JPH0415532A - Operating state detecting device - Google Patents

Abstract

PURPOSE:To minimize the number of detecting means and to detect the operating state of each operation unit of a dynamic system with high accuracy by adding many physical quantities of the same phase position (or section) obtained by the period phase detection and the total physical quantity detection. CONSTITUTION:In an engine state detecting device 7, a crank angle sensor 8 being a period phase detecting means detects a period phase at the time of operation of an engine 1, and a torque sensor 9 being a physical quantity detecting means detects a crank shaft torque being the total physical quantity. A crank angle signal and a torque signal from both the sensors 8, 9 are A/D- converted 10, 11, and based on the period phase detection by the sensor 8, a crank shaft torque detection value is divided at every torque average value in the same phase section corresponding to each cylinder and stored in a torque storage part 12. As for the torque average value stored in the storage part 12, many values thereof are added by a torque adding part 13, and a torque added value corresponding to the phase is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an operating state detection device that detects the operating state of each operating unit of a dynamic system, such as a torque difference between cylinders of an engine.

(Prior Art) Conventionally, as an example of a physical quantity detection device, the following torque detection device is known.

First, as a torque sensor body, for example, JP-A-64
As described in Japanese Patent No. 3-210736, there is a known sensor that directly detects shaft torque by utilizing the fact that magnetostrictive characteristics change due to changes in torque.

In addition, MBT control (minimum control) controls engine ignition timing to maximize engine output or efficiency.
m advance for Be5t Toruqu
As a torque detection method for e), for example, as described in Japanese Patent Publication No. 5945041, there is a method that performs highly accurate torque detection by inputting a search signal and taking a correlation with the output. It is being

Furthermore, as applied technology, for example, Japanese Patent Application Laid-open No. 5118:
1) As described in Publication No. 69, etc., an ignition timing control method is known in which MBT control is performed for each cylinder of an engine.

(Problem to be Solved by the Invention) However, since the torque sensor described in JP-A-6.3-2+0736 etc. directly measures torque, cycle fluctuations occur. The accuracy of the torque detection value obtained as torque information is poor due to the influence of white noise caused by various fluctuations.

Further, in the torque detection method described in Japanese Patent Publication No. 59-45011, the accuracy of the detected torque value is good, but it is not possible to detect differences in torque between cylinders.

Furthermore, in the ignition timing control method that performs MBT control for each engine cylinder, which is described in Japanese Patent Application Laid-Open No. 59-48269, etc., the cylinder internal pressure detection value is used as the engine torque equivalent value. In order to obtain the cylinder internal pressure detection value for each cylinder, it is necessary to install cylinder internal pressure sensors for the number of cylinders, which increases the number of parts and installation man-hours.
This is disadvantageous in terms of cost.

The present invention has been made in view of the above-mentioned problems, and provides an operating state detection device for a dynamic system having a plurality of operating units, which is advantageous in terms of cost by minimizing the number of detection means. The objective is to detect the operating state of each operating unit of a dynamic system with high detection accuracy.

(Means for Solving the Problems) In order to solve the above problems, the operating state detection device of the present invention adds up a large number of physical quantities at the same phase position or the same phase section obtained by periodic phase detection and total physical quantity detection, and The corresponding physical quantity added value is used as a means for determining the physical quantity at the phase position or phase interval.

In other words, as shown in the claim correspondence diagram in Fig. 1, if there are multiple actuation units and the output characteristics of a predetermined physical quantity during operation are looked at, the output characteristics of a predetermined physical quantity will have a specific period and frequency depending on the number of actuation units. In a dynamic system that does not exhibit characteristics that change depending on the operating speed, a periodic phase detection means a detects a periodic phase when the moving system is operated, and a physical quantity detecting means a that detects a total physical quantity when the moving system operates. A physical quantity storage means C which stores the total physical quantity detection value based on phase detection divided into physical quantity detection values at the same phase position or the same phase section, and a large number of physical NMaF values stored in the physical quantity storage means C are added. It is characterized by comprising a physical quantity adding means d for obtaining a phase-corresponding physical quantity added value.

