JP3570170B2 - Control device for hydraulic control equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control device of a hydraulic control device, and particularly to a shift control of an automatic transmission of an automobile, an anti-skid brake control (ABS control), an acceleration slip control (TRC control), a vehicle attitude control (VSC control), and the like. The present invention relates to a control device of a hydraulic control device that performs control using hydraulic pressure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an automobile, control such as shift control of an automatic transmission and braking control of a vehicle (ABS, TRC or VSC control) is performed using hydraulic pressure, and various hydraulic control devices and control devices for controlling the hydraulic control devices are used. Is being developed.
[0003]
For example, Japanese Patent Laying-Open No. 6-341535 discloses a hydraulic control device for an automatic transmission configured to control clutch engagement pressure using a linear solenoid valve in clutch-to-clutch shift. Here, in order to prevent an engine blow-up during a clutch-to-clutch shift, an engine blow-up state during a gear shift is detected, and based on this detection result, the engine blow-up amount is reduced so as to reduce the engine blow-up amount. At least one of the drain hydraulic pressure of the side clutch or the brake and the supply hydraulic pressure of the engagement side clutch is controlled. The control of the hydraulic pressure is performed by controlling the linear solenoid valve based on the blow-up state of the engine.
[0004]
However, in order to use a linear solenoid valve, the digital signal from the electronic control unit must be converted into an analog signal, and the device configuration is complicated and costly. A duty solenoid valve which can be controlled as it is has been widely used.
[0005]
That is, a duty solenoid valve is provided that repeatedly generates ON and OFF duty pulses in a predetermined duty pulse cycle, and the controlled hydraulic pressure is controlled by controlling the ratio of the ON time and the OFF time of the duty pulse in each duty pulse cycle. Control devices for hydraulic control devices that perform duty control have been developed.
[0006]
[Problems to be solved by the invention]
However, for example, when the control shown in the above-mentioned Japanese Patent Application Laid-Open No. 6-341535 is to be performed by a control device of a hydraulic control device having a duty solenoid valve, the following problem occurs.
[0007]
That is, since the duty solenoid valve has an ON / OFF driving cycle (duty pulse cycle), when it becomes necessary to change the target value of the control oil pressure, the signal of the ON / OFF ratio corresponding to the new target value is immediately obtained. , There is a delay (dead time) due to the phase shift of the duty pulse cycle until the oil pressure actually changes, and the oil pressure instruction value itself corresponding to the oil pressure target value cannot be output immediately. There is a problem.
[0008]
For example, as shown in FIG. 13A, an event occurs that requires a sudden change in the target value of the controlled hydraulic pressure (hydraulic instruction value), and it is necessary to change the hydraulic instruction value from high to low. Suppose.
[0009]
In the conventional control, after the duty pulse cycle being output at this time ends, the pressure reduction command is reflected from the start of the next duty pulse cycle indicated by A in FIG. Accordingly, as shown by t1 in the figure, a dead time in which the command is not reflected occurs. This is basically the same when the hydraulic pressure instruction value changes from low to high.
[0010]
As a result, for example, in the case of shift control of an automatic transmission, it is not possible to sufficiently suppress engine bleeding up or excessive tie-up between clutches. Since the pressure increase and the pressure increase are delayed accordingly, there is a possibility that an inconvenience such as an inability to accurately perform the braking control may occur.
[0011]
To solve such a problem, a method of shortening the duty pulse cycle (on / off cycle) itself can be considered. However, although this method has an effect on, for example, a "pilot duty pulse for controlling a linear solenoid valve", it is not necessarily effective for a duty solenoid valve that directly controls hydraulic pressure. This is because if the duty pulse period is too short, the oil flow does not switch even if the duty solenoid valve is turned on and off, and the pressure adjustment itself cannot be performed.
[0012]
The present invention has been made in view of such a conventional problem, and in a hydraulic circuit using a duty solenoid valve, even if it is necessary to suddenly change the hydraulic pressure target value, the hydraulic pressure target value is quickly changed. It is an object of the present invention to provide a control device for a hydraulic control device configured to achieve the above.
