JP4749289B2 - Intake device for vehicle engine - Google Patents

Description

  The present invention relates to an intake device for a vehicle engine.

2. Description of the Related Art Conventionally, a technique for preventing a temperature increase in an intake duct of an engine, in other words, a temperature increase of engine intake air and suppressing a decrease in engine output is known (see Patent Document 1).
JP 2000-257520 A

  However, although the conventional invention can prevent the temperature rise in the intake duct of the engine, there is a problem in that it cannot be controlled by raising or lowering the temperature in the intake duct of the engine.

  In order to further improve the engine output performance and fuel consumption performance, it is preferable to control the temperature of the fuel in addition to the temperature in the intake duct of the engine.

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to control the temperature of the intake air of the engine and the temperature of the fuel in accordance with the temperature in the intake duct. An engine intake device for a vehicle that can exhibit the engine output performance and fuel efficiency performance of the vehicle.

According to the first aspect of the present invention, an engine intake duct is housed inside the door means capable of introducing vehicle running wind, and an opening for introducing warm air from the engine room when the door means is closed. an intake box with the door, the intake box can warm tube introducing warm air heated to high temperature by the exhaust heat of the engine within, a temperature sensor for detecting the temperature in the intake duct, it is detected by the temperature sensor the controls the amount of introduced warm air from the introduced amount and the engine compartment of a vehicle traveling wind by the door means in response to the temperature in the intake duct, a controllable control means the introduction amount of the warm air by the warm air pipe was , characterized in that it comprises a.

In the first aspect of the present invention, an engine intake duct is housed in the interior, door means capable of introducing vehicle running wind, and warm air from the engine room is introduced when the door means is closed. An intake box that has an opening to be heated, a warm air pipe that can introduce warm air that has become hot due to heat of engine exhaust in the intake box, a temperature sensor that detects a temperature in the intake duct, and the temperature sensor It controls the amount of introduced warm air from said detected engine room introduction amount of the vehicle traveling wind and by the door means in response to the temperature of the intake duct in, capable of controlling the introduction amount of the warm air by the warm air tube to provide a control unit, and can control the temperature of the intake air of the engine according to the temperature of the intake duct, can exert desired engine output performance and fuel efficiency.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
FIG. 1 is a system configuration diagram illustrating an intake device for a vehicle engine according to a first embodiment of the present invention, and FIGS.

First, the overall configuration will be described.
As shown in FIG. 1, the first embodiment includes an engine 1, a control unit 2 (corresponding to control means in claims), an exhaust device 3, an intake device 4, and a fuel device 5.

The engine 1 includes a PHASE sensor 6, a POS sensor 7, a water temperature sensor 8, and the like.
The PHASE sensor 6 detects the crank angle, the POS sensor 7 discriminates the cylinder, and the control unit 2 controls the injection timing and the like of each injector from these two signals.
The water temperature sensor 8 detects the water temperature in the engine 1, and from this signal, the control unit 2 controls the fuel flow rate, the correction of the fuel cut region, and the like.

Further, as the exhaust device 3, a catalytic converter 10, a muffler 11, and the like are connected to the downstream side of the exhaust manifold 9 of the engine 1.
The exhaust pipe 12 directly below the catalytic converter 10 is provided with a warm air member 13 so as to surround a part thereof, and a plurality of small holes 13a are formed in a part of the outer periphery of the warm air member 13, and each small hole is formed. Outside air can be introduced into an internal space 13b formed between 3a and the exhaust pipe 12.
Further, one end of the warm air pipe 14 is connected to the internal space 13 b to the warm air member 13, while the other end is connected to an intake duct 17 in an intake box 16 to be described later via a control valve 15. ing.

  Further, an intake duct 17 accommodated in an intake box 16 is connected to the upstream side of the intake manifold 18 of the engine 1 as the intake device 4.

A door 19 (corresponding to the door means in the claims) capable of introducing vehicle traveling wind is provided on the vehicle front side of the intake box 16, while an opening 20 is provided on the vehicle rear side.
Note that the door 19 has an opening / closing structure employing an appropriate structure such as a general flap structure or a shutter structure driven by a motor (not shown).

