JP3467861B2 - Exhaust gas purification equipment for vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle exhaust gas purifying apparatus, and more particularly, a plurality of electrically heated catalysts are arranged in series in an exhaust passage upstream of a catalyst so that electrically heated catalysts can be applied. The present invention relates to a vehicle exhaust gas purification device that purifies exhaust gas.

[0002]

2. Description of the Related Art An internal combustion engine mounted on a vehicle is equipped with an exhaust gas purifying device for purifying harmful components in exhaust gas. The exhaust gas purifying apparatus has a catalyst provided in the exhaust passage of the internal combustion engine and a silencer provided in the exhaust passage downstream of the catalyst. The catalyst converts the harmful components in the exhaust gas into harmless ones under the predetermined gas composition and temperature conditions by the action of the catalyst substance.

Examples of the catalyst include an oxidation catalyst that oxidizes unburned components such as HC and CO and converts them into H ₂ O and CO ₂ , a reduction catalyst that decomposes NOx and converts them into N ₂ and O ₂ , and the like. There are three-way catalysts that perform both functions at the same time.

[0004]

By the way, as a conventional exhaust gas purifying apparatus for a vehicle, there is an exhaust gas reducing method when the electrically heated catalyst is deteriorated, which is disclosed in Japanese Patent Laid-Open No. 5-187226. The exhaust gas purifying catalyst heating control device disclosed in this publication includes a heating means for temporarily heating the catalyst disposed in the engine exhaust passage when the engine is started, and a degree of deterioration of the catalyst. And a control means for increasing the amount of heat given to the catalyst by the heating means when the catalyst is temporarily heated by the heating means as the degree of deterioration of the catalyst increases. No need to use wasted energy to heat the catalyst, whether new or deteriorated,
The temperature of the catalyst is rapidly raised to the activation temperature.

Further, there is one disclosed in JP-A-6-101458. The exhaust emission control device disclosed in this publication is provided with a means for detecting a failure or deterioration of the electrothermal catalyst, a secondary air supply device and a swirl control valve device are provided together, and when the electrothermal catalyst is used, the
When the failure or deterioration of the electrothermal catalyst is detected by using the secondary air supply device together, the energization of the electrothermal catalyst and the supply of the secondary air are stopped, the air-fuel ratio is set to the lean air-fuel ratio, and the swirl control valve device is used. Emissions are being reduced.

However, the electrically heated catalyst, which instantly raises the catalyst activation temperature to about 300 to 400 degrees Celsius, has a faster deterioration than the conventional non-heated type catalyst. It can be easily inferred from the position where the electrocatalyst is disposed, that is, it is disposed directly below the exhaust manifold of the internal combustion engine.

In general, the catalyst has its activation temperature shifted to a high temperature side according to deterioration (see FIG. 8), and the deterioration of the electrically heated catalyst deteriorates the purification performance at the time of cooling, resulting in particularly large travel. In the distance, there is a possibility that the target purification level of the exhaust gas may not be achieved, which is disadvantageous in practical use.

[0008]

In order to eliminate the above-mentioned inconvenience, the present invention provides a catalyst in the exhaust passage of an internal combustion engine mounted on a vehicle, and an exhaust passage upstream of the catalyst. In an exhaust gas purifying apparatus for a vehicle, which has a control means for applying a plurality of electrically heated catalysts arranged in series and performing control so as to purify exhaust gas,
Depending on the deterioration state of the electrically heated catalyst, among a plurality of electrically heated catalysts, only the first electrically heated catalyst on the upstream side is used and the second electrically heated catalyst on the downstream side is used. The control means is additionally provided with a function of selecting whether to use only the catalyst or to use both of the electrically heated catalysts.

