JP3856485B2 - Control device for automatic transmission - Google Patents

Description

[0001]
[Industrial application fields]
The present invention mainly relates to a control device for an automatic transmission, and more particularly to control during shifting.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a control device for an automatic transmission is known as described in Japanese Utility Model Publication No. 63-105247 shown in FIG.
[0003]
Such an apparatus mainly includes an automatic transmission 1, an engine 2, and a control unit (ECU) 3 that controls the automatic transmission 1 and the engine 2.
[0004]
The control unit 3 is provided with torque reducing means for controlling the fuel injection amount from the fuel injection valve 4. During this shift by the automatic transmission 1, the torque reduction means suppresses or cuts the fuel injection amount to reduce the torque of the engine 2 to reduce the shift shock.
[0005]
On the other hand, the vehicle engine 2 is provided with an exhaust gas recirculation device that recirculates a part of the exhaust gas to the intake passage or the combustion chamber in order to reduce NOx (nitrogen oxide), which is a toxic component in the exhaust gas. EGR) is known (see Japanese Patent Application Laid-Open No. 62-210251). A method of using such an exhaust gas recirculation device as the torque reducing means is also described in Japanese Utility Model Laid-Open No. 63-105247.
[0006]
Further, a torque reducing means for changing the ignition timing by using the fuel injection timing as a variable control is also described in Japanese Utility Model Laid-Open No. 63-105247.
[0007]
In this type of automatic transmission control device, the automatic transmission economy pattern described in JP-A-64-87864 increases the exhaust gas recirculation amount to improve fuel efficiency. Etc. are known.
[0008]
[Problems to be solved by the invention]
However, in such a conventional automatic transmission control device, the shift shock is reduced by suppressing or cutting the fuel injection amount from the fuel injection valve 4 to reduce the torque of the engine 2.
[0009]
For this reason, if the engine 2 is not warmed immediately after startup or the like and a warm-up operation is required, if the fuel injection amount from the fuel injection valve 4 is suppressed or cut, the torque reduction amount is too large, and the engine There is a possibility that 2 may stop and there is a problem that the warm-up speed is slow.
[0010]
In addition, when using on-vehicle equipment such as an air conditioner and a hydraulic active suspension, if the fuel injection amount from the fuel injection valve 4 is suppressed or cut, the torque reduction amount is too large, and the engine 2 There was a problem that the warm-up speed was slow as well as the possibility of stopping.
[0011]
In addition, in the case of a diesel engine vehicle, if the torque reduction means such as changing the ignition timing is used with variable fuel injection timing as in a gasoline engine vehicle, the device becomes expensive and the manufacturing cost increases. There was a problem such as.
[0012]
Further, for example, if a method of changing the ignition timing by adopting the fuel injection timing as a variable control in a diesel engine is employed, there is a possibility of causing engine knocking.
[0013]
Therefore, an object of the present invention is to provide a control device for an automatic transmission that can sufficiently warm up and suppress a shift shock and that is suitable for use in a diesel engine vehicle or the like.
[0017]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided an automatic transmission control means for controlling an automatic transmission and a shift shock by reducing the torque of the engine during a shift by the automatic transmission. And a torque reduction means for reducing , and the torque reduction means has a fuel injection control unit for reducing or reducing the engine torque by suppressing or cutting the fuel injection amount, and circulating the engine exhaust to the intake side, In an automatic transmission control apparatus having an exhaust gas recirculation control unit for reducing engine torque, the torque reduction means is a case where an on-vehicle equipment is operated, and a throttle opening is low and a change amount of a transmission gear ratio. Is small, it is determined that the amount of torque required to reduce the shift shock is small, and the engine exhaust during the shift by the automatic transmission When the exhaust gas recirculation that recirculates to the intake side is performed to reduce the engine torque and the on-vehicle equipment is not operated, it is determined that the amount of torque reduction necessary to reduce the shift shock is large, An automatic recirculation that recirculates engine exhaust to the intake side during a shift by the automatic transmission reduces the engine torque, and further, the fuel injection control unit suppresses or cuts the fuel injection amount to reduce the engine torque. It features a transmission control device.
[0018]
According to a second aspect of the present invention, the torque reducing means has a high throttle opening and a change in the transmission gear ratio even when the torque reduction request is made and the on-vehicle equipment is operated. If the amount is large, it is judged that the amount of torque required to reduce the shift shock is large, and the engine torque is reduced by performing the exhaust gas recirculation that returns the engine exhaust to the intake side at the time of shifting by the automatic transmission. The automatic transmission control device according to claim 1 , wherein the fuel injection control unit further reduces or reduces the engine torque by suppressing or cutting the fuel injection amount .
