JP3610018B2 - Electrically controlled automotive muffler device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile muffler device that controls the operation of an on-off valve linked to an actuator through an electric circuit that inputs an intake air pressure and a throttle opening of an engine to improve exhaust efficiency and noise reduction. It is.
[0002]
[Prior art]
According to the prior art, a pressure actuator that operates according to the intake air pressure of the engine is attached to the outside of the exhaust pipe from an engine equipped with a turbocharger, and interlocked with an on-off valve provided in the exhaust pipe, There is disclosed an integrated automobile silencer in which a branch pipe from the exhaust pipe is formed slightly upstream from the position where the actuator is attached, and the exhaust pipe and the branch pipe are attached in an automobile silencer. That is, in this type of device, the exhaust from the engine equipped with the turbocharger is taken into the muffler from the inlet pipe branched into two systems for the purpose of controlling the operation mode of the silencing and exhaust characteristics. A silencer that uses a diaphragm actuator that has an opening / closing valve in the inlet pipe and controls the opening / closing operation of the opening / closing valve in accordance with the intake air pressure of the turbocharger, and that exhibits different noise reduction and exhaust characteristics depending on the opening / closing state. The present invention is provided as an muffler device for an internal combustion engine using an on-off valve that controls an appropriate noise reduction and exhaust operation mode. (For example, registered utility model No. 302217)
[0003]
However, when a vehicle equipped with a muffler device that controls the muffler and exhaust operation mode according to the intake air pressure is driven at high speed, only the engine speed increases and the intake air pressure does not increase so much. The on-off valve that performs the switching action is in a closed state, and naturally the exhaust pressure is higher than the open state of the on-off valve. Even if the accelerator is fully opened to open the on-off valve to lower the exhaust pressure, the on-off valve cannot be opened instantaneously because the communication pipe communicating with the surge tank has a certain length. By the time the accelerator is fully opened and the on-off valve is opened, the exhaust pressure rises and the exhaust resistance temporarily increases.
[0004]
According to the experimental value indicating the relationship between the throttle opening and the intake air pressure until the throttle opening is kept at 100% for a certain time from idling and returned to idling again, the throttle opening and the intake air pressure are not linked. I understand that. That is, according to the conventional technology, for example, even if the accelerator is fully opened to open the on-off valve to lower the exhaust pressure in the exhaust pipe by operating the diaphragm actuator, the communication pipe communicating with the surge tank as described above Has a certain length, the intake air pressure does not rise instantaneously and the on-off valve cannot be opened.
[0005]
If the operating pressure of the diaphragm type actuator is set low in order to improve such a malfunction of the muffler device, the on-off valve operates even at a low intake air pressure. In other words, the open / close valve in the closed state is operated and opened with a slight intake air pressure, and the airtightness of the exhaust pipe in which the open / close valve is provided is impaired.
[0006]
[Problems to be solved by the invention]
As described above, the actuator-controlled muffler device according to the prior art does not open the on-off valve instantaneously because only the engine speed increases and the intake air pressure does not increase even during high-speed operation. The exhaust pressure rises and the exhaust effect is significantly impaired.
[0007]
Diaphragm actuators are devices that can control the opening and closing of the on-off valve only by the intake air pressure derived through the surge tank.If the operating pressure is set low, the on-off valve will frequently open fully, There are many cases where air leaks.
[0008]
The actuator-controlled muffler device according to the prior art is a method of mounting both exhaust gas passages of an exhaust pipe with an actuator and an on-off valve and its branch pipe in the muffler in order to switch the exhaust gas passage in the muffler. As a result, the volume of the silencer increased, which hindered the downsizing of the silencer, the downsizing of the internal structure, and the weight reduction of the vehicle.
[009]
[Means for Solving the Problems]
An electrically controlled automobile muffler device according to the present invention converts a plurality of pressure modes into electric signals through pressure sensors, respectively, and sets the electric circuit so that the intake air pressure of the engine is changed into a plurality of pressure modes during engine operation. When the electric circuit detects that one of the above has been reached, the actuator is operated, and the on-off valve provided in the exhaust pipe from the engine is fully opened .