Further, a catalyst is provided in the exhaust passage of an internal combustion engine mounted on a vehicle, and a plurality of electrically heated catalysts arranged in series are applied to the exhaust passage upstream of the catalyst to exhaust gas. In the exhaust gas purifying apparatus for a vehicle, which has a control means for controlling so as to achieve the purification of the first heating, among the plurality of electric heating type catalysts provided according to the deterioration state of the electric heating type catalyst, the first electric power on the upstream side. A function of selecting whether to use only the heating catalyst, a case of using only the second electrically heating catalyst on the downstream side, or a case of using both of the electrically heating catalysts; and the electrically heating catalyst The function of changing the amount of electric power applied to the electrically heated catalyst selected by the selected function according to the deterioration state of is added to the control means.

Further, a catalyst is provided in the exhaust passage of the internal combustion engine mounted on the vehicle, and a plurality of electrically heated catalysts arranged in series are applied to the exhaust passage on the upstream side of the catalyst to exhaust gas. In an exhaust gas purifying apparatus for a vehicle, which has a control means for controlling to purify the above, a first electrically heated catalyst, which is located upstream of a plurality of electrically heated catalysts provided according to the traveling distance of the vehicle. The control means is provided with a function of selecting whether to use only the second electrically heated catalyst on the downstream side or to use both of the electrically heated catalysts. It is characterized by

[0011]

As a result of the invention as described above, when the internal combustion engine is driven, the first electric device located upstream of the plurality of electric heating type catalysts provided by the control means according to the deterioration state of the electric heating type catalyst. In the case of using only the heating catalyst, in the case of using only the second electric heating catalyst on the downstream side,
The case where both electrically heated catalysts are used is selected and used, and good exhaust gas purification performance is maintained for a long time.

Further, when the internal combustion engine is driven, only the first electrically heated catalyst on the upstream side is used among the plurality of electrically heated catalysts provided by the control means according to the deterioration state of the electrically heated catalyst. Depending on the state of deterioration of the electrically heated catalyst, while selectively using the second electrically heated catalyst on the downstream side and the case of using both electrically heated catalysts. , The amount of electric power applied to the electrically heated catalyst selected by the function to be selected is changed,
Good exhaust gas purification performance is maintained for a long time.

Further, when the internal combustion engine is driven, among the plurality of electrically heated catalysts provided by the control means, only the first electrically heated catalyst on the upstream side is used according to the traveling distance of the vehicle. The case where only the second electrically heated catalyst on the downstream side is used and the case where both electrically heated catalysts are used are selected and used, and good exhaust gas purification performance is maintained for a long time.

[0014]

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

1 and 2 show a first embodiment of the present invention. In FIG. 2, 2 is an exhaust gas purifying apparatus for a vehicle, 4 is an internal combustion engine mounted on a vehicle (not shown), 6 is an exhaust manifold, and 8 is an exhaust passage.

A non-heating type catalyst 10 is provided in the exhaust passage 8 of the internal combustion engine 4, and the exhaust passage 8 upstream of the catalyst 10, that is, the exhaust manifold 6 is provided.
A plurality of, for example, two first and second electrically heated catalysts (EHC) 12, 14 are arranged in series from immediately below.

These first and second electrically heated catalysts 12, 1
4 is connected to the catalyst control means 16, a battery 18 and a control means 20 are connected to the catalyst control means 16, respectively, and a first control signal is sent from the control means 20 via the catalyst control means 16. Second electrically heated catalyst 12, 1
4 is applied to heat the first and second electrically heated catalysts 12 and 14 to purify the exhaust gas.

The first electrically heated catalyst 1 located upstream of the plurality of first and second electrically heated catalysts 12, 14 provided in the control means 20 in accordance with the traveling distance of the vehicle.
A function of selectively using the case where only 2 is used, the case where only the second electrically heated catalyst 14 on the downstream side is used, and the case where both the first and second electrically heated catalysts 12 and 14 are used Is added.

More specifically, a running distance detecting means 22 for detecting the running distance of a vehicle (not shown) is connected to the control means 20, and a detection signal from the running distance detecting means 22 is input to the first and the second. The second electrically heated catalysts 12 and 14 are controlled to be selectively used.

