CN112901762B - Sound wave adjusting method and system for automatic gearbox - Google Patents
Sound wave adjusting method and system for automatic gearbox Download PDFInfo
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- CN112901762B CN112901762B CN202110049772.4A CN202110049772A CN112901762B CN 112901762 B CN112901762 B CN 112901762B CN 202110049772 A CN202110049772 A CN 202110049772A CN 112901762 B CN112901762 B CN 112901762B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/0006—Vibration-damping or noise reducing means specially adapted for gearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/0006—Vibration-damping or noise reducing means specially adapted for gearings
- F16H2057/0012—Vibration-damping or noise reducing means specially adapted for gearings for reducing drive line oscillations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
The invention provides a sound wave adjusting method and system for an automatic gearbox, and relates to the technical field of engines of vehicles. The sound wave adjusting method comprises the following steps: acquiring gear information of a vehicle and the current rotating speed of an engine; judging whether the vehicle has a gear reduction requirement or not according to the gear information and the current rotating speed; if so, acquiring the actual inertia torque of the engine of the vehicle and the current required torque of the engine; acquiring a fire path request increasing torque according to the actual inertia torque and the required torque; correcting the required torque and the actual inertia torque to obtain a gas path request increasing torque; and controlling the engine to work according to the torque requested to be increased by the fire path and the torque requested to be increased by the air path. The sound wave adjusting method provided by the invention can build motion sound waves when the vehicle is downshifted.
Description
Technical Field
The invention relates to the technical field of vehicle engines, in particular to a sound wave adjusting method and system for an automatic gearbox.
Background
In an automotive powertrain, a transmission is responsible for transmitting power. During the gear-shifting process of the gearbox, the engine speed is lower after the gear-shifting process is carried out due to the fact that the engine speed of the low gear is higher, and the process is called a speed regulation process. During the speed regulation process, the engine speed has a delta n variation, and inertia torque of T ═ k × J ×. DELTA n/DELTA T is generated (k is a coefficient, J is a rotational inertia, and DELTA T is a speed regulation time). If the torque coordination processing is not carried out, the part of inertia torque can be transmitted to the vehicle through a transmission system in the gear-shifting process, the obvious acceleration feeling is generated in the gear-shifting process, and the gear-shifting quality is poor. Similarly, in the process of downshifting of the gearbox, the gearbox is lowered from a high gear to a low gear, the rotating speed of the engine is regulated from a low level to a high level, the lost inertia torque is also transmitted to the vehicle through the transmission system, and the vehicle has obvious dragging feeling. Therefore, in a general gear shifting process, the transmission controller sends a torque reduction request to the engine controller when shifting up, and starts a torque increase request when shifting down, and the engine controller accurately responds by controlling the torque so as to eliminate the influence of inertia torque and achieve the purpose of smooth gear shifting.
The engine control unit typically implements torque response in two ways, a fire path and a gas path. The fire path is also called as quick torque, which means that an engine controller controls the torque to be quickly reduced by adjusting the ignition angle of the engine, and the mode has the characteristic of quick response; the gas circuit is also called slow torque, which means that an engine controller regulates air entering the engine to participate in combustion by controlling the opening of a throttle valve, and finally the torque following torque target is realized.
On some sports cars, a sound wave valve is installed in the exhaust line for creating the sports atmosphere of the vehicle. In the gear-up process, the gearbox controller only requests a fire path to reduce torque, the engine delays an ignition angle to respond to the torque reduction request of the gearbox by keeping larger gas path torque, mixed gas generates a backward mixture after the ignition angle is delayed, and high-pressure waste gas rushes through the sound wave valve to generate a puff sound, so that sound waves in the gear-up process are realized. During sliding downshift, braking downshift or manual downshift, the transmission controller sends a torque increasing request, but in the internal processing process of the transmission, the gas circuit of a torque increasing signal is not distinguished from the fire circuit, so that the engine controller responds according to the fact that the gas circuit torque is equal to the fire circuit torque in the torque coordination process, mixed gas is completely combusted in the cylinder basically, when waste gas passes through the sound wave valve, the energy is insufficient, sound cannot be excited, the sound quality feeling of the gear increasing is inconsistent, and the driving experience is affected.
Disclosure of Invention
It is an object of a first aspect of the present invention to provide a method of automatic transmission sound wave regulation that is capable of creating a sporty sound wave when the vehicle is downshifted.