(Function) When the dynamic system is in operation, the periodic phase detection means a detects the periodic phase, and the physical quantity detection means detects the total physical quantity.

Then, in the physical quantity storage means C, based on the detection of the periodic phase, the total physical quantity detected value is divided into individual physical quantity detected values at the same phase position or the same phase section and stored.

Next, in the physical quantity addition means d, the physical quantity storage means C
A phase-corresponding physical quantity addition value is obtained by adding up a large number of physical quantity addition values stored in .

Therefore, the final physical quantity addition value is a value obtained by adding up the results of multiple detections, and the effects of white noise due to cycle fluctuations and various fluctuations are removed as the additions are repeated. It is possible to extract physical quantities based only on the unique state of each operating unit.

Furthermore, since the physical quantity addition value is obtained by phase correspondence at the same phase position or the same phase interval, and the generation state of the physical quantity of each operation unit is directly related to the phase, only the total physical quantity of the dynamic system can be calculated as one physical quantity. The detection means (J) can detect the operating state of each operating unit, such as the difference in physical quantity of each operating unit.

(Example) Embodiments of the present invention will be described below based on the drawings.

First, I will explain the configuration.

FIG. 2 shows a block diagram of an MBT control system for ignition timing to which the engine state detection device (operation state detection device) of the embodiment is applied. ), 2 is a basic output calculation unit that calculates a basic advance angle value based on engine speed and fuel injection amount, etc. in ignition timing control, and 3 is an advance angle value that is used to obtain the optimal ignition timing for each cylinder in ignition timing control. 4 is an addition section that adds the basic output and the control output; 5 inputs the added value and the crank angle signal, and outputs a command to control the energization time flowing to the ignition coil. 6 is an individual control result determination unit that inputs the torque generation information for each cylinder from the engine state detection device Y, determines the control result for each cylinder, and outputs feedback information to the control output calculation unit 3. It is.

The engine state detection device γ includes a crank angle sensor 8 (periodic phase detection means) that detects a periodic phase when the engine 1 is operating, and a torque sensor 9 (physical quantity) that detects crankshaft torque (total physical quantity) when the engine 1 is operating. detecting means), an A/D converter 10.11 that A/D converts the crank angle signal and torque signal from both the sensors 8 and 9, and crankshaft torque detection based on periodic phase detection by the crank angle sensor 8. A torque storage section 12 (physical quantity storage means) that stores values (physical quantity detection values) separately for each torque average value in the same phase section corresponding to each cylinder; Torque addition unit 13 that adds a large number of values to obtain a phase-corresponding torque addition value
(physical quantity addition means).

Next, the effect will be explained.

FIG. 3 shows each torque characteristic when the engine 1 rotates once, and explains the reason why the engine state can be detected by the engine state detection device 7 which applies the lock-in method in which the torque value is entered in the phase.

The true generated torque is shown in the A characteristic, the noise component that overlaps with the reaction force from the road surface, the oil pump load of the power steering, the power generation load, etc. is shown in the B characteristic, and the torque characteristic observed by the torque sensor 9 is shown in the C characteristic (C = A+8), the C characteristic shows the sum of the true generated torque over many times, the E characteristic shows the many times the sum of the noise component, and the F characteristic shows the result of adding the C characteristic and the E characteristic.

First, looking at the C characteristic observed by the torque sensor 9, it can be seen that it is difficult to distinguish the torque difference field for each cylinder because the noise component is superimposed on the true torque.

However, since these noise disturbances are not synchronized with the cam angle (crank angle), they become zero when integrated (E characteristic).

Therefore, by integrating in synchronization with the cam angle (crank angle), the characteristics of each cylinder are amplified, noise is reduced, and it is possible to detect the torque of each cylinder as shown in the F characteristic.

Although FIG. 3 has explained only high-frequency component noise due to engine rotation, the same effect can be had on low-frequency disturbances due to engine rotation, such as disturbances from the road surface and engine cycle fluctuations.

FIG. 4 is a flowchart showing the flow of the detection processing operation in the engine state detection device 7.