Further, the relationship between the traveling distance of the vehicle and the state of selective use of the first and second electrically heated catalysts 12 and 14 is shown in FIG.
As shown in, the traveling distance is divided into, for example, the following three areas. A: 0 miles or more and less than 40,000 miles B: 40000 miles or more but less than 60,000 miles C: 60,000 miles or more ((1 mile is about 1.6 km)

In each of the areas A to C, the first,
The second electrically heated catalyst 12, 14 is selectively used. That is, in the region A, only the first electrically heated catalyst 12 on the upstream side, which is the upstream side, is applied and used, and in the region B, only the second electrically heated catalyst 14 on the downstream side, which is the downstream side, is applied. In the C region, both the first and second electrically heated catalysts 12 and 14 are applied and set to be used.

Next, the operation will be described.

The mileage of the vehicle is 0 miles or more to 4000
In the area A of less than 0 mile, only the first electrically heated catalyst 12 on the upstream side is applied and the first electrically heated catalyst 12 is used.

In the region B where the mileage of the vehicle is 40,000 miles or more and less than 60,000 miles, only the second electrically heated catalyst 14 on the rear side which is the downstream side is applied,
The second electrically heated catalyst 14 is used.

Further, in the C range where the vehicle travels over 60,000 miles, both the first and second electrically heated catalysts 12 and 14 are applied, and the first and second electrically heated catalysts 12 and 14 are applied. Are used respectively.

As a result, of the plurality of first and second electrically heated catalysts 12, 14 provided by the control means 20 in accordance with the traveling distance of the vehicle, the first electrically heated catalyst 12 on the upstream side is provided. When using only the second one on the downstream side
The case where only the electrically heated catalyst 14 is used and the case where both the first and second electrically heated catalysts 12 and 14 are used can be selected and used, and excellent exhaust gas purification performance can be obtained for a long time. It can be maintained and is practically advantageous, and power consumption is effectively distributed, which is economically advantageous.

By dividing the traveling distance into three areas A to C and selecting and using two first and second electrically heated catalysts 12 and 14 in accordance with the areas A to C,
The control of the first and second electrically heated catalysts 12 and 14 can be simplified, the structure is not complicated, the production is easy, and the cost can be reduced, and the first and second electrically heated catalysts are also available. The power consumption applied to 12 and 14 can be effectively distributed, and unnecessary power consumption can be avoided, which is economically advantageous.

FIGS. 3 and 4 show a second embodiment of the present invention. In the second embodiment, the portions having the same functions as those of the first embodiment will be described with the same reference numerals.

A feature of the second embodiment is that a deterioration detecting means 30 for detecting the deterioration state of the electrically heated catalyst is provided, and a signal from the deterioration detecting means 30 is used to, for example, two first and first 2 The electrically heated catalysts 12 and 14 are selectively used.

That is, as shown in FIG. 4, an oxygen sensor 32, which is an O ₂ sensor, is used as the deterioration detecting means 30, and the oxygen sensor 32 is placed at the front and rear positions of the first and second electrically heated catalysts 12, 14. Oxygen sensor 32 with a total of 3
A detection signal from the first and second electrically heated catalysts 12 and 1 based on the output waveform of the oxygen sensor 32.
4, the deterioration state is detected, and the first and second electrically heated catalysts 1
According to the deterioration states of 2 and 14, a plurality of first,
Of the second electrically heated catalysts 12 and 14, the first on the upstream side
The case where only the electrically heated catalyst 12 is used, the case where only the second electrically heated catalyst 14 on the downstream side is used, and the case where both the first and second electrically heated catalysts 12 and 14 are used are used. It is the one that is selected and used.

Reference numeral 34 is a temperature sensor for detecting the temperature of the first and second electrically heated catalysts 12, 14.

