DE102016119680A1 - Camshaft control systems and methods - Google Patents

Abstract

A pusher control module based on a mode command selectively drives pens into one or more poppet actuators of a camshaft pusher. By the contact between the pins and the grooves in the spool actuator (s) during rotation of a camshaft, the camshaft spool is axially displaced along the intake camshaft. A current mode module: determines a last stored indication of the mode command; commands the pusher control module to extend one of the pens to shift the camshaft pusher and reach the last stored indication of the mode command; and based on whether the one of the pens has deployed in response to the command indicates that a current mode is either: (i) the last stored indication of the mode command; or (ii) another mode. The mode command module updates the mode command to the current mode.

Description

TECHNICAL AREA

The present disclosure relates to internal combustion engines, and more particularly to systems and methods for controlling the camshaft spools.

BACKGROUND

The background description provided herein is for the purpose of generally illustrating the context of the disclosure. The work of the present inventors, in the scope described in this Background section, as well as aspects of the description, which are not otherwise considered prior art at the time of application, are expressly or impliedly prior art to the present disclosure.

Vehicles include an internal combustion engine that generates drive torque. In particular, an intake valve is selectively opened to draw air into the cylinder of the engine. The air mixes with the fuel to form a fuel / air mixture that is burned in the cylinder. The fuel / air mixture is compressed and burned to drive a piston within the cylinder. An exhaust valve selectively opens to vent exhaust gas from the cylinder during combustion.

In some circumstances, one or more cylinders of an engine may be deactivated. The deactivation of a cylinder may include deactivating the opening and closing of intake valves of the cylinder and stopping the fueling of the cylinder. One or more cylinders can be deactivated, eg. To reduce fuel consumption when the engine can generate a required amount of torque when one or more cylinders are deactivated.

A rotating camshaft controls the opening and closing of the intake and exhaust valves. The camshaft includes cam projections attached to and rotating with the camshaft. The geometric profile of a cam projection generally determines the period of time in which the valve is open (duration) and the opening or opening degree of the valve (valve lift). The vehicle may switch between different lift states (eg, high, low lift and deactivate) with the implementation of a slidable camshaft to maximize engine performance while maintaining fuel efficiency. Actuators, such as solenoid valves, can be used to control the shifting of the camshaft.

SUMMARY

In one function, a camshaft pusher control system of a vehicle engine is described. A mode command module selectively sets an inlet mode command to one of the following modes: a deactivation mode; a low lift mode; and a high lift mode. A spool control module based on the intake mode command selectively exhausts a first pin of a first spool actuator into a first grooved member of an intake camshaft spool, wherein contact between the first pin and the first groove during rotation of an intake camshaft axially displaces the intake camshaft spool in a first direction Intake camshaft slides; and selectively extending a second pin of a second spool actuator into a second groove of an intake camshaft spool, wherein contact between the second pin and the second groove during rotation of the intake camshaft slides the intake camshaft spool axially in a second direction along the intake camshaft. A current mode module: determines a last stored indication of the inlet mode command; commands the pusher control module to extend one of the first and second pens to push the intake camshaft pusher and reach the last stored indication of the intake mode command; and based on whether the one of the first and second pens has deployed in response to the command indicates that a current mode is either: (i) the last stored indication of the intake mode command; or (ii) another of the modes is deactivation mode, low lift mode and high lift mode. The mode command module updates the inlet mode command to the current inlet mode.

In further embodiments, the current mode module determines whether the one of the first and second pins is extended based on signals from at least one sensor connected to one of the first and second pins.

In further embodiments, the at least one sensor comprises at least one Hall effect sensor and a counter-electromagnetic force (EMF) sensor.

In further embodiments, the current mode module determines that the one of the first and second pins is extended when a change in the signals is greater than a predetermined value.

In further embodiments, the current mode module further has: in In response to a determination that the one of the first and second pins is extended in response to the command to extend one of the first and second pins, there is a second command to the slider control module to extend one of the first and second pins. to shift the intake camshaft pusher and reach the last stored indication of the intake mode command; and indicates that the current intake mode corresponds to the last stored display of the intake mode command if the one of the first and second pins is not extended in response to the second command to extend one of the first and second pins.

In further embodiments, for the current mode module, further, in response to a determination that the one of the first and second pins has extended in response to the command to extend one of the first and second pins, there is a second command to the slider control module to extend one of the first and second pins to shift the intake camshaft pusher and reach the last stored indication of the intake mode command; and indicates that the current intake mode corresponds to the last stored display of the intake mode command when the one of the first and second pins is extended in response to the second command to extend one of the first and second pins.

In other embodiments, the stored current mode module determines one of the first and second pins that is extended based on the last stored indication of the inlet mode command.

In one embodiment, a camshaft pusher control system of a vehicle engine is described. A mode command module selectively sets an exhaust mode command to one of the following modes: a deactivation mode; a non-deactivation lifting mode. A spool control module based on the exhaust mode command selectively exhausts a first pin of a spool actuator into a first grooved camshaft spool member wherein the contact between the first pin and the first groove during rotation of an exhaust camshaft causes the exhaust camshaft spool in a first direction axially along the exhaust camshaft slides; and selectively extending a second pin of a second spool actuator into a second groove of a camshaft spool grooved member, wherein the contact between the second pin and the second groove slides the exhaust camshaft spool axially along the exhaust camshaft in a second direction during rotation of the exhaust camshaft. A current mode module: determines a last stored indication of the exhaust mode command; issues a command to the pusher control module to extend one of the first and second pens to shift the exhaust camshaft pusher and reach the last stored indication of the exhaust mode command; and indicates that a current exhaust mode corresponds to the last stored display of the exhaust mode command if the one of the first and second pins is not extended in response to the command to extend one of the first and second pins. The mode command module updates the exhaust mode command to the current exhaust mode.

In further embodiments, the current mode module determines whether the one of the first and second pins is extended based on signals from at least one sensor connected to one of the first and second pins.

In further embodiments, the at least one sensor comprises at least one Hall effect sensor and a counter-electromagnetic force (EMF) sensor.

In further embodiments, the current mode module determines that the one of the first and second pins is extended when a change in the signals is greater than a predetermined value.

In further embodiments, the current mode module indicates that the current exhaust mode is one of the deactivation and non-deactivation modes when the one of the first and second pins is extended in response to the command to extend one of the first and second pins ,

In further embodiments, the current mode module determines the one of the first and second pens that is deployed based on the last stored display of the exhaust mode command.