In step 41, the crank angle signal and torque signal from the crank angle sensor 8 and torque sensor 9 are read.

In step 42, the detected crankshaft torque values are stored in the torque storage section 12 for each average torque value in the same phase section corresponding to each cylinder based on the periodic phase detection by the crank angle sensor 8.

That is, as shown in FIG. 5, phase sections corresponding to each cylinder (1) to (2) are determined, and the torque average value is determined for each section.

In step 43, the torque adding section 13 adds up a large number of torque average values stored in the torque storage section 12 for each cycle to obtain a phase-corresponding torque addition value.

In step 44, the addition results for each cylinder (1) to (2) are output.

That is, the output is as shown in FIG. 6, and it can be seen that in this example, the cylinder (2) generates a large torque, and the cylinder (2) generates a small torque.

As explained above, in the embodiment, the four-cylinder engine operating state detection device 7 adds up many torque values in the same phase section obtained by crank angle detection and crankshaft torque detection, and Since the torque addition value of is used as the torque value in that phase interval, 1
Although it is a cost-effective device with only one torque sensor 9, each cylinder of the engine 1 has high detection accuracy.
(2) Torque (knock) generation operating state can be detected.

Further, the operating state detection device Y of the embodiment can be said to be an optimal device when applied as a device for providing phytback information to a system that performs MBT control of ignition timing for each cylinder.

Although the embodiments have been described above based on the drawings, the specific configuration is not limited to these embodiments, and the present invention (including J. ,.

For example, in the embodiment, an engine is shown as an example of a dynamic system having a plurality of operating units, but it is of course applicable to other dynamic systems such as a positive displacement type breather or a plunger pump.

In the embodiment, an example is shown in which torque is detected as a physical quantity, but physical quantities other than torque may be detected.

In the embodiment, an example was shown in which addition is stored separately for each torque detection value in the same phase section, but it may also be added and stored separately for each torque detection value in the same phase position. In this case, F in FIG. Detection results as shown in the characteristics will be obtained.

In the embodiment, an example of application to a system that performs MBT control of ignition timing for each cylinder is shown, but it can of course be applied to other systems as long as it is a system in which it is desired to know status information for each of a plurality of operating units. .

(Effects of the Invention) As explained above, in the present invention, in an operating state detection device for a dynamic system having a plurality of operating units, the same phase position or the same phase obtained by periodic phase detection and total physical quantity detection is provided. This method adds up many physical quantities in an interval and uses the phase-corresponding physical quantity added value as the physical quantity at that phase position or phase interval, which allows for high detection while minimizing the number of detection means and making it an advantageous device in terms of cost. The effect is that the operating state of each operating unit of the dynamic system can be detected with precision.

[Brief explanation of the drawing]

Fig. 1 is a Clemm correspondence diagram showing the operating state detection device of the present invention, Fig. 2 is a diagram of an MBT control system for ignition timing to which the operating state detection device of the embodiment is applied, and Fig. 3 shows torque values in the phase. Each torque characteristic diagram explains the reason why the engine state can be detected by the lock-in method. Fig. 4 is a flowchart showing the flow of the detection processing operation in the operating state detection device of the embodiment. Fig. 5 shows the various torque characteristics with respect to the cam angle. FIG. 6, which does not show the detection phase interval for each cylinder, is a characteristic diagram of the added and stored torque results for each cylinder. a...Cyclic phase detection means b...Physical quantity detection means C...Physical quantity storage means d...Physical quantity addition means

Claims (1)

[Claims] (1) In a dynamic system that has multiple actuation units and exhibits the characteristic that when looking at the output characteristics of a predetermined physical quantity during operation, it has a specific period depending on the number of actuation units and the frequency changes depending on the actuation speed. , a periodic phase detection means for detecting a periodic phase when the dynamic system is in operation; a physical quantity detection means for detecting a total physical quantity when the dynamic system is in operation; A physical quantity storage means for separately storing each physical quantity detection value in a phase interval, and a physical quantity addition means for adding up a large number of physical quantity storage values stored in the physical quantity storage means to obtain a phase-corresponding physical quantity added value. An operating state detection device characterized by: