TW451027B - Intake air temperature control method and device - Google Patents

Abstract

The present invention aims to reduce losses during partial-load operation and effectively avoid any reduction of output power during full-load operation. A method of controlling a sucked air temperature in an internal combustion engine, characterized by comprising the steps of varying the opening and closing amount of a hot air valve (3) according to a variation in temperature of the sucked air comprising warm air, outside air, or both of them, maintaining the temperature of the sucked air within a constant range by controlling the hot air-outside air mixing ratio, controlling the hot air-outside air mixing ratio based on a variation of negative pressure in an intake chamber (13) and also based on the load conditions specified from engine control parameters and, in a particular condition, bringing the hot air valve (3) forcibly into an outside air introducing state irrespective of the temperature of the sucked air.

Description

45102 "?

The present invention relates to a method for controlling the temperature of intake air and an apparatus therefor. The conventional technology uses the carburetor engine in the car. From the late autumn to the early spring, two ice problems often occur. 4 The money is too high and cannot be fully seen in rainy days. In the case of icing, it will cause idling irregularities or reduce This kind of defect is now used as an automatic temperature-adjusting air filter that will appropriately generate U gas around the exhaust manifold as suction air. The self-conditioning air cleaner (referred to as a conventional device) will be described with reference to FIG. 5. In addition, Fig. 5 is a schematic diagram showing a temperature control system provided with the conventional device. As shown in FIG. 5, the conventional device 100 is installed in the suction system. Inhaled air, such as dust, is removed by the air cleaner 101, passes through the carburetor 102, and becomes mixed gas, which is then sent to the intake manifold 103. The mixed gas sent to the intake manifold 103 is sent to the engine 107 for combustion. A hot air cap 105 is provided around the exhaust manifold 104. When the engine 107 is started, the air in the hot air cap 105 is heated and becomes heated. The heater passes through the heating path HW and is sent to the conventional device 1 00 ^, while the other air (hereinafter referred to as the outside air) passes through the engine room, and then passes through the external air path CW and is then sent to the conventional device 10〇β. The main body of the passageway of the conventional device 100 is provided within the £ 100 and is connected to the outside air intake port 100b and the heating intake port connected to the heating path HW.

451 〇 2 7 V. Description of the invention (2) 100c. A plate-shaped hot gas valve 100d is arranged between the outside air inlet 100b and the heating inlet 100c, and the outside air inlet is opened and closed by the rocking action of the hot gas valve 100d (see the arrow in FIG. 5). 100b and heating access 100c. According to the ratio of opening and closing, that is, the opening degree of the hot air valve 丨 0 0d determines the mixing ratio of outside air and heating, and determines the temperature of the intake air. Therefore, by controlling the opening of the hot gas valve 100 d to adjust the mixing ratio of outside air and heating, the temperature of the intake air is controlled. The thermostat 10 6 controls the opening of the hot gas valve 100 d. The thermostat 1 〇6 is installed in the channel body 10 0a 'with a spring retainer 106a and a shaft 106b »The shaft 106b is installed in front of the spring retainer 〇6a, and uses the expansion and contraction of the soil 4 And the function of the spring 10 6c and the spring retainer 106a retreat together. In addition, the front end of the shaft 106b is connected via the link mechanism and the bottom of the hot gas valve 100d from the bottom of both sides of the shaft to support the hot gas valve i00d, and the shaft is moved forward and backward with the bottom as a fulcrum. According to the conventional apparatus 100 'described above, avoiding the intake of air, especially in the vicinity of the throttle valve, problems such as icing and idling may occur. K < 10,000 questions generally have the following problems. That is, in the driving state (hereinafter referred to as part-load operation), especially during low-load driving such as ~ part-load operation, the current flow is almost closed = or the path of the part, and the suction resistance becomes the maximum. Air 4 reduces this pumping loss and requires opening the throttle. The opening degree of the valve is closely related to the vehicle speed, but the opening speed of the throttle is increased at 4J, and the speed becomes faster as a result. That is, it ca n’t solve the problem of low-load driving, second engine rotation. Page 5 451027 5. Description of the invention (3) Sending loss. Kexian, ## When the temperature of 1 gas is set to high, the flow rate of 4 gas is reduced because the intake air is set to ON. Therefore, it is possible to reduce the flow rate and reduce the flow loss. When the full-load turning surface is fully opened / the accelerator pedal is fully depressed (hereafter referred to as β), because the flow valve is fully opened, the suction resistance and force system are most required during full-load operation, because a large output is required. Power requires a higher temperature, and the temperature of the intake air needs to be adjusted in accordance with the load of the vehicle. In order to solve the above-mentioned problems, a conventional temperature control device for inhaling air (hereinafter referred to as an improved conventional device), which is a 100 ^ type, has been developed and disclosed in Japanese Unexamined Patent Publication No. 6_1 93523. „The improved conventional device has the same structure as the conventional device 100, with a control device for closing the hot gas valve corresponding to the negative pressure change in the intake chamber. The full-flow valve is fully open (at full load operation), and the air intake The negative pressure in the room is reduced, but the control device of the negative pressure is forced to close the hot gas valve regardless of the temperature of the intake air. As a result, when a large output power is required for full-load operation, a low-temperature outside gas can be introduced to improve the combustion efficiency. However, the control device does not work during partial load operation, and keeps the temperature of the intake air in a fixed range like the conventional device. If the temperature is set to a relatively high temperature, it is especially important during partial load operation. Reduces large pumping loss when driving at low load. From the above, if the improved conventional device is used, compared with the conventional device 100, the fuel consumption ratio can be improved. Page 6

