ENGINE SYSTEM FOR DEDICATED EXHAUST GAS RECIRCULATION CONTROL
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Filing Date
- 2020-12-15
- Publication Date
- 2026-07-23
AI Technical Summary
Existing internal combustion engines face challenges in optimizing engine efficiency through dedicated exhaust gas recirculation (EGR) systems, particularly in managing the flow of exhaust gases into the intake manifold to balance air-fuel mixture and torque output.
A system with a bypass valve, EGR valve, and intake air valve, controlled by modules to manage the flow of exhaust gases into the intake manifold, using sensors to adjust valve openings based on pressure differentials and engine conditions, ensuring optimal EGR and air intake.
Enhances engine efficiency by stabilizing the air-fuel mixture and torque output, minimizing noise, and optimizing EGR flow, thereby improving overall engine performance.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
INTRODUCTION
[0001] The information provided in this section serves the purpose of providing a general overview of the context of the disclosure. The work of the inventors currently named, to the extent described in this section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor implicitly admitted as prior art with respect to the present disclosure.
[0002] The present disclosure relates to internal combustion engines and, more specifically, intake and exhaust systems of internal combustion engines.
[0003] Internal combustion engines burn an air / fuel mixture within cylinders to drive pistons, which generate drive torque. In some types of engines, the airflow into the engine can be regulated by a throttle. The throttle can adjust the throttle range, which increases or decreases the airflow into the engine. As the throttle range increases, the airflow into the engine increases. A fuel control system adjusts the rate at which fuel is injected to provide the cylinders with a desired air / fuel mixture and / or to achieve a desired torque output. Increasing the amount of air and fuel supplied to the cylinders generally increases the engine's torque output.
[0004] Under certain circumstances, the use of dedicated exhaust gas recirculation (EGR) can be beneficial for engine efficiency. With dedicated EGR, one or more cylinders of an engine can recirculate all of their exhaust gas to the air intake system. In this case, their exhaust pulse is removed from the exhaust system and introduced into the air intake system. SUMMARY
[0005] In one feature, an engine system comprises: an internal combustion engine with multiple cylinders; a bypass valve arranged to receive exhaust gas emitted by at least one dedicated cylinder and selectively direct one of: the exhaust gas through an exhaust system to the atmosphere; and the exhaust gas into an exhaust gas recirculation (EGR) valve; the EGR valve, wherein the EGR valve is configured to allow, when open, the flow of exhaust gas into an intake manifold of the internal combustion engine; and an intake air valve located between an air cleaner and a mass airflow (MAF) sensor and configured to allow, when open, the flow of ambient air into the intake manifold.
[0006] Other features include an air / EGR mixer configured to mix ambient air and exhaust gas received from the EGR valve.
[0007] In further features, an EGR line is connected between the EGR valve and the air / EGR mixer, with the EGR line being shorter than a predetermined length.
[0008] Other features include the predetermined length. 2 Foot.
[0009] In other features, a turbine of a turbocharger is located downstream of the bypass valve.
[0010] In other features, a compressor of the turbocharger is located downstream of the MAF sensor.
[0011] In other features, an EGR cooler is located between the bypass valve and the EGR valve and is configured to cool the exhaust gas flowing from the bypass valve into the EGR valve.
[0012] In addition, a delta pressure sensor is configured to measure a pressure delta across the intake air valve.
[0013] Further features include an EGR pressure sensor configured to measure EGR pressure at a point between the bypass valve and the EGR valve; and an exhaust pressure sensor configured to measure exhaust gas pressure in the exhaust system downstream of the bypass valve.
[0014] Other features include an EGR control module configured to control the opening of the EGR valve;
[0015] An intake control module is configured to control the opening of the intake air valve; and a bypass control module is configured to control the actuation of the bypass valve.
[0016] In other features, the bypass control module is configured to actuate the bypass valve in response to a command to perform EGR, in order to direct the exhaust gas into the EGR valve.
[0017] In further features, in response to the determination to perform EGR, the intake control module is configured to adjust the opening of the intake air valve based on a pressure delta across the intake air valve and a target delta pressure across the intake air valve when a manifold absolute pressure within the intake manifold is greater than or equal to atmospheric pressure.
[0018] In other features, the intake control module is configured to adjust the opening of the intake air valve based on setting the pressure delta across the intake air valve in the direction of the target delta pressure across the intake air valve.
[0019] In further features, in response to the determination to perform EGR, the EGR control module is configured to open the EGR valve to a predetermined fully open position when the manifold absolute pressure inside the intake manifold is greater than atmospheric pressure.
