CN115450735A - A kind of GPF active regeneration control device and method for passenger car - Google Patents

Abstract

The invention belongs to the technical field of gasoline engine particle traps, and particularly relates to a GPF active regeneration control device and method for a passenger vehicle; the engine air inlet is communicated with an air filter outlet, the engine exhaust port is communicated with a three-way catalyst inlet, the three-way catalyst outlet is communicated with a GPF air inlet through a GPF air inlet pipe, a GPF air outlet is connected with a GPF exhaust pipe, a differential pressure sensor is arranged between the GPF air inlet end and the GPF air outlet end, one end of a secondary air pump is communicated with the air filter, the other end of the secondary air pump is communicated with the GPF air inlet pipe, and a catalyst is coated in the hole wall of the GPF; the invention utilizes the secondary air pump connected with the vehicle and the GPF to realize secondary air supplement to the GPF, and realizes heating of the GPF by matching with the working condition of enriching the mixed gas, thereby realizing the active regeneration of the GPF under the condition of not influencing the dynamic property, realizing the regeneration under the condition of low temperature, and solving the problem of vehicle regeneration of the gasoline particle catcher.

Description

A kind of GPF active regeneration control device and method for passenger car

technical field

The invention belongs to the technical field of gasoline engine particle traps, and in particular relates to a GPF active regeneration control device and method for passenger cars.

Background technique

With the increasingly stringent requirements for particulate matter in motor vehicle emission regulations, especially the implementation of the National VI emission regulations, many engines must be equipped with gasoline engine particulate filters (Gasoline Particulate Filter, GPF for short). A GPF is a ceramic filter installed in the exhaust system of a gasoline engine, which traps particulate emissions before they enter the atmosphere. The application of GPF is more and more extensive, and its capture efficiency is generally above 90%. GPF can capture more than 90% of the particles in automobile exhaust. The captured particles are attached to the collector. Because the particles captured by GPF need Only high temperature can be oxidized. Without the stimulation of external conditions, it is difficult to eliminate particulate matter in the exhaust system. With the continuous accumulation of particulate matter, the exhaust resistance of the engine will gradually increase. When the GPF is severely blocked , the back pressure of the engine exhaust system will rise sharply, and the engine performance will also deteriorate. Therefore, it is necessary to burn off the particulate matter in the GPF in time, that is, to regenerate. At present, there are two commonly used GPF regeneration methods: one is passive regeneration, when the vehicle is running at high speed or under high load, the exhaust temperature is high, and the particulate matter in the GPF is directly burned; the other is active regeneration, and active regeneration There are also two types, one is to regenerate the GPF by delaying the ignition angle and increasing the exhaust temperature; the second is to regenerate the GPF by reminding the user to collect fuel after driving at high speed.

In the case of active regeneration, the first method cannot reach the regeneration temperature at low temperature, and cannot actively regenerate. If the ignition delay angle is further increased, there will be insufficient power, which will easily cause users to complain; the second method requires the cooperation of users. Complete active regeneration, it is easy to cause user complaints. For models with GPF arranged under the chassis, the exhaust temperature is lower than that of the tightly coupled GPF, and the problem that the above two methods cannot be regenerated is prone to occur at low temperatures.

Contents of the invention

In order to overcome the above problems, the present invention provides a GPF active regeneration control device and method for passenger cars, which uses the secondary air pump connected to the GPF to realize the secondary air supply to the GPF, and cooperates with the enrichment of the mixed gas to realize the regeneration of the GPF. The heating can realize the active regeneration of GPF without affecting the power performance, and the regeneration can also be realized under low temperature conditions, which solves the regeneration problem of vehicles equipped with gasoline particulate filters.

A passenger car GPF regeneration device, including an air filter 1, an engine 2, a three-way catalytic converter 3, a GPF 5, a differential pressure sensor 6, and a secondary air pump 8, wherein the air inlet of the engine 2 is connected to the air filter The outlet of the device 1 is connected, the exhaust port of the engine 2 is connected with the inlet of the three-way catalytic converter 3, the outlet of the three-way catalytic converter 3 is connected with the air inlet of the GPF 5 through the GPF intake pipe 4, and the gas outlet of the GPF 5 is connected with the GPF The exhaust pipe 7 is connected, and a differential pressure sensor 6 is provided between the inlet end and the outlet end of the GPF 5, and one end of the secondary air pump 8 is connected with the air filter 1, and the other end is connected with the GPF inlet pipe 4, and the GPF The pore wall of 5 is coated with catalyst.

The inlet end of the GPF 5 is connected with the GPF inlet pipe 4 and one end of the differential pressure sensor 6 respectively, and the outlet end of the GPF 5 is connected with the GPF exhaust pipe 7 and the other end of the differential pressure sensor 6 respectively.

