is provided so as to be exposed to the engine room.

  According to a second aspect of the present invention, in the first aspect, the tank is disposed at a site where sunlight enters the front of the engine room.

  The lower the temperature of the cylinder block in the engine body is, the lower the temperature is, and the highest temperature is in the cylinder head. However, the metal constituting the cylinder block and the cylinder head has high heat conductivity and has a surface area with respect to a unit amount of cooling water. Since the ratio is large, it can be said that the rate of temperature decrease after operation is fast. In contrast, the tank is exposed to the engine room, but air is a poor conductor of heat and has low heat dissipation, and since the tank has a small surface area per unit capacity, heat dissipation is slow. For this reason, for example, even if 1-2 hours have passed since the operation of the engine was exhibited, a considerable temperature can be maintained (similar to a hot water bottle).

  And in a state where some heat has remained in the engine body after about 1 to 2 hours have passed since the engine was stopped, when it restarts, it enters the warm-up operation mode, but is kept warm and stored in the tank. As the cooling water circulates through the engine body, the engine body can be warmed up early. Thereby, it can contribute to the improvement of a fuel consumption.

  If the structure of Claim 2 is employ | adopted, since it will become possible to raise the heat retention of cooling water further or to raise temperature by the sunlight hitting a tank, it can contribute further to early warm-up.

It is a schematic plan view of an embodiment. It is the II-II sectional view taken on the line of FIG.

(1) Structure of Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. In the following, front / rear / left / right words are used to specify the direction, but this is based on the driver's direction.

  In FIG. 1, the arrangement of the internal combustion engine is roughly displayed. The internal combustion engine includes a cylinder block 1, a cylinder head 2, and an engine main body 3 as main elements, and is mounted in an engine room 6 of a vehicle 5 with a crank axis 4 being horizontally oriented. A cylinder head cover 7 is fixed to the upper surface of the cylinder head 2, and an oil pan 8 is fixed to the temporary surface of the cylinder block 1.

  The internal combustion engine of the present embodiment is a pre-exhaust type three cylinder, and an exhaust manifold 9 is fixed to the front surface of the cylinder head 2. The collective portion 9a of the exhaust manifold 9 extends in the horizontal direction, and the collective portion 9a is bent obliquely downward on the left outer side of the engine body 3, and the catalyst case 10 is connected thereto.

  On the front side of the engine body 3, a radiator 11 is disposed in a state of being close to the catalyst case 10, and an air conditioner condenser (condenser) 12 is disposed on the radiator 11. Both the radiator 11 and the capacitor 12 partially overlap with the engine main body 3 in a front view of the vehicle, but the arrangement mode can be arbitrarily set.

  A water pump 13 is disposed on one side of the cylinder block 1 opposite to the catalyst case 10, while a thermo valve is incorporated on the other side of the cylinder head 2 opposite to the water pump 13. The cooling water control unit 14 is provided, and the cooling water control unit 14 and the radiator 11 are connected by feed pipes 15 and 16. More precisely, the feed pipe 15 is connected to the upper tank of the radiator 11 and the return pipe 16 is connected to the lower tank.

  The upper surface of the radiator 11 is located below the exhaust manifold 9, and the capacitor 12 is located above the exhaust manifold 9. A tank 17 for storing cooling water is disposed approximately in a portion of the exhaust manifold 9 on the near side of the horizontal gathering portion 9a. The tank 17 has a cylindrical shape and is disposed with its axis lined in the horizontal direction (may be installed vertically), the inlet port 18 is connected to the cooling water control unit 14 by an outward pipe 19, and the outlet port 20 is connected to a water pipe 21 by a return pipe 21. Connected to the pump 13. Although the capacity of the tank 17 is proportional to the displacement of the engine body 3, for example, a light vehicle with a displacement of 660 cc needs about 1 liter.

  Further, the tank 17 is arranged close to the front grip 22 of the vehicle. Although the front hole 22 has a ventilation hole 23, sunlight 24 can enter through the ventilation hole 23, and the tank 17 is arranged so that the sunlight 24 can hit.