The operation will be described with reference to the control flowchart of FIG.

When the program for judging deterioration of the electrically heated catalyst (EHC) is started (100), the outputs from the oxygen sensor 32 and the temperature sensor 34, which are O ₂ sensors, are read (102), and the first electric heating which is the front side is read. A determination (104) is made as to whether the equation catalyst 12 has deteriorated.

If the determination (104) is YES, the process proceeds to the determination (106) as to whether or not the second electrically heated catalyst 14 on the rear side is deteriorated, and the determination (10)
If 4) is NO, the ignition switch (IG)
After turning off the switch (108), the ignition switch (IG) is turned on again (110) to energize (112) to apply only the first electrically heated catalyst 12, which is the front side, to the end (126). Move.

When the above-mentioned judgment (106) is NO, that is, when the rear side second electrically heated catalyst 14 is not deteriorated, after the ignition switch (IG) is turned off (114), Ignition switch (I
G) is turned on (116), the second electrically heated catalyst 14 on the rear side is energized so as to be applied (118), and the end (126) is entered.

Further, if the above-mentioned judgment (106) is YES, that is, if the second electrically heated catalyst 14 on the rear side is deteriorated, after turning off the ignition switch (IG) (120), Ignition switch (I
G) is turned on (122), both the first and second electrically heated catalysts 12 and 14 on the front and rear sides are energized (124) and applied to the end (126).

As a result, the deterioration detecting means 30 can reliably detect the deterioration state of the electrically heated catalyst, and the electrically heated catalyst can be selectively used according to the deteriorated state of the electrically heated catalyst.

Further, since the deterioration state of the first and second electrically heated catalysts 12 and 14 can be detected by the output waveform from the oxygen sensor 32, the deterioration states of the first and second electrically heated catalysts 12 and 14 can be detected. Accordingly, the first and second electrically heated catalysts 12 and 14 can be reliably selected and used, and the control reliability can be improved.

FIG. 5 shows a third embodiment of the present invention.

The feature of the third embodiment is that when the amount of electric power applied to the electrically heated catalyst is changed by the control means in accordance with the deterioration state of the electrically heated catalyst, one electrically heated catalyst is used. The point is that the amount of electric power applied to the other electrically heated catalyst is increased while the amount of electric power applied to the other is increased.

That is, as in the first and second embodiments described above, two first and second electrically heated catalysts 12, 14 are used.
Are arranged in series, and the first and second electrically heated catalysts 12, 14 are arranged.
Of the plurality of first and second electrically heated catalysts 12 and 14 which are provided depending on the deterioration state, the case where only the first electrically heated catalyst 12 on the upstream side is used and the first electrically heated catalyst 12 on the downstream side is used. 2 The case of using only the electrically heated catalyst 14 and the first of both
The first electrically heated catalyst 1 and the second electrically heated catalyst 12 and 14 are selectively used.
The amount of electric power applied to the first and second electrically heated catalysts 12, 14 and the ratio of the application time, for example, the amount of electric power, are changed according to the deterioration state of Nos. 2 and 14, for example, the traveling distance of the vehicle.

Then, the amount of electric power applied to the first and second electrically heated catalysts 12 and 14 can be changed by the control means according to the traveling distance of the vehicle. That is, as shown in FIG. 5, for example, along with an increase in travel distance, first, the electric power amount of the first predetermined value applied to the first electrically heated catalyst 12 on the one front side is gradually increased to the second predetermined value, When gradually decreasing the amount of power applied to the first electrically heated catalyst 12 from the second predetermined value to 0 (zero), the amount of power applied to the second electrically heated catalyst 14 on the other rear side is set to 0. Second from (zero)
It can be gradually increased to a predetermined value, and the switching from the first electrically heated catalyst 12 to the second electrically heated catalyst 14 can be smoothly performed without reducing the total electric energy.
Fluctuations in exhaust gas purification performance are small, which is practically advantageous.