SV02J V. Description of the invention (4) Full-load study of the problem to be solved by the invention: The device only depends on the negative pressure change in the air intake chamber. Specific == oil: and there is a problem with its specific accuracy. This negative pressure change is made of a specific material, and only outside air can be generated according to the condition of the self-vehicle. The problem of transportation is to solve this problem. Its purpose is to reduce some negative 0. ^ delivery loss, and effective prevention Output power is reduced during full load operation to increase fuel consumption. It is used to control the temperature conversion ratio, and the indoor temperature and the outdoor temperature are irrelevant to solve the problem. It is characterized by the heat intake air pressure change and the heating force forcing according to the chemical control. The means to determine the subject is controlled by: the temperature of the opening and closing gas of the external air and heating valve and the mixing ratio according to its own, and the hot gas valve is set to solve the problem, including: Or the quantity change is held by a solid engine to control a specific external air problem, using a temperature of the intake air, the temperature of the intake air, and the range of the mixed air between the two sides that controls the mix of outside air and heating. Intake system parameters specify load condition control conditions and the temperature of the intake air. Placed on with a suction air

4517 V. Description of the invention (5) The hot gas valve 'opens and closes each inlet of heating and outside air; and the sub-thermostat' controls the amount of opening and closing of the hot gas valve to keep the temperature of the intake air composed of the outside air and the fixed temperature Zhifan heating or cooling is characterized by including: a negative pressure circuit, a solenoid coil, which acts according to the change of the negative pressure in the intake chamber; opening and closing the negative pressure circuit, and controlling the negative dust circuit as a load-specific device, controlled by the engine After the specific load state is parameterized, the solenoid opens and closes the load state from the load state; and the negative pressure actuator uses the action of the negative pressure circuit; by following the change of the negative pressure in the intake chamber and according to the self-engine The specific load state of the control parameter controls the mixing ratio of outside air and heating. A certain condition is irrelevant to the temperature of the intake air, and the hot air valve is forced to the outside air introduction state. With the above methods, the pumping loss during partial load operation is reduced, and the output power can be prevented from decreasing during full load operation. Embodiments of the Invention The present invention will be specifically described with reference to the drawings according to the embodiments. Fig. 1 shows the structure of a temperature control device for inhaling air in the present embodiment (hereinafter referred to as control device 1). The band arrows in Fig. 1 indicate the flow paths of heating, outside air, and inhaled air. The passage main body 2 is attached to the inlet of the air cleaner 101. A passage 23 through which suction air flows is formed inside the passage Ben Zhao 2. The pathway 23 branches into two