[0020] In further features, in response to the determination to perform the EGR, the intake control module is configured to adjust the opening of the intake air valve based on the pressure delta across the intake air valve and the target delta pressure across the intake air valve when the manifold absolute pressure inside the intake manifold is less than atmospheric pressure.
[0021] In further features, in response to the determination to perform EGR, the EGR control module is configured to adjust the opening of the EGR valve based on (1) a pressure difference between the EGR pressure and the pressure in the exhaust system downstream of the bypass valve and (2) a target value of the pressure difference between the EGR pressure and the pressure in the exhaust system downstream of the bypass valve when the manifold absolute pressure inside the intake manifold is less than atmospheric pressure.
[0022] In other features, the EGR control module is configured to adjust the opening of the EGR valve based on setting the pressure differential towards the target value of the pressure differential.
[0023] In other features, the bypass control module is configured to actuate the bypass valve in response to a setting not to perform EGR, in order to direct the exhaust gas through the exhaust system into the atmosphere.
[0024] In further features, the intake control module is configured to open the intake air valve to a predetermined fully open position in response to the determination not to perform EGR; and the EGR control module is configured to close the EGR valve to a predetermined fully closed position in response to the determination not to perform EGR.
[0025] In one feature, a method comprises: generating exhaust gas through a multi-cylinder internal combustion engine; receiving exhaust gas emitted from at least one dedicated cylinder through a bypass valve; and selectively directing one of the following: directing the exhaust gas through an exhaust system to the atmosphere; directing the exhaust gas into an exhaust gas recirculation (EGR) valve to allow, when open, a flow of exhaust gas into an intake manifold of the internal combustion engine; and, when open, allowing an intake air valve located between an air cleaner and a mass air flow (MAF) sensor to allow a flow of ambient air into the intake manifold.
[0026] Further areas of applicability of the present disclosure will become apparent from the detailed description, the claims, and the drawings. The detailed description and the specific examples are intended solely for illustration and are not meant to limit the scope of the disclosure. List of characters
[0027] The present revelation will be more fully understood from the detailed description and accompanying drawings, whereby: Fig. 1 and Fig. 2 are functional block diagrams of an exemplary motor system; Fig. Figure 3 is a functional block diagram of an exemplary engine control system; and Fig. Figure 4 is a flowchart that clearly illustrates an exemplary procedure for controlling an intake air valve, a bypass valve and an EGR valve.
[0028] Reference symbols can be reused in the drawings to identify similar and / or identical elements. DETAILED DESCRIPTION
[0029] An internal combustion engine burns an air / fuel mixture within cylinders to produce torque. Air flows through an air cleaner before entering the engine's intake manifold. A mass airflow (MAF) sensor measures the mass airflow rate of air entering the engine.
[0030] Combustion within the cylinders produces exhaust gas. All the exhaust gas from one or more of the engine's cylinders can be recirculated back to the engine via an exhaust gas recirculation (EGR) valve. A mixer can be implemented to blend the recirculated exhaust gas with the air flowing into the intake manifold and to balance the recirculated exhaust gas flow to the intake manifold.
[0031] According to the present application, an intake air valve is implemented between a turbocharger compressor and the air purifier. More precisely, the intake air valve can be implemented between the air purifier and the MAF sensor. An engine control module (ECM) controls the intake air valve and the EGR valve to minimize errors in the MAF sensor measurements and to minimize engine noise emitted through the intake system.
[0032] Referring now to Fig. 1. A functional block diagram of an example motor system is shown. 100 presented. The engine system 100 a vehicle includes an engine 102 , which burns an air / fuel mixture to generate torque based on driver input from a driver input module 104 to generate air. Air is fed into the engine. 102 through an intake system 108 suctioned. The suction system 108 can an intake manifold 110 and a throttle valve112 include. The throttle valve can only be used as an example. 112 include a butterfly valve with a rotating blade. An engine control module (ECM) 114 controls a throttle actuator module 116 and the throttle actuator module 116 regulates the opening of the throttle valve 112 , to improve airflow into the intake manifold 110 to control. In various implementations, the throttle valve can 112 and the throttle actuator module 116 omitted.
[0033] The air from the intake manifold 110 is injected into the cylinders of the engine 102 sucked in. While the engine 102 Since it comprises several cylinders, a single representative cylinder is used for illustration. 118 shown. The engine can only be used as an example. 102 2, 3, 4, 5, 6, 8, 10 and / or 12 cylinders.
[0034] The engine 102It can be operated using a four-stroke cycle or another suitable engine cycle. The four strokes of a four-stroke cycle, described below, are called the intake stroke, the compression stroke, the combustion stroke, and the exhaust stroke. During each revolution of a crankshaft (not shown), two of the four strokes occur within the cylinder. 118 on.