The catalyst is a three-way catalyst.

A GPF active regeneration control method for a passenger car, comprising the following content:

Step 1, the pressure difference sensor 6 and the secondary air pump 8 are respectively connected to the engine control unit, so that the engine control unit can receive the detection signal of the pressure difference sensor 6, and can control the opening and closing of the secondary air pump 8;

Step 2, the engine control unit collects vehicle operating condition information, including vehicle speed, accelerator opening, engine speed, torque and detection signals of differential pressure sensor 6, and calculates the current carbon load in GPF5 through the GPF particulate matter module in the engine control unit;

Step 3: Compare the carbon load of GPF5 with the first carbon load threshold set by the calibration. If it does not exceed the first carbon load threshold, regeneration is not required. If it exceeds the first carbon load threshold, regeneration is required. ;

Step 4: The GPF regeneration condition confirmation module in the engine control unit determines whether the regeneration condition set by the calibration is satisfied according to the ambient temperature, engine speed, engine torque, vehicle speed and air-fuel ratio parameters. If the regeneration condition is not satisfied, the secondary air is not activated. Pump 8, if the regeneration condition is satisfied, the secondary air calculation module in the engine control unit calculates the required secondary air intake volume and turns on the secondary air pump 8 to pass the air filtered by the air filter 1 through the secondary air The pump 8 passes into the GPF intake pipe 4, and mixes with the exhaust gas in the GPF intake pipe 4 and enters the catalyst-coated GPF5. The unburned HC and CO react with the oxygen of the air under the action of the catalyst and release a large amount of heat to make the GPF5 The temperature is raised to the combustible temperature of carbon particles, so that the carbon particles are burned, thereby realizing the active regeneration of GPF5;

Step 5: During the active regeneration of GPF5, the GPF temperature module in the engine control unit calculates the exhaust gas temperature in GPF5 based on the carbon load, unburned pollutants, and pumped air volume, and compares the exhaust temperature with the GPF Compare the tolerance temperature to confirm whether the GPF is overheated;

Step 6, if the temperature is overheated, the engine control unit controls the secondary air pump 8 to shut down, and if the temperature is not overheated, the active regeneration will continue until the current carbon load in GPF5 calculated by the GPF particulate matter module in the engine control unit is lower than the first Carbon load threshold, at this time the engine control unit controls the secondary air pump 8 to shut down, and the active regeneration ends.

Beneficial effects of the present invention:

Compared with the existing active regeneration method by delaying the ignition angle of the engine or by reminding the user to collect fuel after high-speed driving, this method uses the secondary air pump to supplement the secondary air to the gasoline particle filter, and cooperates with the enrichment process of the mixture This technical solution can solve the problem of regeneration at low temperature and low speed, which is difficult to be solved by the above two kinds of regeneration.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the content of the embodiment of the present invention and these drawings without any creative effort.

Fig. 1 is a structural schematic diagram of the regeneration device of the present invention.

Fig. 2 is a flow chart of the method of the present invention.

In the figure: 1. Air filter, 2. Engine, 3. Three-way catalytic converter, 4. GPF intake pipe, 5. GPF, 6. Differential pressure sensor, 7. GPF exhaust pipe, 8. Secondary air pump .

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "under" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this embodiment, the terms "up", "down", "left", "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations. It is not intended to indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

Example 1

As shown in Figure 1, a GPF regeneration device for a passenger car includes an air filter 1, an engine 2, a three-way catalytic converter 3, a GPF 5, a differential pressure sensor 6, and a secondary air pump 8, wherein the intake of the engine 2 The air port communicates with the outlet of the air filter 1, the exhaust port of the engine 2 communicates with the inlet of the three-way catalytic converter 3, the outlet of the three-way catalytic converter 3 communicates with the air intake of the GPF 5 through the GPF intake pipe 4, and the GPF The air outlet of 5 is connected with the GPF exhaust pipe 7, and a differential pressure sensor 6 is arranged between the inlet end and the air outlet end of the GPF 5, and one end of the secondary air pump 8 is communicated with the air filter 1, and the other end is connected with the GPF. The gas pipe 4 is connected, and the pore wall of the GPF 5 is coated with a catalyst.

The inlet end of the GPF 5 is connected with the GPF inlet pipe 4 and one end of the differential pressure sensor 6 respectively, and the outlet end of the GPF 5 is connected with the GPF exhaust pipe 7 and the other end of the differential pressure sensor 6 respectively.

The catalyst is a three-way catalyst. Such as precious metals.