Also, the first and second electrically heated catalysts 12, 1
Since the deterioration determination of No. 4 is performed during traveling according to the traveling distance, the determination result can be reflected at the next use of the first and second electrically heated catalysts 12 and 14, for example, at the next cold start.

FIG. 6 shows a fourth embodiment of the present invention.

The feature of the fourth embodiment is that when the amount of electric power applied to the electrically heated catalyst is changed by the control means in accordance with the deterioration state of the electrically heated catalyst, the first and second electricity are used. The point is that the switching modes of the heating catalysts 12 and 14 are diversified, and fine switching control is instantaneously performed.

That is, like the first and second embodiments described above, two first and second electrically heated catalysts 12 and 14 are arranged in series, and the first and second electrically heated catalysts 12 and 14 are arranged according to the traveling distance of the vehicle. , The amount of electric power applied to the second electrically heated catalysts 12 and 14 is changed.

Then, the amount of electric power applied to the first and second electrically heated catalysts 12 and 14 can be changed by the control means according to the traveling distance of the vehicle. That is, as shown in FIG. 6, for example, the amount of electric power of the first predetermined value applied to the first electric heating type catalyst 12 on the front side is gradually increased to the second predetermined value as the traveling distance increases, and the first electric heating is performed. Immediately before the amount of electric power applied to the electrocatalyst 12 is changed from the second predetermined value to 0 (zero), the first electric power applied to the second electrically heated catalyst 14 on the rear side.
It is possible to set a predetermined amount of electric power and
The amount of electric power is gradually increased from a predetermined value to a second predetermined value, and thereafter, the electric energy is controlled to be switched between the second predetermined value and 0 (zero) so that the first and second electrically heated catalysts 12 and 14 are alternately used. be able to.

As a result, the first and second electrically heated catalysts 1
By changing the setting for changing the amount of electric power applied to Nos. 2 and 14, the switching modes of the first and second electrically heated catalysts 12 and 14 can be made versatile, and fine switching control can be instantaneously performed. The versatility can be greatly enhanced.

Further, as in the case of the above-mentioned third embodiment, the deterioration determination of the first and second electrically heated catalysts 12 and 14 is carried out at the time of traveling by the traveling distance, so that the next
When the second electrically heated catalysts 12 and 14 are used, for example, the determination result can be reflected at the time of next cold engine start.

FIG. 7 shows a fifth embodiment of the present invention.

The feature of the fifth embodiment is that the setting is performed when there is an electrical margin.

That is, the first and second electrically heated catalysts 1
2 and 14 each have a dedicated battery (not shown), there is a margin in terms of electric power, and it is applied to both the first and second electrically heated catalysts 12 and 14 at the time of cold start. Then, according to the degree of deterioration, for example, when the deterioration state of the first electrically heated catalyst 12 on the front side is in progress,
As indicated by the broken line, the amount of electric power applied to the first electrically heated catalyst 12 on the front side is increased.

By the way, the first and second electrically heated catalysts 1
It is possible to increase the amount of electric power of the one whose deterioration is progressing in accordance with the deterioration states of Nos. 2 and 14 and to make it possible to obtain the catalyst activation temperature increased by the deterioration, and to secure good exhaust gas purification performance. Therefore, it is practically advantageous.

The present invention is not limited to the above-mentioned first to fifth embodiments, and various application modifications are possible.