[0019]
According to a third aspect of the present invention, there is provided an automatic transmission control means for controlling the automatic transmission, and a torque reduction means for reducing the shift shock by reducing the torque of the engine during a shift by the automatic transmission. The torque reducing means includes a fuel injection control unit that reduces or reduces the engine torque by suppressing or cutting the fuel injection amount, and exhaust gas recirculation that reduces engine torque by circulating engine exhaust to the intake side. In the control device for an automatic transmission having a control unit, the torque reducing means performs exhaust gas recirculation for recirculating engine exhaust to the intake side at the time of a shift by the automatic transmission when a torque reduction request is made. If it is determined that the amount of torque reduction necessary to reduce shift shock is large, the automatic transmission That together with exhaust gas recirculation for recirculating engine exhaust to the intake side during transmission, further, by the fuel injection control unit, the amount of fuel injection inhibited or cut is characterized in the control device for an automatic transmission that reduces the engine torque.
[0025]
[Operation]
According to the first aspect of the present invention, the engine torque is reduced by the exhaust gas recirculation when the torque reduction necessary amount for reducing the shift shock is small .
For this reason, even if the engine output decreases due to the operation of the on-vehicle equipment, the warmed-up engine exhaust is circulated to the intake side so that sufficient warm-up operation can be performed, and the possibility that the engine stops is reduced.
In addition, when the on-vehicle equipment is not operated, the fuel injection control unit suppresses or cuts the fuel injection amount to reduce the engine torque.
For this reason, when the on-vehicle equipment is not operated, the peak torque with good response can be cut, and the automatic transmission enables a smooth shift with reduced shock.
Moreover, since the required torque reduction required amount is determined using the shift type information of the throttle opening and the change amount of the transmission gear ratio, the exhaust gas recirculation amount is varied by opening and closing the valve or the like, and according to the situation, Shift shock can be reduced appropriately.
[0026]
According to the second aspect of the present invention, the fuel injection amount is further suppressed or cut by the fuel injection control unit in a traveling state where the throttle opening is high and the change amount of the transmission gear ratio is large. Engine torque decreases.
For this reason, in addition to the exhaust gas recirculation by the exhaust gas recirculation control unit, it is possible to secure a wide necessary torque decrease width corresponding to the torque decrease width due to the fuel cut, and it is possible to cope with various shift shock reductions.
[0027]
Furthermore, according to what is described in claim 3, Using the shift type information of the throttle opening and the change amount of the transmission gear ratio, the necessary torque reduction required amount is judged, and the exhaust gas recirculation amount is varied by opening and closing of a valve or the like, or the fuel injection amount is suppressed. Alternatively, the engine torque can be reduced by cutting.
For this reason, the shift shock can be appropriately reduced according to the situation.
[0032]
For example, even if this device is applied to a diesel engine, there is no possibility of causing engine knocking.
[0033]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0034]
1 and 2 show a first embodiment of the present invention. The same or equivalent parts as in the conventional example will be described with the same reference numerals.
[0035]
First, the configuration will be described. Reference numeral 5 in the figure denotes the control device system of the first embodiment, and mainly an engine control unit 7 as engine control means for controlling the diesel engine 6 as the engine of the first embodiment. And an AT control unit 9 which is connected to the engine control unit 7 and performs automatic transmission control of the automatic transmission (AT) 8 as an automatic transmission control means.
[0036]
Among these, the engine control unit 7 is provided with torque reducing means 10 for reducing the shift shock by reducing the torque of the diesel engine 6 at the time of shifting by the automatic transmission 8.
[0037]
The diesel engine 6 is provided with a fuel injection valve 4 so that fuel injection and fuel cut can be performed for each cylinder.
[0038]
The diesel engine 6 is provided with an exhaust gas recirculation pipe 13 that is connected to the exhaust side manifold 11 and the intake side manifold 12 to recirculate the engine exhaust gas to the intake side and reduce exhausted NOx. The exhaust gas recirculation pipe 13 is provided with a variable valve 14 so that the exhaust gas recirculation amount can be adjusted by an actuator (not shown).
[0039]
Further, the diesel engine 6 is provided with a water temperature sensor 15 for detecting the coolant temperature. The water temperature sensor 15 is connected to the engine control unit 7 and outputs a coolant temperature signal to the engine control unit 7.
[0040]
The AT control unit 9 outputs a torque reduction necessity signal and shift type information to the engine control unit 7 at the time of shifting.