It is a further object of the first aspect of the present invention to provide a method of sound wave regulation for an automatic transmission that achieves flexible control of gas path torque requests for driving modes and different rotational speeds.
It is an object of a second aspect of the present invention to provide an automatic transmission sound wave regulation system that is capable of generating a motion sound wave when a vehicle is downshifted.
According to the first aspect described above, the present invention provides a sound wave adjusting method for an automatic transmission, comprising:
acquiring gear information of a vehicle and the current rotating speed of an engine;
judging whether the vehicle has a gear reduction requirement or not according to the gear information and the current rotating speed;
if so, acquiring the actual inertia torque of the engine of the vehicle and the current required torque of the engine;
acquiring a fire path request increasing torque according to the actual inertia torque and the required torque;
correcting the required torque and the actual inertia torque to obtain a gas path request increasing torque;
and controlling the engine to work according to the torque requested to be increased by the fire path and the torque requested to be increased by the air path.
Optionally, the step of correcting the required torque and the actual inertia torque to obtain the gas path requested torque comprises:
collecting a driving mode of the vehicle;
performing linear interpolation table look-up according to the driving mode and the current rotating speed to obtain an amplification factor m and an offset p;
and correcting the actual inertia torque and the required torque by using an amplification coefficient m and an offset p to obtain the gas path request increasing torque.
Optionally, obtaining the required increase torque of the fire path according to the actual inertia torque and the required torque includes:
and adding the actual inertia torque and the required torque to obtain the required torque of the fire path.
Optionally, the gas path requested torque increase is obtained according to the following formula:
Tgas circuit＝Tv+T×m+p；
Wherein, TGas circuitIncreasing torque, T, for gas path requestsvFor the required torque, T is the actual inertia torque, m is the amplification factor, and p is the offset.
According to the second aspect described above, the present invention also provides a sound wave adjusting system for an automatic transmission, comprising:
the acquisition unit is used for acquiring gear information of a vehicle and the current rotating speed of an engine;
the gearbox controller is connected with the engine controller and used for judging whether the vehicle has a gear-down requirement or not according to the gear information and the current rotating speed, acquiring the actual inertia torque of the engine of the vehicle and the current required torque of the engine when the vehicle has the gear-down requirement, acquiring the fire path request increasing torque according to the actual inertia torque and the required torque, and correcting the required torque and the actual inertia torque to obtain the gas path request increasing torque;
and the engine controller is used for controlling the engine to work according to the torque increase requested by the fire path and the torque increase requested by the air path.
Optionally, the collecting unit is further configured to collect a driving mode of the vehicle;
and the gearbox controller is also configured to perform linear interpolation table look-up according to the driving mode and the current rotating speed to obtain an amplification factor m and an offset p, and correct the actual inertia torque and the required torque by using the amplification factor m and the offset p to obtain the gas path request increased torque.
Optionally, the transmission controller is further configured to add the actual inertia torque and the required torque to obtain the required torque of the fire path.
Optionally, the transmission controller is further configured to obtain the gas path requested increased torque according to the following formula:
Tgas circuit＝Tv+T×m+p；
Wherein, TGas circuitIncreasing torque, T, for gas path requestsvFor the required torque, T is the actual inertia torque, m is the amplification factor, and p is the offset.
Optionally, the engine controller is connected with the transmission controller through a CAN signal.
Optionally, the gas path requested torque increase is less than the gas path requested torque increase.
The method for adjusting the sound waves of the automatic gearbox comprises the steps of firstly collecting required information including gear information and the current rotating speed of an engine, judging whether a vehicle has a downshift requirement or not according to the information, if so, further obtaining the actual inertia torque of the engine and the current required torque of the engine, and further obtaining a fire path request increasing torque and an air path request increasing torque according to the actual inertia torque and the required torque, wherein the air path request increasing torque is obtained after correction, and finally controlling the engine to work according to the fire path request increasing torque and the air path request increasing torque. The downshift requirement comprises downshift triggered by sliding, braking downshift and manual downshift, the engine torque can be used as actual output according to the fact that large gas circuit torque is matched with small fire circuit torque in the downshift process, afterburning is achieved by delaying an ignition angle, high-pressure high-energy gas is generated to rush through a sound wave valve to excite gear shifting sound waves, and driving experience is improved.
