CN114087082B - Redundant engine speed control device and control method - Google Patents
Redundant engine speed control device and control method Download PDFInfo
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- CN114087082B CN114087082B CN202111447508.2A CN202111447508A CN114087082B CN 114087082 B CN114087082 B CN 114087082B CN 202111447508 A CN202111447508 A CN 202111447508A CN 114087082 B CN114087082 B CN 114087082B
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000446 fuel Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 238000009434 installation Methods 0.000 claims description 10
- 238000013461 design Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of engines, and particularly discloses a redundant engine rotating speed control device, which comprises the following components: the device comprises an electric control unit, a first crankshaft rotation speed sensor, a second crankshaft rotation speed sensor, a cam rotation speed sensor, a crankshaft signal panel and a cam signal panel, wherein the first crankshaft rotation speed sensor and the second crankshaft rotation speed sensor are used for collecting rotation speed signals of the crankshaft signal panel; the cam rotating speed sensor is used for collecting rotating speed signals and phase signals of the cam signal panel; the electronic control unit is used for carrying out corresponding engine speed and phase calculation according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor, outputting available engine speed and phase, and determining the engine speed and phase according to the available engine speed and phase so as to carry out fuel injection control. The invention also discloses a redundant engine speed control method. The redundant engine rotating speed control device provided by the invention is simple and reliable and has low cost.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a redundant engine speed control device and a redundant engine speed control method.
Background
With the upgrading of emission regulations and the improvement of the requirements on the safety and reliability of products, higher requirements are put on the use of engines applied to the fields of automobiles, ships and the like at the current stage, and the redundancy control is one of the requirements. The purpose of redundant control is that when the engine parts or part of the system are in fault, the system still has the rotating speed control capability, maintains the continuous and stable operation of the engine, and ensures the safety of personnel.
At present, in the field of engines, the provided engine redundancy control method mainly comprises the step of redundancy of a fuel (mechanical) system and an electric control system (comprising an ECU, an actuator, a sensor and the like), namely, a set of fuel system or electric control system is additionally arranged on the basis of the original system, and even the whole set of system is greatly increased in design cost, use cost and maintenance cost.
As is well known, a crankshaft rotation speed sensor and a cam rotation speed sensor in an engine electric control system are the most important components, and are essential for the rotation speed control of an engine.
Therefore, aiming at the defect of redundant design of the whole set of electric control system in the existing engine electric control technology, how to provide a simple, reliable and safe redundant rotating speed control mode becomes a technical problem to be solved by the technicians in the field.
Disclosure of Invention
The invention provides a redundant engine speed control device and a redundant engine speed control method, which solve the problems of complex electric control redundant design and low reliability in the related technology.
As a first aspect of the present invention, there is provided a redundant engine speed control apparatus including: the electric control unit, the first crankshaft speed sensor, the second crankshaft speed sensor, the cam speed sensor, the crankshaft signal panel and the cam signal panel are arranged on the engine,
the first crankshaft rotating speed sensor and the second crankshaft rotating speed sensor are arranged on the outer side of the edge of the crankshaft signal panel and are used for collecting rotating speed signals of the crankshaft signal panel;
the cam rotating speed sensor is arranged on the outer side of the edge of the cam signal panel and is used for collecting rotating speed signals and phase signals of the cam signal panel;
the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor are all connected with the electric control unit through a wire harness;
the electronic control unit is used for calculating corresponding engine speed and phase according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor, outputting available engine speed and phase, and determining the engine speed and phase according to the available engine speed and phase so as to perform fuel injection control.
Further, the electronic control unit is configured to perform corresponding engine speed and phase calculation according to signal states of the first crankshaft speed sensor, the second crankshaft speed sensor, and the cam speed sensor, and output an available engine speed and phase, and select to perform fuel injection control according to the available engine speed and phase, including:
the electronic control unit is used for judging whether faults exist according to the signal states of the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor;
executing corresponding engine speed and phase calculation modes according to the judging result of whether faults exist or not, and obtaining corresponding available engine speed and phase;
the engine speed and phase are determined based on the corresponding available engine speed and phase to control fuel injection.