[0041]
The engine control unit 7 is connected to a throttle opening degree detection unit 16 including a throttle opening degree sensor (not shown). The throttle opening detection unit 16 is configured to output the detected throttle opening signal to the engine control unit 7.
[0042]
The torque reducing means 10 is mainly composed of a fuel injection control unit 17 and an exhaust gas recirculation control unit 18.
[0043]
Among these, the fuel injection control unit 17 is configured to be able to variably control the fuel injection amount for the fuel injection valve 4 provided in the diesel engine 6 according to the throttle opening signal and the speed change type. ing.
[0044]
When the amount of torque torque reduction required for the shift is large as judged from the throttle opening signal and the shift type, a fuel cut signal for cutting off the inflow of fuel into some of the combustion chambers is sent to the fuel injection valve 4. To output.
[0045]
Further, the exhaust gas recirculation control unit 18 is configured to control the exhaust gas recirculation amount by opening and closing the variable valve 14 in accordance with the cooling water temperature signal so as to vary the torque reduction amount.
[0046]
Then, when the cooling water temperature signal is equal to or lower than a predetermined value, it is determined that the diesel engine 6 needs a warm-up operation, and the variable valve 14 is opened to perform exhaust gas recirculation to the intake side manifold 12. Configured to do.
[0047]
Next, the operation of the first embodiment will be described with reference to the flowchart of FIG.
[0048]
First, when the ignition switch is turned on at Step 1 and the diesel engine 6 is started, the diesel engine 6 is in a low-temperature state until it is gradually warmed with time. In this low temperature state, since the cooling water is also low temperature, the cooling water temperature signal detected by the water temperature sensor 15 is transmitted to the engine control unit 7 as a signal indicating a low temperature state. The torque reducing means 10 of the engine control unit 7 determines that the diesel engine 6 needs to be warmed up in response to the coolant temperature signal.
[0049]
When traveling in this state, if the AT control unit 9 is not shifting at Step 2, the AT control unit 9 does not output a torque reduction necessary signal. For this reason, the engine control unit 7 determines that there is no torque reduction request, proceeds to Step 7, ends this routine, and returns to Step 1 again.
[0050]
When the AT control unit 9 performs a shift, a torque reduction necessity signal is output from the AT control unit 9 to the engine control unit 7. For this reason, the engine control unit 7 determines that there is a torque reduction request, and proceeds to Step 3.
[0051]
In Step 3, when it is determined that the cooling water temperature is low, the process proceeds to Step 4. Moreover, if the said cooling water temperature rises with progress of time, it will transfer to Step6.
[0052]
In Step 4, when the throttle opening is high and the change in the gear ratio is large by the throttle opening signal detected by the throttle opening detection unit 16, the engine control unit 7 It is determined that the required amount of torque reduction is large, and the process proceeds to Step 6. Further, when the throttle opening is low and the change amount of the gear ratio is small, that is, the transmission gear ratio is low, the engine control unit 7 determines that the required torque reduction amount is small, and proceeds to Step 5.
[0053]
In Step 5, the exhaust gas recirculation control unit 18 opens the variable valve 14 provided in the exhaust gas recirculation pipe 13, and performs exhaust gas recirculation to recirculate engine exhaust gas to the intake side manifold 12, thereby reducing the engine torque.
[0054]
For this reason, it was warmed immediately after the start of the diesel engine 6 without reducing the output of the diesel engine 6 as compared with the conventional one in which the fuel injection amount is suppressed or cut to reduce the torque of the diesel engine 6. The engine exhaust is recirculated to the intake side manifold 12 so that sufficient warm-up operation can be performed.
[0055]
Since the exhaust gas recirculation amount can be easily changed by opening and closing the variable valve 14, it is possible to cope with various torque reduction widths that are required differently in the situation, and to appropriately reduce the shift shock.
[0056]
In Step 6, the torque reduction means 10 determines the amount of torque reduction required for the shift shock, for example, when traveling at a high throttle opening and a high gear ratio, based on the throttle opening detected by the throttle opening detector 16. When there are many, in addition to the exhaust gas recirculation by the exhaust gas recirculation control unit 18, the fuel injection control unit 18, which is another engine speed control, performs fuel cut to stop the combustion for a predetermined number of cylinders. Reduce torque.
[0057]
For this reason, in addition to the torque reduction range due to exhaust gas recirculation, a wide required torque reduction range can be secured by the torque reduction range due to fuel cut, and various shift shocks can be reduced. In addition, if the torque is reduced by cutting the fuel after the warm-up of the diesel engine 6 is completed, the peak torque can be cut with a good response, and the AT control unit 9 can perform a smooth shift with reduced shock.
