JP2015055277A - Drive control device of electromagnetic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive control device of an electromagnetic valve which can suppress an adverse effect caused by a malfunction when the malfunction corresponding to a part of a plurality of the electromagnetic valves occurs.SOLUTION: A valve-opening command time Ti of a valve-opening command signal is corrected so that an actual valve-opening time TopenA of a fuel injection valve coincides with a valve-opening requirement time Topen. An abnormality of the fuel injection valve is determined on the basis of a valve-opening delay time Ton and a valve-closing operation time Toff which are detected, and when it is determined that the fuel injection valve of any of cylinders is abnormal, the valve-opening requirement time Topen of the normal fuel injection valve is corrected so as to compensate for the displacement of a fuel injection amount by the fuel injection valve which is determined to be abnormal (S44, S45). When the actual valve-opening time TopenA of the fuel injection valve which is determined to be abnormal is converged to the valve-opening requirement time Topen, the correction of the valve-opening requirement time Topen of the normal fuel injection valve is stopped.

Description

  The present invention relates to a drive control device for a solenoid valve that controls the drive of a plurality of solenoid valves, and more particularly to a solenoid valve that controls the flow rate of a fluid, such as a fuel injection valve or an evaporative fuel purge control valve mounted on an internal combustion engine. The present invention relates to an apparatus for performing opening / closing control of the.

  Patent Document 1 discloses an electromagnetic valve control device that detects an actual opening timing of an electromagnetic valve based on a driving current waveform of the electromagnetic valve and detects an actual closing timing of the electromagnetic valve based on a driving voltage waveform. ing. According to this device, the inflection point of the current waveform is detected as the actual valve opening timing, and the inflection point of the voltage waveform is detected as the actual valve closing timing.

  Patent Document 2 discloses a drive control device for a fuel injection valve of an internal combustion engine. According to this device, the actual valve opening time of the fuel injection valve is detected using the lift sensor, and the drive signal of the fuel injection valve is corrected so that the actual valve opening time coincides with the target valve opening time.

JP-A-6-174139 JP-A-63-97869

  According to the above-described conventional device, it is possible to make the actual valve opening time coincide with the target valve opening time by performing feedback control of the drive signal in accordance with the detected actual valve opening timing and actual valve closing timing. . However, for example, when there is an abnormality in the sensor used to detect the actual opening timing or the actual closing timing, or when foreign matter is mixed into the fuel injection valve, the fuel injection amount is reduced by performing the above feedback control. There may occur a situation in which the actual valve opening time cannot be made equal to the target valve opening time, or the actual valve opening time cannot be matched with the target valve opening time. In an internal combustion engine having a plurality of cylinders, when such an abnormality occurs in the fuel injection valve of one cylinder, the air-fuel ratio of the cylinder deviates from the target value, which may deteriorate exhaust characteristics.

  In an engine provided with a plurality of purge control valves for controlling the flow rate when the evaporated fuel generated in the fuel tank is supplied to the engine intake system, the same problem may occur for the purge control valves.

  The present invention has been made in consideration of the above-described points, and in the event that an abnormality corresponding to a part of a plurality of electromagnetic valves has occurred, an electromagnetic valve drive control device capable of suppressing adverse effects due to the abnormality is provided. The purpose is to provide.

  In order to achieve the above object, a first aspect of the present invention provides a drive control device for a solenoid valve that performs drive control of a plurality of solenoid valves (2) for controlling a flow rate of a fluid. Target opening time setting means for setting (Topen), actual valve opening time acquisition means for acquiring the actual valve opening time (TopenA) of the solenoid valve, and the actual valve opening time (TopenA) is the target valve opening time. Correction means for correcting the drive signal of the solenoid valve so as to coincide with (Topen), an abnormality determination means for judging an abnormality of the solenoid valve (2) based on the actual valve opening time (TopenA), When it is determined that at least one of the electromagnetic valves (2) is abnormal, an electromagnetic valve other than the electromagnetic valve determined to be abnormal is compensated so as to compensate for a flow rate deviation caused by the electromagnetic valve determined to be abnormal. Correct the drive signal of Characterized in that it comprises a correction means that.

  According to this configuration, the drive signal of the electromagnetic valve is corrected so that the actual valve opening time acquired matches the target valve opening time. Further, when an abnormality of the solenoid valve is determined based on the actual valve opening time, and it is determined that at least one of the plurality of solenoid valves is abnormal, a flow rate deviation caused by the solenoid valve determined to be abnormal is compensated. Then, the drive signal of the solenoid valve other than the solenoid valve determined to be abnormal is corrected. Therefore, it is possible to compensate for the flow rate deviation of the fluid passing through the electromagnetic valve determined to be abnormal with the fluid flow rate of the normal electromagnetic valve, and to suppress the flow rate deviation as a whole.

  According to a second aspect of the present invention, in the electromagnetic valve drive control device according to the first aspect, the actual valve opening time (TopenA) of the electromagnetic valve determined to be abnormal converges to the target valve opening time (Topen). When it is determined that the correction has been made, a stop means for stopping the correction by the correction means is provided.

  According to this configuration, when it is determined that the actual valve opening time of the electromagnetic valve determined to be abnormal has converged to the target valve opening time, the correction of the normal electromagnetic valve drive signal is stopped, so the abnormality is When the solenoid valve, which is temporary and judged to be abnormal, returns to the normal state, etc., the actual valve opening time converges to the target valve opening time. By stopping the correction of the drive signal, unnecessary correction calculation is not performed, and the processing load of the control device can be reduced.

  According to a third aspect of the present invention, in the electromagnetic valve drive control device according to the second aspect, the stop means determines the convergence for each set lattice point of the target valve opening time (Topen), and The determination result is held for each set grid point.

  According to this configuration, the determination of convergence is performed for each set grid point of the target valve opening time, and the result of the determination is held for each set grid point. In the case where the operation is performed, an appropriate response can be taken according to the set target valve opening time.

  According to a fourth aspect of the present invention, in the electromagnetic valve drive control device according to any one of the first to third aspects, the actual valve opening time acquisition means includes a valve opening timing (tOP) of the electromagnetic valve and The valve closing timing (tCL) is detected, the actual valve opening time (TopenA) is calculated based on the detected valve opening timing and the valve closing timing (tOP, tCL), and the abnormality determining means And at least one abnormality of the valve closing timing (tOP, tCL), and the correcting means detects a deviation amount (DTon, DToff) of at least one of the valve opening timing and the valve closing timing (tOP, tCL) from a normal value. ), The correction is performed.

  According to this configuration, the valve opening timing and the valve closing timing of the electromagnetic valve are detected, and the actual valve opening time is calculated based on the detected valve opening timing and valve closing timing. An abnormality in at least one of the valve opening timing and the valve closing timing is determined, and the normal electromagnetic valve drive signal is corrected based on the amount of deviation from the normal value of at least one of the valve opening timing and the valve closing timing. Therefore, it is possible to make an appropriate correction according to the amount of deviation from the normal value indicating the degree of abnormality.

1 is a diagram illustrating an internal combustion engine and a control device thereof according to an embodiment of the present invention. It is sectional drawing for demonstrating the structure of the principal part of the fuel injection valve shown in FIG. It is a figure which shows the lift characteristic of a fuel injection valve. It is a figure which shows Ti table for calculating valve opening instruction | command time (Ti) from valve opening request | requirement time (Topen). It is a flowchart of the fuel-injection control process which controls fuel-injection by a fuel-injection valve. It is a flowchart of the abnormality determination process performed by the process of FIG. It is a flowchart of the abnormality learning mode control performed by the process of FIG. It is a flowchart of the process which calculates the correction amount (TMD) of valve opening request | requirement time performed by the process of FIG. It is a figure which shows the table referred by the process of FIG. It is a flowchart of the convergence determination process performed by the process of FIG. It is a figure which expands and shows a part of Ti table, in order to demonstrate abnormality learning mode control.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a view showing an internal combustion engine (hereinafter referred to as an “engine”) and a control device thereof according to an embodiment of the present invention. In this embodiment, a fuel injection valve opened by a solenoid valve having a solenoid is opened. The amount of fuel supplied to the engine is controlled by changing the time.