Further, the number of teeth of the cam signal panel is not less than 5, and one of the cam signal panels is a characteristic tooth.
Further, the number of teeth of the cam signal disc includes 7 teeth, one of which is a characteristic tooth.
Further, the installation included angle between the first crankshaft rotating speed sensor and the second crankshaft rotating speed sensor comprises any angle of 0-360 degrees.
As another aspect of the present invention, there is provided a redundant engine speed control method, including:
respectively acquiring signal states of a first crankshaft rotating speed sensor, a second crankshaft rotating speed sensor and a cam rotating speed sensor;
corresponding engine speed and phase calculation is carried out according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor, and the available engine speed and phase are output;
and determining the engine speed and the phase according to the available engine speed and the phase, and controlling fuel injection according to the determined engine speed and the phase.
Further, the calculating the corresponding engine speed and phase according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor, and outputting the available engine speed and phase includes:
judging whether the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor have faults or not according to the signal states of the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor respectively;
and executing corresponding engine speed and phase calculation modes according to the judging result of whether faults exist or not, and obtaining corresponding available engine speed and phase.
Further, the executing the corresponding engine speed and phase calculation mode according to the judging result of whether the fault exists, and obtaining the corresponding available engine speed and phase includes:
executing a first calculation mode when the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor are normal, wherein the available engine speeds and phases obtained comprise a first engine speed and a first engine phase and a second engine speed and a second engine phase;
executing a second calculation mode when the second crankshaft rotation speed sensor fails and the first crankshaft rotation speed sensor and the cam rotation speed sensor are normal, wherein the available engine rotation speed and the available engine phase comprise a first engine rotation speed and a first engine phase;
executing a third calculation mode when the cam rotation speed sensor fails and the first and second crankshaft rotation speed sensors are normal, wherein the available engine rotation speeds and phases obtained include a first engine rotation speed and a first engine phase and a second engine rotation speed and a second engine phase;
when the second crankshaft rotating speed sensor and the cam rotating speed sensor are in failure and the first crankshaft rotating speed sensor is normal, executing a fourth calculation mode, wherein the obtained available engine rotating speed and phase comprise a first engine rotating speed and a first engine phase;
executing a fifth calculation mode when the first crankshaft rotation speed sensor fails and the second crankshaft rotation speed sensor and the cam rotation speed sensor are normal, wherein the available engine rotation speed and the available engine phase comprise a second engine rotation speed and a second engine phase;
when the first crankshaft rotating speed sensor and the cam rotating speed sensor are in fault and the second crankshaft rotating speed sensor works normally, executing a sixth calculation mode, wherein the obtained available engine rotating speed and phase comprise a second engine rotating speed and a second engine phase;
and when the first crankshaft rotating speed sensor and the second crankshaft rotating speed sensor are in fault and the cam rotating speed sensor works normally, executing a seventh calculation mode, wherein the obtained available engine rotating speed and phase comprise a third engine rotating speed and a third engine phase.
Further, the first calculation mode includes calculating a first engine speed and a first engine phase from a signal of a first crankshaft speed sensor and a signal of the cam speed sensor, and calculating a second engine speed and a second engine phase from a signal of a second crankshaft speed sensor and a signal of the cam speed sensor;
the second calculation mode includes calculating a first engine speed and a first engine phase based on a signal of a first crankshaft speed sensor and a signal of a cam speed sensor;
the third calculation mode comprises the steps of calculating the first engine speed according to the signal of the first crankshaft speed sensor, obtaining a first engine phase through a cylinder guessing starting mode, calculating the second engine speed according to the signal of the second crankshaft speed sensor, and calculating a second engine phase according to the installation included angle between the second crankshaft speed sensor and the first crankshaft speed sensor;
the fourth calculation mode comprises the steps of calculating the first engine speed according to the signal of the first crankshaft speed sensor, and acquiring a first engine phase by a mode of cylinder guessing starting;
the fifth calculation mode includes calculating a second engine speed and a second engine phase from the signal of the second crankshaft speed sensor and the signal of the cam speed sensor;
the sixth calculation mode comprises the steps of calculating a second engine speed according to a signal of a second crankshaft speed sensor, and acquiring a second engine phase by a mode of cylinder guessing starting;
the seventh calculation mode includes calculating a third engine speed and a third engine phase from a signal of a cam speed sensor.