Further, when the gas circuit request torque increase is corrected, a driving mode needs to be determined, and an amplifying system m and an offset p for correcting the gas circuit request torque increase are obtained according to the driving mode and a current rotating speed table of the engine. In some preferred embodiments, when the operating conditions of the vehicle are satisfied: when the driving mode is the motion mode and has the downshift requirement, the gas circuit request torque increase is corrected, so that the fire circuit and gas circuit torques are distinguished under the specific working condition, the engine responds to the fire circuit request torque increase and the gas circuit request torque increase of the gearbox through torque coordination, timely and accurate response can be guaranteed, certain motion experience feeling can be created, and flexible control over the gas circuit torque requests in the driving mode and at different rotating speeds is achieved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a block flow diagram of a method of sound wave regulation for an automatic transmission according to one embodiment of the present invention;
FIG. 2 is a block flow diagram of a method of sound wave regulation for an automatic transmission according to another embodiment of the present invention;
fig. 3 is a block diagram of a sound wave adjusting system for an automatic transmission according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
In the current torque increasing control logic of the transmission, an attempt to distinguish gas circuit torque from fire circuit torque requests is not made, and the existing technical scheme can only ensure the gear shifting function and the gear shifting quality and is not considered in combination with the driving pleasure.
Fig. 1 is a block flow diagram of a method of sound wave regulation for an automatic transmission according to an embodiment of the present invention. As shown in fig. 1, the present invention provides a sound wave adjusting method for an automatic transmission, which generally includes:
s10: acquiring gear information of a vehicle and the current rotating speed of an engine;
s20: judging whether the vehicle has a downshift requirement or not according to the gear information and the current rotating speed;
s30: if yes, acquiring the actual inertia torque of the engine of the vehicle and the current required torque of the engine;
s40: acquiring a fire path request increasing torque according to the actual inertia torque and the required torque;
s50: correcting the required torque and the actual inertia torque to obtain a gas path request increasing torque;
s60: and controlling the engine to work according to the torque increase requested by the fire path and the torque increase requested by the air path.
The method for adjusting the sound waves of the automatic transmission provided by the embodiment firstly acquires required information including gear information and the current rotating speed of the engine, judges whether the vehicle has a downshift requirement according to the information, further acquires the actual inertia torque of the engine and the current required torque of the engine if the vehicle has the downshift requirement, and further acquires a fire path request increasing torque and a gas path request increasing torque according to the actual inertia torque and the required torque, wherein the gas path request increasing torque is obtained after correction, and finally controls the engine to work according to the fire path request increasing torque and the gas path request increasing torque. The downshift requirement comprises downshift triggered by sliding, braking downshift and manual downshift, the engine torque can be used as actual output according to the fact that large gas circuit torque is matched with small fire circuit torque in the downshift process, afterburning is achieved by delaying an ignition angle, high-pressure high-energy gas is generated to rush through a sound wave valve to excite gear shifting sound waves, and driving experience is improved.
Further, after the improvement, when the accelerator is stepped on in the downshift process to generate an acceleration demand, the engine already responds to part of the gas path torque, so that the torque of the engine is faster to build and the subjective experience is better compared with that before the improvement.
Fig. 2 is a block flow diagram of a method of sound wave regulation for an automatic transmission according to another embodiment of the present invention. As shown in fig. 2, in a specific embodiment, the correcting the required torque and the actual inertia torque to obtain the gas path requested increase torque includes:
s51: collecting a driving mode of a vehicle;
s52: performing linear interpolation table lookup according to the driving mode and the current rotating speed to obtain an amplification factor m and an offset p;
s53: and correcting the required torque and the actual inertia torque by using an amplification factor m and an offset p to obtain the gas path request increasing torque.
In the embodiment, when the gas circuit request torque increase is corrected, a driving mode needs to be determined, and the amplifying system m and the offset p for correcting the gas circuit request torque increase are obtained according to the driving mode and a current rotating speed table of the engine. In some preferred embodiments, when the operating conditions of the vehicle are satisfied: when the driving mode is the motion mode and has the downshift requirement, the gas circuit request torque increasing is corrected, so that the fire circuit torque and the gas circuit torque are distinguished under the specific working condition, the engine responds to the fire circuit request torque increasing and the gas circuit request torque increasing of the gearbox through torque coordination, timely and accurate response can be guaranteed, certain motion experience feeling can be created, and flexible control over the gas circuit torque requests of the driving mode and different rotating speeds is achieved.
In a specific embodiment, obtaining the required increase torque of the fire path based on the actual inertia torque and the required torque comprises:
and adding the actual inertia torque and the required torque to obtain the required torque of the fire path.
In one particular embodiment, the pneumatic circuit requested torque increase is obtained according to the following equation (1):
Tgas circuit＝Tv+T×m+p (1)
Wherein, TGas circuitIncreasing torque, T, for gas path requestsvIn order to obtain the required torque, T is the actual inertia torque, m is the amplification factor, and p is the offset.
Fig. 3 is a block diagram of a sound wave adjusting system for an automatic transmission according to an embodiment of the present invention. The present invention also provides a sound wave regulation system for an automatic transmission, generally comprising a pick-up unit 10, a transmission controller 20 and an engine controller 30, as shown in fig. 3. The acquisition unit 10 is used for acquiring gear information of a vehicle and the current rotating speed of an engine. The transmission controller 20 is connected with the engine controller 30, and the transmission controller 20 is configured to determine whether the vehicle has a downshift requirement according to the gear information and the current rotation speed, acquire an actual inertia torque of an engine of the vehicle and a current required torque of the engine when the vehicle has the downshift requirement, acquire a fire path request increase torque according to the actual inertia torque and the required torque, and correct the required torque and the actual inertia torque to obtain a gas path request increase torque. An engine controller 30 and a transmission controller 20, the engine controller 30 is used for controlling the engine to work according to the fire path request torque increase and the air path request torque increase.
The method for adjusting the sound waves of the automatic transmission provided by the embodiment firstly acquires required information including gear information and the current rotating speed of the engine, judges whether the vehicle has a downshift requirement according to the information, further acquires the actual inertia torque of the engine and the current required torque of the engine if the vehicle has the downshift requirement, and further acquires a fire path request increasing torque and a gas path request increasing torque according to the actual inertia torque and the required torque, wherein the gas path request increasing torque is obtained after correction, and finally controls the engine to work according to the fire path request increasing torque and the gas path request increasing torque. The downshift requirement comprises downshift triggered by sliding, braking downshift and manual downshift, the engine torque can be used as actual output according to the fact that large gas circuit torque is matched with small fire circuit torque in the downshift process, afterburning is achieved by delaying an ignition angle, high-pressure high-energy gas is generated to rush through a sound wave valve to excite gear shifting sound waves, and driving experience is improved.
Further, after the improvement, when the accelerator is stepped on in the downshift process to generate an acceleration demand, the engine already responds to part of the gas path torque, so that the torque of the engine is faster to build and the subjective experience is better compared with that before the improvement.
In a particular embodiment, the acquisition unit 10 is also used for acquiring the driving pattern of the vehicle. The transmission controller 20 is further configured to perform linear interpolation table lookup according to the driving mode and the current rotation speed to obtain an amplification factor m and an offset p, and correct the required torque and the actual inertia torque by using the amplification factor m and the offset p to obtain the gas path requested torque increase.
In the embodiment, when the gas circuit request torque increase is corrected, a driving mode needs to be determined, and the amplifying system m and the offset p for correcting the gas circuit request torque increase are obtained according to the driving mode and a current rotating speed table of the engine. In some preferred embodiments, when the operating conditions of the vehicle are satisfied: when the driving mode is the motion mode and has the downshift requirement, the gas circuit request torque increasing is corrected, so that the fire circuit torque and the gas circuit torque are distinguished under the specific working condition, the engine responds to the fire circuit request torque increasing and the gas circuit request torque increasing of the gearbox through torque coordination, timely and accurate response can be guaranteed, certain motion experience feeling can be created, and flexible control over the gas circuit torque requests of the driving mode and different rotating speeds is achieved.
In one particular embodiment, the transmission controller 20 is further configured to add the actual inertia torque and the requested torque to obtain the flare request increase torque.
In one particular embodiment, the transmission controller 20 is further configured to derive the pneumatic circuit requested torque multiplication according to the following equation (1):
Tgas circuit＝Tv+T×m+p (1)
Wherein, TGas circuitIncreasing torque, T, for gas path requestsvFor the required torque, T is the actual inertia torque, and m is the releaseLarge coefficient, p is the offset.
In one particular embodiment, the engine controller 30 is in signal communication with the transmission controller 20 via a CAN.
In a particular embodiment, the gas path requested increased torque is less than the gas path requested increased torque.
In a specific embodiment, the prior art is compared with the present invention by taking the vehicle gear-down from fourth gear to third gear as an example. In the prior art, when a vehicle is shifted down from a fourth gear to a third gear, a transmission controller sends a torque request (for example, 15Nm) of a, the air path request torque increase and the fire path request torque increase are both the values, after the engine controller receives the requests, the engine controller controls a throttle valve to open a certain opening a, controls an ignition angle according to an optimal ignition angle b, and enables mixed gas to be completely combusted in a cylinder, the engine outputs torque a, and the transmission finishes gear shifting and speed regulation. According to the scheme provided by the invention, when the vehicle is shifted from the fourth gear to the third gear, the gas circuit request torque increase is corrected by the gearbox controller to obtain A1(A1 is larger than A), and the air path request increasing torque A1 and the fire path request increasing torque A are sent to an engine controller, the engine controller controls the throttle valve to open a certain opening a1 after receiving the request (a1 is larger than a, at the moment, if the engine is ignited according to the optimal ignition angle, the engine outputs the torque of A1), at the same time, in response to a transmission flame request to increase torque a, the engine controller needs to back-off firing angle b to b1 so that the engine still has a torque output, but because the firing angle is pushed back, when the exhaust valve is opened, the mixed gas is still in combustion state, i.e. after-combustion is realized, and the high-pressure waste gas rushes through the sound wave valve to generate a puff sound, thereby realizing the sound wave in the downshift process.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A sound wave adjustment method for an automatic transmission, comprising:
acquiring gear information of a vehicle and the current rotating speed of an engine;
judging whether the vehicle has a gear reduction requirement or not according to the gear information and the current rotating speed;
if so, acquiring the actual inertia torque of the engine of the vehicle and the current required torque of the engine;
acquiring a fire path request increasing torque according to the actual inertia torque and the required torque;
correcting the required torque and the actual inertia torque to obtain a gas path request increasing torque;
and controlling the engine to work according to the torque requested to be increased by the fire path and the torque requested to be increased by the air path.
2. The sound wave adjusting method according to claim 1, wherein correcting the required torque and the actual inertia torque to obtain a gas path requested increase torque comprises:
collecting a driving mode of the vehicle;
performing linear interpolation table look-up according to the driving mode and the current rotating speed to obtain an amplification factor m and an offset p;
and correcting the required torque and the actual inertia torque by using an amplification factor m and an offset p to obtain the gas path request increased torque.
3. The sound wave adjusting method according to claim 2, wherein obtaining the fire path request increase torque from the actual inertia torque and the required torque comprises:
and adding the actual inertia torque and the required torque to obtain the required torque of the fire path.
4. The sound wave regulation method of claim 3, wherein the gas path requested increased torque is obtained according to the following equation:
Tgas circuit＝Tv+T×m+p；
Wherein, TGas circuitIncreasing torque, T, for gas path requestsvFor the required torque, T is the actual inertia torque, m is the amplification factor, and p is the offset.
5. A sound wave regulation system for an automatic transmission, comprising:
the acquisition unit is used for acquiring gear information of a vehicle and the current rotating speed of an engine;
the gearbox controller is connected with the engine controller and used for judging whether the vehicle has a downshift requirement according to the gear information and the current rotating speed, acquiring the actual inertia torque of the engine of the vehicle and the current required torque of the engine when the vehicle has the downshift requirement, acquiring the fire path request increasing torque according to the actual inertia torque and the required torque, and correcting the required torque and the actual inertia torque to obtain the gas path request increasing torque;
and the engine controller is used for controlling the engine to work according to the torque increase requested by the fire path and the torque increase requested by the air path.
6. The sound wave adjustment system of claim 5,
the acquisition unit is also used for acquiring the driving mode of the vehicle;
and the gearbox controller is also configured to perform linear interpolation table look-up according to the driving mode and the current rotating speed to obtain an amplification factor m and an offset p, and correct the required torque and the actual inertia torque by using the amplification factor m and the offset p to obtain the gas path request increased torque.
7. The sound wave regulation system of claim 6, wherein the transmission controller is further configured to add the actual inertia torque and the requested torque to obtain the flare request increase torque.
8. The sound wave regulation system of claim 7, wherein the transmission controller is further configured to derive the air path requested increased torque according to the following equation:
Tgas circuit＝Tv+T×m+p；
Wherein, TGas circuitIncreasing torque, T, for gas path requestsvFor the required torque, T is the actual inertia torque, m is the amplification factor, and p is the offset.
9. The sound wave regulation system of claim 8, wherein the engine controller is in signal communication with the transmission controller via a CAN.
10. The sound wave modulation system of claim 9, wherein the hot path requested incremental torque is less than the hot path requested incremental torque.
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