[0035] Therefore, two crankshaft revolutions are required for the cylinder 118 necessary to experience all four strokes. For four-stroke engines, one engine cycle can correspond to two crankshaft revolutions.
[0036] If the cylinder 118 When activated, air is drawn from the intake manifold during the intake stroke. 110 into the cylinders 118 through an intake valve 122 vacuumed. The ECM 114 controls a fuel actuator module 124which regulates the fuel injection to achieve a desired air / fuel ratio. The fuel can be injected at a central point or at several points, such as near the intake valve. 122 each of the cylinders, into the intake manifold 110 Fuel can be injected. In various implementations (not shown), fuel (e.g., gasoline) can be injected directly into the cylinders or into mixing chambers / inlets assigned to the cylinders.
[0037] The injected fuel mixes with air, creating an air / fuel mixture in the cylinder. 118 During the compression stroke, a piston (not shown) compresses the air inside the cylinder. 118 The air / fuel mixture. The engine 102 It could be a compression-ignition engine, in which case compression causes the ignition of the air / fuel mixture. Alternatively, the engine could be... 102a spark-ignition engine, in this case a spark actuator module 126 a spark plug 128 in the cylinder 118 Energy based on a signal from the ECM 114 supplied, which ignites the air / fuel mixture. Some types of engines, such as homogeneous charge compression ignition (HCCI) engines, perform both compression ignition and spark ignition. The timing of the spark can be specified relative to the point at which the piston is in its highest position, known as top dead center (TDC).
[0038] The ignition spark actuator module 126 It can be controlled by a timing signal that specifies how far before or after the TDC (Total Discharge Cycle) the ignition spark should be generated. Since the piston position is directly related to the crankshaft rotation, the operation of the ignition spark actuator module can be...126 be synchronized with the position of the crankshaft.
[0039] During the combustion stroke, the combustion of the air / fuel mixture drives the piston downwards, thereby driving the crankshaft. The combustion stroke can be defined as the time between when the piston reaches top dead center (TDC) and when the piston returns to its lowest position, known as bottom dead center (BDC).
[0040] During the exhaust stroke, the piston begins to move upwards from the BDC and forces the combustion byproducts through an exhaust valve. 130 The combustion byproducts are removed via an exhaust system. 134 exited the vehicle.
[0041] The intake valve 122 can be achieved through an intake camshaft 140 be controlled while the exhaust valve 130 through an exhaust camshaft 142It can be controlled. In various implementations, multiple intake camshafts (including the intake camshaft) can be controlled. 140 ) several intake valves (including the intake valve 122 ) for the cylinder 118 control and / or can control the intake valves (including the intake valve) 122 ) of several banks of cylinders (including the cylinder 118 ) control. Similarly, multiple exhaust camshafts (including the exhaust camshaft) can be controlled. 142 ) several exhaust valves for the cylinders 118 control and / or can control exhaust valves (including the exhaust valve) 130 ) for multiple banks of cylinders (including the cylinders 118) control. While a camshaft-based valve actuation system has been shown and explained, camless valve actuators can be implemented. While separate intake and exhaust camshafts are shown, a single camshaft with ridges for both the intake and exhaust valves can be used.
[0042] The point in time when the intake valve 122 The opening can be adjusted with reference to the piston's TDC by an intake cam adjuster. 148 can be varied. The timing when the exhaust valve 130 When open, the TDC of the piston can be adjusted by an exhaust cam adjuster. 150 can be varied. An adjusting actuator module 158 can adjust the intake camshaft 148 and the exhaust cam adjuster 150 based on signals from the ECM 114 Control. If implemented, a variable valve lift (not shown) can also be controlled by the adjuster actuator module.158 can be controlled. In various other implementations, the intake valve can be... 122 and / or the exhaust valve 130 controlled by actuators other than a camshaft, such as electromechanical actuators, electrohydraulic actuators, electromagnetic actuators, etc.
[0043] The engine system 100 may include a turbocharger that is attached to the intake manifold 110 It provides compressed air. The turbocharger includes a turbine. 160-1 , which is powered by exhaust gases, which are routed through the exhaust system 134 flow. The turbocharger also includes a compressor. 160-2 , which passes through the turbine 160 1 is driven and which goes into the throttle valve 112 Leading air is compressed.
[0044] A wastegate 162 can allow the exhaust gas to pass through the turbine 160 1to bypass this, thereby reducing the boost (the degree of intake air compression) of the turbocharger. The ECM 114 The turbocharger can be controlled via a boost actuator module. 164 control. The boost actuator module 164 The boost from the turbocharger can be controlled by adjusting the position of the wastegate. 162 Modulate. In various implementations, multiple turbochargers can be controlled by the boost actuator module. 164 The turbocharger can have a variable geometry, controlled by the boost actuator module. 164 can be controlled.