For example, in the second embodiment of the present invention, an oxygen sensor 32 which is an O ₂ sensor is used as the deterioration detecting means 30, and the oxygen sensor 32 is used as the first and second oxygen sensors.
A total of three are arranged in front and behind the electrically heated catalysts 12 and 14,
The detection signal from the oxygen sensor 32 is input to the control means 20, and the deterioration state of the first and second electrically heated catalysts 12 and 14 is detected from the output waveform of the oxygen sensor 32.
Instead of the oxygen sensor 32, as shown in FIG. 4, the oxygen sensor 32 is provided in the first and second electrically heated catalysts 12 and 14 to detect the temperatures of the first and second electrically heated catalysts 12 and 14, respectively. A temperature sensor 34 may also be used. That is, the temperature of the first and second electrically heated catalysts 12, 14 during activation is monitored by the detection signal from the temperature sensor 34, and the deterioration state of the first, second electrically heated catalysts 12, 14 is detected. According to the deterioration state of the first and second electrically heated catalysts 12 and 14, the first and second electrically heated catalysts 12 and 14 can be provided.
Can be selectively used.

[0056]

As described in detail above, according to the present invention, a catalyst is provided in the exhaust passage of an internal combustion engine mounted on a vehicle, and a plurality of catalysts are arranged in series in the exhaust passage upstream of the catalyst. In an exhaust gas purifying apparatus for a vehicle, which has control means for applying an electrically heated catalyst to control exhaust gas purification, a plurality of electrically heated catalysts are provided according to the deterioration state of the electrically heated catalyst. Of the catalysts, only the first electrically heated catalyst on the upstream side is used,
Since the control means is provided with a function of selecting whether to use only the second electrically heated catalyst on the downstream side or to use both electrically heated catalysts, the electrically heated catalyst is controlled by the controller. It is possible to select and use an electrically heated catalyst according to the deterioration state of, and it is possible to maintain good exhaust gas purification performance for a long time, which is practically advantageous, and power consumption is effectively distributed, which is economical. It is also advantageous. Also,
Since the control means can select and use the electrically heated catalyst according to the traveling distance, good exhaust gas purification performance can be maintained for a long time. Furthermore,
By dividing the mileage into multiple regions and selecting and using multiple electrically heated catalysts for each region, the control of the electrically heated catalyst can be simplified and the configuration becomes complicated. In addition, it is easy to manufacture, the cost can be reduced, the power consumption applied to the electrically heated catalyst can be effectively distributed, and unnecessary power consumption can be avoided, which is economically advantageous.

Further, a catalyst is provided in the exhaust passage of the internal combustion engine mounted on the vehicle, and a plurality of electrically heated catalysts arranged in series are applied to the exhaust passage upstream of this catalyst to apply exhaust gas. In an exhaust gas purifying apparatus for a vehicle, which has a control means for controlling so as to purify the above, a first electric heating located upstream of a plurality of electric heating type catalysts provided according to a deterioration state of the electric heating type catalyst. Of using only the electrocatalyst, using only the second electrically heated catalyst on the downstream side, and using both electrically heated catalysts, and the deterioration state of the electrically heated catalyst According to the above, since a function for changing the amount of electric power applied to the electrically heated catalyst selected by the function to be selected is added to the control means, the case where both electrically heated catalysts are used is selected. And then use In addition, the amount of electric power applied to the electrically heated catalyst selected by the selected function can be changed according to the deterioration state of the electrically heated catalyst, and good exhaust gas purification performance can be maintained for a long time. There is.

Further, a catalyst is provided in the exhaust passage of the internal combustion engine mounted on the vehicle, and a plurality of electrically heated catalysts arranged in series are applied to the exhaust passage upstream of the catalyst to exhaust gas. In an exhaust gas purifying apparatus for a vehicle, which has a control means for controlling so as to purify the exhaust gas, only a first electrically heated catalyst on the upstream side of the plurality of electrically heated catalysts provided according to the traveling distance of the vehicle. The control means is additionally provided with a function of selecting whether to use the second electrically heated catalyst on the downstream side or to use both electrically heated catalysts. By the means, the amount of electric power applied to the electrically heated catalyst can be changed according to the mileage of the vehicle, and it becomes possible to smoothly switch the electrically heated catalyst without reducing the total amount of electric power, Elimination Variations in the purification performance of the gas is small, and the well as a practically advantageous, the power consumption is effectively distributed, economically advantageous. In addition, since the deterioration determination of the electrically heated catalyst is performed during traveling according to the traveling distance, the determination result can be reflected when the electrically heated catalyst is used next time, for example, when the cold start is performed next time.