An opening mode indicating 90% or more of the throttle opening of the engine is converted into an electric signal through the engine computer device and set in the electric circuit, and the electric signal indicating the throttle opening of the engine during vehicle running is opened. When the electric circuit detects that the degree mode has been reached, the actuator is activated to fully open the on-off valve.
[0010]
Furthermore, in the electrically controlled automobile muffler device according to the present invention, one exhaust passage formed by an exhaust pipe from an engine having an on-off valve whose opening degree is controlled by the actuator , and an exhaust outlet thereof. And the other exhaust passage formed by a branch pipe from an exhaust pipe located slightly upstream of the on-off valve, a muffler joined to the branch pipe, and an exhaust outlet thereof. Is formed.
[ 0010 ]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE INVENTION The electrically controlled automobile muffler device of the present invention will be described in detail below with reference to the accompanying drawings.
[ 0011 ]
FIG. 1 is a configuration diagram of an electrically controlled automobile muffler device according to the present invention, and FIGS. 2, 3, and 4 are diagrams showing the relationship between intake air pressure, throttle opening, and on-off valve operation according to an embodiment of the present invention. FIG. 5 is a time series graph showing changes in the throttle opening and the intake air pressure.
[ 0012 ]
In FIG. 1, 1 is an on-off valve, 2 is an exhaust pipe from the engine, 3 is a branch pipe, 4 is a muffler, 5 is an exhaust outlet from the branch pipe, 6 is an in-vehicle switch, 7 is a throttle, and 8 is from the engine The exhaust discharge port of the exhaust pipe, 9 is an electric circuit, 10 is an engine computer device, 11 is a surge tank, 12 is a communication pipe to the surge tank, 13 is a pressure sensor, 14 is an actuator, and 15 is a wire.
[ 0013 ]
An electrically controlled automobile muffler device according to the present invention comprises an exhaust pipe 2 from an engine in which an on-off valve 1 is installed, and an exhaust outlet thereof, as described in claim 2 and as shown in FIG. 8, the exhaust pipe 2 from the engine, the branch pipe 3 from the exhaust pipe 2, the muffler 4 joined to the branch pipe 3, and the other exhaust gas formed by the exhaust outlet 5. The passage is composed of two independent exhaust passages.
[ 0014 ]
In the electrically controlled automobile muffler device according to the present invention, the intake air pressure of the engine led to the surge tank 11 is divided into a plurality of pressure modes and converted into electrical signals via the communication pipe 12 and the pressure sensor 13. The electric circuit 9 is set for each pressure mode.
[ 0015 ]
In one embodiment of the present invention in which the intake air pressure of the engine is divided into a plurality of pressure modes and set in the electric circuit 9, the plurality of pressure modes are “normal mode”, “silent mode”, and “sark”. Are set as three modes. In this case, in the intake air pressure, the normal mode is 0.0 kg / cm 2 or more as shown in FIG. 2, the silent mode is 0.2 kg / cm 2 or more as shown in FIG. 3, and the circuit mode is As shown in FIG. 4, it is set in each numerical value area of −660 mm Hg or more. According to this embodiment, for example, the silent mode is selected by the changeover switch 6, and the electric signal indicating the intake air pressure of the engine rises to 0.2 kg / cm 2 or more by operating the vehicle and detected by the electric circuit 9. At that time, the actuators 14 are actuated through the wires 15, respectively, and the on-off valve 1 provided in the exhaust pipe 2 from the engine is instantly fully opened.
[ 0016 ]
A change-over switch 6 that can select and switch between a plurality of pressure modes set in the electric circuit 9, that is, a normal mode, a silent mode, and a circuit mode in one embodiment of the present invention is mounted in the vehicle . .
[ 0017 ]
When an opening mode of 90% or more of the throttle 7 is set in the electric circuit 9 via the engine computer device 10, the actuator 14 immediately turns the wire when the throttle opening signal of the engine rises to 90% or more. 15 and the on-off valve 1 provided in the exhaust pipe 2 from the engine is fully opened instantaneously.