In the intake duct 17, an intake port 21 is disposed in a state of facing the door 19 of the intake box 16, and an air cleaner 22, a throttle sensor 23, and an air flow meter 24 are accommodated behind the intake port 21.
The air cleaner 22 is for removing dust floating in the air taken in from the intake port 21 and for eliminating the intake noise, and a general dry or wet type is adopted.
The throttle sensor 23 detects the acceleration state of the vehicle from the throttle valve opening of the electronically controlled throttle, and the control unit 2 controls correction of the fuel injection amount and the like from this signal.
The air flow meter 24 detects the intake air amount, and the control unit 2 controls the basic injection amount that matches the engine load from this signal. The air flow meter 24 of the first embodiment incorporates a temperature sensor that detects the temperature in the intake duct 17. A temperature sensor may be provided separately.

The fuel device 5 includes a fuel tank 25 and a fuel pump 26 accommodated in the fuel tank 25.
One end of a fuel pipe 27 is connected to the fuel pump 26, and the other end is connected to a fuel injector 28 via an intake duct 17 in an intake box 16 described later.

  In the first embodiment, the other end of the warm air pipe 14 passes through the intake box 16 and is connected to the vicinity of the intake port 21 of the intake duct 17. A heat exchanging portion 27 a that passes through 16 and meanders in the vicinity of the rear of the air cleaner 22 in the intake duct 17 is provided.

  The warm air pipe 14 may be connected in communication between the intake box 16 and the intake duct 17. Similarly, the heat exchange part 27 a may be provided between the intake box 16 and the intake duct 17.

  In addition, an accelerator sensor signal for detecting the opening of the accelerator 29 is input to the control unit 2, and although not shown, the door 19 opening / closing control signal, the control valve 15 opening / closing control signal, and the key SW (IGN) Signals, air fuel consumption control signals, battery voltage signals, vehicle speed signals, engine / AT integrated control input signals, and the like are appropriately input / output.

Next, the operation will be described.
In the vehicle engine intake device configured as described above, the control unit 2 controls the door 19 and the control so that the temperature in the intake duct 17 is maintained at a predetermined temperature (around 30 ° C.) that is optimum as intake air of the engine 1. The opening / closing amount of the valve 15 is adjusted.

  For example, when the temperature in the intake duct 17 becomes high in summer or the like, as shown in FIG. 2, the control unit 2 opens the door 19 so that the vehicle running wind (illustrated by a broken line arrow) is drawn in the intake box 16. While being introduced, the control valve 15 is fully closed.

  At this time, the intake duct 17 is cooled from the outside by the vehicle traveling wind passing from the door 19 of the intake box 16 to the opening 20, and thus, the above-described inside of the intake duct 17 is not adversely affected by the hot air in the engine room. The intake air having a predetermined temperature can be supplied to the engine 1.

  Further, the fuel in the fuel pipe 27 that has risen to substantially the same temperature as the outside air is meandered by the heat exchanging portion 27 a in the intake duct 17, so that it can be cooled by the vehicle traveling wind and supplied to the engine 1.

  Accordingly, it is possible to prevent the output of the engine 1 from being reduced and improve the fuel efficiency.

  On the other hand, when the temperature in the intake duct 17 becomes low in winter or the like, as shown in FIG. 3, the control unit 2 fully opens the control valve 15 to introduce the warm air from the warm air pipe 14 into the intake box 16. Thus, the inside of the intake box 16 is warmed, while the door 19 is fully closed.

  At this time, the intake duct 17 is further warmed from the outside by the hot air in the room of the engine 1 (shown by broken line arrows) that flows in from the opening 20 of the intake box 16, and thereby reaches the predetermined temperature in the intake duct 17. Intake air can be supplied to the engine 1.

  Further, the fuel in the fuel pipe 27 that has decreased to substantially the same temperature as the outside air is meandered by the heat exchanging portion 27 a in the intake duct 17, so that it can be warmed and supplied to the engine 1.

  Accordingly, it is possible to prevent the output of the engine 1 from being reduced and improve the fuel efficiency.

In the above description, the door 19 or the control valve 15 is fully closed or fully opened. However, the control unit 2 finely adjusts the opening / closing amounts of the door 19 and the control valve 15 while performing feedback control so as to maintain the predetermined temperature. Do.
In addition, it is preferable to always keep the intake air temperature of the engine 1 at a predetermined temperature (around 30 ° C.). However, if the temperature is set to a high temperature and a low temperature, control is performed each time. can get.

  Therefore, in the vehicle engine intake device of the first embodiment, the intake air temperature and fuel temperature of the engine 1 can be prevented from excessively rising under high temperature conditions such as summertime, while the engine under low temperature conditions such as wintertime. Therefore, it is possible to prevent the intake air temperature and fuel temperature of the engine 1 from excessively decreasing, and to improve the engine 1 output and the fuel efficiency.