Page 8

V. Description of the invention (6) The branch "is formed by branching into one of the two branches to form a gas inlet 21 outside the external gas path Ctf. A heating inlet 22 connected to the heating path HW is formed on the other side. A hot gas room 3 is arranged at the connection between the outside air inlet 21 and the heating inlet 22, and the hot gas valve 3 swings freely with the bottom 31 as a fulcrum (refer to the arrow of 圏 1). ^ The hot gas valve 3 of this embodiment is plate-shaped. The external air intake opening 21 and the heating intake opening 22 are opened and closed by this shaking. The bottom 31 of the hot air chamber 3 and the shaft 41 which can form a link mechanism are connected to rotate freely. The shaft 41 is moved forward and backward by the action of the element 43, and the hot gas valve 3 is rocked by the forward and backward movement. Furthermore, in addition to the shaft 41 at the bottom portion 31 of the hot air pump 3, the forward and backward lever 51 of the negative pressure actuator 5 is connected to freely rotate and a link mechanism can be formed. Then the forward and backward lever 51-generally use the action of the forward and backward lever 51 to be located in the reverse position (left position in Fig. 1), and does not interfere with the forward and backward movement of the shaft 41, and does not affect the swing of the hot gas valve 3. However, when the negative pressure actuator 5 is released and moved to the standing position (moving to the right in FIG. 1), the bottom portion 31 of the hot air chamber 3 is forced out. As a result, the hot gas valve 3 opens the outside air inlet 21 and completely closes the heating inlet 22. The inhaled air is only outside air, only heating or its mixture. The temperature of the inhaled air is determined by the mixture ratio of outside air and heating. In addition, since the generation of heating has been described in the conventional technology, detailed description is omitted here. The larger the proportion of heating that starts with the engine 107 (see Figure 5), the higher the temperature of the intake air, and the temperature rises. The mixing ratio of the outside air and heating is opened and closed by the hot air valve 3 and the outside air inlet 21 and the heater inlet. The amount of 22 (hereinafter referred to as the valve opening and closing amount). In addition, the hot gas valve 3 of this embodiment changes the opening and closing amount by shaking.

Page 9 451〇2 7 V. Description of the invention (7) In the relationship of opening one party, closing the other party. Therefore, in the following description, it is convenient to take the state where the heating intake port 22 is closed as the reference. “Open” means that the heating intake port 22 is opened from the closed state and moved in the direction of closing the outside air intake port 21. "Means the opposite. Moreover, the state in which the outside air intake port 21 is opened and the heating intake port 22 is completely closed is the "outdoor air introduction state". The suction air passes through the passage 23 in the passage body 2 and is sent to the air cleaner 101. The suction air for removing dust and the like by the air cleaner 101 passes through the throttle chamber 11 which reduces the diameter of the flow path. A throttle valve 8 is provided in the throttle chamber 1 丨. The amount of rotation of the flow control valve 8 and the depression of the accelerator pedal are changed from the closed position perpendicular to the flow direction of the intake air to the fully open position in parallel. A negative pressure source inlet 71 is formed in the intake chamber 13 from the throttle valve 8 to the engine 107 (refer to FIG. 5). A negative pressure circuit is formed between the negative pressure source inlet and the negative pressure actuator 5. 7. During partial load operation, the throttle valve 8 restricts the flow rate of the intake air, and the negative pressure in the intake chamber 13 becomes large. As a result, the load state is changed from the negative pressure, and as a result, the negative pressure circuit 7 is activated, and the negative pressure actuator 5 is operated. That is, when the negative pressure actuator 5 is actuated, the forward and backward lever 5 丨 resists the spring 52 and moves backwards! Move to the left), and release the interference on the hot air 阙 3. As a result, the rocking of the hot gas valve 3 is affected only by the thermostat 4. When the box 4 is turned on for nine loads, the throttle valve 8 is opened, and the suction resistance is reduced according to the „, ά ^ & Α Yu 疋, the negative pressure in the intake chamber 13 is reduced. Nengye Nengtian X Α load state, the negative pressure circuit 7 acts in accordance with the load state to release the action of the negative pressure caused by the R ^ double actuator 5. As a result, the forward and backward lever