[0045] Although shown separately for illustrative purposes, the turbine 160-1 and the compressor 160-2 mechanically coupled together.
[0046] The engine system 100 Can an exhaust gas recirculation (EGR) valve 170 include which exhaust gas is selectively directed to the intake manifold 110 redirects it back. The EGR valve 170can be achieved through an EGR actuator module 172 They are controlled. A further explanation of the intake and exhaust systems follows below in conjunction with... Fig. 2 provided.
[0047] The crankshaft position can be determined using a crankshaft position sensor. 180 be measured. The crankshaft position sensor 180 The sensor monitors a wheel with N teeth that rotates with the crankshaft and generates a crankshaft position signal based on the rotation of the wheel with N teeth. The crankshaft position sensor can be used as an example only. 180 Include a variable reluctance (VR) sensor or another suitable type of crankshaft position sensor. The gear with N teeth includes space for N teeth.
[0048] The crankshaft position sensor 180Each time a tooth of the gear with N teeth (e.g., a rising or falling flank of the tooth) contacts the crankshaft position sensor, a pulse is generated in the crankshaft position signal. 36 This occurs. Accordingly, each pulse in the crankshaft position signal can correspond to an angular rotation of the crankshaft by an amount equal to 360° divided by N. By way of example only, the gear with N teeth can have space for 60 equally spaced teeth (i.e., N = 60), and each pulse in the crankshaft position signal can therefore correspond to approximately 6° of crankshaft rotation. In various implementations, one or more of the N teeth may be omitted. Again, by way of example only, two of the N teeth may be omitted in various implementations.
[0049] The temperature of the engine coolant can be measured using an engine coolant temperature (ECT) sensor 182. The ECT sensor 182 can be within the engine 102 or located in other places where the coolant circulates, such as on a radiator (not shown).
[0050] Pressure within the intake manifold 110 can be measured using a manifold absolute pressure (MAP) sensor 184. A mass flow rate of air entering the intake manifold. 110 The airflow can be measured using a mass airflow (MAF) sensor 186. The MAF sensor can be implemented in various ways. 186 be located in a housing that also houses the throttle valve 112 includes.
[0051] The position of the throttle valve 112The temperature of the engine can be measured using one or more throttle position sensors (TPS). 102 The intake air temperature can be measured using an intake air temperature (IAT) sensor 192. The engine system 100 can also include one or more other sensors 193 include the ECM 114 can use signals from the sensors to make control decisions for the engine system 100 close.
[0052] The ECM 114 can be used with a transmission control module 194 They communicate, for example, to coordinate gear shifting in a transmission. For example, the ECM can 114 Reduce engine torque during a gear shift. The ECM 114 can be used, for example, with a hybrid control module 196 communicate to control the operation of the engine 102 and an electric motor 198to coordinate. The electric motor 198 It can also function as a generator and can be used to produce electrical energy for use by a vehicle's electrical systems and / or for storage in a battery. While only the electric motor 198 As shown and explained, multiple electric motors can be implemented. Different implementations can include different functions of the ECM. 114 , of the transmission control module 194 and the hybrid control module 196 be integrated into one or more modules.
[0053] Referring now to Fig. 2 shows a functional block diagram of the exemplary motor system of Fig. 1 presents. As in Fig. As shown in section 2, it flows into the engine. 102 Air flowing through an air purifier 204 The air purifier 204It may include one or more filters to filter airborne particles from the air when the air passes through the air purifier. 204 flows. An intake air valve 208 is between the air purifier 204 and the compressor 160-2 localized, such as between the air purifier 204 and the MAF sensor 186 Locating the intake air valve 208 between the air purifier 204 and the compressor 160-2 and more precisely, between the air purifier 204 and the MAF sensor 186 This can ensure more stable control. An intake actuator module 210 controls the opening of the intake air valve 208 based on an input from the ECM 114 .
[0054] A delta pressure sensor 212 measures a pressure difference across the intake air valve 208 More precisely, the delta pressure sensor measures 212a pressure difference based on a difference between a pressure downstream of the intake air valve 208 and a pressure upstream of the intake air valve 208 .
[0055] A charge air cooler (CAC) 216 cools the air from the compressor. 160-2 Discharged air. In various implementations, an intercooler can be used instead of the CAC. 216 be implemented.
[0056] The engine 102 It comprises several cylinders. For example, the engine can 102 four cylinders, as in Fig. 2 shown. However, the present application is not limited to four-cylinder engines. The engine 102 It can include a larger or smaller number of cylinders. While the example of the engine 102 If a turbocharger is provided, the turbocharger can be omitted and the engine 102 It can of course be drawn in. The intercooler216 would be omitted if the turbocharger were omitted.