Further, the determining the engine speed and the phase according to the available engine speed and the phase, and controlling the fuel injection according to the determined engine speed and the phase, includes:
when the available engine speed and phase include both the first engine speed and the first engine phase and the second engine speed and the second engine phase, or include only the first engine speed and the first engine phase, determining the engine speed and phase as the first engine speed and the first engine phase, and controlling fuel injection according to the first engine speed and the first engine phase;
when the available engine speed and phase comprise only the second engine speed and the second engine phase, determining the engine speed and phase as the second engine speed and the second engine phase, and controlling fuel injection according to the second engine speed and the second engine phase;
when the available engine speed and phase include only the third engine speed and the third engine phase, determining the engine speed and phase as the third engine speed and the third engine phase, and controlling fuel injection according to the third engine speed and the third engine phase.
According to the redundant engine speed control device, the two crankshaft speed sensors and the cam speed sensor are adopted, so that the speed control can be performed when any one of the sensors works normally, the normal operation of the engine is ensured, the continuous operation capability of the engine is greatly improved, and the safety and the reliability are higher. In addition, as only two crankshaft rotation speed sensors and one cam rotation speed sensor are adopted, the redundant control of the rotation speeds under various fault conditions can be realized, and the installation and the maintenance are more convenient while the cost is saved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
fig. 1 is a schematic structural diagram of a redundant engine speed control device provided by the invention.
Fig. 2 is a flowchart of the operation of the electronic control unit in the redundant engine speed control device provided by the invention.
Fig. 3 is a specific working flow chart of an electric control unit in the redundant engine speed control device provided by the invention.
Fig. 4 is a flowchart of a redundant engine speed control method provided by the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a redundant engine speed control device is provided, and fig. 1 is a schematic structural diagram of the redundant engine speed control device provided according to an embodiment of the present invention, as shown in fig. 1, including:
the electric control unit 1, the first crank shaft rotating speed sensor 3, the second crank shaft rotating speed sensor 4, the cam rotating speed sensor 5, the crank shaft signal panel 6 and the cam signal panel 7, wherein the crank shaft signal panel 6 and the cam signal panel 7 are both arranged on the engine,
the first crankshaft rotation speed sensor 3 and the second crankshaft rotation speed sensor 4 are both arranged on the outer side of the edge of the crankshaft signal panel 6 and are used for collecting rotation speed signals of the crankshaft signal panel 6;
the cam rotation speed sensor 5 is arranged outside the edge of the cam signal panel 7 and is used for collecting rotation speed signals and phase signals of the cam signal panel 7;
the first crankshaft rotation speed sensor 3, the second crankshaft rotation speed sensor 4 and the cam rotation speed sensor 5 are all connected with the electronic control unit 1 through a wire harness 2;
the electronic control unit 1 is configured to perform corresponding engine speed and phase calculation according to signal states of the first crankshaft speed sensor 3, the second crankshaft speed sensor 4 and the cam speed sensor 5, output an available engine speed and phase, and determine an engine speed and phase according to the available engine speed and phase, so as to perform fuel injection control.
According to the redundant engine speed control device provided by the embodiment of the invention, through adopting the two crankshaft speed sensors and the cam speed sensor, the speed control can be carried out when any one of the two sensors works normally, so that the normal operation of the engine is ensured, the continuous operation capability of the engine is greatly improved, and the safety and the reliability are higher. In addition, as only two crankshaft rotation speed sensors and one cam rotation speed sensor are adopted, the redundant control of the rotation speeds under various fault conditions can be realized, and the installation and the maintenance are more convenient while the cost is saved.