[0013]
[Means for Solving the Problems]
The invention according to claim 1 is provided with a duty solenoid valve that repeatedly generates ON and OFF duty pulses at a predetermined duty pulse cycle, and controls a ratio of an ON time and an OFF time of the duty pulse in each duty pulse cycle. In the control device of the hydraulic control device that duty-controls the controlled hydraulic pressure, means for detecting occurrence of an event requesting abrupt change of the target value of the controlled hydraulic pressure; and Means for determining whether the direction in which the target value is to be changed is the same as the direction in which the controlled oil pressure changes at the beginning of the duty pulse period; and The controlled hydraulic pressure changes in the direction in which the target value is about to be changed, and at the beginning of the duty pulse cycle. Means for immediately interrupting and outputting a duty pulse corresponding to a new target value based on the event, regardless of the phase of the duty pulse cycle being output at that time, when it is determined that the direction to perform is the same. With the provision of the above, the above problem has been solved.
[0014]
Further, the invention according to claim 2 includes a duty solenoid valve that repeatedly generates an on / off duty pulse at a predetermined duty pulse cycle, and controls a ratio of an on time and an off time of the duty pulse in each duty pulse cycle. Accordingly, in the control device of the hydraulic control device that duty-controls the controlled hydraulic pressure, it is requested that the target value of the controlled hydraulic pressure be suddenly changed in a direction that is predetermined to be increased or reduced. Means for detecting that an event has occurred, such that the direction in which the target value is to be changed by the occurrence of the event is the same as the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle. Means for setting in advance, and when the event occurs, the duty pulse cycle output at that time. Regardless of the phase, means for interrupt output immediately duty pulse corresponding to the new target value based on the event, by having the is also that the above-mentioned problems are eliminated.
[0015]
Further, the invention according to claim 3 includes a duty solenoid valve that repeatedly generates an on / off duty pulse at a predetermined duty pulse cycle, and controls a ratio of an on time to an off time of the duty pulse in each duty pulse cycle. In the control device of the hydraulic control device that duty-controls the controlled hydraulic pressure, means for detecting that an event requesting a sudden change of the target value of the controlled hydraulic pressure has occurred, and the event has occurred. At the time, of the on / off signals of the duty pulse, a signal having a polarity that causes a change in the controlled hydraulic pressure in the same direction as the direction in which the target value is to be changed due to the occurrence of the event, A method of immediately outputting an interrupt for a predetermined time regardless of the phase of the output duty pulse cycle. When, in which also solves the above problems by providing a.
[0016]
In the present invention, "an event requiring a sudden change in the target value of the controlled hydraulic pressure has occurred" means, for example, that (a) the hydraulic pressure target value is suddenly changed when a certain condition is satisfied. When the control sequence is incorporated in advance, when the certain condition is satisfied, or (b) When the oil pressure is controlled to increase or decrease depending on a certain parameter, when the parameter serving as the index suddenly changes, ”Means that a situation has occurred in which the target value of the controlled hydraulic pressure is changed at a very high speed at a certain point in time.
[0017]
According to the first aspect of the present invention, when an event that requires a sudden change in the target value of the controlled hydraulic pressure occurs, the direction in which the target value is to be changed by the occurrence of the event is determined. It is first determined whether or not the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle is the same. As a result, when it is determined that they are the same, the duty pulse according to the latest hydraulic pressure instruction corresponding to the event is immediately output regardless of the phase of the duty pulse cycle output at that time. As a result, it is possible to effectively reduce the response delay of the hydraulic pressure.
[0018]
Here, the change direction is checked for the following reason. In other words, if the duty pulse corresponding to the new target value is to be output as soon as possible, for example, if an event occurs, the starting point of the duty pulse is reset, and from that point, the duty pulse corresponding to the new target value is output as an interrupt. There is a method of doing it.
[0019]
However, in this method, for example, as shown in FIG. 13 (A), the direction in which the controlled hydraulic pressure changes (in this example, from high to low, the pressure decreasing direction) and the direction in which the controlled hydraulic pressure changes in the initial stage of the duty pulse (this In the example, since it starts from off, it is effective when the pressure reduction direction matches), but when the directions are opposite to each other as shown in FIG. Since the new target value control is started from the control that reversely changes the control hydraulic pressure, the time corresponding to the time t2 in FIG. Control will be exercised.
[0020]
In particular, as shown in FIG. 13B, when an event occurs (when the duty pulse is on) and the hydraulic pressure is reset in a direction in which the target value changes, the problem is more remarkable. It becomes.
[0021]
Therefore, in the invention according to claim 1, first, it is determined whether or not the direction in which the target value is to be changed due to the occurrence of the event is the same as the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle. Like that. As a result, when it is determined that they are the same, the duty pulse according to the latest hydraulic pressure instruction corresponding to the event is immediately output regardless of the phase of the duty pulse cycle output at that time. Things.
[0022]
Thereby, the response delay of the hydraulic pressure can be reliably reduced without causing any trouble. In addition, this method is basically very simple in configuration, since it is only necessary to clear and set the starting point of the duty pulse cycle when an event occurs, and then simply output the duty pulse corresponding to the target value. .
[0023]
Note that, as in an embodiment described later, the direction in which the controlled hydraulic pressure changes when an event occurs depends on the application target of the present invention in some cases. In this case, if the duty pulse cycle of the duty solenoid valve is set in advance so as to start from a state corresponding to the predetermined direction, such determination / confirmation work can be omitted (claim 2). .
[0024]
By the way, in the invention according to claim 1, if the direction in which the target value necessarily changes due to the occurrence of the event and the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle are not the same, At the start of the interruption, the hydraulic pressure changes in the direction opposite to the direction in which the target value changes, so that this cannot be applied.
[0025]
Further, even if the directions are the same, a signal in the opposite direction is output in the latter half of each duty pulse cycle related to the interrupt output, so that a problem that rapid oil pressure change is hindered by that amount is inevitable. Occurs.
[0026]
According to the third aspect of the present invention, when an event occurs, the controlled hydraulic pressure in the same direction as the direction in which the target value is to be changed regardless of the phase of the duty pulse cycle output at that time. , And a signal having a polarity that causes a change is immediately output as an interrupt for a predetermined time. Accordingly, the hydraulic response can be maximized in any case (although the management of the predetermined time is required).
[0027]
The invention according to claim 3 further comprises means for detecting a change width of an on / off ratio of the duty pulse which changes due to the occurrence of the event, and changes the predetermined time according to the change width. It is better to do so. Alternatively, the predetermined time may be changed according to the oil temperature by detecting the oil temperature. By performing such a process, the predetermined time is changed based on the degree of change of the target value or the oil temperature, so that the responsiveness of the hydraulic pressure can be improved to the maximum without causing overshoot.
[0028]
Furthermore, it detects whether or not a signal having the same polarity as that of the signal to be output at the time of the event occurrence has already been output before the time of the interruption, and a signal having the same polarity as the polarity of the signal to be output at the time of the event occurrence. When the signal has already been output before the interruption, the predetermined time may be counted from the time when the signal of the same polarity starts to be output. As described above, when the starting point for counting the predetermined time is changed, the open state or the off state of the duty solenoid valve is not continued more than necessary, and appropriate control is particularly performed in preventing overshoot. Becomes possible.
[0029]
Note that the polarity of the “on” of the duty pulse in the duty pulse cycle does not always correspond to the “increase” of the controlled hydraulic pressure, and may be opposite depending on the circuit configuration. What is important in the present invention is that the controlled hydraulic pressure is determined by the polarity of "on (or off)" generated at the beginning of the duty pulse cycle, not the correspondence between the "on" and "off" polarities and the "pressure increase" and "pressure reduction". The direction of change is the same as the direction in which the target value is to be changed by the occurrence of an event.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0031]
The embodiment described below relates to a shift control device of an automatic transmission that performs clutch-to-clutch control by controlling a clutch engagement pressure by a duty solenoid valve. However, the present invention is not limited to this.
[0032]
FIG. 1 is a schematic configuration diagram of a shift control device for an automatic transmission according to an embodiment of the present invention.
[0033]
This automatic transmission includes a torque converter 2 and a transmission unit 4. The torque converter 2 includes a pump 12 connected to an engine output shaft 10, a stator 16 and a turbine 18 connected to a transmission case 15 by a one-way clutch 14. The turbine 18 is connected to an input shaft 20 of a transmission. The input shaft 20 of the transmission is connected to a high gear pair 22 via a high gear clutch CH (high speed clutch) and a low gear clutch CL (low speed clutch). ) Is connected to the low gear pair 24. The high gear pair 22 includes a driving gear 22a and a driven gear 22b, and the low gear pair 24 includes a driving gear 24a and a driven gear 24b.
[0034]
The driven gears 22b and 24b of each gear pair 22 and 24 are connected to the output shaft 26 of the transmission, and always rotate the same.
[0035]
The release or engagement of each of the clutches CH and CL is performed by driving a duty solenoid valve (described later) in the hydraulic control device 30 based on a command from the computer 40. The computer 40 receives signals from various sensor groups 50, for example, a vehicle speed signal (a signal of the rotation speed of the output shaft 26) from a vehicle speed sensor 51, a throttle opening signal (an accelerator opening signal) from a throttle sensor 52, and a shift position. In addition to a basic signal such as a shift position signal from the switch 53 and a foot brake signal from the brake switch 54, a signal of the rotation speed (turbine rotation speed) NT of the transmission input shaft 20 from the input shaft speed sensor 55 and the like. An oil temperature detection signal and the like from the oil temperature sensor 56 are input.
[0036]
An event detecting means for detecting the occurrence of an event requesting a sudden change in the target value of the controlled hydraulic pressure; a direction in which the previous target value is to be changed by the occurrence of the event; Hydraulic pressure change direction determining means for determining whether or not the direction in which the controlled hydraulic pressure changes is the same; and a duty pulse interrupt for immediately outputting a duty pulse corresponding to the event regardless of the phase of the duty pulse cycle. The computer 40 plays the role of the output means and the like.
[0037]
FIG. 2 shows a hydraulic control circuit of the low gear clutch CL. In this embodiment, the present invention is applied to the control of the low gear clutch CL in the case of a power-on upshift (an upshift performed when the driver is accelerating by depressing an accelerator pedal).
[0038]
A line pressure is introduced into the duty solenoid valve 60 controlled by the computer 40 from an oil passage L1. The duty solenoid valve 60 introduces oil from the oil passage L2 to the hydraulic chamber 62 of the low gear clutch CL and drains from the oil passage L3 according to the ratio of the ON signal and the OFF signal in the duty pulse cycle. Note that the duty solenoid valve 60 in this embodiment is set in advance so that the duty pulse cycle starts from ON.
[0039]
The low gear clutch CL is a multi-plate clutch, and when hydraulic pressure is introduced into the hydraulic chamber 62, the piston moves and the clutch plate 66 is pressed, so that the clutch plate 66 and the mating clutch plate 68 are engaged. It is configured. Note that an accumulator 70 is provided in the oil passage L2.
[0040]
FIG. 3 shows a shift time chart of a power-on upshift of the clutch-to-clutch according to the present embodiment.
[0041]
In this clutch-to-clutch, shifting is basically performed by switching from a state of high gear clutch CH-disengagement and low gear clutch CL-engagement to a state of high gear clutch CH-engagement and low gear clutch CL-disengagement. Here, if the oil pressure of the low gear clutch CL is reduced too quickly (relative to the increase of the oil pressure of the high gear clutch CH), the torque capacity that can be transmitted by the low gear clutch CL is increased by the transmission torque that the low gear clutch CL should bear. Since the capacity is lower than the capacity, the low gear clutch CL starts to slip, and accordingly, the engine blows up. When an engine blow-up is detected, it is necessary to immediately increase the pressure of the low gear clutch CL and control the direction of re-engagement so as to suppress this.
[0042]
FIG. 4 is a flowchart showing the flow of control in this embodiment.
[0043]
In this flow chart, the present invention is applied to a case where the occurrence of an engine blow-up in such a clutch-to-clutch shift is regarded as a broad event occurrence, and the hydraulic pressure (controlled hydraulic pressure) of the low gear clutch CL is rapidly increased accordingly. Have applied.
[0044]
More specifically, this flowchart divides the occurrence of an event into first and second cases according to the degree of engine blow-up, and executes the control 1 when it is determined that the first event has occurred. This is a combination of the first embodiment for executing the process and the second embodiment for executing the process of the control 2 when it is determined that the second event has occurred.
[0045]
The description will be made in the following order.
[0046]
In step 100, the rotational speeds of the input and output shafts 20, 26 of the transmission are calculated, and in step 110, the engine blowing amount and its average value E are calculated. Thereafter, in step 120, the engine blowing amount (averaged value) E is compared with a predetermined value K to determine whether or not the engine has been blown up. If the engine has not been blown up, the process returns immediately because the event according to the present invention is not considered.
[0047]
In addition, as a method of detecting the engine blow-up due to the occurrence of slippage of the low gear clutch CL, the magnitude of the transmission input rotation speed or the engine rotation speed is compared with (transmission output shaft rotation speed × low gear ratio). Alternatively, a change over time in the transmission input shaft rotation speed or the engine rotation speed may be detected.
[0048]
As shown in FIG. 3, when the engine blowing amount E becomes larger than the predetermined value K and it is detected that the engine blowing has occurred, the process proceeds to the next step 130 (calculated in other main flows at all times). ) Of the low gear clutch CL (equivalent to the target value of the controlled hydraulic pressure) D. The change width Ddef is obtained as an absolute value of the latest hydraulic pressure instruction value Dn-the previous hydraulic pressure target value Dn-1.
[0049]
In step 131, the change width Ddef is compared with the predetermined value k1 to determine whether the “first event” according to the present invention has occurred. Needless to say, the larger the engine blowing amount E is, the larger the change width Ddef is calculated. Therefore, the variation width Ddef can be understood as being synonymous with the variation width Edef of the engine blowing amount E as far as this embodiment is concerned. Furthermore, since the change width Ddef also corresponds to the on / off ratio of the duty pulse period, it can be understood as having the same meaning. Therefore, when detecting whether or not an event has occurred, any of these parameters may be focused on.
[0050]
If the change width Ddef of the hydraulic pressure instruction value D is smaller than the predetermined value k1, (the control proceeds to step 160, assuming that the “first event” according to the present invention has not occurred, and the normal duty as shown in FIG. 3). By the control, feedback control for suppressing the engine from rising is performed.
[0051]
On the other hand, if Ddef ≧ k1 is satisfied in step 130, it is determined that at least the first event related to control 1 has occurred, and the process proceeds to step 140. In step 140, it is determined whether Ddef> k2 holds in order to determine whether the second event relating to control 2 has occurred.
[0052]
If k1 ≦ Ddef ≦ k2, the first event (only) relating to control 1 has occurred, and the flow proceeds to step 150. If Ddef> k2, the second event has occurred. Then, the process proceeds to step 180.
[0053]
In step 150, the direction in which the oil pressure command value D (oil pressure target value) of the oil pressure (controlled oil pressure) of the low gear clutch CL is to be changed by the occurrence of the first event, and the low gear clutch CL It is determined whether the direction in which the hydraulic pressure (controlled hydraulic pressure) changes is the same direction.
[0054]
In the present embodiment, since the present invention is intended to prevent the engine from blowing up when the release of the low gear clutch CL is too fast, the hydraulic pressure of the low gear clutch CL (controlled hydraulic pressure) is generated by the occurrence of the first event. Always changes from low to high. The initial phase of the duty pulse cycle is also set in advance so as to start from ON (supply side) as described above. Therefore, the “direction in which the hydraulic pressure target value is to be changed” and the “direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle” always coincide with the occurrence of the first event. The result is always Yes and the process proceeds to step 170. That is, as far as this embodiment is concerned, the determination in step 150 is basically unnecessary.
[0055]
However, depending on the type of event, the change direction of the hydraulic pressure target value is not always determined as in the present embodiment, and it may not be known in advance from which duty pulse cycle to start. In this case, the determination of step 150 is necessary to change the flow to step 160 or step 180 (because it is not appropriate to execute control 1 if the direction is reversed).
[0056]
In steps 170 and 180, control 1 or control 2 is executed, and in step 190, a duty pulse output operation is executed by interruption processing based on the execution of control 1 or control 2.
[0057]
FIG. 5 shows the processing contents of the control 1 in step 170.
[0058]
First, in step 172 (assuming the first event has occurred), the phase of the duty pulse cycle of the duty solenoid valve 60 of the low gear clutch CL is reset in order to quickly re-engage the low gear clutch CL. In step 174, a duty pulse having a duty ratio corresponding to the oil pressure instruction value D after the occurrence of the first event is output (in the duty pulse cycle after the reset). Further, in step 176, feedback control is performed so that the engine blowing amount E is constant in order to suppress the engine blowing up.
[0059]
As a result, as shown in FIG. 6, for example, a duty pulse corresponding to the new oil pressure instruction value D can be output immediately after the time point B at which the event occurs. In this case, in the direction in which the hydraulic pressure of the low gear clutch CL, which is the controlled hydraulic pressure, changes (from low to high: increasing pressure) and in the initial period of the duty pulse cycle of the duty solenoid valve 60, the direction in which the controlled hydraulic pressure changes (on: increasing). ), The hydraulic pressure of the low gear clutch CL is immediately increased from the (first) event occurrence point B, and no dead time t3 due to the phase shift of the duty pulse cycle is generated.
[0060]
Next, the processing contents of the control 2 are shown in FIG.
[0061]
The control 2 is executed when the change width Ddef of the hydraulic pressure instruction value is equal to or more than the predetermined value k2 in step 140 of FIG. 4 (when it is determined that the second event according to the control 2 has occurred). The duty solenoid valve 60 is forcibly turned on (supply side) for a predetermined time T1 from the time point B of occurrence of the second event (when it is determined that Ddef ≧ k2: the same as the time point of occurrence of the first event), and the hydraulic pressure target is quickly set. Value.
[0062]
That is, in the method according to the control 1, even if the (first) event occurs at any timing, a duty pulse having a duty ratio corresponding to a new oil pressure instruction value can be immediately output from the time of occurrence of the event. Since the duty ratio is to finally achieve the oil pressure instruction value (after passing through several duty pulse periods), the duty ratio is not 100%. A signal of the opposite polarity will be output. Therefore, in the latter half of each duty pulse cycle, the hydraulic pressure of the low gear clutch CL is increased toward the target value in a state where the hydraulic pressure is controlled so as to be directed in the opposite direction (release side). As a result, a rapid pressure increase is hindered.
[0063]
The control 2 forcibly turns on the duty solenoid valve 60 for a predetermined time T (T1 in the embodiment of FIG. 7) in order to prevent this problem. Thus, the hydraulic pressure of the low gear clutch CL can be increased with the hardware-like fastest response characteristic of the duty solenoid valve 60.
[0064]
Specifically, as shown in FIG. 7, first, the process proceeds to step 184 via step 182, the phase of the duty pulse cycle is reset, and an ON signal is output.
[0065]
At the same time, in step 185, the predetermined time (time during which the duty solenoid valve 60 is on) T1 is set. The predetermined time T1 may be set to a fixed value in advance, or may be corrected depending on the oil temperature or the like as described later. In step 186, the flag F indicating that the predetermined time T1 has been set is set to 1.
[0066]
In step 188, it is determined whether or not the predetermined time T1 has elapsed. If the predetermined time T1 has not yet elapsed, the flow returns to step 182, where it is determined whether or not the flag F is 1. Since the flag F has been set to 1 in step 186, it is determined to be 1 at this stage, so that steps 184 to 186 are bypassed and the determination in step 188 is repeated.
[0067]
Eventually, when it is determined in step 188 that the predetermined time T1 has elapsed, the process proceeds to step 189, and feedback control is performed in accordance with the amount of blow-up of the engine. The flag F is reset to 0 here.
[0068]
According to this control flow, a procedure for starting the feedback control after the ON output is maintained for a predetermined time T1 after the occurrence of the (second) event is realized. As a result, the hydraulic pressure can be increased at the maximum speed of the hardware system.
[0069]
Next, another embodiment relating to the setting of the predetermined time T1 or the calculation will be described.
[0070]
The control 2 immediately outputs a 100% hydraulic pressure instruction value D to the duty solenoid valve 60 for a predetermined time T1 when the (second) event occurs. In this case, as shown in FIG. 8, for example, when the timing of the event occurrence is the off state in the duty pulse cycle, the duty solenoid valve 60 is immediately turned on, so that the hydraulic pressure is maintained for a predetermined time T1. There is no particular problem because of the rise. However, as shown in FIG. 9, when an event occurs in the ON state in the duty pulse cycle, the ON state has already continued for t0 at the time of occurrence of the event. If the ON (supply) is continued only for T1, the substantial predetermined time T becomes T2. This phenomenon causes an overshoot of the hydraulic pressure.
[0071]
Therefore, in the control flow shown in FIG. 10, steps 183-1 to 183-3 are added after step 182 in FIG. 7 and step 185-1 is added after step 185. That is, after the value of the flag F is confirmed in step 182, it is determined in step 183-1 whether or not the output is on at this time (ie, the time when the second event occurs). When it is determined that the ON output is being performed, the process proceeds to step 183-2, and the ON time t0 output (already) before the occurrence of the event is confirmed from the output history information. On the other hand, when it is determined that the ON output is not being performed, the ON time t0 is set to zero in step 183-3. Thereafter, steps 184 and 185 similar to those described above are executed. In step 185-1, a value obtained by subtracting the on-time t0 from the predetermined time T1 is calculated, and the reduced value is calculated as a (new) predetermined time. It is replaced and set as T3. By performing this process, the predetermined time T3 counted in step 188 'is shorter by the time t0, and therefore, as shown in FIG. 11, the ON time substantially always has the same length as the preceding predetermined time T1. Thus, the overshoot of the hydraulic pressure can be effectively prevented.
[0072]
Note that the other steps are the same as the steps in FIG. 7 described above, and thus redundant description will be omitted.
[0073]
Next, another embodiment for setting the predetermined time T will be described with reference to FIG.
[0074]
The control flow of FIG. 12A is executed instead of step 185 in FIG. 7 or FIG.
[0075]
First, at step 185-11, the oil temperature of the automatic transmission is detected by the oil temperature sensor 56 (FIG. 1). However, when the dedicated oil temperature sensor 56 is not provided as described above, the oil temperature of the automatic transmission may be estimated from, for example, information on the engine cooling water temperature. In step 185-12, a (corrected) predetermined time T4 is set depending on the detected oil temperature. Specifically, the corrected predetermined time T4 may be obtained from a map of T4 corrected and set in advance depending on the oil temperature, or the (original) predetermined time T1 may be determined according to the oil temperature. It may be determined by an operation such as multiplying by a correction coefficient.
[0076]
This correction is qualitatively performed such that the lower the oil temperature, the longer the predetermined time T4. This is because the lower the oil temperature, the higher the viscosity of the oil and the longer the rise of the oil pressure.
[0077]
By correcting and setting the predetermined time T in this manner, it is possible to quickly raise the hydraulic pressure regardless of the oil temperature (without overshooting).
[0078]
In setting the predetermined time T, various other modified examples are further conceivable.
[0079]
For example, in the embodiment described so far, the case where the control 1 is executed or the control 2 is executed according to the value of the change width Ddef of the hydraulic pressure instruction value D is divided. In setting the time T1, the value of the change width Ddef is not particularly considered.
[0080]
However, when the change width Ddef is large, it can be estimated that the demand for changing the hydraulic pressure is correspondingly high. Further, when the variation width Ddef is large, the time required for the oil pressure to reach the target value after the occurrence of the event becomes longer accordingly. Therefore, if the predetermined time T is set to be the same, the oil pressure has not yet reached the target value. A duty pulse having a duty ratio (corresponding to the target value) is output from the inside. As a result, in the latter half of each duty pulse cycle, hydraulic control in the reverse direction is performed, and a rapid increase in hydraulic pressure is hindered accordingly.
[0081]
Accordingly, as shown in FIG. 12B, in step 185-21, the value of the change width Ddef is confirmed, and if the predetermined time T5 is set depending on the value of the change width Ddef, the overshoot will occur. Without increasing the pressure, the hydraulic pressure can be increased to the target value more quickly.
[0082]
In addition, the predetermined time T can be freely set depending on the purpose of the control sequence to which the present invention is applied and depending on other parameters in order to achieve the purpose more rationally.
[0083]
For example, when the present invention is applied to increase / decrease control of braking pressure for realizing vehicle attitude control and a sequence of increasing (or decreasing) hydraulic pressure when a certain condition is satisfied, If it is better that the increasing speed (or the decreasing speed) is changed depending on the vehicle speed, the predetermined time T may be changed depending on the vehicle speed. In this case, the predetermined time T set in step 185 may be changed depending on the vehicle speed in the same control flow as in FIGS. 12A and 12B described above.
[0084]
As described above, in the present invention, how to determine the predetermined time T is not limited, and the present invention is not limited to the oil temperature, the change width, etc., but also depends on the application target of the present invention or the nature of the event. It can be changed and set as appropriate.
[0085]
As described above, the present invention, for example, in addition to the case where engine blowing is detected during clutch-to-clutch shift of an automatic transmission, when increasing or decreasing the braking oil pressure in the vehicle attitude control, the anti-skid brake control control increases the braking oil pressure. When increasing or decreasing, the same applies when an event that requires a sudden change in hydraulic pressure occurs in various controls using the duty solenoid valve, such as when increasing or decreasing the clutch hydraulic pressure in four-wheel drive torque distribution control. And a corresponding effect can be obtained.
[0086]
In the above-described embodiment, an example is shown in which the duty pulse cycle starts from (the polarity of) and the controlled oil pressure is increased when the duty pulse cycle is on. May start. In addition, the controlled hydraulic pressure may be reduced when it is turned on.
[0087]
Even in such a case, if it is confirmed that the direction in which the target value of the controlled hydraulic pressure changes due to the occurrence of the event and the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle are identical, The invention can be applied without error.
[0088]
【The invention's effect】
As described above, according to the present invention, even when an event occurs in which the target value of the controlled hydraulic pressure of the hydraulic control device needs to be suddenly changed, the dead time until the hydraulic pressure target value is reached. And the hydraulic response delay can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an automatic transmission to which the present invention is applied.
FIG. 2 is a hydraulic control circuit showing an engagement side clutch in the automatic transmission.
FIG. 3 is a time chart showing an upshift characteristic in the embodiment.
FIG. 4 is a flowchart showing a control routine executed in the embodiment.
FIG. 5 is a flowchart showing a process of control 1 in the above flowchart.
FIG. 6 is a diagram showing a change in a duty pulse by control 1;
FIG. 7 is a flowchart showing a process of control 2 in the above flowchart.
FIG. 8 is a diagram showing a change in a duty pulse by control 2;
FIG. 9 is a diagram showing a change in a duty pulse according to control 2;
FIG. 10 is a flowchart showing another embodiment of control 2;
11 is a diagram showing a change in a duty pulse by control 2 in FIG. 10;
FIG. 12 is a flowchart showing an example of another embodiment relating to a predetermined time.
FIG. 13 is a diagram showing a change in a duty pulse in a conventional control and an intermediate development example.
[Explanation of symbols]
2. Torque converter
4 ... Transmission section
10. Engine output shaft
12 ... Pump
14. One-way clutch
15… Case
16 ... Stator
18. Turbine
20: Transmission input shaft
22 High gear pair
24 ... Low gear pair
26 ... Transmission output shaft
30 ... Hydraulic control device
40 ... Computer
50 ... various sensor groups
60: Duty solenoid valve
CH… High gear clutch
CL: Low gear clutch

Claims (6)

It has a duty solenoid valve that repeatedly generates ON and OFF duty pulses at a predetermined duty pulse cycle, and controls the duty ratio of the controlled hydraulic pressure by controlling the ratio of the ON time and OFF time of the duty pulse in each duty pulse cycle. In the control device of the hydraulic control device to be
Means for detecting the occurrence of an event requesting that the target value of the controlled hydraulic pressure be suddenly changed;
Means for determining whether the direction in which the target value is to be changed by the occurrence of the event is the same as the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle,
When it is determined that the direction in which the event occurs and the target value is to be changed by the occurrence of the event is the same as the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle, Means for immediately interrupting and outputting a duty pulse corresponding to a new target value based on the event, regardless of the phase of the duty pulse cycle being output at the time;
A control device for a hydraulic control device, comprising: It has a duty solenoid valve that repeatedly generates ON and OFF duty pulses at a predetermined duty pulse cycle, and controls the duty ratio of the controlled hydraulic pressure by controlling the ratio of the ON time and OFF time of the duty pulse in each duty pulse cycle. In the control device of the hydraulic control device to be
Means for detecting that an event has occurred that requires the target value of the controlled hydraulic pressure to be suddenly changed in a direction predetermined to increase or decrease the pressure,
Means for presetting such that the direction in which the target value is to be changed by the occurrence of the event and the direction in which the controlled hydraulic pressure changes at the beginning of the duty pulse cycle are the same,
Means for immediately interrupting and outputting a duty pulse corresponding to a new target value based on the event, regardless of the phase of the duty pulse cycle being output at that time when the event occurs;
A control device for a hydraulic control device, comprising: It has a duty solenoid valve that repeatedly generates ON and OFF duty pulses at a predetermined duty pulse cycle, and controls the duty ratio of the controlled hydraulic pressure by controlling the ratio of the ON time and OFF time of the duty pulse in each duty pulse cycle. In the control device of the hydraulic control device to be
Means for detecting the occurrence of an event requesting that the target value of the controlled hydraulic pressure be suddenly changed;
When the event occurs, a signal of a polarity that causes a change in the controlled hydraulic pressure in the same direction as the direction in which the target value is to be changed by the occurrence of the event, among the on or off signals of the duty pulse. Means for immediately interrupting and outputting for a predetermined time regardless of the phase of the duty pulse cycle being output at that time;
A control device for a hydraulic control device, comprising: In claim 3, further,
Means for detecting a change width of a target value of the controlled hydraulic pressure that changes due to the occurrence of the event,
Means for changing the predetermined time according to the change width;
A control device for a hydraulic control device, comprising: In claim 3, further,
Means for detecting oil temperature;
Means for changing the predetermined time according to the oil temperature;
A control device for a hydraulic control device, comprising: In claim 3, further,
A signal having the same polarity as the polarity of the signal to be output at the time of the event occurrence is provided, which detects whether or not the signal has already been output before the time of the interruption.
When a signal having the same polarity as the polarity of the signal to be output when an event occurs is already output before the time of the interrupt, the predetermined time is counted from the time when the signal of the same polarity starts to be output as a starting point. A control device for a hydraulic control device.

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