[0057] In the example of a turbocharged four-cylinder engine, one of the cylinders is a dedicated exhaust gas recirculation (EGR) cylinder 220. The dedicated EGR cylinder 220 directs exhaust gas to a bypass valve 224 In other engines, more than one cylinder can have a dedicated EGR cylinder. When in the first state, the bypass valve directs 224 that from the dedicated EGR cylinder 220 exhaust gases exclusively to the exhaust turbine 160-1 When in a second state, the bypass valve conducts 224 that from the dedicated EGR cylinder 220 Exhaust gases are exclusively routed to the EGR valve. 170 The bypass valve 224 It can be in either the first or the second state and cannot include any other states. The other cylinders all send exhaust gases to the turbine. 160-1Fuel supply, ignition timing and / or one or more other parameters of the dedicated EGR cylinder 220 They can be controlled differently than the other cylinders. A bypass actuator module. 226 controls the opening of the bypass valve 224 based on an input from the ECM 114 .
[0058] An EGR cooler 228 is between the EGR valve 170 and the bypass valve 224 implemented. The EGR cooler 228 This is cooled by the EGR cooler. 228 Flowing exhaust gas. When open, the EGR valve releases... 170 received exhaust gas to an air / EGR mixer 232 off. The air / EGR mixer 232 mixes exhaust gas that comes from the dedicated EGR cylinder 220 is returned with fresh air that enters the engine 102 It flows. The air / EGR mixer 232 Even pulses during EGR from the dedicated EGR cylinder 220, so that a more consistent amount (with minor variations) is supplied to all cylinders of the engine 102 is provided.
[0059] The EGR valve 170 can be placed so close to the air / EGR mixer 232 It should be located as locally as possible. For example, the EGR valve 170 with the air / EGR mixer 232 through an EGR line 234 The connected object must be shorter than a predetermined length. The predetermined length could be, for example, 2 feet, 1 foot, 8 inches, or another suitable length.
[0060] An EGR pressure sensor 236 measures a pressure between the bypass valve 224 and the EGR cooler 228 An exhaust pressure sensor 240 measures the pressure in the turbine 160-1 entered exhaust gas.
[0061] As in Fig. As illustrated in 2, a three-way catalyst (TWC) 250 can pass through the turbine 160-1Treat the flowing exhaust gas before it is released into the atmosphere.
[0062] Fig. Figure 3 is a functional block diagram of an example implementation of the ECM. 114 A motor load module 304 determines an (existing) engine load 308 The engine load module 304 can the engine load 308 for example, based on the reading from the MAP sensor 184 measured (existing) MAP 312 determine the MAP relative to a predetermined maximum MAP of the engine. 102 is measured. Based on driver input, the engine load module can 304 the engine load 308 set to a predetermined maximum value (e.g., 100 percent), where the MAP 312 is equal to the predetermined maximum MAP. Based on driver input, the engine load module can 304 the engine load 308decrease away from the predetermined maximum value and towards a predetermined minimum value (e.g., 0 percent) when the MAP changes. 312 The MAP (mapped maximum value) is reduced from the predetermined maximum value. Based on driver input, the engine load module can... 304 the engine load 308 increase towards the predetermined maximum value when the MAP 312 increases in the direction of the predetermined maximum MAP.
[0063] An engine speed module 316 determines an (existing) engine speed 320 based on the crankshaft position 324 , which use the crankshaft position sensor 180 is measured. For example, the engine speed module 316 the engine speed 320 based on a change in the crankshaft position 324 determine over a period of time.
[0064] A target delta module 328 determines a target delta pressure 332via the delta pressure sensor 212 based on the engine speed 320 and the engine load 308 The target delta module 328 can determine the target delta pressure 332 For example, by using an equation and a lookup table that relates engine speeds and engine loads to target delta pressures. The target delta pressure 332 is a target measurement of the delta pressure sensor 212 (i.e., a target value for the intake pressure difference) 368 ).
[0065] A target differentiation module 336 determines a target pressure difference 340 between the exhaust pressure 344 , which is driven by the exhaust pressure sensor 240 is measured, and the EGR pressure 348 , which is measured by the EGR pressure sensor 236 is measured. The target difference module 336 determines the target pressure difference 340 based on the engine load 308 and the engine speed 320The target difference module 336 can the target pressure difference 340 for example, by using an equation and a reference table that relates engine speeds and engine loads to target pressure differences.