In the embodiment of the invention, the positions of the first crank speed sensor 3, the second crank speed sensor 4, the cam speed sensor 5, the crank signal plate 6 and the cam signal plate 7 shown in fig. 1 are opposite to the first cylinder piston of the engine at the compression top dead center.
It should be understood that the crankshaft signal disc 6 and the cam signal disc 7 in the embodiment of the present invention are both mounted on the engine, and the specific mounting manner is well known to those skilled in the art, and will not be described herein.
Specifically, the cam signal plate 6 has a number of teeth of not less than 5, and one of them is a characteristic tooth.
It should be understood that the characteristic tooth is a cylinder judging tooth and is used for judging the cylinder. The adoption of multiple teeth of the cam signal panel 6 can ensure that the electronic control unit 1 can calculate the cam rotation speed more quickly and accurately.
In the embodiment of the present invention, the number of teeth of the cam signal disc 6 includes 7 teeth (i.e., 6+1 teeth), one of which is a characteristic tooth.
Specifically, the installation angle α between the first crankshaft rotational speed sensor 3 and the second crankshaft rotational speed sensor 4 includes any angle of 0 to 360 °.
It should be understood that, since the first crank speed sensor 3 and the second crank speed sensor 4 share one crank signal disc, the arrangement is not limited, and the angle α between the center line of the first crank speed sensor 3 and the center line of the second crank speed sensor 4 may be any value of 0 to 360 °.
Specifically, the electronic control unit is configured to perform corresponding calculation of engine speed and phase according to signal states of the first crankshaft speed sensor, the second crankshaft speed sensor, and the cam speed sensor, and output an available engine speed and phase, and select to perform fuel injection control according to the available engine speed and phase, where the electronic control unit includes:
the electronic control unit is used for judging whether faults exist according to the signal states of the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor;
executing corresponding engine speed and phase calculation modes according to the judging result of whether faults exist or not, and obtaining corresponding available engine speed and phase;
the engine speed and phase are determined based on the corresponding available engine speed and phase to control fuel injection.
It should be understood that, as shown in fig. 2 and 3, it is a specific control procedure of the electronic control unit.
Specifically, the method comprises the following steps:
s1: the electronic control unit 1 acquires signal states of a first crankshaft rotation speed sensor 3, a second crankshaft rotation speed sensor 4 and a cam rotation speed sensor 5;
s2: the electronic control unit 1 executes corresponding engine speed and phase calculation modes according to the acquired signal state of the speed sensor and outputs available engine speed and phase;
s3: the electronic control unit 1 controls the fuel injection to maintain the engine running at the set rotational speed, with the selection being made according to the available engine speed and phase.