In one embodiment, a camshaft pusher control method of a vehicle engine is described. The camshaft pusher control method includes: selectively setting an intake mode command to one of the following modes: a deactivation mode; a low lift mode; and a high lift mode; based on the intake mode command: selectively drives a first pin of a first spool actuator into a first groove of a first grooved member of an intake camshaft spool, wherein contact between the first pin and the first groove during rotation of an intake camshaft axially displaces the intake camshaft spool in a first direction Intake camshaft slides; and selectively extending a second pin of a second spool actuator into a second groove of an intake camshaft spool, wherein contact between the second pin and the second groove during rotation of the intake camshaft slides the intake camshaft spool axially in a second direction along the intake camshaft. The camshaft pusher control method also includes: determining a last stored indication of the intake mode command; Outputting the command to extend one of the first and second pins to shift the intake camshaft pusher and reach the last stored indication of the intake mode command; based on whether the one of the first and second pens has deployed in response to the command, indicating that a current intake mode is either: (i) the last stored indication of the intake mode command; or (ii) another of the modes is deactivation mode, low lift mode and high lift mode; and updating the inlet mode command to the current inlet mode.

In other embodiments, the camshaft pusher control method includes determining if the one of the first and second pens has deployed based on signals from at least one sensor connected to one of the first and second pens.

In further embodiments, the at least one sensor comprises at least one Hall effect sensor and a counter-electromagnetic force (EMF) sensor.

In further embodiments, the camshaft pusher control method further comprises determining that the one of the first and second pins is extended when a change in the signals is greater than a predetermined value.

In further embodiments, the camshaft pusher control method further comprises: outputting a second command in response to a determination that the one of the first and second pens has deployed in response to the command to extend one of the first and second pens extending one of the first and second pins to shift the intake camshaft pusher and reach the last stored indication of the intake mode command; and indicates that the current intake mode corresponds to the last stored display of the intake mode command if the one of the first and second pins is not extended in response to the second command to extend one of the first and second pins.

In further embodiments, the camshaft pusher control method further comprises: in response to a determination that the one of the first and second pens has deployed in response to the command to extend one of the first and second pens, issue a second command to the one extend the first and second pins to shift the intake camshaft pusher and reach the last stored indication of the intake mode command; and indicates that the current intake mode corresponds to the last stored display of the intake mode command when the one of the first and second pins is extended in response to the second command to extend one of the first and second pins.

In other embodiments, the camshaft pusher control method also includes determining the one of the first and second pens that is deployed based on the last stored indication of the intake mode command.

In one embodiment, a camshaft pusher control method of a vehicle engine is described. The camshaft pusher control method includes: selectively setting an exhaust mode command to one of the following modes: a deactivation mode; a non-deactivation mode; based on the exhaust mode command: selectively extending a first pin of a spool actuator into a first groove of a camshaft spool grooved member, wherein contact between the first pin and the first groove during rotation of an exhaust camshaft slides the exhaust camshaft spool axially in a first direction along the exhaust camshaft; and selectively extending a second pin of the spool actuator into a second groove of the exhaust camshaft grooved member, wherein the contact between the second pin and the second groove during rotation of the exhaust camshaft slides the exhaust camshaft spool axially in a second direction along the exhaust camshaft. The camshaft pusher control method further comprises: determining a last stored indication of the exhaust mode command; Command to extend one of the first and second pins to move the exhaust camshaft pusher and reach the last stored indication of the exhaust mode command; Indicating that a current exhaust mode corresponds to the last stored display of the exhaust mode command if the one of the first and second pins is not extended in response to the command to extend one of the first and second pins.

In further embodiments, the camshaft pusher control method includes determining whether the one of the first and second pens based on signals from at least one sensor, which is connected to one of the first and second pins, is extended.

In further embodiments, the at least one sensor comprises at least one Hall effect sensor and a counter-electromagnetic force (EMF) sensor.

In further embodiments, the camshaft pusher control method further comprises determining that the one of the first and second pins is extended when a change in the signals is greater than a predetermined value.

In further embodiments, the camshaft pusher control method further comprises the current exhaust mode being one of the deactivation and non-deactivation modes when the one of the first and second pins is in response to the command to extend the one of the first and second pins , is extended.

In further embodiments, the camshaft pusher control method further comprises determining the one of the first and second pens that is deployed based on the last stored indication of the exhaust mode command.

Further fields of application of the present disclosure will become apparent from the detailed description, the claims and the drawings. The detailed description and specific examples are merely illustrative and do not limit the scope of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be better understood with the aid of the detailed description and the accompanying drawings, in which:

1 Fig. 10 is a functional block diagram of an exemplary engine control system;

2 Fig. 10 is a functional block diagram including an exemplary cylinder system of an engine;

3 Figure 3 is a functional block diagram including an exemplary part of a slidable intake camshaft;

4 Figure 3 is a functional block diagram including an exemplary part of a sliding exhaust camshaft;

5 a functional block diagram includes an engine control module;

6A - 6B a flow chart with an example method for the determination and verification of a mode of a camshaft slide comprises; and

7 a flowchart with an example method for the determination and verification of a mode of a camshaft slide comprises.

In the drawings the same reference numbers are used for similar and / or identical elements.

DETAILED DESCRIPTION

A camshaft of an engine controls the opening of the valves of an engine. For example, an intake camshaft controls the opening of the intake valves of cylinders, and an exhaust camshaft controls the opening of the exhaust valves of cylinders.

A camshaft spool is coupled to a camshaft and rotates with it. The camshaft slide slides axially along the camshaft to establish engagement of various sets of cam lobes into the valves. For example, an intake camshaft spool may slide along an intake camshaft to engage high lift cam lobes, low lift cam lobes, and deactivation cam lobes in the intake valves of one or more cylinders. An exhaust camshaft pusher may slide along an exhaust camshaft to engage deactivation cam lobes and non-deactivation lift cam lobes (eg, high lift lobes) in exhaust valves of one or more cylinders.

An engine control module (ECM) controls the operation of the camshaft shifters of the engine. At engine shutdown, the ECM stores a commanded operating mode of a camshaft spool. The operating mode indicates which set of cam lugs engage. At engine startup, the ECM determines the stored commanded operating mode of a camshaft spool from a last engine shutdown. However, a current operating mode of the camshaft pusher could be different than the stored operating mode. The ECM thus detects and / or checks the current operating mode of the camshaft spool at engine startup. While the determination / check of the current operation mode is described using the example of the engine start based on the stored operation mode at the last engine shutdown, the determination / verification using the last stored mode may be performed at another time.