451027 V. Description of the invention (8) 51 Use the action of the spring 5 2 to move to the standing position, that is, the heat valve 3 in the right direction of FIG. The negative pressure circuit 7 is provided with a solenoid 6 composed of a 3-port solenoid coil. The solenoid 6 opens and closes the negative pressure circuit 7 and controls the function of the negative pressure circuit 7. That is, when the solenoid 6 opens the negative pressure circuit 7, the change in the negative pressure of the intake chamber 13 acts as the negative pressure circuit 7 'acts directly on the negative pressure actuator 5; when the negative pressure circuit 7 is closed' the intake chamber 1 The 3 sides are closed, and the negative pressure actuator 5 is opened to the atmosphere β. Generally, the solenoid 6 is opened. However, when the solenoid 6 closes the negative pressure circuit 7 and is opened to the atmosphere, the operation of the negative pressure actuator 5 is forcibly released, and the forward and backward lever 51 is moved to the standing position by the action of the spring 52, that is, the right direction of FIG. The valve 3 is forcibly pushed down and is in an external air introduction state. The solenoid 6 of this embodiment closes the negative pressure circuit 7 under a certain condition ', that is, at a full load operation. Taking this situation as the premise, it is the ECU special load status of the load specific device. The following describes the specific load status using the ECU. The engine control parameters (hereinafter referred to as the control parameters) are sent to the ECU as information. ^ In this embodiment, the "control accelerator parameters" shown in Fig. 1 are "accelerator pedal opening", "engine speed", "engine water temperature", Self-vehicle information such as "vehicle speed" is not limited to such an example, as long as it is sufficient for a specific load state, other types of information are also possible. The ECU specifies the load status of the engine (see Fig. 5) from these control parameters. Furthermore, in the case of a specific full-load operation, an electric signal is transmitted to the solenoid 6 to close the negative pressure circuit 7. By the way, the judgment is under the condition of full-load operation and, for example, despite the accelerator pedal opening

Page 11 451 02 7 V. Description of the invention (9) That is, the change in negative pressure from the air intake chamber 13 and the specific load state of the control parameter, and the mixing ratio of outside air and heating is controlled according to the load state. In addition, as in this embodiment, for example, during a full-load operation, the operation of the negative pressure actuator 5 is used to force the hot gas valve 3 into an outside air introduction state regardless of the temperature of the intake air. The above is the outline of the control device 1 of this embodiment. Next, the specific structure of the thermostat 4 for forward and backward movement of the shaft 41 and the connection state between the forward and backward lever 51 and the shaft 41 and the bottom portion 31 of the hot gas valve will be described with reference to FIG. 2. Incidentally, FIG. 2 is a longitudinal sectional view showing the inside of the passage main body 2. As shown in FIG. First, the structure of the thermostat 4 will be described. r Before and after the spring holder 42 sandwiches the central inner wall 42d, front and rear inner holes 42b and 42c are drilled. In addition, the front and rear inner holes 42b and 42c are opened at the rear end. Further, a base end portion 41a of the shaft 41 is fitted in the front inner hole 42b, and a piston portion 43a of the element 43 is fitted in the rear inner hole 42c so as to be slidable. ^ The spring holder 42 and the element 43 are supported by the front and rear support members 12a'12b for positioning in the vertical direction. Incidentally, the spring holder 42 is supported in a forward-backward state in the front-rear direction by the support member 12a on the front side, and the element 43 is fixed by the support member 12b on the rear side. A flange portion 42a is formed on the outer periphery of the rear end of the spring holder 42, and a spring 44 is disposed between the flange portion 42a and the front support member 12a. This spring 44 always biases the spring holder 42 rearward. The outer periphery of the flange-shaped base end portion 41a formed at the rear end of the shaft 41 is freely slidable in the inner hole 42b of the front portion of the spring holder 42. At the base end portion 41a