[0058]
In the first embodiment, the engine control by the engine control unit 7 is performed by the fuel cut of the fuel injection control unit 17. For this reason, even if this automatic transmission control device is applied to the diesel engine 6, as in the past, the fuel injection timing is variably controlled, and an expensive device such as changing the ignition timing is not required, It can be implemented with a simple configuration. For this reason, there is no possibility that manufacturing cost will increase.
[0059]
In addition, in the first embodiment, the exhaust gas recirculation pipe 13 and the variable valve 14 conventionally used for reducing NOx are used to perform exhaust gas recirculation to reduce the torque. The number of parts is small, and the manufacturing cost is further reduced.
[0060]
When the shift in which the shift shock is suppressed is completed in Step 5 or Step 6, the process proceeds to Step 7, the routine is terminated, and the process returns to Step 1 again.
[0061]
FIG. 3 illustrates a control device for an automatic transmission according to a second embodiment of the present invention.
[0062]
In the control device for the automatic transmission of the second embodiment, in-vehicle equipment such as an air conditioner and a hydraulic active suspension that require the engine output instead of detecting the coolant temperature in Step 3 of the first embodiment. By detecting the ON / OFF state of the engine, a decrease in the output of the diesel engine 6 is determined.
[0063]
Therefore, in Step 3, when the in-vehicle equipment is in the ON state, the engine control unit 7 determines that the output is reduced, and proceeds from Step 4 to Step 5, and the in-vehicle equipment is turned off. When it is in the state, the engine control unit 7 is configured to determine that the output has not decreased and proceed to Step 6.
[0064]
Next, the operation of the second embodiment will be described with a focus on the differences from the operation of the first embodiment.
[0065]
When the engine control unit 7 determines that there is a torque reduction request at Step 2, when the on-vehicle equipment is operating in the 0N state at Step 3, the torque reduction means 10 proceeds to Step 4 and Step 5, Exhaust gas recirculation is performed so that engine exhaust gas is recirculated to the intake side manifold 12 during a shift by the automatic transmission 8 to reduce the engine torque.
[0066]
For this reason, compared with what reduces or cuts the torque of the engine 2 by suppressing or cutting the conventional fuel injection amount, for example, the operation of on-vehicle equipment such as an air conditioner has warmed even if the engine output is reduced. The engine exhaust is recirculated to the intake side manifold 12 so that sufficient warm-up operation can be performed.
[0067]
Other configurations and operations are substantially the same as those of the first embodiment, and thus description thereof is omitted.
[0068]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention. .
[0069]
For example, in each of the above embodiments, the fuel cut by the fuel injection control unit 17 has been described to further increase the width of the torque reduction amount. However, the present invention is not limited to this. For example, the fuel injection timing is variably controlled. Even if a device for changing the ignition timing is used, any device may be used as long as it further increases the width of the torque reduction amount.
[0070]
In each of the above embodiments, the fuel injection control unit 17 cuts the fuel to further increase the amount of torque reduction. However, the present invention is not limited to this. For example, the torque reduction by the exhaust gas recirculation is described. Of course, it may be only.
[0071]
Further, in each of the above embodiments, the diesel engine 6 has been described as an engine. However, the present invention is not limited to this, and any engine can be used as long as it can perform exhaust gas recirculation, such as a gasoline engine. It is natural to be good.
[0072]
In each of the embodiments, the water temperature sensor 15 for detecting the water temperature of the cooling water is provided, and the water temperature sensor 15 is configured to output a cooling water temperature signal to the engine control unit 7. Not limited to this, for example, by detecting the temperature of an engine field, automatic field, etc. by holding an oil temperature sensor or the like, any part of the temperature detected by any method is used as the engine temperature. If it is a thing.
[0073]
In each of the above embodiments, the engine output value (torque) has been described using the throttle opening signal detected by the throttle opening sensor. However, the present invention is not limited to this. For example, the engine air inflow amount The engine output value signal may be detected from any part by any method as long as it detects the engine output value equivalent signal even if it is configured to detect the air flow sensor etc. Is natural.
[0080]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the amount of torque reduction necessary for reducing the shift shock is small, the engine torque is reduced by the exhaust gas recirculation .
For this reason, even if the engine output decreases due to the operation of the on-vehicle equipment, the warmed-up engine exhaust is circulated to the intake side so that sufficient warm-up operation can be performed, and the possibility that the engine stops is reduced.
In addition, when the on-vehicle equipment is not operated, the fuel injection control unit suppresses or cuts the fuel injection amount to reduce the engine torque.