With reference to 1 FIG. 12 is a functional block diagram of an exemplary engine control system. FIG 100 shown. An engine 102 generates drive torque for a vehicle. Air is via an intake manifold 104 in an engine 102 sucked. The air flow in the intake manifold 104 can through a throttle 106 be managed. A throttle actuator module 108 (For example, an electronic throttle control) controls the opening of the throttle valve 106 based on signals from an engine control module (ECM) 160 , One or more fuel injectors 110 mix fuel with air to form a combustible fuel / air mixture. A fuel actuator module 112 controls the fuel injector (s) based on signals from the ECM 160 , A cylinder 114 includes a piston (not shown) connected to a crankshaft 116 is coupled. Nevertheless, the engine 102 in 1 with only one cylinder 114 is shown, the engine can 102 contain more than one cylinder (see eg 2 ).

2 is a functional block diagram of an exemplary cylinder system. The motor 102 includes a plurality of cylinders, such as a first cylinder 114-1 , a second cylinder 114-2 , a third cylinder 114-3 and a fourth cylinder 114-4 , Even though 2 four cylinders shows, the engine can 102 contain more or less cylinders.

One or more intake valves are connected to each cylinder. For example, every cylinder is equipped with an inlet valve 118 shown. The opening and closing times of the intake valves are from an intake camshaft 126 regulated. An intake camshaft, such as the intake camshaft 126 , on each cylinder bank of the engine 102 be mounted.

One or more exhaust valves are also connected to each cylinder. For example, every cylinder is equipped with an exhaust valve 120 shown. The opening and closing times of the exhaust valves are controlled by an exhaust camshaft 132 regulated. An exhaust camshaft, such as the exhaust camshaft 132 , on each cylinder bank of the engine 102 be mounted. The rotation of intake camshaft (s) 126 and the exhaust camshaft (s) 132 becomes general from the rotation of the crankshaft 116 driven, for example via a belt or chain drive.

One or more spark plugs may also be connected to each cylinder. 1 includes a spark plug 122 from a cylinder. Air and fuel inside a cylinder can be ignited by sparks from a spark plug. An igniter actuator module 124 controls the spark plugs based on signals from the ECM 160 ,

A cam phaser controls the rotation of an associated camshaft. For example only, the intake cam phaser controls 128 the rotation of the intake camshaft 126 , An exhaust cam phaser 129 regulates the rotation of the exhaust camshaft 132 , An adjuster actuator module 130 can the intake cam adjuster 128 based on signals from the ECM 160 Taxes. An adjuster actuator module 130 or another placer actuator module may be the exhaust cam phaser 129 based on signals from the ECM 160 Taxes.

3 Figure 11 is a functional block diagram including an exemplary intake camshaft slide 126 , While 3 is illustrated and described based on the example of an intake camshaft applies 3 also for an exhaust camshaft.

Referring to 2 and 3 the intake camshaft rotates 126 around a camshaft axis 144 , A slider 204 is with an intake camshaft 126 coupled and turns with this. Cam protrusions of each intake valve of two of the cylinders 114 are with the intake camshaft 126 coupled and turn with this. While 3 based on the example of a two-camshaft spool, a camshaft spool may be used for each cylinder, or a camshaft spool may be used for more than two cylinders. While 3 However, by providing the example of two intake valves per cylinder, each cylinder may include one or more than two intake valves.

A set of three cam tabs is with the slider 204 coupled for each intake valve of each cylinder. For example, the high lift cam lobes and low lift cam lobes for the intake valves 118 of the third cylinder 114-3 and the fourth cylinder 114-4 with the slider 204 coupled. High-lift cam projections are usually through 208 shown, and low-elevation cam lobes are usually through 212 shown. The deactivation cam protrusions are for each intake valve 118 of the third cylinder 114-3 also with the slider 204 coupled. The deactivation cam protrusions are usually through 216 shown. While 3 with the example of two low lift cam lobes per intake valve of the fourth cylinder 114-4 is shown, the fourth cylinder 114-4 have a deactivation cam protrusion for each intake valve, similar to those for the third cylinder 114-3 to be shown. Various possible combinations of high lift, low lift and deactivation cam protrusions may be used for each valve of each cylinder. As another example, one can One cylinder valve may have high lift, low lift and deactivate cam lobes while another valve of the cylinder may have high lift, low lift and low lift cam lobes. In other options, the other valve has high-lift, high-lift, and low-lift cam lobes, or high-lift, low-lift, and high-lift lobes, although there are even more possible examples.

The intake valves 118 be on springs on the intake camshaft 126 (not shown) aligned. Profiles of high-lift and low-lift cam protrusions 208 and 212 cause the opening of the associated inlet valves 118 , The profile of the high lift cam lobes 208 initiates the associated intake valves 118 continue to open (ie, more stroke) and for a longer duration than the profile of the low lift cam lobes 212 , The profile of the deactivation cam projection 216 may be circular (eg, zero stroke) to open and close the intake valves 118 to disable. Exemplary profiles for high-lift, low-lift, and deactivation cam protrusions are also disclosed in U.S. Pat 3 shown.

A first grooved element 220 and a second grooved element 224 are also coupled and rotate with the slider 204 in the example of 3 , The first grooved element 220 includes a groove 228 to move the slider 204 (Including the cam projections and the first and second grooved elements 220 and 224 ) in a first axial direction 232 , The second grooved element 224 includes a groove 236 to move the slider 204 (Including the cam projections and the first and second grooved elements 220 and 224 ) in a second axial direction 240 that of the first axial direction 232 is opposite.