Page 12 451027 5. The coil spring 41b is arranged between the invention description (ίο) and the central inner wall 42d, and the shaft 41 is always biased forward. In addition, 'the opening formed at the front end of the front inner hole 42b is bent toward the center to prevent the base end portion 41a from falling off' and * the piston portion 43a and the rod 43b which are built in the inner hole 42c of the rear portion of the spring holder 42 are moved from the front end (Fig. 2) (Front side) Habit β The haunch of the rod 43b is generated by the action of the wax and the elastic member (not shown) stored in the element 43. That is, "when the temperature change of the intake air is transmitted to the wax via the temperature sensing portion 43c," the wax expands and contracts to interfere with the rod 43b. The interference and the elastic member are balanced, and the rod 43b protrudes when it expands, and sinks when it contracts. The above is the structure of the thermostat 4. Next, the connection relationship between the forward and backward lever 51 and the shaft 41 and the bottom portion 31 of the hot gas valve 3 will be described. The bottom 31 of the hot gas valve 3 is supported on both sides by the passage body 2 shaft, and the hot gas valve 3 swings with the bottom 31 as a fulcrum. An upper connection portion 31a and a lower connection portion 31b are formed to protrude above and below the bottom 31. The front end portion of the upper connecting portion 31a 'forward and backward lever 51 is connected for free rotation via a pin 33a, and the front end portion of the lower connecting portion 31b' shaft 41 is connected for free rotation via a pin 33b. The forward and backward directions of the forward and backward lever 51 and the shaft 41 are parallel to each other. When the shaft 41 is moved forward and backward, the pin 3 3b is allowed to vibrate up and down with the rocking of the hot gas valve 3. However, before the negative pressure actuator 5 (see FIG. 1), the front end of the forward and backward lever 51 forms a gap 5 1 a along the forward and backward direction, and the pin 33a can move within the gap 51a. Therefore, if the negative pressure actuator 5 (refer to FIG. 1), when the forward and backward lever 5 is in the backward position, the pin 3 3a moves forward and backward with the rocking of the hot gas valve 51.

Page 13 ^ 451027 V. Description of the invention (11) ~ '~ -— The gap 51a can move freely. Therefore, the forward and backward lever 51 does not interfere with the rocking of the hot gas valve 3. However, when the operation of the negative pressure actuator 5 (refer to FIG. 1) is released, when the forward and backward lever 51 becomes the standing position, the swing β of the hot gas valve 3 is affected, that is, the operation of the negative pressure actuator 5 (refer to FIG. 1) is canceled. When the forward and backward lever 51 is advanced (moved to the figure / behind), the slit 51a catches the pin 33a. As a result, the hot gas valve 3 is forced to be forced out of the connection portion 31a and closed. In addition, along with this push-out, the pull shaft 4 and the elastic holder 42 are pulled. As a result, the spring holder 42 is temporarily separated from the rod 43b protruding from the piston portion 43a. The operation of the control device 1 will be described with reference to FIG. In addition, FIG. 3 is a schematic cross-sectional view showing the function of the broadcast control device 1. FIG. (A) is a state immediately after the engine is started, and FIG. (B) is a state in which the hot gas valve 3 is shaken with the temperature change of the intake air. Department indicates the outside air introduction state. Therefore, in Fig. (A) the hot gas valve 3 is fully opened. In Fig. (B) the hot gas valve 3 is opened corresponding to the temperature of the intake air, and in Fig. (C) the hot gas valve 3 is closed. In addition, the band-shaped arrow in FIG. 3 indicates the flow direction of outside air, heating, or inhaled air, and the general arrow indicates the swing direction of the hot gas valve 3 or the forward and backward lever 51 and backward direction. When the temperature of the intake air rises from the state of (a), the heat of the temperature change amount is transmitted to the wax inside through the temperature sensing portion 43c, and the wax expands by this heat transfer, and the rod 43b protrudes (see Fig. (B)). As a result, the spring holder 42 follows! The amount of protrusion moves forward, and the shaft 41 advances with this movement. The front end of the shaft 41 is connected to the lower connection portion 31b of the hot gas valve 3, and the upper end 32h of the hot gas valve 3 is tilted by this advance. As a result, the inflow of outside air increases, and the inflow of warm air decreases, and the temperature decreases. Conversely, if the temperature of the intake air is too low,