As shown in Figure 2, a GPF active regeneration control method for a passenger car includes the following content:

Step 1, the pressure difference sensor 6 and the secondary air pump 8 are respectively connected to the engine control unit, so that the engine control unit can receive the detection signal of the pressure difference sensor 6, and can control the opening and closing of the secondary air pump 8;

Step 2, the engine control unit collects vehicle operating condition information, including vehicle speed, accelerator opening, engine speed, torque and detection signals of differential pressure sensor 6, and calculates the current carbon load in GPF5 through the GPF particulate matter module in the engine control unit;

Step 3: Compare the carbon load of GPF5 with the first carbon load threshold set by the calibration. If it does not exceed the first carbon load threshold, regeneration is not required. If it exceeds the first carbon load threshold, regeneration is required. ;

Step 4: The GPF regeneration condition confirmation module in the engine control unit determines whether the regeneration condition set by the calibration is satisfied according to the ambient temperature, engine speed, engine torque, vehicle speed and air-fuel ratio parameters. If the regeneration condition is not satisfied, the secondary air is not activated. Pump 8, if the regeneration condition is satisfied, the secondary air calculation module in the engine control unit calculates the required secondary air intake volume and turns on the secondary air pump 8 to pass the air filtered by the air filter 1 through the secondary air The pump 8 passes into the GPF intake pipe 4, and mixes with the exhaust gas in the GPF intake pipe 4 and enters the catalyst-coated GPF5. The unburned HC and CO react with the oxygen of the air quickly under the action of the catalyst and release a large amount of heat to make the GPF5 The internal temperature rises rapidly to the combustible temperature of carbon particles, so that the carbon particles burn, thereby realizing the active regeneration of GPF5;

Step 5: During the active regeneration of GPF5, the GPF temperature module in the engine control unit calculates the exhaust gas temperature in GPF5 based on the carbon load, unburned pollutants, and pumped air volume, and compares the exhaust temperature with the GPF Compare the tolerance temperature to confirm whether the GPF is overheated;

Step 6, if the temperature is overheated, the engine control unit controls the secondary air pump 8 to shut down, and if the temperature is not overheated, the active regeneration will continue until the current carbon load in GPF5 calculated by the GPF particulate matter module in the engine control unit is lower than the first Carbon load threshold, at this time the engine control unit controls the secondary air pump 8 to shut down, and the active regeneration ends.

Example 2

A passenger car GPF regeneration device, comprising an air filter 1, an engine 2, a three-way catalytic converter 3, a GPF 5, a differential pressure sensor 6, and a secondary air pump 8; the vehicle needs to be equipped with a secondary air pump 8, Connect it to the GPF intake pipe 4, and supplement air to GPF5 as needed; GPF5 is coated with a catalyst; when the GPF active regeneration method is regenerated, the secondary air pump needs to be turned on to supplement air to the GPF to regenerate the GPF.

The engine control unit has a GPF carbon load module. Before GPF regeneration, it is necessary to calculate the GPF carbon load, and compare it with the first carbon load threshold set by the calibration to confirm whether it is regenerated. The engine control unit has a GPF regeneration condition confirmation module, which determines whether the regeneration conditions set by the calibration are met according to the ambient temperature, engine speed, engine torque, vehicle speed and air-fuel ratio parameters.

The engine control unit has a GPF exhaust temperature module, and the GPF must check whether the GPF temperature exceeds the standard during the active regeneration process.

The specific method is as follows:

When the engine control unit collects vehicle operating condition information, including vehicle speed, accelerator opening, engine speed, torque and the detection signal of the differential pressure sensor 6, the current carbon load in GPF5 is calculated by the GPF particle module in the engine control unit, and the GPF5 Compare the carbon load with the first carbon load threshold set by the calibration to determine whether regeneration is required. If the first carbon load threshold is not exceeded, regeneration is not required. If it exceeds the first carbon load threshold, it will enter regeneration. Program, the GPF regeneration condition confirmation module in the engine control unit determines whether the regeneration conditions set by the calibration are met according to the ambient temperature, engine speed, engine torque, vehicle speed and air-fuel ratio parameters. If the regeneration conditions are not met, the secondary air pump will not be started 8. Wait for the condition to be met. If the regeneration condition is met, the secondary air calculation module in the engine control unit calculates the required secondary air intake volume and starts the secondary air pump 8 to pass the air filtered by the air filter 1 into the In the GPF intake pipe 4, the exhaust gas mixed with the GPF intake pipe 4 enters the catalyst-coated GPF5, and the unburned HC and CO react with the oxygen of the air quickly under the action of the catalyst to release a large amount of heat, which makes the temperature in the GPF5 rise rapidly To the combustible temperature of carbon particles, the carbon particles are burned, thereby realizing the active regeneration of GPF5.