For this reason, when the on-vehicle equipment is not operated, the peak torque with good response can be cut, and the automatic transmission enables a smooth shift with reduced shock.
Moreover, since the required torque reduction required amount is determined using the shift type information of the throttle opening and the change amount of the transmission gear ratio, the exhaust gas recirculation amount is varied by opening and closing the valve or the like, and according to the situation, Shift shock can be reduced appropriately.
[0083]
According to the second aspect of the present invention, in the traveling state where the throttle opening is high and the change amount of the transmission gear ratio is large, the fuel injection amount is controlled by the fuel injection control unit. Suppressed or cut to reduce engine torque.
For this reason, in addition to the exhaust gas recirculation by the exhaust gas recirculation control unit, it is possible to secure a wide necessary torque decrease width corresponding to the torque decrease width due to the fuel cut, and it is possible to cope with various shift shock reductions.
[0085]
Furthermore, according to what is described in claim 3, Using the shift type information of the throttle opening and the change amount of the transmission gear ratio, the necessary torque reduction required amount is judged, and the exhaust gas recirculation amount is varied by opening and closing of a valve or the like, or the fuel injection amount is suppressed. Alternatively, the engine torque can be reduced by cutting.
For this reason, the shift shock can be appropriately reduced according to the situation.
[0086]
In addition, for example, even if the device is applied to a diesel engine, there is a practically beneficial effect that there is no risk of engine knocking.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an overall configuration of an automatic transmission control apparatus according to a first embodiment of the present invention.
FIG. 2 is a flowchart illustrating a control sequence of an automatic transmission control apparatus according to the same embodiment;
FIG. 3 is a flowchart illustrating a control sequence of an automatic transmission control apparatus according to a second embodiment;
FIG. 4 is a block diagram showing an overall configuration of a conventional automatic transmission control device.
[Explanation of symbols]
5 Control device 6 Diesel engine (engine)
7 Engine control unit (engine control means)
8 Automatic transmission 9 AT control unit (automatic transmission control means)
10 Torque reduction means 16 Throttle opening detector 17 Fuel injection controller 18 Exhaust gas recirculation controller

Claims (3)

An automatic transmission control means for controlling the automatic transmission, which has a torque reducing means for reducing the automatic transmission by the shift when the engine shift shock by reducing the torque of the said torque reducing means, fuel injection In a control device for an automatic transmission having a fuel injection control unit that reduces or cuts engine torque by reducing or cutting the amount, and having an exhaust gas circulation control unit that reduces engine torque by circulating engine exhaust to the intake side,
The torque reducing means performs exhaust gas recirculation for recirculating engine exhaust to the intake side at the time of shifting by the automatic transmission when a torque reduction request is made and the on- vehicle equipment is operated. When it is determined that the amount of torque reduction necessary to reduce the shift shock is large, exhaust gas recirculation is performed to recirculate engine exhaust to the intake side during a shift by the automatic transmission, and the fuel injection control is performed. A control device for an automatic transmission, characterized in that the engine torque is reduced by suppressing or cutting the fuel injection amount by the unit. An automatic transmission control means for controlling the automatic transmission; and a torque reduction means for reducing a shift shock by reducing the torque of the engine during a shift by the automatic transmission. In a control device for an automatic transmission having a fuel injection control unit that reduces or cuts engine torque by reducing or cutting the amount, and having an exhaust gas circulation control unit that reduces engine torque by circulating engine exhaust to the intake side,
When the on-vehicle equipment is operated, and the throttle opening is low and the change amount of the transmission gear ratio is small, the torque reduction means has a small torque reduction necessary amount for reducing the shift shock. When the shift by the automatic transmission is determined, the engine exhaust is recirculated to the intake side to reduce the engine torque, and when the on-vehicle equipment is not operated, the shift shock is reduced. It is determined that the required amount of torque reduction required for the engine is large, exhaust recirculation that recirculates engine exhaust to the intake side at the time of shifting by the automatic transmission is performed to reduce engine torque, and further, the fuel injection control unit A control device for an automatic transmission, wherein the engine torque is reduced by suppressing or cutting a fuel injection amount . The torque reduction means reduces the shift shock when there is a torque reduction request and the throttle opening is high and the change in the transmission gear ratio is large even when the on-vehicle equipment is operated. It is determined that the necessary amount of torque reduction is large, exhaust recirculation is performed to recirculate engine exhaust to the intake side during a shift by the automatic transmission, engine torque is reduced, and fuel injection control unit 3. The control device for an automatic transmission according to claim 2, wherein the engine torque is reduced by suppressing or cutting the injection amount .

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