  The four-cylinder engine 1 includes four fuel injection valves 2 corresponding to the cylinders, and the fuel injection valves 2 directly inject fuel into the combustion chamber of the engine 1. Each of the four fuel injection valves 2 is connected to the ECU 5, and its operation is controlled by the ECU 5.

  The fuel injection valve 2 is connected to a delivery pipe 4 through a fuel passage 3, and fuel pressurized by a high-pressure fuel pump (not shown) is supplied to the delivery pipe 4. A fuel pressure sensor 12 for detecting the fuel pressure PF is attached to the delivery pipe 4, and the detection signal is supplied to the ECU 5.

  The ECU 5 includes a voltage / current sensor 11 that detects a voltage VSL across the solenoid of the fuel injection valve 2 and a drive current ID supplied to the solenoid, an engine speed sensor 13 that detects the speed NE of the engine 1, Various sensors for detecting an engine operating state such as an intake air flow rate sensor 14 for detecting an intake air flow rate GAIR, an intake air temperature sensor 15 for detecting an intake air temperature TA, and a cooling water temperature sensor 16 for detecting an engine cooling water temperature TW are connected. The detection signals from these sensors are supplied to the ECU 5. The ECU 5 calculates the valve opening request time Topen of the fuel injection valve 2 according to the engine operating state using the detection signals of these sensors, calculates the valve opening command time Ti according to the valve opening request time Topen, and opens the valve. Drive control of the fuel injection valve 2 is performed using the valve command time Ti. The valve opening request time Topen is a parameter that is set so that a required fuel injection amount is obtained according to the engine operating state.

  FIG. 2 is a cross-sectional view for explaining a configuration of a main part of the fuel injection valve 2. The fuel injection valve 2 includes a valve shaft 31, a valve body 32 fixed to the tip of the valve shaft 31, and a valve shaft 31. Flanges 33, 34 fixed to the core, a core 35 on which electromagnetic force acts, a first spring 36 provided between the core 35 and the flange 34, a valve seat 37, a sleeve 38, a solenoid 39, A second spring 40 that urges the flange 34 in the valve closing direction (downward in the figure) and an inner collar 41 having a hollow portion that functions as a fuel passage are provided. The fuel injection valve 2 has a so-called hammering core structure in which a core 35 and a valve shaft 31 to which a valve body 32 is fixed are configured separately.

  FIG. 3 is a time chart for explaining the operation of the fuel injection valve 2. FIG. 3A shows the lift characteristics of the valve body 32, and FIG. 3B shows the corresponding valve opening command signal SDCTL. A broken line shown in FIG. 3A indicates the movement of the core 35.

  In the example shown in this figure, the valve opening command signal SDCTL is output from the valve opening command timing tIS to the valve closing command timing tIE (valve opening command time Ti), and current is supplied to the solenoid 39. The core 35 starts moving upward from the valve opening command timing tIS, and the valve body 32 starts moving from the valve opening timing tOP. The time from the valve opening command timing tIS to the valve opening timing tOP corresponds to the valve opening delay time Ton.

  The drive current is stopped at the valve closing command timing tIE, and the lift amount LFT of the valve body 32 becomes “0” at the valve closing timing tCL. Thereafter, the core 35 is lowered to the position of the flange 33 as indicated by a broken line. The time from the valve closing command timing tIE to the valve closing timing tCL corresponds to the valve closing operation time Toff.

In the present embodiment, for example, the valve opening timing tOP and the valve closing timing tCL are detected using the technique disclosed in Patent Document 1, and the valve opening command timing tIS and the valve closing command timing tIE are used as a reference from these detected values. The valve opening delay time Ton and the valve closing operation time Toff are calculated. Then, the actual valve opening time TopenA is calculated by applying the valve opening command time Ti, the valve opening delay time Ton and the valve closing operation time Toff to the following equation (1), and the actual valve opening time TopenA is calculated as the required valve opening time Topen. The feedback control of the valve opening command time Ti is performed so as to coincide with.
TopenA = Ti-Ton + Toff (1)

  Although the valve opening delay time Ton and the valve closing operation time Toff vary depending on the characteristic variation of the fuel injection valve 2 and the change with time, the control accuracy of the actual valve opening time TopenA is maintained with high accuracy by performing the feedback control. be able to. However, the valve opening delay time Ton and / or the valve closing operation time Toff may take an abnormal value due to foreign matters mixed into the fuel injection valve 2.

  Therefore, in this embodiment, abnormality determination is performed based on the detected valve opening delay time Ton and valve closing operation time Toff. For example, when one fuel injection valve 2 is determined to be abnormal, the other three fuels By correcting the fuel injection amount by the injection valve 2, the drive control of the fuel injection valve 2 is controlled so that the fuel amount supplied to the engine 1 is the same as when all the fuel injection valves are normal for the entire four cylinders. Do. Further, for the fuel injection valve determined to be abnormal, the relationship between the valve opening request time Topen and the valve opening command time Ti is learned for each set lattice point of the valve opening request time Topen, and the actual valve opening time TopenA and the valve opening time are opened. Control for reducing the deviation from the valve request time Topen is performed in the same manner as in the normal state.

  FIG. 4 shows an example of a Ti table used when the valve opening command time Ti is calculated according to the valve opening request time Topen. In the present embodiment, 100 lattice points are set in the Ti table for the valve opening request time Topen, for example, at intervals of 200 μsec to 10 μsec.

  FIG. 5 is a flowchart of the fuel injection control process for controlling the fuel injection by the fuel injection valve 2. In this process, the valve opening command time Ti is calculated for each cylinder, and fuel injection is performed.

  In step S11, it is determined whether or not the abnormality learning mode flag FFLRN is “1”. The abnormality learning mode flag FFLRN is set to “1” when it is determined in the abnormality determination process executed in step S22 that the fuel injection valve 2 of the control target cylinder is abnormal. When the answer to step S11 is affirmative (YES), the process proceeds to abnormal learning mode control (step S25). When the answer to step S11 is negative (NO), the process proceeds to step S12, and the cylinder number CYLN of the cylinder to be controlled is entered. (1-4) are acquired.

  In step S13, the valve opening request time Topen is calculated according to the engine operating state, and the abnormality determination parameter ERR [j] (j = 0 to 99) corresponding to the calculated valve opening request time Topen and the cylinder number CYLN is calculated. get. The abnormality determination parameter ERR [j] is a parameter that is held corresponding to the set grid point of the valve opening request time Topen and takes a value corresponding to the abnormality determination result, and is initially initialized to “0”. When the fuel injection corresponding to the valve opening request time Topen [j] is executed, it is set to “1” when it is determined that there is an abnormality, and after it is set to “1”, it is actually opened by the abnormality learning mode control. When the valve time TopenA substantially coincides with the valve opening request time Topen, it is set to “2”.

  In step S14, the Ti table (set for each cylinder) shown in FIG. 4 is searched according to the calculated valve opening request time Topen to calculate the valve opening command time Ti. In step S15, fuel injection is performed. The valve opening delay time Ton and the valve closing operation time Toff described above are detected (step S16). In step S17, the actual valve opening time TopenA is calculated using the above equation (1). In step S18, the valve opening time deviation DTopen is calculated by subtracting the actual valve opening time TopenA from the valve opening request time Topen.

In step S19, the valve opening command time Ti is corrected using the following equation (2). GP in Equation (2) is a control gain.
Ti = Ti + GP × DTOpen (2)

In step S20, the valve opening command time Ti corrected by the equation (2) is applied to the following equation (3) to update (learn) the Ti table. Ti on the right side is the valve opening command time corrected in step S19, TiP is a table setting value before update, and CL is an annealing coefficient set to about 0.1, for example.
Ti = CL * Ti + (1-CL) * TiP (3)

  In step S21, it is determined whether or not the abnormality determination parameter ERR [j] acquired in step S13 is “2”. If the answer is affirmative (YES), the process is immediately terminated. If the answer to step S21 is negative (NO), the abnormality determination process shown in FIG. 6 is executed.

In step S31 of FIG. 6, it is determined whether or not the valve opening delay time Ton is within an allowable range, that is, whether or not it is greater than or equal to the predetermined lower limit value TonL and less than or equal to the predetermined upper limit value TonH. ) Immediately proceeds to step S33. When the answer to step S31 is negative (NO), it is determined that there is an abnormality in which the valve opening delay time Ton is outside the allowable range, the Ton abnormality flag FFTon is set to “1”, and the following equation (4) is used. , Ton deviation DTon [j] is calculated (step S32). Thereafter, the process proceeds to step S33. TonCNT of Formula (4) is a design median value.
DTon [j] = Ton-TonCNT (4)

In step S33, it is determined whether or not the valve closing operation time Toff is within an allowable range, that is, whether or not the valve closing operation time Toff is not less than the predetermined lower limit value ToffL and not more than the predetermined upper limit value ToffH, and the answer is affirmative (YES). If so, the process immediately proceeds to step S35. If the answer to step S33 is negative (NO), it is determined that there is an abnormality in which the valve closing operation time Toff is outside the allowable range, the Toff abnormality flag FFToff is set to “1”, and the following equation (5) is used. , Toff deviation DToff [j] is calculated (step S34). Thereafter, the process proceeds to step S35. ToffCNT in equation (5) is the design median value.
DToff [j] = Toff−ToffCNT (5)

  In steps S35 and S36, it is determined whether or not the Ton abnormality flag FFTon and the Toff abnormality flag FFToff are “1”, respectively. If both of the answers in steps S35 and S36 are negative (NO), the abnormality learning mode flag FFLRN is set to “0” (step S37). On the other hand, if the answer to step S35 or S36 is affirmative (YES), the abnormality learning mode flag FFLRN is set to “1” (step S38).

  Returning to FIG. 5, in step S23, it is determined whether or not the abnormality learning mode flag FFLRN is “1”, and if the answer is negative (NO), the processing is immediately terminated. When FFLRN = 1, the abnormality determination parameter ERR [j] is set to “1”, and the abnormal cylinder number ERRCYLN is set to the cylinder number CYLN of the current control target cylinder (step S24).

FIG. 7 is a flowchart of the abnormal learning mode control executed in step S25 of FIG.
In steps S41 and S42, the cylinder number CYLN is acquired, the valve opening request time Topen is calculated, and the abnormality determination parameter ERR [j] is acquired as in steps S12 and S13 of FIG.

  In step S43, it is determined whether the cylinder number CYLN is equal to the abnormal cylinder number ERRCYLN. If the answer to step S43 is negative (NO) and the current control target cylinder is a normal cylinder, the process proceeds to step S44. The TMD calculation process shown in FIG.

  In step S81 of FIG. 8, the TMDon table shown in FIG. 9A is searched according to the Ton deviation DTon [j], and the Ton correction amount TMDon is calculated. The TMDon table is set so that the Ton correction amount TMDon increases as the Ton deviation DTon increases, and when the Ton deviation DTon is “0”, the Ton correction amount TMDon is set to “0”. Yes. This is because an increase in the Ton deviation DTo corresponds to a shift in the fuel injection amount decreasing direction.

  In step S82, the TMDoff table shown in FIG. 9B is searched according to the Toff deviation DToff [j], and the Toff correction amount TMDoff is calculated. The TMDoff table is set so that the Toff correction amount TMDoff decreases as the Toff deviation DToff increases, and when the Toff deviation DToff is “0”, the Toff correction amount TMDoff is set to “0”. Yes. This is because an increase in the Toff deviation DToff corresponds to a deviation in the increasing direction of the fuel injection amount.

  In step S83, the correction amount TMD is calculated by adding the Ton correction amount TMDon and the Toff correction amount TMDoff.

Returning to FIG. 7, in step S45, the correction amount TMD is applied to the following equation (6) to correct the valve opening request time Topen.
Topen = Topen + TMD (6)
The processing in steps S46 to S52 is the same as the processing in steps S14 to S20 in FIG.

  On the other hand, if the answer to step S43 is affirmative (YES) and the current cylinder to be controlled is an abnormal cylinder, steps S61 to S67 are executed as in steps S46 to S52. In step S68, the convergence determination shown in FIG. Execute the process.

  In step S91 of FIG. 10, it is determined whether or not the abnormality determination parameter ERR [j] is “1”. If this answer is negative (NO), the convergence determination is unnecessary and the process is immediately terminated. .

  If the answer to step S91 is affirmative (YES), it is determined whether or not the absolute value of the valve opening time deviation DTopen calculated in step S65 of FIG. 7 is smaller than a determination threshold value DTTH (step S92). If the answer is negative (NO), the processing is immediately terminated. If the answer is affirmative (YES), it is determined that the feedback control has converged after the abnormality determination, and the convergence flag FCNV [j] is set to “1”. (Step S93).

  Returning to FIG. 7, in step S <b> 69, it is determined whether or not the convergence flag FCNV [j] is “1”. If the answer is negative (NO), the process is immediately terminated. Therefore, the abnormal learning mode flag FFLRN is maintained at “1”, and the abnormal learning mode control is continued.

  If the answer to step S69 is affirmative (YES), the process proceeds to step S70, where the abnormality determination parameter ERR [j] is set to “2”, and the Ton deviation DTon [j] and the Toff deviation DToff [j] are both “0”. And the abnormality learning mode flag FFLRN is returned to “0”. Thereby, the abnormality learning mode control is returned to the normal control.

  FIG. 11 is an enlarged view of a part of the Ti table for explaining the abnormal learning mode control, and the black circles shown in this figure are set lattice points. For example, if the fuel injection amount is shifted in the decreasing direction over the entire range of the valve opening request time Topen due to the abnormality of the fuel injection valve 2, the Ti table was initially set as shown by the solid line in FIG. Then, when learning is completed at all the set grid points (the set value converges), the setting is as shown by a broken line.

  In this embodiment, since learning is performed for each set grid point, as shown in FIG. 11B, a grid point with an index parameter j of j1 and a grid point with j2 are sequentially indicated by broken lines by learning. It is changed to the set value. That is, for example, when the set value Ti [j1] at j = j1 is moved to the value on the broken line, the convergence determination is performed, so the corresponding abnormality determination parameter ERR [j1] is set to “2”. As a result, when the valve opening request time Topen is a value corresponding to j = j1 of the same cylinder, the answer to step S21 in FIG. 5 becomes affirmative (YES), and subsequent abnormality determination is not performed.

  Depending on the state of abnormality, as shown in FIG. 11 (c), it may be necessary to correct only in a part of the valve opening request time Topen, or depending on the valve opening request time Topen. Since the correction amount may change, learning for each set grid point is effective.

  As described above, in the present embodiment, the valve opening command time Ti of the valve opening command signal SDCTL is corrected so that the actual valve opening time Topen matches the valve opening request time Topen. Further, when the abnormality of the fuel injection valve 2 is determined based on the detected valve opening delay time Ton and the valve closing operation time Toff, and it is determined that the fuel injection valve 2 of any cylinder is abnormal, The normal valve opening request time Topen of the fuel injection valve 2 is corrected so as to compensate for the determined deviation of the fuel injection amount by the fuel injection valve 2 (FIG. 7, steps S44, S46, FIG. 8). Therefore, it is possible to compensate for the deviation of the fuel injection amount caused by the fuel injection valve determined to be abnormal with the fuel injection amount of the normal fuel injection valve, and to suppress the deviation of the fuel injection amount for the entire four cylinders.

  When it is determined that the actual valve opening time TopenA of the fuel injection valve 2 determined to be abnormal has converged to the valve opening request time Topen, the correction of the normal valve opening request time Topen of the fuel injection valve 2 is stopped. Therefore, when the abnormality is temporary and the fuel injection valve 2 determined to be abnormal returns to a normal state, or when the update of the Ti table corresponding to the fuel injection valve 2 determined to be abnormal is completed Since the actual valve opening time TopenA substantially coincides with the valve opening request time Topen (convergence determination is performed), in such a case, the normal valve opening request time Topen of the fuel injection valve 2 is corrected. By stopping the operation, unnecessary correction calculation is not performed, and the processing load on the control device can be reduced.

  Further, the convergence determination is performed for each set grid point of the valve opening request time Topen, and the result of the determination is held as the abnormality determination parameter ERR [j] for each set grid point, for example, the operating range of the fuel injection valve 2 When an abnormal operation is performed in a part of the valve, it is possible to take an appropriate response according to the set valve opening request time Topen.

  Further, the opening timing tOP and the closing timing tCL of the fuel injection valve 2 are detected, and the actual opening time TopenA is calculated based on the detected opening timing, tOP and closing timing tCL. Abnormality of the valve opening delay time Ton and the valve closing operation time Toff calculated using the valve opening timing tOP and the valve closing timing tCL is determined, and based on the deviation amount of the valve opening delay time Ton and the valve closing operation time Toff, The valve opening request time Topen of the normal fuel injection valve 2 is corrected. Accordingly, it is possible to perform appropriate correction according to the Ton deviation DTon and / or the Toff deviation DToff indicating the deviation amount from the normal value indicating the degree of abnormality. If the Ton deviation DTon and / or the Toff deviation DToff is “0”, the corresponding correction amount is “0” (see FIG. 9), so that only the correction corresponding to the generated deviation is performed.

  Note that this embodiment is based on the assumption that the voltage / current sensor 11 is normal, and an abnormality (for example, a power line fault, ground fault, disconnection, etc.) of the voltage / current sensor 11 is determined in another abnormality determination process. Is done.

  When it is determined that any of the fuel injection valves 2 is abnormal, it is desirable to turn on a warning lamp. Further, since it is unlikely that learning is completed during one operation period for all grid points of the Ti table, even if the ignition switch is turned off, the abnormality learning mode flag FFLRN, the abnormality determination parameter ERR [j], the convergence flag The values of FCNV [j], Ton deviation DTon [j], and Toff deviation DToff [j] need to be maintained.

  In the present embodiment, the voltage / current sensor 11 constitutes part of the actual valve opening time acquisition means, and the ECU 5 includes part of the actual valve opening time acquisition means, target valve opening time setting means, correction means, abnormality determination means, The correcting means and the stopping means are configured. Specifically, Steps S16 and S17 in FIG. 5 and Steps S48, S49, S63, and S64 in FIG. 7 correspond to actual valve opening time acquisition means, and Step S13 in FIG. 5 and Step S42 in FIG. 5 corresponds to time setting means, steps S18 and S19 in FIG. 5, steps S50, S51, S65, and S66 in FIG. 7 correspond to correction means, and step S22 in FIG. 5 (processing in FIG. 6) corresponds to abnormality determination means. Steps S44 and S45 in FIG. 7 correspond to correction means, and step S21 in FIG. 5 and steps S69 and S70 in FIG. 7 correspond to stop means.

  The present invention is not limited to the embodiment described above, and various modifications can be made. For example, in the above-described embodiment, it is determined that the valve opening delay time Ton or the valve closing operation time Toff takes a value outside the allowable range even once. It is also possible to determine that there is an abnormality when taking a predetermined number of times (for example, 5 times).

  Also, the above-described abnormality is set when an allowable range for abnormality determination and a wider abnormality determination range are set and the detected Ton or Toff is outside the allowable range and takes a value within the abnormality determination range. When the mode learning control is executed and a value outside the abnormality determination range is taken, the abnormality learning mode control is not immediately started, and the normal valve opening command time Ti is continuously used for the corresponding request time Topen. However, the abnormality determination may be performed again (continuing normal control).

  In the embodiment described above, the convergence determination is performed for the specific valve opening request time Topen [j] in which it is determined that there is an abnormality, and the abnormality determination parameter ERR [j] is set to “2”. Then, the abnormality learning mode flag FFLRN is returned to “0” (FIG. 7, step S70), and the routine shifts to normal control. However, for a fuel injection valve that has been determined to be abnormal, there is a high possibility that it will be determined again to be abnormal for a different valve opening request time Topen. It will be. By repeating such an operation, a Ti table corrected in the entire range as shown by the broken line in FIG. 11A is generated.

  In place of the above-described embodiment, all the abnormality determination parameters ERR [j] (j) are determined for the fuel injection valve 2 (cylinder) in which it is determined that there is an abnormality for the specific valve opening request time Topen [j]. = 0 to 99) may be set to “1”, and the abnormality learning mode control may be continued until the abnormality determination parameter ERR [j] of all grid points becomes “2”. Even in such a case, the lattice point where the abnormality determination parameter ERR [j] is set to “2” is not corrected by the correction amount TMD of the valve opening request time Topen of the fuel injection valve 2 of the other cylinder. .

  In the above-described embodiment, the present invention is applied to the fuel injection valves provided in each of the plurality of cylinders as the electromagnetic valves. For example, when the evaporated fuel generated in the fuel tank is supplied to the intake system, the evaporated fuel is included. In the case where a plurality of purge control valves used for controlling the flow rate of the air-fuel mixture are provided, the present invention is also applicable to control of the plurality of purge control valves.

1 Internal combustion engine 2 Fuel injection valve (solenoid valve)
5 Electronic control unit (actual valve opening time acquisition means, target valve opening time setting means, correction means, abnormality determination means, correction means, stop means)
11 Voltage / current sensor (actual valve opening time acquisition means)

Claims (4)

In a drive control device for a solenoid valve that performs drive control of a plurality of solenoid valves that control the flow rate of fluid,
Target valve opening time setting means for setting a target valve opening time of the electromagnetic valve;
An actual valve opening time acquisition means for acquiring an actual valve opening time of the electromagnetic valve;
Correction means for correcting the drive signal of the solenoid valve so that the actual valve opening time coincides with the target valve opening time;
An abnormality determining means for determining an abnormality of the electromagnetic valve based on the actual valve opening time;
When it is determined that at least one of the plurality of solenoid valves is abnormal, a solenoid valve other than the solenoid valve determined to be abnormal is compensated so as to compensate for a flow rate deviation caused by the solenoid valve determined to be abnormal. A drive control device for an electromagnetic valve, comprising: correction means for correcting a drive signal.   2. The apparatus according to claim 1, further comprising a stopping unit that stops correction by the correcting unit when it is determined that the actual valve opening time of the electromagnetic valve determined to be abnormal has converged to the target valve opening time. The drive control apparatus of the described solenoid valve.   3. The solenoid valve according to claim 2, wherein the stop unit determines the convergence for each set grid point of the target valve opening time, and holds the determination result for each set grid point. 4. Drive control device. The actual valve opening time acquisition means detects the valve opening timing and the valve closing timing of the electromagnetic valve, calculates the actual valve opening time based on the detected valve opening timing and valve closing timing,
The abnormality determining means determines an abnormality of at least one of the valve opening timing and the valve closing timing;
The electromagnetic valve according to any one of claims 1 to 3, wherein the correction means performs the correction based on a deviation amount from a normal value of at least one of the valve opening timing and the valve closing timing. Drive control device.

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