A first slider actuator 244 includes a first pen 248 and a second pen 252 , The first and second pens 248 and 252 can be electrically extended and retracted. Is the slider 204 using the high lift cam lobes 208 for lifting the intake valves 118 positioned, the second pin can 252 in the groove 228 be extended to the slider 204 a first distance in the first axial direction 232 to shift so that the low-lift cam protrusions 212 in the intake valves 118 intervention. In the case of the fourth cylinder 114-4 , in particular, would be the middle set of low-lift cam protrusions 212 engaged with the inlet valves 118 ,

Is the slider 204 using the low-lift cam protrusions 212 for lifting the intake valves 118 positioned, the first pin can be 248 in the groove 228 be extended to the slider 204 a second distance in the first axial direction 232 to shift so that the deactivation cam protrusions 216 in the intake valves 118 of the third cylinder 114-3 engage, as well as the (far right) low-elevation cam lobes 212 in the intake valves 118 of the fourth cylinder 114-4 ,

A second slider actuator 256 includes a third pen 260 and a fourth pen 264 , The third and fourth pins 260 and 264 can be electrically extended and retracted. Is the slider 204 positioned to lift the intake valves 118 of the third cylinder 114-3 , using the deactivation cam protrusions 216 , and the intake valves 118 of the second cylinder 114-1 with the low-lift cam protrusions 212 (far right), then the third pin 260 in the groove 236 be extended to the slider 204 a second distance in the second axial direction 240 to shift so that the low-lift cam protrusions 212 in the intake valves 118 intervention. In the case of the fourth cylinder 114-4 , in particular, would be the middle set of low-lift cam protrusions 212 engaged with the inlet valves 118 , Is the slider 204 positioned to lift the intake valves 118 , using the low-lift cam tabs 212 , then the fourth pen 264 in the groove 236 be extended to the slider 204 a first distance in the second axial direction 240 to shift, so the high-lift cam protrusions 208 in the intake valves 118 intervention.

The timing of the extension of the pens 248 . 252 . 260 and 264 is generally controlled so that the pins engage in the respective grooves to the slider 204 to move. The shifting is generally performed when the cam lobes are the associated intake valves 118 just do not lift. Although in 2 not shown separately, a second slider, cam projections, grooved members and spool actuators for the first and second cylinders 114-1 and 114-2 to be provided. The engine control module 160 controls the slider actuators 244 and 256 as described below.

Each pen can implement one or more sensors. For example, a Hall effect sensor and / or an electromotive force (EMF) sensor, usually by 270 illustrated with the first pen 248 be implemented. A Hall effect sensor and / or an electromotive force (EMF) sensor, usually by 274 illustrated with the second pen 252 be implemented. A Hall effect sensor and / or an electromotive force (EMF) sensor, usually by 278 illustrated with the third pen 260 be implemented. A Hall effect sensor and / or an electromotive force (EMF) sensor, usually by 282 illustrated with the fourth pen 264 be implemented. In various implementations, a sensor for two pins can be provided. The ECM 160 may determine a position of a pen or whether the pen is being moved based on feedback signals from one or more sensors connected to that pen.

4 is a functional block diagram including an exemplary sliding part of the exhaust camshaft 132 , While 4 is illustrated and described based on the example of an exhaust camshaft applies 4 also for an intake camshaft.

Referring to 2 and 4 the exhaust camshaft rotates 132 around a camshaft axis 302 , A slider 304 is with an exhaust camshaft 132 coupled and turns with this. Cam protrusions of each exhaust valve of at least one of the cylinders, for example, the cylinder 114-3 , are coupled and rotate with the exhaust camshaft 132 , While 4 based on the example of a camshaft spool for a cylinder, a camshaft spool can be used for more than two cylinders. While 4 However, by providing the example of two exhaust valves per cylinder, each cylinder may include one or more than two exhaust valves.

A set of two cam projections is with the slider 304 for each of the exhaust valves 120 coupled to the cylinder. The non-deactivation cam protrusions (eg, high lift) and the deactivation cam protrusions for the exhaust valves 120 of the third cylinder 114-3 are for example with the slider 304 coupled. Non-deactivation cam protrusions are usually through 308 shown, and deactivation cam protrusions are usually through 312 shown.

The exhaust valves are placed on the exhaust camshaft via springs 132 (not shown) aligned. The profile of the non-deactivation cam projections 308 causes the opening of the associated exhaust valves 120 , The profile of the deactivation cam projection 312 may be circular (eg, zero stroke) to open and close the exhaust valves 120 to disable. Exemplary profiles for first and deactivation cam protrusions are also shown in FIG 4 shown. A valve (intake or exhaust valve) remains closed throughout an entire revolution of the associated camshaft when it is engaged with a deactivation cam lobe.

A grooved element 320 is in the example of 4 also with the slider 304 coupled and turns with this. The grooved element 320 includes a first groove 328 to move the slider 304 (Including the cam projections and the grooved member 320 ) in a first axial direction 332 , The grooved element 320 also includes a second groove 336 to move the slider 304 (Including the cam projections and the grooved member 320 ) in a second axial direction 340 that of the first axial direction 332 is opposite.

A slider actuator 344 includes a fifth pin 348 and a sixth pen 352 , The fifth and sixth pins 348 and 352 can be extended and retracted, for example via electromechanical electromagnets. Is the slider 304 positioned to lift the exhaust valves 120 using the non-deactivation cam protrusions 308 , then the first pin 348 in the first groove 328 be extended to the slider 304 a distance in the first axial direction 332 to shift so that the deactivation cam protrusions 312 in the exhaust valves 120 intervention. Is the slider 304 for using the deactivation cam protrusions 312 positioned, so can the second pin 352 in the second groove 336 be extended to the slider 304 a distance in the second axial direction 340 to shift, so that the non-deactivation cam protrusions 308 in the exhaust valves 120 of the third cylinder 114-3 intervention.

The timing of the extension of the pens 348 and 352 is generally controlled so that the pins engage in the respective grooves to the slider 304 to move. Pushing is generally performed when the cam lobes are the associated exhaust valves 120 just do not lift (and will not lift). Although in 2 not separately shown, a second slider, cam projections, grooved members and slide actuators for the second cylinder 114-2 to be provided. The ECM 160 controls the slider actuator 344 as described below.

Each pen can implement one or more sensors. For example, a Hall effect sensor and / or an EMF sensor, usually by 370 illustrated with the fifth pen 348 be implemented. A Hall effect sensor and / or an EMF sensor, usually through 374 illustrated with the sixth pen 352 be implemented. The ECM 160 may determine a position of a pen or whether the pen is being moved based on feedback signals from one or more sensors connected to that pen.

5 FIG. 12 is a functional block diagram of an example implementation of the ECM 160 , A torque request module 404 determines a torque request 408 for the engine 102 based on one or more driver inputs 412 and a vehicle speed. The driver inputs 412 can eg ° B. an accelerator pedal position, a brake pedal position, a cruise control input and / or and one or more other appropriate driver inputs. The speed request module 404 can the speed requirement 408 additionally or alternatively, starting from one or more other speed requirements, such. From the ECM 160 generated speed requests and / or received from other vehicle modules speed requirements, such. As a transmission control module, a hybrid control module, a suspension control module, etc., determine.