Page 14 451027 V. Description of the invention (12) The shaft 41 of the thermostat 4 moves backward, and the upper end of the hot gas valve 3 stands for 2 2 hours. As a result, the inflow of outside air decreases, and the inflow of warm air increases, and the temperature rises. With this effect, the temperature of the intake air can be maintained in a fixed range. In the above action state, the normal negative pressure actuator 5 (refer to Figure 丨) is operated, and the forward and backward lever 51 is located at the backward position. However, when the action of the negative pressure actuator 5 (see FIG. 1) is released, the forward and backward lever 51 becomes a standing position as shown in FIG. 3 (c). Circle 4 describes a control method and a specific control mode using the action of the control device 1 of this embodiment. Fig. 4 is a table β showing a control mode using the control method of this embodiment. In a partial load operation, it is necessary to suppress a substantial flow of intake air. Therefore, 'the general throttle valve 8 needs to restrict the flow of the intake air in the throttle chamber ^. In particular, when the throttle valve 8 is closed during idling or part-load operation, the suction resistance is maximized and the pumping loss is maximized. However, if the control device 1 of this embodiment is provided, since the thermostat 4 keeps the temperature of the intake air at a constant value at a higher temperature, the flow rate of the intake air is substantially restricted when the throttle valve 8 is opened. As a result, the suction resistance can be reduced, and the pumping loss can be reduced. In more detail, when the temperature of the intake air rises and remains within a fixed range, the volume of the intake air expands and the density decreases. Therefore, "the opening degree of the throttle valve 8 is increased" also becomes a state in which the flow rate of the intake air sent to the engine 107 is substantially restricted. As a result, the suction resistance is reduced and the pumping loss is reduced. In addition, ‘it was hoped that the low temperature of the intake air would increase the combustion efficiency.

45102 7 V. Description of Invention (13) 'One plus. Therefore, 'the intake air is set to an appropriate temperature (target temperature) which is determined after comparing the occurrence of pumping loss and the combustion efficiency, for example, so as to settle in a fixed range based on the target temperature. This target temperature is set by selecting the thermal expansion of the butterfly " in the thermostat 4, the shrinkage ratio, and the spring coefficients of the coil spring 41b and spring 44. By selecting the thermal expansion and yield of the wax in the thermostat 4, the 'opening and closing amount of the hot gas valve 3 corresponding to the temperature of the intake air is determined. The A mode and B mode in Fig. 4 show the above control modes, that is, the control modes during partial load operation. That is, the A mode corresponds to FIG. 3 (a), which indicates immediately after the engine is started. That is, in this state, use the control device! Close the hot air room 3 'and only set the heater to draw in air. Because of &, the temperature of the intake air is the temperature which does not reach the rising of the target fox degree. χ, the throttle valve 8 in this case needs to be set to the opening degree according to the temperature rising characteristic of the intake air, and the suction resistance is also adjusted to the opening degree. When the temperature of the intake air rises from this state, the thermostat 4 is operated to maintain the temperature of the intake air in a fixed range based on the target temperature (Fig. 3 (b)). This mode indicates the control state. In the B mode, due to the expansion of the volume of the temperature of the incoming air, the throttle valve 8 can be opened. P: In the B mode, the throttle valve 8 is opened to reduce the suction resistance, and the processing part load is operated in a state where the pumping loss is reduced. / The system is controlled during normal driving (partial load operation). The spiny state should be changed from normal to full-loaded when you want to do it, such as ㈣, rapid acceleration, etc. Under the circumstances, if the temperature of the inhaled air is still the set temperature, the load will be carried; Slope, rapid acceleration, etc. (when fully loaded). Therefore, in order to reduce this kind of defect, when the full load is on page 16, 451027 ----------- V. Description of the invention (14) When turning, 'make the negative pressure actuator 5 (refer to Figure n to open, open The throttle valve 8 sets all the intake air to the outside air. As a result, the temperature of the intake air is reduced instantaneously, which can improve combustion efficiency and become a state capable of handling full-load operation. The C mode in FIG. 4D mode indicates the above control mode. That is, the control mode at full load operation. In addition, this control mode corresponds to FIG. 3 (c). The C mode is when the engine is started at full load operation. In this case, the negative pressure actuator 5 'forced in the control device 1 is released Set the hot gas valve 3 to the outside air introduction state. As a result, 'combustion efficiency is improved and output power is prevented from decreasing. In addition, in the C mode', the throttle valve 8 is fully opened, and the suction resistance is the resistance according to the opening degree of the throttle valve 0.