  The horizontal collective portion 9 a of the exhaust manifold 9 is covered from the front with a shielding plate (insulator) 25. A reflector 26 that reflects sunlight toward the tank 17 is disposed below the tank 17. The reflection plate 26 is continuous with the shielding plate 25, but may be separated from each other. Further, the ventilation hole 23 of the front grille is closed with a transparent plate, and the shape of the reflection plate is configured to cover the lower side, the rear side, and the upper side of the tank 17, and the transparent plate and the reflection plate 26 surround the tank. It may be structured. In other words, the tank may be arranged in a closed space formed by the transmissive plate and the reflection plate 26.

(2) Summary In the above configuration, the cooling water received around the engine body 3 returns to the water pump 13 via the tank 17, but when the engine is stopped, the high temperature cooling water is accumulated in the tank 17. Will remain. The tank 17 has a small surface area with respect to the capacity, and air is a defective conductor of heat. Therefore, the temperature drop of the cooling water inside the tank 17 is slower than the temperature drop of the engine body 3.

  For this reason, for example, when the engine is stopped for about 1 to 2 hours and then restarted, the cooling water inside the tank 17 is still maintained at a considerable temperature. As a result, at the time of restart, the engine body 3 can be heated up early to shorten the warm-up time.

  In particular, when the tank 17 is arranged close to the front grille 22 as in the embodiment, when the vehicle is parked outdoors, the tank 17 can be warmed by sunlight 24. The temperature can be increased to an early warm-up. Providing the reflecting plate 26 as in the embodiment is particularly preferable because the irradiation area of sunlight can be enlarged.

  Further, when the tank 17 is arranged in front of the exhaust manifold 9 as in the embodiment, the tank 17 is also heated by the residual heat of the exhaust manifold 9, so that the temperature drop of the cooling water is suppressed and further contribution to early warm-up is achieved. it can. In addition, if the tank 17 is covered from above and below with the condenser 12 and the radiator 11 as in the embodiment, heat tends to be trapped behind the tank 17, so that the heat of the exhaust manifold 9 is efficiently transferred to the tank 17. I can tell you. As a result, the cooling water can be maintained in the temperature lowered state, and early warm-up at the time of restart can be further ensured.

  In the above description, the outlet port 19 of the tank 17 and the water pump 13 are connected. However, if the cooling water circulates through the radiator 11 before the operation is stopped, the cooling water whose temperature has decreased in the radiator 11 It will be accumulated in. On the other hand, as shown by a one-dot chain line in FIG. 1, the outlet port 20 of the tank 17 and the cooling water control unit 14 are connected by an intermediate pipe 27, and the cooling water passes through the tank 17 to the radiator 11. If the cooling water flowing in and cooled by the radiator 11 is set to return to the water pump 13 from the cooling water control unit 14 through the return pipe 28, there is an advantage that the cooling water having the highest temperature can be stored in the tank 17.

  The present invention can be embodied in various ways other than the above-described embodiment. For example, it is possible to actively warm the tank with exhaust gas. It is also possible to adopt a configuration in which the cooling water circulates through the tank only during the warm-up operation and does not pass through the tank during the normal operation (in this case, it is necessary to provide a switching valve). Furthermore, it is possible to cover the tank with a heat insulating material.

  The present invention is actually applicable to an internal combustion engine for a vehicle. Therefore, it can be used industrially.

2 Cylinder Head 3 Engine Body 6 Engine Room 9 Exhaust Manifold 9a Exhaust Manifold Assembly 11 Radiator 12 Air Conditioner Condenser 13 Water Pump 14 Cooling Water Control Unit 17 Tank

Claims (2)

A water-cooled internal combustion engine mounted in an engine room in front of the vehicle,
In the middle of the cooling water passage, a tank for storing cooling water flowing into the engine main body at the time of starting is provided so as to be exposed to the engine room.
Internal combustion engine for vehicles. The tank is arranged at a site where sunlight enters the front of the engine room.
The internal combustion engine for a vehicle according to claim 1.

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