One or more engine actuators are based on the torque request 408 and / or one or more other parameters. A throttle control module 416 For example, a target throttle opening 420 determine based on the torque request 408 , A throttle actuator module 108 For example, the opening of the throttle 106 based on the target throttle opening 420 ,

In general, a spark control module will detect 424 a Zielzündzeitpunkt 428 based on the torque request 408 , The ignition control module 424 Generates the spark based on the target spark timing 428 , A fuel control module 432 determines one or more desired fueling parameters 436 based on the speed request 408 , The target fuel supply parameters 436 For example, they may include a fuel injection amount, a number of fuel injections for injecting the amount, and the timing for each of the injections. The fuel actuator module 112 controls fuel injection based on the desired fueling parameters 436 ,

An adjuster control module 437 determines the target intake and exhaust cam angle 438 and 439 based on the torque request 408 , An adjuster actuator module 130 may determine the intake and exhaust cam phasers (not shown) based on the target intake and exhaust cam phaser angles, respectively 438 and 439 , A gain control module 440 can determine one or more desired states, for example, the target output 442 based on the speed request 408 , The gain actuator module may control the output of an amplification device (eg, a turbocharger or a compressor) based on the desired output 442 ,

A mode command module 444 generates an inlet mode command 448 and an outlet mode command 450 , At some point, the mode command module can 444 the inlet mode command 448 set to one of the following modes: a low-lift mode; a high lift mode; and a deactivation mode.

During normal engine operation, the mode command module may 444 the inlet mode command 448 based on one or more current engine operating parameters, such as the torque request 408 , the (current) mode command 448 , and / or set one or more other engine operating parameters. When the inlet mode command 448 For example, in low-lift mode, the mode command module may 444 the inlet mode command 448 into the high-lift mode when the torque request 408 elevated. When the inlet mode command 448 in low-lift mode, the mode command module can 444 the inlet mode command 448 into the deactivation mode when the torque request 408 decreased. When the inlet mode command 448 in deactivation mode, the mode command module can 444 the inlet mode command 448 into low lift mode when torque request 408 elevated. When the inlet mode command 448 is in high lift mode, the mode command module 444 the inlet mode command 448 convert to low-lift mode when the torque request 408 decreased.

The mode command module 444 can be the outlet mode command 450 set to one of the following modes: a non-deactivation mode; and a deactivation mode. The mode command module 444 can be the outlet mode command 450 along with the setting of the inlet mode command 448 to adjust. For example, the mode command module 444 the outlet mode command 450 from the deactivation mode to the non-deactivation mode when the inlet mode command 448 switch from deactivation mode to low lift mode. The mode command module 444 can be the outlet mode command 450 from the non-deactivation mode to the deactivation mode when the inlet mode command 448 switch from low lift mode to deactivation mode.

A slider control module 452 controls the extension / retraction of pins of the spool actuators to control the shifting of the spools based on the inlet mode command 448 and the exhaust mode command 450 , For example, if the inlet mode command 448 switch from deactivation mode to low lift mode, the slider control module may 452 the second slider actuator 256 each supplying energy to the third pen 260 in the groove 236 of the second grooved element 224 extend to the use of the deactivation cam protrusions 216 on the use of low-lift cam protrusions 212 switch. When the outlet mode command 450 from deactivation mode to non-deactivation mode, the slider control module may 452 the slider actuator 344 each energize to the sixth pin 352 in the second groove 336 of the grooved element 320 to start using the deactivation cam protrusions 312 on the use of the non-deactivation cam protrusions 308 switch.

When the inlet mode command 448 switch from low lift mode to disable mode, the slider control module can 452 the first slider actuator 244 each energize to the first pin 248 in the groove 228 of the first grooved element 220 extend to the use of the low-lift cam protrusions 212 on the use of the deactivation cam protrusions 216 switch. When the outlet mode command 450 From the non-deactivation mode to the deactivation mode, the slider control module may 452 the slider actuator 344 each energize to the fifth pin 348 in the first groove 328 of the grooved element 320 to extend the use of the non-deactivation cam protrusions 308 on the use of the deactivation cam protrusions 312 switch.

When the inlet mode command 448 switch from low lift mode to high lift mode, the slider control module may 452 the second slider actuator 256 each energize to the fourth pin 264 in the groove 236 of the second grooved element 224 extend to the use of the low-lift cam lugs 212 on the use of high-lift cam protrusions 208 switch. When the inlet mode command 448 switch from high lift mode to low lift mode, the slider control module may 452 the first slider actuator 244 each power it to the second pin 252 in the groove 228 of the first grooved element 220 extend to the use of the high lift cam lugs 208 on the use of low-lift cam protrusions 212 switch.

The mode command module 444 changes the inlet mode command 448 not directly from the high-lift mode to the deactivation mode, or from the deactivation mode directly to the high-lift mode. Instead, the mode command module changes 444 first the inlet mode command 448 to the low lift mode. When the engine shutdown is performed, the mode command module stores 444 the inlet mode command 448 and the exhaust mode command 450 In the storage room 454 , A driver may command the engine shutdown, for example, via one or more ignition keys, buttons, and / or switches.

The commanded modes stored for engine shutdown may be used at the next engine startup after engine shutdown to determine how the disposed intake and exhaust modes 448 and 450 can be changed. A driver may command engine start, for example, via one or more ignition keys, buttons, and / or switches. However, the current mode of a camshaft spool at engine startup may under certain circumstances be different than the commanded mode that was stored at the last engine shutdown. A difference between the current and the commanded modes may result in abnormal engine operation and / or one or more faults.

At engine start, a current module calls 456 the stored commanded (inlet and outlet) modes 460 the last engine shutdown from the memory 454 from. As noted above, the determination / verification of the current operating mode will be described using the example of engine start based on the last engine shutdown stored operating mode, while the determination / verification may be performed at a different time using the last stored mode. A driver may command engine start, for example, via one or more ignition keys, buttons, and / or switches. The current mode module 456 generated for the shift control module 452 test commands 464 to determine a current mode 472 a camshaft slide at engine start. The slider control module 452 controls the pins of the slider actuators based on the test commands 464 , After discovery, the mode command module updates 444 the commanded (inlet or discharge) mode to the current mode 472 for this camshaft pusher. The mode command module 444 can then switch to the commanded mode as discussed above. As discussed below, the current mode module generates 456 the test commands 464 and determines the current mode of a camshaft pusher based on feedback signals 468 from the sensors (eg sensors 270 . 274 . 278 . 282 . 370 , and 374 ) of the pins of the slider actuators, which are connected to the camshaft slide.

6A and 6B include a flow chart illustrating an example method for determining and verifying a current mode of a slider 204 , The controller starts with 504 , For example, the controller after the engine start with 504 begin, for example, when the engine speed is greater than a predetermined Engine speed after engine start. While the example provided the situation after engine start, the determination and verification of the current mode may also be performed at another appropriate time.

at 504 calls the current mode module 456 the saved mode 460 from the store 454 from. The saved mode 460 shows the last saved inlet mode command 448 at. at 508 determines the current mode module 456 whether the stored mode 460 the high-lift mode was. If 508 is correct, the controller moves with 512 continued. If 508 is wrong (ie the saved mode 460 was one of the following modes: low-lift mode; and deactivation mode), the controller continues with 538 ( 6B ), as will be discussed below.

at 512 commands the current mode module 456 the slider control module 452 the fourth pen 264 the second slider actuator 256 in the groove 236 to move out of low-lift mode to high-lift mode. In response to the command, the slider control module applies 452 Power on to the fourth pin 264 at a (rotation) point in time, in which the fourth pin 264 in the groove 236 would be extended and causes a change to high lift mode when the low lift mode is currently in use (as opposed to the high lift mode as indicated by the stored mode 460 ).

The current mode module 456 determines if the fourth pen 264 at 516 is extended, based on the feedback signals from the sensors 282 , The current mode module 456 For example, determine that the fourth pen 264 is extended when the feedback signals from the sensors 282 change by at least a predetermined amount. If 516 is wrong (ie the fourth pen 264 is not extended), then shows the current mode module 456 on that the current mode 472 the high-lift mode at 520 is. In this case, the fourth pen is 264 due to the contacting (of the non-grooved portion) of the second grooved element 224 not extended. The mode command module 444 sets the inlet mode command 448 at 520 on the current inlet mode 472 one. The mode command module 444 may be the inlet mode command 448 change later during the investigation. If 516 is wrong (ie the fourth pen 264 is extended), the controller moves with 524 continued. In this case, either: (1) the fourth pen 264 is in the groove 236 extended and caused a change in the high-lift mode; or (2) the deactivation mode was in operation.

at 524 commands the current mode module 456 for the second time the slider control module 452 the fourth pen 264 the second slider actuator 256 in the groove 236 to move out of low-lift mode to high-lift mode. In response to the command, the slider control module applies 452 Power on to the fourth pin 264 at a (rotation) point in time, in which the fourth pin 264 in the groove 236 would extend and cause a change to high lift mode if the low lift mode was currently in use.

at 528 determines the current mode module 456 again, whether the fourth pin 264 is extended, based on the feedback signals from the sensors 282 , The current mode module 456 For example, determine that the fourth pen 264 is extended when the feedback signals from the sensors 282 to change by at least the predetermined amount. In this case, the fourth pen would be 264 extend because the deactivation mode is in use. The fourth pen 264 would due to the contacting (the non-grooved portion) of the second grooved element 224 not extended. If 528 is wrong (ie the fourth pen 264 is not extended), then shows the current mode module 456 on that the current mode 472 the high-lift mode at 520 is. If 528 is wrong (ie, the fourth pen 264 is extended), then shows the current mode module 456 on that the current mode 472 the deactivation mode 536 is. The mode command module 444 sets the inlet mode command 448 at 532 or at 536 to the current mode 472 one. The mode command module 444 may be the inlet mode command 448 change later during the investigation.

If 508 ( 6A ) is wrong (ie the saved mode 460 was one of the following modes: low-lift mode; and deactivation mode), the controller continues with 538 ( 6B ), as discussed above. at 538 commands the current mode module 456 the slider control module 452 the second pen 252 of the first slider actuator 244 in the groove 228 to move out of high-lift mode to low-lift mode. In response to the command, the slider control module applies 452 Power on to the second pin 252 at a (rotation) time extend, in which the second pin 252 in the groove 228 would extend and cause a change to low lift mode if the high lift mode was currently in use.

The current mode module 456 determines if the second pin 252 at 540 is extended, based on the feedback signals from the sensors 274 , The current mode module 456 For example, determine that the second pen 252 is extended when the feedback signals from the sensors 274 change by at least a predetermined amount. If 540 is wrong (ie the second pen 252 is not extended), then shows the current mode module 456 that the current mode 472 the low lift mode at 520 is. In this case, the second pen is 252 due to contacting (the non-grooved portion) of the first grooved element 220 not extended. The mode command module 444 sets the inlet mode command 448 at 544 on the current inlet mode 472 one. The mode command module 444 may be the inlet mode command 448 change later during the investigation. If 540 is wrong (ie the second pen 252 is extended), the controller moves with 548 continued. In this case, either: (1) the second pin 252 is in the groove 228 extended and caused a change from the high-lift mode to the low-lift mode; or (2) the deactivation mode was in operation.

at 552 commands the current mode module 456 for the second time the slider control module 452 the second pen 252 of the first slider actuator 244 in the groove 228 to move out of high-lift mode to low-lift mode. In response to the command, the slider control module applies 452 Power on to the second pin 252 at a (rotation) time extend, in which the second pin 252 in the groove 228 would extend and cause a change to low lift mode if the high lift mode was currently in use.

at 552 determines the current mode module 456 again, whether the second pin 252 is extended, based on the feedback signals from the sensors 274 , The current mode module 456 For example, determine that the second pen 252 is extended when the feedback signals from the sensors 274 to change by at least the predetermined amount. In this case, the second pen would be 252 extend because the deactivation mode is in use. The second pen 252 would due to the contacting (of the non-grooved portion) of the first grooved element 220 do not extend. If 552 is wrong (ie the second pen 252 is not extended), then shows the current mode module 456 on that the current mode 472 the low lift mode at 556 is. If 552 is correct (ie the second pen 252 is extended), then shows the current mode module 456 on that the current mode 472 the deactivation mode 560 is. The mode command module 444 sets the inlet mode command 448 at 556 or at 560 to the current mode 472 one. The mode command module 444 may be the inlet mode command 448 change later during the investigation.