The heating engine 107 (refer to FIG. 5) was suddenly heated to full-load operation in the system D mode after being sufficiently heated. In this case, the negative pressure actuator 5 is also released, and the hot gas valve 3 is strongly set to the outside air introduction state. As a result, the combustion efficiency is improved and the output power is prevented from being lowered. In this case, the throttle valve 8 is also fully opened, and the suction resistance is a resistance according to the opening degree of the throttle valve 8. In addition, in the present embodiment, when the plant is operating. However, "a specific wide range includes a specific device that requires a large output power not only based on the negative pressure in the air intake chamber 13. As a result, the" specific condition "example can be explained as a full condition" is not limited to full-load operation. status. Also, the "specific change in load state" also uses a specific load state with high accuracy depending on the load state.

Effect of the invention If: According to the present invention, the occurrence of pumping loss can be reduced during partial load operation, and it can effectively prevent a certain condition of A, such as the wheel at full load operation

Page 451 027

V. Description of the invention (15) Decrease in output. As a result, fuel consumption can be increased. Brief Description of the Drawings Fig. 1 is a diagram showing the structure of a temperature control device for intake air in this embodiment. Fig. 2 is a longitudinal sectional view showing the inside of the passage body. -囷 3 is a schematic cross-sectional view showing the household of the temperature control device for sucking air in this embodiment.囷 4 is a table showing a control mode of the temperature control method of the intake air in this embodiment. Fig. 5 is a schematic diagram showing a temperature control system having a conventional temperature control device for inhaled air. DESCRIPTION OF SYMBOLS 1 Temperature control device for inhaled air 2 Passage body 21 External air inlet 22 Heating inlet 〆 3 Hot gas valve 4 Thermostat 5 Negative pressure actuator 6 Screw line 7 Negative pressure circuit 8 ECU: Control unit (load specific Device)

Page 18

Claims (1)

_451OZ 7 VI. Scope of patent application-1. A temperature control method of the intake air 'controls the temperature of the intake air of the internal combustion engine, which is characterized by: According to the temperature of the intake air constituted by outside air, heating or the two parties The change changes the opening and closing amount of the hot air valve, controls the mixing ratio of outside air and heating to keep the temperature of the intake air in a fixed range, and controls the outside air according to the change in the negative pressure in the intake chamber and the specific load state from the engine control parameters The mixing ratio with heating, a certain condition has nothing to do with the temperature of the intake air, forcing the hot gas valve to be set to the outside air introduction state. 2. A temperature control device for inhaling air, comprising: a hot air valve 'opens and closes each inlet and outlet of heating air and outside air; and a strange thermostat' controls the amount of opening and closing of the hot air valve to inhale the outside air, heating, or both. The temperature of the air is maintained in a fixed range, which is characterized by: a negative pressure circuit that acts according to the change in the negative pressure in the air intake chamber; a solenoid coil 'opens and closes the negative pressure circuit and controls the role of the negative pressure circuit; load specific devices 'After specifying the load state from the engine control parameters, the solenoid opens and closes the load state from the load state; and the negative pressure actuator operates by using the action of the negative pressure circuit; by following the change of the negative pressure in the intake chamber Compared with controlling the mixing ratio of outside air and heating according to the specific load state of the engine control parameter, a certain condition is forced to set the hot air valve to the outside air introduction state regardless of the temperature of the intake air.