[0066] A difference module 352 determines an (existing) exhaust gas pressure difference 356 based on a difference between the exhaust pressure 344 and the EGR pressure 348 For example, the difference module 352 the exhaust pressure difference 356 (1) based on or equal to the exhaust pressure 344 minus the EGR pressure 348 or (2) based on or equal to the EGR pressure 348 minus the exhaust pressure 344 a.
[0067] An intake control module 360 determines a target intake opening 364 of the intake air valve 208 , as further explained below. For example, the intake control module 360the target intake opening 364 selectively adjust to the intake pressure differential 368 , which are measured by the delta pressure sensor 212 is measured in the direction of the target delta pressure. 332 to adjust.
[0068] An EGR control module 372 determines a target EGR opening 376 the EGR valve 170 , as further explained below. For example, the EGR control module 372 the target EGR opening 376 selectively adjust to the exhaust pressure differential 356 in the direction of the target pressure difference 340 to adjust.
[0069] A bypass control module 380 determines a target bypass opening 384 of the bypass valve 224 The bypass control module 380 can the target bypass opening 384 adjust so that the bypass valve 224 in the first state, when an EGR flow passes through the ECM 114 is requested (e.g., the EGR valve)170 currently, or is required to be at least partially open (e.g., more than 0 percent open). The bypass control module 380 can the target bypass opening 384 adjust so that the bypass valve 224 The second state is when the EGR flow passes through the ECM. 114 is deactivated (e.g., the EGR valve) 170 or is instructed to be fully closed (e.g., 0 percent open), such as during engine start-up. 102 , during engine shutdown 102 , during engine idling 102 etc.
[0070] Fig. Figure 4 is a flowchart illustrating an exemplary procedure for controlling the intake air valve. 208 , of the bypass valve 224 and the EGR valve 170 This is clearly illustrated. The control begins with 404, where the ECM 114 determines whether the EGR is directed at its intake manifold and exhaust gas is directed there.110 from the dedicated EGR cylinder 220 was intended to be traced back. If 404 If the error is incorrect, the control switches to 408.
[0071] At 408 The intake control module 360 the target intake opening 364 into a predetermined fully open opening (e.g., 100 percent open), the EGR control module 372 represents the target EGR opening 376 into a predetermined fully closed opening (e.g., 0 percent open) and the bypass control module 380 represents the target bypass opening 384 one, so that the bypass valve 224 It will be in its second state. The intake actuator module 210 controls the opening of the intake air valve 208 , to the target intake opening 364 to reach the bypass actuator module 226 controls the bypass valve 224 , to open the target bypass 384 to achieve, and the EGR actuator module 172controls the EGR valve 170 , to achieve the target EGR opening 376 to achieve. If 404 If this is true, the control continues with 412.
[0072] At 412 determine the intake control module 360 and the EGR control module 372 , whether the MAP 312 smaller than the (existing) atmospheric pressure. An atmospheric pressure sensor can measure atmospheric pressure. If 412 If this is true, the control continues with 416. 412 If the value is incorrect, the control system continues with 420.
[0073] At 416 The intake control module 360 the target intake opening 364 one, to the intake pressure difference 368 in the direction of or towards the target delta pressure 332 to adjust the EGR control module 372 represents the target EGR opening 376 to the predetermined fully open opening (e.g., 100 percent open) and the bypass control module 380represents the target bypass opening 384 one, so that the bypass valve 224 It will be in its initial state. The intake actuator module 210 controls the opening of the intake air valve 208 , to the target intake opening 364 to reach the bypass actuator module 226 controls the bypass valve 224 , to open the target bypass 384 to achieve, and the EGR actuator module 172 controls the EGR valve 170 , to achieve the target EGR opening 376 to reach.
[0074] At 420 The intake control module 360 the target intake opening 364 one, to the intake pressure difference 368 in the direction of or towards the target delta pressure 332 to adjust the EGR control module 372 represents the target EGR opening 376 one to reduce the exhaust pressure difference 356 in the direction of or towards the target pressure difference 340 to adjust, and the bypass control module380 represents the target bypass opening 384 one, so that the bypass valve 224 It will be in its initial state. The intake actuator module 210 controls the opening of the intake air valve 208 , to the target intake opening 364 to reach the bypass actuator module 226 controls the bypass valve 224 , to open the target bypass 384 to achieve, and the EGR actuator module 172 controls the EGR valve 170 , to achieve the target EGR opening 376 to reach.