While 6A and 6B with regard to the slider 204 can be explained 6A and 6B for any other intake spool actuator of the engine 102 be performed. Although the use of the slider 204 in conjunction with the intake camshaft 126 illustrated and described, the slider could 204 can also be used in conjunction with an exhaust camshaft. As used herein, a non-deployed pin refers to a pin that is not fully extended as if it were extended into a groove. A pin that extends only partially, for example because of the gap between the pins (when retracted) and a grooved member, is considered to be non-deployed.

7 FIG. 12 is a flowchart showing an example method of detecting and verifying a current mode of the slider 304 , The controller starts with 604 , For example, the controller after the engine start with 604 for example, when the engine speed is greater than a predetermined engine speed after engine start. While the example provided the situation after engine start, the determination and verification of the current mode may also be performed at another appropriate time.

at 604 calls the current mode module 456 the saved mode 460 of the slider 304 from the store 454 from. The saved mode 460 shows the last stored exhaust mode command 450 at. Because the slider 304 has two sets of cam lobes for each exhaust valve, either the deactivation mode; or the non-deactivation mode. The non-deactivation mode corresponds to operation using the non-deactivation cam protrusions 308 while the deactivation mode is operating by means of the deactivation cam protrusions 312 equivalent.

at 608 determines the current mode module 456 whether the stored mode 460 was the non-deactivation mode. If 608 is correct, the controller moves with 612 continued. If 608 is wrong (ie the saved mode 460 was the deactivation mode), the controller drives with 628 as will be discussed further below.

at 612 commands the current mode module 456 the slider control module 452 the sixth pen 352 the slider actuator 344 in the second groove 336 to go from deactivation mode to non-deactivation mode. In response to the command, the slider control module applies 452 Power on to the sixth pin 352 at a (turn) point in time, where the sixth pin 352 in the second groove 336 would exit and cause a change to the non-deactivation mode if the deactivation mode was currently used (as opposed to the non-deactivation mode as indicated by the stored mode 460 ).

The current mode module 456 determines if the sixth pen 352 at 616 is extended, based on the feedback signals from the sensors 374 , The current mode module 456 For example, you can determine that the sixth pen 352 is extended when the feedback signals from the sensors 374 change by at least a predetermined amount. If 616 is correct (ie the sixth pen 352 is extended), shows the current mode module 456 on that the current mode 472 the non-deactivation mode 620 is. In this case, the sixth pen is 352 extended and causes a change to non-deactivation mode. If 616 is wrong (ie the sixth pen 352 is not extended), shows the current mode module 456 on that the current mode 472 the non-deactivation mode 624 is. In this case, the sixth pen is 352 due to the contacting (of the non-grooved portion) of the grooved element 320 not extended. If 608 is wrong (ie the saved mode 460 was the deactivation mode), the controller drives with 628 as discussed above. at 628 commands the current mode module 456 the slider control module 452 the fifth pen 348 the slider actuator 344 in the first groove 328 to exit to the non-deactivation mode to the deactivation mode. In response to the command, the slider control module applies 452 Power on to the fifth pin 348 at a (rotation) point in time, where the fifth pin 348 in the first groove 328 would exit and cause a change to deactivation mode if the non-deactivation mode was currently in use. The current mode module 456 determines if the fifth pen 348 at 632 is extended, based on the feedback signals from the sensors 370 , The current mode module 456 For example, determine that the fifth pen 348 is extended when the feedback signals from the sensors 370 change by at least a predetermined amount. If 632 is correct (ie the fifth pen 348 is extended), then shows the current mode module 456 on that the current mode 472 the deactivation mode 536 is. In this case, the fifth pen is 348 in the first groove 328 extended and causes a change to deactivation mode. If 632 is wrong (ie the fifth pen 348 is not extended), then shows the current mode module 456 on that the current mode 472 the deactivation mode 640 is. The mode command module 444 sets the outlet mode command 450 for the slider 304 at 620 . 624 . 636 or at 640 to the current mode 472 one. The mode command module 444 may later issue the exhaust mode command during the determination 450 switch to the other of the two modes.

While 7 with regard to the slider 304 has been explained 7 for any other exhaust spool actuator of the engine 102 be performed. Although the use of the slider 304 in conjunction with the exhaust camshaft 132 illustrated and described, the slider could 304 also be used in conjunction with an intake camshaft.

The foregoing description is merely illustrative and is not in any way intended to limit the present disclosure or its applications or uses. The comprehensive teachings of Revelation can be implemented in many forms. Thus, while the present disclosure includes particular examples, the true scope of the disclosure is not in any way limited thereby, and other modifications will become apparent from a study of the drawings, the specification, and the following claims. It should be understood that one or more steps within a method may be performed in a different order (or concurrently) without altering the principles of the present disclosure. Further, although each of the embodiments is described above as having certain features, one or more of these functions described with respect to each embodiment of the disclosure may be implemented and / or combined in any of the other embodiments themselves if this combination is not explicitly described. In other words, the described embodiments are not mutually exclusive, and permutations of one or more embodiments against each other remain within the scope of this disclosure.

Spatial and functional relationships between elements (eg, between modules, circuit elements, semiconductor layers, etc.) are described using various terms including "connected,""engaged,""coupled,""adjacent,""adjacent"," Above "," above "," below "and" arranged ". Unless expressly described as "direct", a relationship may be a direct relationship when a relationship between a first and second element is described in the above disclosure, if there are no other intervening elements between the first and second elements, but may also be an indirect relationship if one or more intervening elements (either spatial or functional) exist between the first and second elements. As used herein, the set of at least one of A, B, and C should be understood to mean logic (A OR B OR C) using a non-exclusive logical OR, and should not be construed as meaning that means "at least one of A, at least one of B and at least one of C. "

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 or include the following: 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 (shared, dedicated, or group) executing code; a memory (shared, dedicated, or group) that stores a code executed by a processor; other suitable hardware components that provide the described functionality; or a combination of some or all of the above, such as in a system-on-chip.

The module may also 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 the modules mentioned in this disclosure can be distributed among several modules connected to interface circuits. Example: Several modules can allow load balancing. In another example, certain functions of a client module may be taken over by a server module (eg, remote server or cloud).