[ 0018 ]
The on-off valve 1 is always closed by a spring (not shown) incorporated in the on-off valve 1. Therefore, when the intake air pressure derived from the surge tank 11 has not reached any of the plurality of pressure modes set in the electric circuit 9, and when the throttle opening has not increased to 90 degrees or more, FIG. To FIG. 4, the on-off valve 1 remains closed, and the exhaust gas from the engine flows only through the other exhaust passage according to claim 2 , that is, from the exhaust pipe 2 to the branch pipe. 3 enters the muffler 4 where the sound is silenced and discharged from the exhaust outlet 5 into the atmosphere as a quiet exhaust gas.
[ 0019 ]
2 and 3 show the throttle signal when the opening signal of 90% or more and the intake air pressure signal reaching the silent mode and the normal mode according to the embodiment of the present invention are respectively detected as described above. The relationship between an opening degree, intake air pressure, and the operating condition of the on-off valve 1 is shown. That is, when the throttle opening is increased to 90% or more, and when the silent air pressure according to one embodiment of the present invention is selected, the engine intake air pressure is 0.2 kg / cm 2 or more, or the normal mode is selected. In this case, the on-off valve 1 is always fully opened when it rises to 0.0 kg / cm @ 2 or more.
[ 0020 ]
The intake air pressure led from the gasoline engine equipped with a turbocharger to the surge tank 11 is normally -660 mm.
Hg is about 1.5 kg / cm2. When the engine is normally operated, the condition for selecting the circuit mode, that is, the condition of “intake air pressure −660 mm Hg or more” is satisfied. As shown in FIG. 4, −660 mm at the intake air pressure by the vehicle interior changeover switch 6.
When the circuit mode of Hg or higher is selected, the on-off valve 1 is instantly fully opened as the engine operates. Accordingly, in this case, the exhaust resistance in the exhaust pipe 2 is small and the exhaust efficiency is improved, and the exhaust gas from the engine is discharged into the atmosphere from the exhaust outlet 8 while generating a sporty exhaust sound suitable for circuit driving. The
[ 0021 ]
According to one embodiment of the present invention, when the normal mode is selected with the in-vehicle changeover switch 6 and the vehicle is cruising at high speed, the engine load increases during the traveling and the intake air pressure rises from the negative pressure to 0. The electric circuit 9 is closed so that the on-off valve 1 is fully opened instantaneously when it reaches 0 kg / cm 2 or more, or when the throttle opening is raised to 90% or more by depressing the accelerator. Thus, when the on-off valve 1 is fully opened, the exhaust pressure in the exhaust pipe 2 from the engine is reduced and the exhaust efficiency is improved, and the exhaust gas from the engine generates a powerful exhaust sound corresponding to the running speed. While being discharged from the exhaust outlet 8 into the atmosphere. On the other hand, the exhaust sound having a high quietness that is diverted to the branch pipe 3 and muffled by the muffler 4 is released into the atmosphere from the exhaust outlet 5 together with the powerful exhaust sound. There is nothing.
[ 0022 ]
In addition, although driving with normal mode selected, taking into consideration the driving environment such as approaching densely populated areas, switching from normal mode to silent mode makes it possible to take in the intake air even when the vehicle is further accelerated. Until it is detected that the pressure has reached 0.2 kg / cm 2 or more, the on-off valve 1 remains closed, so that the exhaust gas from the engine flows only through the other exhaust passage according to claim 2. Then, the sound is silenced in the muffler 4 through the branch pipe 3, and is discharged from the discharge port 5 as a highly quiet exhaust sound.
[ 0023 ]
FIG. 5 is a graph showing experimental values representing the relationship between the intake air pressure (broken line) and the throttle opening (solid line) until the throttle is opened to 100% for a certain period of time from idling to return to idling. . According to this, even if the throttle opening suddenly increases, the intake air pressure rises with a delay, and even if the throttle opening suddenly decreases, the intake air pressure similarly starts to decrease with a slight delay. That is, as already described, according to FIG. 5, even if the diaphragm actuator according to the prior art is operated to open the on-off valve and the throttle is fully opened to lower the exhaust pressure in the exhaust pipe, it communicates with the surge tank. Since the communicating pipe has a certain length, the intake air pressure does not rise at the same time, and the on-off valve does not open instantaneously, indicating that the throttle opening and the intake air pressure are not linked.
[ 0024 ]
However, according to the muffler device for an electrically controlled automobile according to the present invention, even when the intake air pressure is low at a low engine load, as described above, the accelerator 7 is depressed to increase the opening of the throttle 7 to 90% or more. If the opening signal is detected, the on-off valve 1 is fully opened instantly, so even when the engine load is low and the intake air pressure remains in the low numerical range, the engine output and exhaust efficiency are instantaneous. Can be improved.
[ 0025 ]
As described above, since the electrically controlled automotive muffler device according to the present invention uses the actuator 14 that can be controlled by the electric circuit 9, the pressure signal of the pressure mode selected in advance via the changeover switch 6 and 90% When the above opening degree signal is detected, the actuator 14 immediately operates and the on-off valve 1 can be fully opened instantaneously via the wire 15. The exhaust performance and engine output efficiency have been significantly improved. In addition, since the electrically controlled automotive muffler device according to the present invention forms two independent exhaust passages, the other exhaust passage described in claim 2 is silenced by the muffler 4 and is quiet. Since the exhaust gas is discharged, an efficient silencing effect is always maintained.
[ 0026 ]
【The invention's effect】
In the electrically controlled automobile muffler device according to the present invention, the throttle opening of 90 % or more is set in the electric circuit, and the opening / closing valve interlocked with the actuator is opened when the electric signal of the throttle opening is detected. The engine output and exhaust efficiency are significantly improved because it can be done instantaneously. Further, in consideration of the driving environment, it is possible to select an operation mode that preferentially generates an environment-friendly quiet noise while closing the on-off valve and controlling the exhaust noise.
[0027]
Further, an electrically controlled automobile muffler device according to the present invention includes an exhaust pipe from an engine having an open / close valve and an exhaust discharge port formed by the exhaust pipe, a branch pipe for the exhaust pipe from the engine, and a muffler. Since it is composed of the main body and the other exhaust passage formed by its exhaust discharge port, the exhaust pipe from the engine with an open / close valve and two exhaust passages consisting of the branch pipe are taken into the muffler body Since the entire muffler device can be made smaller and lighter than the conventional integrated silencer formed, the vehicle can be lightened and an economical product can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram of an electrically controlled automobile muffler device. FIG. 2 is a correlation diagram of throttle opening and intake air pressure in a silent mode according to an embodiment. FIG. 3 is a throttle in a normal mode according to an embodiment. Correlation diagram between opening and intake air pressure [Fig. 4] Correlation diagram between throttle opening and air intake pressure in circuit mode according to one embodiment [Fig. 5] Shows changes in throttle opening and intake air pressure Time series graph

Claims (2)

The engine intake air pressure (hereinafter referred to as “multiple pressure modes”) divided into multiple numerical ranges is converted into an electrical signal via a pressure sensor and set in an electrical circuit. electric air pressure, when it has reached the one of the plurality of pressure mode is detected in said electrical circuit, the actuator is operated to fully open internally provided by opening and closing valve in the exhaust pipe from the engine In a controlled automobile muffler device,
An opening mode indicating 90% or more of the throttle opening of the engine is converted into an electric signal through the engine computer device and set in the electric circuit, and the electric signal indicating the throttle opening of the engine during vehicle running is opened. When the electric circuit detects that the power mode has been reached, the actuator is activated to open the on-off valve fully. One exhaust passage formed by an exhaust pipe from the engine in which the on-off valve is provided, an exhaust outlet of the exhaust pipe from the engine, and exhaust from the engine located slightly upstream from the on-off valve 2. The electrically controlled automobile according to claim 1, comprising a branch pipe of the pipe, a muffler joined to the branch pipe, and the other exhaust passage formed by the muffler exhaust discharge port. Muffler device.

Images