[0075] If the intake pressure difference 368 for example, smaller than the target delta pressure 332 is, the intake control module 360 reduce the target intake opening to decrease the intake pressure differential 368 in the direction of or towards the target delta pressure 332 to increase. If the intake pressure difference 368 greater than the target delta pressure 332 is, the intake control module 360Increase the target intake opening to increase the intake pressure differential. 368 in the direction of or towards the target delta pressure 332 to reduce. If the exhaust pressure difference 356 smaller than the target pressure difference 340 If so, the EGR control module 372 the target EGR opening 376 reduce the exhaust pressure difference 356 in the direction of or towards the target pressure difference 340 to increase. If the exhaust pressure difference 356 greater than the target pressure difference 340 If so, the EGR control module 372 the target EGR opening 376 increase to increase the exhaust pressure difference 356 in the direction of or towards the target pressure difference 340 to reduce.
[0076] The foregoing description is for illustrative purposes only and is not intended to limit the disclosure, its application, or uses. The broad teachings of the disclosure can be implemented in a variety of forms. Although this disclosure includes certain examples, the true scope of the disclosure should therefore not be so limited, since other modifications will become apparent upon study of the drawings, the specification, and the following claims. It should be understood that one or more steps within a process may be carried out in a different order (or concurrently) without altering the principles of the present disclosure.Although each of the embodiments described above is characterized by certain features, each or more of these described features may furthermore be implemented in and / or combined with features of one of the other embodiments in relation to one embodiment of the disclosure, even if such combination is not expressly described. In other words, the described embodiments are not mutually exclusive, and permutations of one or more embodiments among themselves remain within the scope of this disclosure.
[0077] Spatial and functional relationships between elements (e.g., between modules, switching elements, semiconductor layers, etc.) are described using various terms, including "connected," "latched," "coupled," "adjacent," "adjacent," "next to," "above," "on," "below," and "arranged." Unless expressly described as "direct," when a relationship between first and second elements is described in the above disclosure, this relationship can be a direct relationship in which no other intervening elements exist between the first and second elements, or it can also be an indirect relationship in which one or more intervening elements (either spatial or functional) exist between the first and second elements.As used here, the phrase "at least one of A, B and C" should be interpreted as meaning a logical (A OR B OR C) using a non-exclusive logical OR, and not as meaning "at least one of A, at least one of B and at least one of C".
[0078] In the diagrams, the direction of an arrow, as indicated by the arrowhead, generally shows the flow of information (e.g., data or instructions) that is relevant to the illustration. For example, if Element A and Element B exchange a variety of information, but information transferred from Element A to Element B is relevant to the illustration, the arrow may point from Element A to Element B. This unidirectional arrow does not mean that no further information is transferred from Element B to Element A. Furthermore, Element B may send requests or acknowledgments of information to Element A for information sent from Element A to Element B.
[0079] In this application, including the following definitions, the term "module" or the term "controller" may be replaced by the term "circuit". The term "module" may refer to being part of or comprising: an application-specific integrated circuit (ASIC); a digital, analog, or mixed analog / digital discrete circuit; a digital, analog, or mixed analog / digital integrated circuit; a combinational logic circuit; a field-programmable gate array (FPGA); a processor controller (shared, dedicated, or group) that executes code; a memory circuit (shared, dedicated, or group) that stores code executed by the processor controller; other suitable hardware components that provide the described functionality; or a combination of some or all of the above components, such as in a system-on-a-chip.
[0080] The module may include one or more interface circuits. In some examples, the interface circuits may include wired or wireless interfaces connected to a local area network (LAN), the internet, a wide area network (WAN), or combinations thereof. The functionality of a particular module of this disclosure may be distributed across multiple modules connected via interface circuits. For example, multiple modules may enable load balancing. In another example, a server module (also referred to as a remote or cloud module) may perform certain functionality on behalf of a client module.
[0081] The term "code," as used above, can include software, firmware, and / or microcode, and can refer to programs, routines, functions, classes, data structures, and / or objects. The term "shared processor circuit" refers to a single processor circuit that executes some or all of the code from multiple modules. The term "group processor circuit" refers to a processor circuit that, in combination with additional processor circuits, executes some or all of the code from one or more modules. References to "multi-processor circuits" include multi-processor circuits on discrete matrices, multi-processor circuits on a single die, multiple cores of a single processor circuit, multiple threads of a single processor circuit, or a combination of the above.The term shared processor circuit refers to a single memory circuit that stores some or all of the code from multiple modules. The term group memory circuit refers to a memory circuit that, in combination with additional memory, stores some or all of the code from one or more modules.
[0082] The term memory circuit is a subset of the term computer-readable medium. The term computer-readable medium, as used here, encompasses non-volatile electrical or electromagnetic signals that propagate through a medium (such as on a carrier wave); the term computer-readable medium can therefore be considered tangible and non-volatile. Non-restrictive examples of a non-volatile, tangible, computer-readable medium include non-volatile memory circuits (such as a flash memory circuit, an erasable programmable read-only memory circuit, or a mask read-only memory circuit), volatile memory circuits (such as a static random-access memory circuit or a dynamic random-access memory circuit), magnetic storage media (such as an analog or digital magnetic tape or a hard disk), and optical storage media (such as a CD, a DVD, or a Blu-ray Disc).