The term code, as used above, may include software, firmware, and / or microcode, and may refer to programs, routines, functions, classes, data structures, and / or objects. The term "common processor circuit" refers to a single processor circuit that executes particular or complete code from multiple modules. The term "clustered processor circuit" refers to a processor circuit that, in combination with additional processor circuits, executes particular or complete code from possibly multiple modules. References to multiple processor circuits include multiple processor circuits on discrete arrays, multiple processor circuits on a single die, multiple cores on a single processor circuit, multiple threads of a single processor circuit, or a combination of the above. The term "shared memory circuit" refers to a single memory circuit that stores particular or complete code from multiple modules. The term "grouped memory circuit" refers to a memory circuit that, in combination with additional memory, stores particular or complete code from possibly multiple modules.

The term "memory circuit" is subordinate to the term "computer-readable medium". The term "computer-readable medium" as used herein does not refer to transitory electrical or electromagnetic signals that propagate in a medium (eg, in the case of a carrier wave); the term "computer-readable medium" is therefore to be understood as tangible and non-transitory. Non-limiting examples of a non-transitory, tangible, computer-readable medium are nonvolatile memory circuits (eg, flash memory circuits, erasable programmable ROM circuits, or mask ROM circuits), volatile memory circuits (eg, static or dynamic RAM). Circuits), magnetic storage media (eg analogue or digital magnetic tape or a hard disk drive) and optical storage media (eg CD, DVD or Blu-ray).

The apparatus and methods described herein may be implemented in part or in full with a dedicated computer configured to perform certain computer program functions. The functional blocks, flowchart components, and other elements described above serve as software specifications that can be translated into computer programs by trained technicians or programmers.

The computer programs include processor executable instructions stored on at least one non-transitory tangible computer-readable medium. The computer programs may also contain stored data or be based on stored data. The computer programs may include a Basic Input Output System (BIOS) that interacts with the special computer hardware, device drivers that interact with particular special computer devices, one or more operating systems, user applications, background services, background applications, and so on.

The computer programs may include: (i) description text that is parsed, such as HTML (hypertext markup language) or XML (extensible markup language), (ii) assembler code, (iii) object code derived from source code of a Compiler, (iv) source code for execution by an interpreter, (v) source code for compilation and execution by a just-in-time compiler, and so forth. By way of example only, source code having a syntax of languages such as C, C ++, C #, Objective C, Haskell, Go, SQL, R, Lisp, Java ^®, Fortran, Perl, Pascal, Curl, OCaml, Javascript ^®, HTML5, Ada, ASP (active server pages), PHP, Scala, Eiffel, Smalltalk, Erlang, Ruby, ^Flash® , Visual ^Basic® , Lua and ^Python® .

None of the elements mentioned in the claims is as "Means for a function" (so-called "means plus function") according to 35 USC §112 (f) unless an item is expressly described using the term "means for" or if the terms "operation for" or "step for" are used in a method claim.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• "Means for a function" (so-called "means plus function") according to 35 USC §112 (f) [0108]

Claims (8)

A camshaft pusher control method for a vehicle, comprising: selectively setting an intake mode command to one of the following modes: a low lift mode; and a high lift mode; based on the inlet mode command: selectively extending a first pin of a first poppet actuator into a first groove of a first grooved member of an intake camshaft pusher, wherein contact between the first pin and the first groove during rotation of an intake camshaft pushes the intake camshaft pusher axially in a first direction along the intake camshaft; and selectively extending a second pin of a second poppet actuator into a second groove of a second grooved member of an intake camshaft pusher, wherein contact between the second pin and the second groove during rotation of an intake camshaft pushes the intake camshaft pusher axially in a second direction along the intake camshaft; Determining a last stored indication of the inlet mode command; Controlling the extension of one of the first and second pins to shift the intake camshaft pusher and reach the last stored indication of the intake mode command; Based on whether one of the first and second pens extends in response to the command, indicate that a current mode is either: (i) the last stored indication of the intake mode command; or (ii) another is the deactivation, small lift and high lift modes; and Update the inlet mode command to the current inlet mode. The camshaft spool control method of claim 1, further comprising determining if the one of the first and second pins is extended based on signals from at least one sensor connected to one of the first and second pins. A camshaft pusher control method according to claim 2, wherein said at least one sensor includes at least one Hall effect sensor and a back electromagnetic force (EMF) sensor. The camshaft spool control method of claim 3, further comprising determining that the one of the first and second pins is extended when a change in the signals is greater than a predetermined value. A camshaft pusher control method according to claim 1, further comprising: in response to a determination that the one of the first and second pins has extended, in response to the command to extend one of the first and second pins, outputting a second command to extend the one of the first and second pins Shift intake camshaft shifter and reach the last stored indication of the intake mode command; and Indicating that the current mode is the last stored indication of the inlet mode command if the one of the first and second pins is not extended in response to the second command to extend the one of the first and second pins. A camshaft pusher control method according to claim 1, further comprising: in response to a determination that the one of the first and second pins has extended, in response to the command to extend one of the first and second pins, outputting a second command to extend the one of the first and second pins Shift intake camshaft shifter and reach the last stored indication of the intake mode command; and Indicating that the current mode is the last stored indication of the inlet mode command when the one of the first and second pins is extended in response to the second command to extend the one of the first and second pins. The camshaft spool control method of claim 1, further comprising determining the one of the first and second pins that is extended based on the last stored indication of the inlet mode command. A camshaft pusher control method for a vehicle, comprising: selectively setting an exhaust mode command to one of the following modes: a deactivation mode; a non-deactivation hub mode; based on the exhaust mode command: selectively extending a first pin of a spool actuator into a first groove of a camshaft spool grooved member, wherein contact between the first pin and the first groove during rotation of an exhaust camshaft displaces the exhaust camshaft spool axially in a first direction along the exhaust camshaft; and selectively extending a second pin of a spool actuator into a second groove of a grooved exhaust camshaft spool member wherein contact between the second pin and the second groove during rotation of the exhaust camshaft displaces the exhaust camshaft spool axially in a second direction along the exhaust camshaft; Determining a last stored indication of the exhaust mode command; Commanding the extension of one of the first and second pins to shift the exhaust camshaft pusher and reach the last stored indication of the exhaust mode command; indicate that a current exhaust mode is the last stored display of the exhaust mode command if the one of the first and second pins is not extended in response to the command to extend one of the first and second pins; and updating the exhaust mode command to the current exhaust mode.

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