[Brief description of drawings]

FIG. 1 is a diagram showing a switching use state of an electrically heated catalyst according to a first embodiment of the present invention at a traveling distance.

FIG. 2 is a schematic configuration diagram of a vehicle exhaust gas purification device.

FIG. 3 is a control flowchart of an exhaust gas purifying apparatus for a vehicle showing a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a vehicle exhaust gas purification device.

FIG. 5 is a diagram showing a switching use state of the electrically heated catalyst in the relationship between the amount of electric power and the traveling distance according to the third embodiment of the present invention.

FIG. 6 is a diagram showing a switching use state of an electrically heated catalyst according to a relationship between electric energy and traveling distance according to a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a switching use state of the electrically heated catalyst in the relationship between the amount of electric power and the traveling distance according to the fifth embodiment of the present invention.

FIG. 8 is a diagram showing a relationship between a catalyst activation temperature and a traveling distance according to a conventional technique of the present invention.

[Explanation of symbols]

2 Vehicle exhaust gas purification device 4 Internal combustion engine 6 Exhaust manifold 8 exhaust passage 10 Unheated type catalyst 12 First electrically heated catalyst 14 Second electrically heated catalyst 16 Catalyst control means 18 battery 20 Control means 22 mileage detection means

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) F01N 3/20 F01N 3/24 F01N 9/00

Claims (4)

(57) [Claims] With 1. A provision of the catalyst in the middle exhaust passage of an internal combustion engine mounted on a vehicle, the exhaust gas by applying an electrically heated catalyst plurality arranged in series in the exhaust passage upstream of the catalyst In the exhaust gas purifying apparatus for a vehicle, which has a control means for controlling so as to achieve the purification of the first heating , among the plurality of electric heating type catalysts provided according to the deterioration state of the electric heating type catalyst , the first electric power on the upstream side. Uses heated catalyst only
And when using only the second electrically heated catalyst on the downstream side
When used, and both of the above electrically heated catalysts are used
An exhaust gas purifying apparatus for a vehicle, wherein the control means is provided with a function of selecting a case and a case . 2. A provided with a catalyst in the middle exhaust passage of an internal combustion engine mounted on a vehicle, by applying an electrically heated catalyst plurality arranged in series in the exhaust passage upstream of the catalyst exhaust gas in the exhaust gas purifying device for a vehicle having a control means for controlling to fulfill the purification, the electrical heating
Electric heating provided in plural according to the deterioration state of the catalyst
Only the first electrically heated catalyst on the upstream side of the
And when using only the second electrically heated catalyst on the downstream side
When used, and both of the above electrically heated catalysts are used
If the function of selecting and, in accordance with the deterioration state of said electrically heated catalyst, and a function of changing the amount of power applied to the electrically heated catalyst which is selected by the function of the selected added to the control means An exhaust gas purifying device for a vehicle, which is characterized by being provided. 3. Exhaust passage of internal combustion engine mounted on vehicle
A catalyst is installed inside and the exhaust gas on the upstream side of this catalyst is
Apply a plurality of electrically heated catalysts arranged in series in the air passage
Control means to control the exhaust gas purification
In an exhaust gas purifying device for a vehicle having the
Depending on the distance traveled, multiple electrically heated catalysts
Where only the first electrically heated catalyst on the upstream side is used
And only the second electrically heated catalyst on the downstream side is used.
And the case of using both of the above electrically heated catalysts.
The feature is that the function to select is added to the control means.
Exhaust gas purification device for vehicles to be collected. 4. The plurality of electrically heated catalysts provided
Each has its own battery
The exhaust gas purifying apparatus for a vehicle according to claim 1.