During the active regeneration process of GPF5, the GPF temperature module in the engine control unit calculates the exhaust temperature in GPF5 based on the carbon load, unburned pollutants, and the amount of air pumped in, and compares the exhaust temperature with the GPF tolerance temperature Make a comparison to confirm whether the GPF is overheated. If it is overheated, the secondary air pump 8 will be turned off. If it is not overheated, it will continue to actively regenerate until the carbon load in the GPF is lower than the regeneration preset target value. At this time, the secondary air pump 8 The air pump 8 is switched off, ending the active regeneration.

The preferred implementation of the present invention has been described in detail above in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the specific details of the above-mentioned implementation. Within the scope of the technical concept of the present invention, any person skilled in the art Within the technical scope disclosed in the present invention, equivalent replacements or changes are made according to the technical solutions and the inventive concepts of the present invention, and these simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (4)

1. The utility model provides a passenger car GPF regenerating unit, its characterized in that includes air cleaner (1), engine (2), three way catalyst converter (3), GPF (5), differential pressure sensor (6), secondary air pump (8), wherein the air inlet of engine (2) and the export intercommunication of air cleaner (1), the gas vent of engine (2) and the entry intercommunication of three way catalyst converter (3), the export of three way catalyst converter (3) is through GPF intake pipe (4) and the air inlet intercommunication of GPF (5), the gas outlet and the GPF blast pipe (7) of GPF (5) link to each other, and be equipped with differential pressure sensor (6) between the inlet end of GPF (5) and the end of giving vent to anger, secondary air pump (8) one end and air cleaner (1) intercommunication, the other end and GPF (4) intercommunication, and GPF (5) the pore wall internal coating has the catalyst.

2. The GPF regeneration device of the passenger vehicle as claimed in claim 1, wherein the air inlet end of the GPF (5) is connected with one end of a GPF air inlet pipe (4) and one end of a differential pressure sensor (6) respectively, and the air outlet end of the GPF (5) is connected with the other end of a GPF exhaust pipe (7) and the other end of the differential pressure sensor (6) respectively.

3. A passenger vehicle GPF regeneration unit according to claim 1, characterized in that said catalyst is a three-way catalyst.

4. A control method for actively regenerating a GPF of a passenger car by using the GPF regeneration device of the passenger car of any one of claims 1 to 3, characterized by comprising the following steps:

step one, a differential pressure sensor (6) and a secondary air pump (8) are respectively in control connection with an engine control unit, so that the engine control unit can receive a detection signal of the differential pressure sensor (6) and can control the secondary air pump (8) to be opened and closed;

step two, an engine control unit collects vehicle working condition information, including vehicle speed, accelerator opening, engine rotating speed, torque and detection signals of a differential pressure sensor (6), and calculates the current carbon carrying capacity in a GPF (5) through a GPF particulate matter module in the engine control unit;

step three, comparing the carbon load of the GPF (5) with a first carbon load threshold which is set in a calibration mode, if the carbon load does not exceed the first carbon load threshold, the GPF does not need to be regenerated, and if the carbon load exceeds the first carbon load threshold, the GPF needs to be regenerated;

step four, a GPF regeneration condition confirmation module in the engine control unit determines whether the regeneration condition set in a calibration mode is met or not according to the ambient temperature, the engine speed, the engine torque, the vehicle speed and the air-fuel ratio parameters, if the regeneration condition is not met, the secondary air pump (8) is not started, if the regeneration condition is met, a secondary air calculation module in the engine control unit calculates the required secondary air intake quantity and starts the secondary air pump (8), the air filtered by the air filter (1) is introduced into the GPF air inlet pipe (4) through the secondary air pump (8), the air and the exhaust gas in the GPF air inlet pipe (4) are mixed and enter the GPF (5) coated with the catalyst, unburned HC and CO react with the oxygen of the air under the action of the catalyst and release a large amount of heat to enable the temperature in the GPF (5) to be raised to the combustible temperature of the carbon particles, and the carbon particles are combusted, so that the active regeneration of the GPF (5) is achieved;

step five, in the active regeneration process of the GPF (5), a GPF temperature module in an engine control unit calculates the exhaust temperature in the GPF (5) according to the carbon loading capacity, unburned pollutants and the pumped air quantity, compares the exhaust temperature with the GPF tolerance temperature and confirms whether the GPF is over-temperature or not;

and step six, if the temperature is over-temperature, the engine control unit controls the secondary air pump (8) to be closed, if the temperature is not over-temperature, active regeneration is continuously carried out until the GPF particulate matter module in the engine control unit calculates that the current carbon loading in the GPF (5) is lower than the first carbon loading threshold, and at the moment, the engine control unit controls the secondary air pump (8) to be closed, and the active regeneration is finished.

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