  Further, when the fuel in the fuel pipe 27 is returned from the engine 1 side to the fuel tank 25 by the return pipe, the temperature of the fuel becomes particularly high. Therefore, it is preferable to employ the present invention.

In addition, as a result of a bench test comparing the fuel efficiency of a general vehicle and a vehicle adopting the present invention, the vehicle employing the present invention improves the fuel efficiency performance by 3% to 5% compared to a general vehicle. Prove that you can.
In this experiment, as an example, driving at an outside temperature of 35 ° C. and 120 km / h was assumed as a vehicle condition in summer, and driving at an outside temperature of −20 ° C. and 40 km / h was assumed as a vehicle condition in winter. .

Next, the effect will be described.
As described above, in the vehicle engine intake device of the first embodiment, the intake duct 17 of the engine 1 is housed inside, and has door means (door 19) capable of introducing vehicle running wind. Detected by the intake box 16, a warm air pipe 14 that can introduce warm air that has become hot due to the heat of exhaust from the engine 1 into the intake box 16, a temperature sensor that detects the temperature in the intake duct 17, and the temperature sensor. Since control means (control unit 2) capable of controlling the introduction amount of the vehicle traveling wind by the door means (door 19) and the introduction amount of the warm air by the warm air pipe 14 according to the temperature in the intake duct 17 is provided, The temperature of the intake air of the engine 1 can be controlled according to the temperature of the engine, and desired engine output performance and fuel consumption performance can be exhibited.

  Further, since a part of the fuel pipe 27 of the engine 1 is disposed in the intake box 16, the fuel temperature can be controlled, and desired engine output performance and fuel consumption performance can be exhibited.

  Further, the control means (control unit 2) controls the introduction amount of the vehicle traveling wind by the door means (door 19) and the introduction amount of the warm air by the warm air pipe 14 so as to keep the temperature in the intake duct 17 at a predetermined temperature. This makes it possible to supply intake air and fuel having a stable temperature to the engine 1, which is preferable.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, the arrangement, structure, shape, material, and the like of each member described in this embodiment can be set as appropriate.

  It is naturally conceivable to provide a fan for sending warm air to the intake duct 17 in the middle of the warm air pipe 14.

FIG. 1 is a system configuration diagram showing an intake device for a vehicle engine according to a first embodiment of the present invention. It is a figure explaining the effect | action of the intake device of the vehicle engine of the present Example 1. FIG. It is a figure explaining the effect | action of the intake device of the vehicle engine of the present Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Control part 3 Exhaust device 4 Intake device 5 Fuel device 6 PHASE sensor 7 POS sensor 8 Water temperature sensor 9 Exhaust manifold 10 Catalytic converter 11 Muffler 12 Exhaust pipe 13 Warm air member 13a Small hole 13b Internal space 14 Warm air pipe 15 Control valve 16 Intake box 17 Intake duct 18 Intake manifold 19 Door 20 Opening portion 21 Inlet port 22 Air cleaner 23 Throttle sensor 24 Air flow meter 25 Fuel tank 26 Fuel pump 27 Fuel pipe 27a Heat exchange portion 28 Fuel injector 29 Accelerator

Claims (3)

An intake box having an intake duct of an engine housed therein and capable of introducing vehicle running wind; and an opening for introducing warm air from the engine room when the door means is closed ;
A warm air pipe capable of introducing warm air that has become hot due to the heat of engine exhaust in the intake box;
A temperature sensor for detecting the temperature in the intake duct;
Controls the amount of introduced warm air from the introduced amount and the engine compartment of a vehicle traveling wind by the door means in response to the temperature within said air intake duct detected by the temperature sensor, the introduction amount of the warm air by the warm air tube Controllable control means ;
An air intake device for a vehicle engine, comprising: The intake device for a vehicle engine according to claim 1,
An intake system for a vehicle engine, wherein a part of an engine fuel pipe is disposed in the intake box. The vehicle engine intake device according to claim 1,
The door means is provided at the front of the vehicle, and the opening is provided at the rear of the vehicle.
In the intake duct, an intake port is arranged facing the door means of the intake box,
An air intake system for a vehicle engine, wherein when the door means is fully closed, air flowing in from the opening passes between the intake duct and the intake box and is supplied to the intake port.

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