JPH04295162A - Control device for equipment - Google Patents

Abstract

PURPOSE:To improve control precision of a device so as to prevent the occurrence of cancellation of processing of a control program the priority order of which is set to a low value by selecting a scheduler by which the computing period of a control program is decided according to the degree of importance responding to the operation state of a device. CONSTITUTION:An engine control unit(ECU) 30 of an engine control device has a plurality of schedulers 12 and a plurality of control programs executed at a specified fundamental computing period. The engine control unit decides the operation state of a device based on the operation state of a device detected by a sensor, such as a boost pressure sensor 5, a throttle opening sensor 22, a water temperature sensor 14, and a number of revolutions sensor 25, and selects the scheduler, matching with the operation state of a device, of a plurality of schedulers 12 according to an operation state.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a control device for equipment,
In particular, the present invention relates to a device control device in an engine control device having a scheduler of an arithmetic processing module.

0002

[Prior Art] In conventional engine control, in order to improve efficiency by distributing the processing load on the arithmetic processing unit over time, the module with the smallest cycle among the modules that are executed in a certain basic calculation cycle is selected. The injection pulse output, etc., which is executed by shifting the standard by half a cycle and is affected by the engine speed, is
Running as an interrupt module. If the execution cycles overlap, both processes are performed within one module, and when processing within one module is impossible, the modules are given processing priority and moved to the next module. Processing is in progress.

0003

[Problem to be solved by the invention] Modern engine controls require high-precision and high-speed control functions. It becomes necessary to interrupt a module with a short processing cycle or a module with a crank angle cycle. Therefore, it becomes difficult to complete a predetermined control within a certain period, and even if the module moves to the next module, the processing cannot be completed, resulting in the problem of canceling the processing in a lower module whose priority is set low. occurs.

0004

[Means for Solving the Problems] The present invention has been made for the purpose of solving the above-mentioned problems, and has the following configuration as a means for solving the above-mentioned problems. That is, the apparatus is a control device for equipment that includes a plurality of schedulers and a plurality of control programs executed at a constant basic calculation cycle, and includes a detection means for detecting the operating status of the equipment, and a detection means for detecting the operating status of the equipment, and a detection means for detecting the operating status of the equipment. a determination unit that determines the operating status of the equipment based on the operating status of the equipment; and a determination unit that determines the operating status of the equipment from among the plurality of schedulers according to the operating status of the equipment determined by the determining unit. and selection means for selecting a matching scheduler.

Preferably, the device is an engine;
The selection means selects a scheduler that shortens the calculation cycle of the idle feedback control program when the determination means determines that the rotational speed of the engine is below a predetermined value. Preferably, the device is an engine, and the selection means selects a scheduler that shortens the calculation cycle of knocking control when the determination means determines that the intake pipe pressure of the engine is equal to or higher than a predetermined value. do.

More preferably, the device is an engine, and the selection means selects the emission mode scheduler when the determination means determines that the engine is before starting the starter at the time of starting.

[0007]

[Operation] In the above configuration, the scheduler is selected so that the calculation period of the control program is determined in accordance with the degree of importance depending on the operating state of the equipment, and functions to improve the control accuracy of the equipment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows an engine control device (hereinafter referred to as an engine control device) as a device control device according to an embodiment of the present invention.
FIG. 2 is a diagram showing the overall configuration of the device. In FIG. 1, a piston 2 is sliding in a combustion chamber 3 of an engine body 1, and the combustion chamber 3 has an intake port 4 and an exhaust port 6.
is supported. Further, an intake valve 7 is provided between the intake port 4 and the combustion chamber 3, and an exhaust valve 8 is provided between the exhaust port 6 and the combustion chamber 3. A throttle valve 9 for controlling the amount of intake air is provided upstream of the intake port 4, and a surge tank 1 serving as an intake expansion chamber is provided downstream of the throttle valve 9.
0 is placed. Further downstream thereof, a boost pressure sensor 5 that detects boost pressure, which is intake air pressure, and an injector 11 that injects and supplies fuel are provided.

The amount of intake air into the intake port 4 is detected by an air flow sensor 20a in an air flow meter 20.
The temperature of the intake air is detected by an intake temperature sensor 21. The throttle opening sensor 22 is an idle switch (not shown)
is built-in and detects the opening degree of the throttle valve 9. Further, the engine water temperature is detected by a water temperature sensor 14. Further, the distributor 15 is provided with a rotation speed sensor 25 for detecting the engine rotation speed, a crank angle sensor 28 for detecting the crank angle, and an O2 sensor 26 is provided in the exhaust port 6. .

[0010] The engine control unit (ECU) 30 is
In addition to receiving outputs from the above-mentioned sensors, it also sends an ignition time control signal to the distributor 15 and a control signal to the injector 11 to adjust the fuel injection amount. Further, the ECU 30 internally includes a plurality of schedulers 12 for managing predetermined arithmetic processing, which will be described later, and a memory 13 for storing control data.

Next, a scheduler selection control procedure according to an embodiment of the present invention will be explained. FIG. 2 is a flowchart showing a basic scheduler selection procedure in the apparatus according to the embodiment. In the same figure, the ECU 30 is
In step S1, detection signals are input from various sensors, and in subsequent step S2, the operating state of the engine is determined based on the detection signals input in step S1. Then, in step S3, a scheduler having a structure that matches the operating condition is selected.

FIG. 3 is a diagram showing the configuration of a basic scheduler.
Processes that are always required, such as an 8M module that operates at a cycle of c and has process A, process B, etc., a 16M module that operates at a cycle of 16 msec and has process a, process b, etc., and a 32M module that operates at a cycle of 32 msec. Consists of.

On the other hand, scheduler B is a scheduler A with some processes removed to accommodate changes in operating conditions. Specifically, an 8M module that operates at a cycle of 8 msec and has processing B, etc., a 16M module that operates at a cycle of 16 msec and has processing B, etc., and a 32 ms module that operates at a cycle of 16 msec and has processing B, etc.
It is configured with processing required depending on conditions, such as a 32M module that operates at an ec cycle.

[0014]Thus, by the series of processes shown in FIG.
Since engine control is performed by selecting scheduler A or B that suits the operating state at that time, unnecessary calculation processing can be eliminated and processing time can be shortened. Therefore, a procedure for selecting a scheduler having a structure that matches the specific operating state of the engine and its control will be described below. <Scheduler Selection in Idle Feedback Control> FIG. 4 is a flowchart showing a scheduler selection procedure related to idle feedback control. In the figure, the ECU 30 adjusts the throttle opening T based on the signal from the throttle opening sensor 22 in step S11.
The engine rotation speed Ne is detected based on the signal from the VO and rotation speed sensor 25, and the boost pressure is detected based on the detected value by the boost pressure sensor 5, respectively. Continued step S12
Now, referring to the map shown in FIG. 5, the throttle opening degree T
VO is smaller than the predetermined value K2, and the engine speed Ne
It is determined whether or not is less than a predetermined value K1.

If the determination result in step S12 is YES, that is, if the operating state of the engine is in the shaded area in FIG.
13, select scheduler A shown in FIG. However, if the determination result in step S12 is NO, it is assumed that the idle state has been left and the process proceeds to step S14, where scheduler B in FIG. 6 is selected. The above processing is repeatedly executed at a constant calculation cycle.

In the scheduler A of FIG. 6, idle feedback control IDFB is performed at a cycle of 8 msec.
The basic fuel injection time TP is controlled in a 16 msec cycle, and the target boost pressure PD is controlled in a 32 msec cycle.
control is performed. On the other hand, in scheduler B, idle feedback control and control for target boost pressure are switched with respect to scheduler A, and 8 m
Control for the target supercharging pressure is performed in a 32 msec period, and idle feedback control is performed in a 32 msec period. <Selection of scheduler when starting the engine> FIG. 7 is a flowchart showing a control procedure for selecting a scheduler before starting the starter when starting the engine using the engine water temperature as a parameter.

At step S21 in FIG. 7, the ECU 30:
Engine water temperature THW based on the detected value by water temperature sensor 14
Also, the engine rotation speed Ne is detected based on the signal from the rotation speed sensor 25. Then, in step S22, it is determined whether the engine water temperature THW is 15°C or higher. If it is determined in step S22 that the engine water temperature is 15°C or less, it is assumed that the engine water temperature is low due to the engine being cold during startup, and the process proceeds to step S23, where the scheduler in the emission mode is finely controlled. Therefore, scheduler A shown in FIG. 8 is selected. However, if the engine water temperature is 15° C. or higher, there is no need to take measures to cool down the engine, so the program proceeds to step S24 and selects scheduler B.