The electronic control unit 1 acquires signal states of the first crankshaft rotation speed sensor 3, the second crankshaft rotation speed sensor 4 and the cam rotation speed sensor 5 and judges whether faults exist or not;
the first calculation mode of the engine speed and the phase is performed when the first crank speed sensor 3, the second crank speed sensor 4, and the cam speed sensor 5 are all operating normally. At this time, the electronic control unit 1 acquires a first engine rotational speed signal and a first engine phase through the first crankshaft rotational speed sensor signal and the cam rotational speed sensor signal judgment cylinder, acquires a second engine rotational speed and a second engine phase through the second crankshaft rotational speed sensor signal and the cam rotational speed sensor signal judgment cylinder, and finally outputs the first engine rotational speed and the first engine phase, and the second engine rotational speed and the second engine phase simultaneously;
when the second crankshaft speed sensor 4 fails, the first crankshaft speed sensor 3 and the cam speed sensor 5 are both operating normally, and a second calculation mode of engine speed and phase is performed. At this time, the electronic control unit 1 acquires the first engine speed and the first engine phase through the first crankshaft speed sensor signal and the cam speed sensor signal and finally outputs the first engine speed and the first engine phase;
and when the cam rotation speed sensor fails, executing a third calculation mode of the engine rotation speed and the phase when the first crankshaft rotation speed sensor and the second crankshaft rotation speed sensor work normally. At this time, the electronic control unit 1 obtains a first engine speed through a first crankshaft speed sensor signal, obtains a first engine phase of the engine through a cylinder guessing starting mode, then calculates and obtains a second engine speed and a second engine phase based on a second crankshaft speed sensor signal and an installation included angle alpha between the second crankshaft speed sensor signal and the first crankshaft speed sensor, and finally outputs the first engine speed and the first engine phase, and outputs the second engine speed and the second engine phase;
and when the second crankshaft rotation speed sensor and the cam rotation speed sensor are in failure and the first crankshaft rotation speed sensor works normally, executing a fourth calculation mode of the engine rotation speed and the phase. At this time, the electronic control unit 1 obtains a first engine speed through a first crankshaft speed sensor signal, obtains a first engine phase of the engine through a mode of cylinder guessing starting, and finally outputs the first engine speed and the first engine phase;
and when the first crankshaft rotation speed sensor fails, the second crankshaft rotation speed sensor and the cam rotation speed sensor work normally, and a fifth calculation mode of the engine rotation speed and the phase is executed. At this time, the electronic control unit 1 acquires a second engine speed and a second engine phase through the second crankshaft speed sensor signal and the cam speed sensor signal and finally outputs the second engine speed and the second engine phase;
and when the first crankshaft rotation speed sensor and the cam rotation speed sensor are in failure and the second crankshaft rotation speed sensor is in normal operation, executing a sixth calculation mode of the engine rotation speed and the phase. At this time, the electronic control unit 1 obtains a second engine speed through a second crankshaft speed sensor signal, obtains a second engine phase of the engine through a mode of cylinder guessing starting, and finally outputs the second engine speed and the second engine phase;
when the first crankshaft speed sensor and the second crankshaft speed sensor are simultaneously malfunctioning, only the cam speed sensor is operating normally, a seventh calculation mode of engine speed and phase is performed. At this time, the electronic control unit 1 calculates and acquires the third engine speed and the third engine phase through the cam speed sensor signal, and finally outputs the third engine speed and the third engine phase.
Specifically, when the electronic control unit outputs the first engine speed and the first engine phase, the second engine speed and the second engine phase simultaneously, or outputs only the first engine speed and the first engine phase, fuel injection control is performed based on the first engine speed and the first engine phase, so that the engine is maintained to run at the set speed;
when the electronic control unit only outputs the second engine speed and the second engine phase, fuel injection control is performed based on the second engine speed and the second engine phase, so that the engine is maintained to run at the set speed;
when the electronic control unit only outputs the third engine speed and the third engine phase, fuel injection control is performed based on the third engine speed and the third engine phase, thereby maintaining the engine running at the set speed.
In summary, the redundant engine speed control device provided by the embodiment of the invention performs redundant design on the speed sensor, has a simple structure, is convenient to install and maintain, and can perform speed control so as to ensure normal operation of the engine as long as any one of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor works normally, thereby greatly improving the continuous operation capability of the engine.
As another embodiment of the present invention, a redundant engine speed control method is provided, which may be specifically understood as the specific control procedure of the electronic control unit described above, where, as shown in fig. 4, the method includes:
s110, respectively acquiring signal states of a first crankshaft rotating speed sensor, a second crankshaft rotating speed sensor and a cam rotating speed sensor;
in the embodiment of the invention, the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor are respectively acquired through communication connection with the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor.
S120, corresponding engine speed and phase calculation is carried out according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor, and the available engine speed and phase are output;
in the embodiment of the invention, the method specifically comprises the following steps:
judging whether the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor have faults or not according to the signal states of the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor respectively;
and executing corresponding engine speed and phase calculation modes according to the judging result of whether faults exist or not, and obtaining corresponding available engine speed and phase.
Further specifically, as shown in fig. 3, includes:
executing a first calculation mode when the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor are normal, wherein the available engine speeds and phases obtained comprise a first engine speed and a first engine phase and a second engine speed and a second engine phase;
executing a second calculation mode when the second crankshaft rotation speed sensor fails and the first crankshaft rotation speed sensor and the cam rotation speed sensor are normal, wherein the available engine rotation speed and the available engine phase comprise a first engine rotation speed and a first engine phase;
executing a third calculation mode when the cam rotation speed sensor fails and the first and second crankshaft rotation speed sensors are normal, wherein the available engine rotation speeds and phases obtained include a first engine rotation speed and a first engine phase and a second engine rotation speed and a second engine phase;
when the second crankshaft rotating speed sensor and the cam rotating speed sensor are in failure and the first crankshaft rotating speed sensor is normal, executing a fourth calculation mode, wherein the obtained available engine rotating speed and phase comprise a first engine rotating speed and a first engine phase;
executing a fifth calculation mode when the first crankshaft rotation speed sensor fails and the second crankshaft rotation speed sensor and the cam rotation speed sensor are normal, wherein the available engine rotation speed and the available engine phase comprise a second engine rotation speed and a second engine phase;
when the first crankshaft rotating speed sensor and the cam rotating speed sensor are in fault and the second crankshaft rotating speed sensor works normally, executing a sixth calculation mode, wherein the obtained available engine rotating speed and phase comprise a second engine rotating speed and a second engine phase;
and when the first crankshaft rotating speed sensor and the second crankshaft rotating speed sensor are in fault and the cam rotating speed sensor works normally, executing a seventh calculation mode, wherein the obtained available engine rotating speed and phase comprise a third engine rotating speed and a third engine phase.
Further specifically, the first calculation mode includes calculating a first engine speed and a first engine phase from a signal of a first crankshaft speed sensor and a signal of the cam speed sensor, and calculating a second engine speed and a second engine phase from a signal of a second crankshaft speed sensor and a signal of the cam speed sensor;
the second calculation mode includes calculating a first engine speed and a first engine phase based on a signal of a first crankshaft speed sensor and a signal of a cam speed sensor;
the third calculation mode comprises the steps of calculating the first engine speed according to the signal of the first crankshaft speed sensor, obtaining a first engine phase through a cylinder guessing starting mode, calculating the second engine speed according to the signal of the second crankshaft speed sensor, and calculating a second engine phase according to the installation included angle between the second crankshaft speed sensor and the first crankshaft speed sensor;
the fourth calculation mode comprises the steps of calculating the first engine speed according to the signal of the first crankshaft speed sensor, and acquiring a first engine phase by a mode of cylinder guessing starting;
the fifth calculation mode includes calculating a second engine speed and a second engine phase from the signal of the second crankshaft speed sensor and the signal of the cam speed sensor;
the sixth calculation mode comprises the steps of calculating a second engine speed according to a signal of a second crankshaft speed sensor, and acquiring a second engine phase by a mode of cylinder guessing starting;
the seventh calculation mode includes calculating a third engine speed and a third engine phase from a signal of a cam speed sensor.
S130, determining the engine speed and the phase according to the available engine speed and the phase, and controlling fuel injection according to the determined engine speed and the phase.
In the embodiment of the invention, the method specifically comprises the following steps:
when the available engine speed and phase include both the first engine speed and the first engine phase and the second engine speed and the second engine phase, or include only the first engine speed and the first engine phase, determining the engine speed and phase as the first engine speed and the first engine phase, and controlling fuel injection according to the first engine speed and the first engine phase;
when the available engine speed and phase comprise only the second engine speed and the second engine phase, determining the engine speed and phase as the second engine speed and the second engine phase, and controlling fuel injection according to the second engine speed and the second engine phase;
when the available engine speed and phase include only the third engine speed and the third engine phase, determining the engine speed and phase as the third engine speed and the third engine phase, and controlling fuel injection according to the third engine speed and the third engine phase.
In summary, according to the redundant engine speed control method provided by the embodiment of the invention, through obtaining the signal states of the two crankshaft speed sensors and one cam speed sensor, when any one of the two sensors works normally, the speed control can be performed, so that the normal operation of the engine is ensured, the continuous operation capability of the engine is greatly improved, and the safety and the reliability are higher. In addition, as only two crankshaft rotation speed sensors and one cam rotation speed sensor are adopted, the redundant control of the rotation speeds under various fault conditions can be realized, and the installation and the maintenance are more convenient while the cost is saved.
The specific working process of the redundant engine speed control method provided by the embodiment of the present invention may refer to the description of the redundant engine speed control device, which is not repeated here.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (6)
1. A redundant engine speed control method is applied to a redundant engine speed control device and is characterized in that the redundant engine speed control device comprises an electric control unit, a first crankshaft speed sensor, a second crankshaft speed sensor, a cam speed sensor, a crankshaft signal panel and a cam signal panel, wherein the crankshaft signal panel and the cam signal panel are both arranged on an engine,
the first crankshaft rotating speed sensor and the second crankshaft rotating speed sensor are arranged on the outer side of the edge of the crankshaft signal panel and are used for collecting rotating speed signals of the crankshaft signal panel;
the cam rotating speed sensor is arranged on the outer side of the edge of the cam signal panel and is used for collecting rotating speed signals and phase signals of the cam signal panel;
the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor are all connected with the electric control unit through a wire harness;
the electronic control unit is used for calculating corresponding engine speed and phase according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor, outputting available engine speed and phase, and determining the engine speed and phase according to the available engine speed and phase so as to perform fuel injection control;
the redundant engine speed control method comprises the following steps:
respectively acquiring signal states of a first crankshaft rotating speed sensor, a second crankshaft rotating speed sensor and a cam rotating speed sensor;
corresponding engine speed and phase calculation is carried out according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor, and the available engine speed and phase are output;
determining an engine speed and a phase according to the available engine speed and phase, and controlling fuel injection according to the determined engine speed and phase;
the method for calculating the engine speed and the phase according to the signal states of the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor and outputting the available engine speed and the available phase comprises the following steps:
judging whether the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor have faults or not according to the signal states of the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor respectively;
executing corresponding engine speed and phase calculation modes according to the judging result of whether faults exist or not, and obtaining corresponding available engine speed and phase;
the method for calculating the engine speed and the phase according to the judging result of whether faults exist or not includes the steps of:
executing a first calculation mode when the first crankshaft speed sensor, the second crankshaft speed sensor and the cam speed sensor are normal, wherein the available engine speeds and phases obtained comprise a first engine speed and a first engine phase and a second engine speed and a second engine phase;
executing a second calculation mode when the second crankshaft rotation speed sensor fails and the first crankshaft rotation speed sensor and the cam rotation speed sensor are normal, wherein the available engine rotation speed and the available engine phase comprise a first engine rotation speed and a first engine phase;
executing a third calculation mode when the cam rotation speed sensor fails and the first and second crankshaft rotation speed sensors are normal, wherein the available engine rotation speeds and phases obtained include a first engine rotation speed and a first engine phase and a second engine rotation speed and a second engine phase;
when the second crankshaft rotating speed sensor and the cam rotating speed sensor are in failure and the first crankshaft rotating speed sensor is normal, executing a fourth calculation mode, wherein the obtained available engine rotating speed and phase comprise a first engine rotating speed and a first engine phase;
executing a fifth calculation mode when the first crankshaft rotation speed sensor fails and the second crankshaft rotation speed sensor and the cam rotation speed sensor are normal, wherein the available engine rotation speed and the available engine phase comprise a second engine rotation speed and a second engine phase;
when the first crankshaft rotating speed sensor and the cam rotating speed sensor are in fault and the second crankshaft rotating speed sensor works normally, executing a sixth calculation mode, wherein the obtained available engine rotating speed and phase comprise a second engine rotating speed and a second engine phase;
when the first crankshaft rotating speed sensor and the second crankshaft rotating speed sensor are in fault and the cam rotating speed sensor works normally, executing a seventh calculation mode, wherein the available engine rotating speed and the available engine phase comprise a third engine rotating speed and a third engine phase;
wherein,
the first calculation mode includes calculating a first engine speed and a first engine phase from a signal of a first crankshaft speed sensor and a signal of the cam speed sensor, and calculating a second engine speed and a second engine phase from a signal of a second crankshaft speed sensor and a signal of the cam speed sensor;
the second calculation mode includes calculating a first engine speed and a first engine phase based on a signal of a first crankshaft speed sensor and a signal of a cam speed sensor;
the third calculation mode comprises the steps of calculating the first engine speed according to the signal of the first crankshaft speed sensor, obtaining a first engine phase through a cylinder guessing starting mode, calculating the second engine speed according to the signal of the second crankshaft speed sensor, and calculating a second engine phase according to the installation included angle between the second crankshaft speed sensor and the first crankshaft speed sensor;
the fourth calculation mode comprises the steps of calculating the first engine speed according to the signal of the first crankshaft speed sensor, and acquiring a first engine phase by a mode of cylinder guessing starting;
the fifth calculation mode includes calculating a second engine speed and a second engine phase from the signal of the second crankshaft speed sensor and the signal of the cam speed sensor;
the sixth calculation mode comprises the steps of calculating a second engine speed according to a signal of a second crankshaft speed sensor, and acquiring a second engine phase by a mode of cylinder guessing starting;
the seventh calculation mode includes calculating a third engine speed and a third engine phase from a signal of a cam speed sensor.
2. The redundant engine speed control method of claim 1, wherein said determining an engine speed and phase from said available engine speed and phase and controlling fuel injection based on said determined engine speed and phase comprises:
when the available engine speed and phase include both the first engine speed and the first engine phase and the second engine speed and the second engine phase, or include only the first engine speed and the first engine phase, determining the engine speed and phase as the first engine speed and the first engine phase, and controlling fuel injection according to the first engine speed and the first engine phase;
when the available engine speed and phase comprise only the second engine speed and the second engine phase, determining the engine speed and phase as the second engine speed and the second engine phase, and controlling fuel injection according to the second engine speed and the second engine phase;
when the available engine speed and phase include only the third engine speed and the third engine phase, determining the engine speed and phase as the third engine speed and the third engine phase, and controlling fuel injection according to the third engine speed and the third engine phase.
3. The redundant engine speed control method according to claim 1, wherein the electronic control unit is configured to perform corresponding engine speed and phase calculations based on signal states of the first crankshaft speed sensor, the second crankshaft speed sensor, and the cam speed sensor, and output an available engine speed and phase, and select for fuel injection control based on the available engine speed and phase, comprising:
the electronic control unit is used for judging whether faults exist according to the signal states of the first crankshaft rotating speed sensor, the second crankshaft rotating speed sensor and the cam rotating speed sensor;
executing corresponding engine speed and phase calculation modes according to the judging result of whether faults exist or not, and obtaining corresponding available engine speed and phase;
the engine speed and phase are determined based on the corresponding available engine speed and phase to control fuel injection.
4. The redundant engine speed control method of claim 1 wherein the cam signal disc has a number of teeth not less than 5 and one of the cam signal discs is a characteristic tooth.
5. The redundant engine speed control method of claim 4 wherein the cam signal disc has a number of teeth comprising 7 teeth, one of which is a characteristic tooth.
6. The redundant engine speed control method of claim 1, wherein the installation angle between the first crankshaft speed sensor and the second crankshaft speed sensor comprises any one of 0-360 °.
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