[0083] The devices and methods described in this application can be implemented in part or in whole by a special-purpose computer created by configuring a general-purpose computer to perform one or more specific functions contained in computer programs. The functional blocks, flowchart components, and other elements described above serve as software specifications that can be translated into computer programs through the routine work of a skilled engineer or programmer.
[0084] Computer programs comprise processor-executable instructions stored on at least one non-volatile, tangible, machine-readable medium. Computer programs may also contain or rely on stored data. Computer programs may include a basic input / output system (BIOS) that interacts with the hardware of the special-purpose computer, device drivers that interact with specific devices of the special-purpose computer, one or more operating systems, user applications, background services, background applications, etc.
[0085] The computer programs can include: (i) descriptive text to be parsed, such as HTML (Hypertext Markup Language), XML (Extensible Markup Language), or JSON (JavaScript Object Notation); (ii) assembly code; (iii) object code generated from source code by a compiler; (iv) source code for execution by an interpreter; (v) source code for compilation and execution by a just-in-time compiler; etc. The source code can be provided as an example with syntax from languages such as C, C++, C#, Objective-C, Swift, Haskell, Go, SQL, R, Lisp, Java®, Fortran, Perl, Pascal, Curl, OCaml, Javascript®, HTML5 (Hypertext Markup Language 5th Revision), Ada, ASP (Active Server Pages), PHP (PHP: Hypertext Preprocessor), Scala, Eiffel, Smalltalk, Erlang, Rubin, Flash®, Visual Basic®, Lua, written in MATLAB, SIMULINK and Python®.
Claims
[1] Engine system, comprising: a multi-cylinder internal combustion engine; a bypass valve arranged to receive exhaust gas emitted from at least one dedicated cylinder, and selectively from one of: Directing the exhaust gas through an exhaust system into the atmosphere; and Directing the exhaust gas into an exhaust gas recirculation (EGR) valve; the EGR valve, wherein the EGR valve is configured to allow, when open, the flow of exhaust gas into an intake manifold of the internal combustion engine; and An intake air valve located and configured between an air purifier and a mass airflow (MAF) sensor to allow ambient air to flow into the intake manifold when open. [2] Motor system according to claim 1, further comprising: an EGR pressure sensor configured to measure EGR pressure at a point between the bypass valve and the EGR valve; and an exhaust pressure sensor configured to measure exhaust gas pressure in the exhaust system downstream of the bypass valve. [3] Motor system according to claim 2, further comprising: an EGR control module configured to control the opening of the EGR valve; an intake control module configured to control the opening of the intake air valve; and a bypass control module configured to control the actuation of the bypass valve. [4] Engine system according to claim 3, wherein the bypass control module is configured to actuate the bypass valve in response to a determination to perform EGR, in order to direct the exhaust gas into the EGR valve. [5] Engine system according to claim 4, wherein, in response to the determination to perform EGR, the intake control module is configured to adjust the opening of the intake air valve based on a pressure delta across the intake air valve and a target delta pressure across the intake air valve when a manifold absolute pressure within the intake manifold is greater than or equal to atmospheric pressure. [6] Engine system according to claim 5, wherein, in response to the determination to perform EGR, the EGR control module is configured to open the EGR valve to a predetermined fully open position when the manifold absolute pressure inside the intake manifold is greater than atmospheric pressure. [7] Engine system according to claim 5, wherein, in response to the determination to perform EGR, the intake control module is configured to adjust the opening of the intake air valve based on the pressure delta across the intake air valve and the target delta pressure across the intake air valve when the manifold absolute pressure inside the intake manifold is less than atmospheric pressure. [8] Engine system according to claim 7, wherein, in response to the determination to perform EGR, the EGR control module is configured to adjust the opening of the EGR valve based on (1) a pressure difference between the EGR pressure and the pressure in the exhaust system downstream of the bypass valve and (2) a target value of the pressure difference between the EGR pressure and the pressure in the exhaust system downstream of the bypass valve when the manifold absolute pressure inside the intake manifold is less than atmospheric pressure. [9] Engine system according to claim 4, wherein the bypass control module is configured to actuate the bypass valve in response to a determination not to perform EGR, in order to direct the exhaust gas through the exhaust system into the atmosphere. [10] Motor system according to claim 9, wherein: the intake control module is configured to open the intake air valve to a predetermined fully open position in response to the determination not to perform EGR; and The EGR control module is configured to close the EGR valve to a predetermined fully closed position in response to the determination not to perform EGR.