Scheduler A in FIG. 8 is an 8M module that executes idle warming-up system control AWS and water temperature correction CW at an 8 msec cycle, and a 16 msec scheduler.
Control the basic fuel injection time TP at cycle c1
6M module and acceleration correction CACC of 32ms
It is composed of 32M modules that execute in ec cycles. Scheduler B is a modified version of scheduler A, and performs acceleration correction CACC in an 8 msec cycle, and performs idle warm-up system control AWS and water temperature correction CW in a 32 msec cycle. <Other scheduler selections> As an example of other scheduler selections, check whether the intake pipe pressure is above a predetermined value,
It is conceivable to select a scheduler to change the calculation period of the notching controller.

For example, in a place where the intake pipe pressure is high and there is a high possibility that knocking will occur, the calculation is performed every 30° CA, and in a place where the possibility of knocking is low, the calculation is performed every 30° CA.
The method is to move the knotting module every 60° CA. Here, the aim is to perform fine control on the assumption that the boost pressure is immediately reflected in the driving situation.

It is also possible to count the number of knocks and change the calculation cycle of the knocking controller in accordance with the number of past knocks. As explained above, according to this embodiment, the operating state of the engine is determined based on engine speed, boost pressure, etc., and depending on the state,
By selecting the optimal scheduler from among schedulers with multiple different configurations, it is possible to eliminate unnecessary calculation processing and lower the processing interval of less important calculation processing, in other words, to move processing to a slower cycle. This has the effect of reducing the processing capacity per unit time and preventing the inconvenience that the processing of a module with a lower processing priority is always canceled.

[0021]

[Effects of the Invention] As explained above, according to the present invention,
By determining the operating status of equipment and selecting a scheduler that determines the calculation cycle of the control program according to the importance level according to the operating status, it is possible to improve and maintain control accuracy during operation. It has the effect of becoming.

Furthermore, by selecting a scheduler that shortens the calculation cycle of the idle feedback control program, it is possible to achieve both improvement in idle stability and improvement in control accuracy in other operating regions. There is. Furthermore, by selecting a scheduler with a shortened calculation period for knocking control, it is possible to achieve both improvement in the ability to prevent knocking and improvement in control accuracy in other operating regions.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall configuration of an engine control device as a device control device according to an embodiment of the present invention;

FIG. 2 is a flowchart showing a basic scheduler selection procedure in the device according to the embodiment;

[Figure 3] A diagram showing the configuration of a basic scheduler,

[Figure 4
] A flowchart showing a scheduler selection procedure regarding idle feedback control,

[Fig. 5] A diagram showing the engine operating range defined by throttle opening and engine speed,

FIG. 6 is a diagram showing a scheduler related to idle feedback control;

FIG. 7 is a flowchart showing a control procedure for selecting a scheduler before starting the starter when starting the engine;

[Figure 8]
FIG. 3 is a diagram showing a scheduler related to control during engine starting.

[Explanation of symbols]

1 Engine body 2 Piston 3 Combustion chamber 4 Intake port 5 Boost pressure sensor 6 Exhaust port 7 Intake valve 8 Exhaust valve 9 Throttle valve 10 Surge tank 11 Injector 14 Water temperature sensor 15　　　　Distributor 20 Air flow meter 20a Air flow sensor 21 Intake temperature sensor 22 Throttle opening sensor 25 Rotation speed sensor 26 O2 sensor 28 Crank angle sensor

Claims (4)

[Claims] 1. A control device for equipment, comprising a plurality of schedulers and a plurality of control programs executed at a constant basic calculation cycle, comprising: a detection means for detecting the operating status of the equipment; a determining means for determining the operating state of the equipment based on the detected operating state of the equipment; and a determining means for determining the operating state of the equipment from among the plurality of schedulers, 1. A device control device for equipment, comprising: selection means for selecting a scheduler that matches an operating state. 2. The device is an engine, and the selection means is a scheduler that shortens the calculation period of the idle feedback control program when the determination means determines that the rotation speed of the engine is below a predetermined value. 2. The device control device according to claim 1, wherein the device selects the following. 3. The device is an engine, and the selection means selects a scheduler that shortens the calculation cycle of knocking control when the determination means determines that the intake pipe pressure of the engine is equal to or higher than a predetermined value. The device control device according to claim 1, characterized in that: 4. The device is an engine, and the selection means selects an emission mode scheduler when the determination means determines that the engine is before starting the starter at the time of starting the engine. The apparatus for controlling equipment according to claim 1.