JP4246601B2 - Control device for automatic transmission of vehicle - Google Patents

Description

  The present invention generally relates to a control device for an automatic transmission for a vehicle, and more particularly, to a control device for an automatic transmission for a vehicle that optimizes uphill / downhill shift control in accordance with the operating state of all cylinders and idle cylinders.

  The automatic transmission for a vehicle includes a plurality of ranges (positions) such as P, R, N, D4, D3, 2, 1, and the like, and in the D4 range which is an automatic transmission range, a shift characteristic (shift map) stored in advance. Accordingly, the shift is automatically performed based on the vehicle speed indicating the running state and the throttle opening indicating the engine load.

  The driver usually travels with the shift lever set in the D4 range. In the D4 range, a shift is performed regardless of the driver's intention based on a shift pattern (shift pattern) stored in advance as a shift map (shift map).

  Generally, this shift map is prepared as follows. That is, data is accumulated based on a test or the like as to how much acceleration there is when traveling on flat roads and uphill / downhill roads with a certain vehicle speed and a certain accelerator opening. Here, acceleration on a flat road is referred to as reference acceleration.

  Next, the actual acceleration at the current traveling vehicle speed and accelerator opening is calculated from the change in vehicle speed per hour. The calculated actual acceleration is compared with the acceleration stored in the data to determine the uphill / downhill state.

  That is, when the calculated value is larger than the reference acceleration, it is determined that the vehicle is descending, and when the calculated value is small, it is determined that the vehicle is climbing, and the shift map is optimally set as a light, medium or heavy climb or descend depending on the magnitude. Then, based on this shift map, shift control of the uphill / downhill road is executed.

On the other hand, an engine that can execute and stop combustion for each cylinder group mainly for the purpose of improving fuel efficiency is known. In such an engine, not only the difference in output characteristics due to the difference in the number of cylinders, but also machining errors and assembly errors in the all cylinder operation state (all cylinder operation state) and the partially cylinder operation state (cylinder operation state). There is a difference in output characteristics for each cylinder group due to a slight difference for each cylinder group.
Japanese Patent Laid-Open No. 10-141485 Japanese Patent No. 3109380

  In this way, when going up and down slope control with an engine capable of executing / pausing for each cylinder group, the output torque differs between all-cylinder operation and rest-cylinder operation even if the accelerator opening is the same, so the reference acceleration itself Will be different.

  Therefore, as in the past, three types of shift maps are prepared: light, medium, and heavy, depending on the grade of the slope, and the slope is light, medium, and heavy, depending on the grade of the slope. It is not enough to prepare the three types of shift maps.

  Accordingly, an object of the present invention is to provide a control device for an automatic transmission capable of optimizing uphill / downhill shift control of a vehicle equipped with an engine that can be switched between an all-cylinder operation state and a non-cylinder operation state. It is to be.

According to the first aspect of the present invention, the throttle control device that is controlled based on the accelerator opening, the all-cylinder operation state in which all the cylinders of the engine are operated according to the operation state of the vehicle, and the operation of some cylinders. A control device for an automatic transmission of a vehicle including an engine that can be controlled to switch to a non-cylinder operation state, wherein the climbing state of the vehicle at any of a plurality of stages set in advance based on a predetermined criterion An uphill state determining means for determining whether the speed corresponds to the above-mentioned stage, and a shift pattern for selecting one shift pattern from a plurality of predetermined shift patterns according to the level of the uphill state determined by the uphill state determining means When the idle cylinder operation state is detected by the selection means, the idle cylinder operation state detection means for detecting the idle cylinder operation state of the engine, and when the idle cylinder operation state is detected by the idle cylinder operation state detection means, Criteria changing means for changing the predetermined criterion so as to determine the climbing state as the step of the higher climbing slope with respect to the climbing state determined in the driving state, and the shift pattern selection There is provided a control device for an automatic transmission of a vehicle, comprising: an uphill shift control unit that performs shift control based on a shift pattern selected by the unit.

According to the second aspect of the present invention, the throttle control device controlled based on the accelerator opening, the all-cylinder operation state in which all the cylinders of the engine are operated according to the operation state of the vehicle, and a part of the cylinders are operated. A control device for an automatic transmission of a vehicle comprising an engine that can be switched to a non-cylinder operation state, wherein the downhill state of the vehicle is determined in a plurality of predetermined stages based on a predetermined determination criterion. According to the downhill state determination means for determining which stage corresponds to, and the downhill state stage determined by the downhill state determination means, one shift pattern is selected from a plurality of predetermined shift patterns. A shift pattern selecting means for selecting, a cylinder idle state detecting means for detecting a cylinder idle state of the engine, and a cylinder idle state being detected by the cylinder idle state detecting means; A criterion changing means for changing the predetermined criterion so as to determine the downhill state as a step on the side where the slope of the downhill is larger than the step of the downhill state determined in the driving state; There is provided a control device for an automatic transmission of a vehicle, comprising: a downhill shift control unit that performs shift control based on the shift pattern selected by the shift pattern selection unit.

According to the first aspect of the present invention, when the cylinder resting state is detected, the step of the climbing slope is larger than the step of the climbing state determined when the engine is in the all-cylinder operation state. A predetermined criterion is changed so as to determine the climbing state. Therefore, it is possible to achieve optimal climbing speed change control in both the all-cylinder operation state and the non-cylinder operation state, and to ensure good drivability.

According to the second aspect of the present invention, when the idle cylinder operation state is detected, the descending slope is larger than the downhill state determined when the engine is in the all cylinder operation state. As a step, a predetermined criterion is changed so as to determine the downhill state. Therefore, optimal downhill shift control can be achieved in both the all-cylinder operation state and the non-cylinder operation state, and good drivability can be ensured.

  Referring to FIG. 1, there is shown a first principle block diagram of a control device for an automatic transmission according to the present invention. A vehicle to which the control device of the present invention is applied includes a throttle control device that is controlled based on the accelerator opening, an all-cylinder operation state in which all cylinders of the engine are operated according to the operation state of the vehicle, and some cylinders It is equipped with an engine that can be switched to a cylinder-cylinder operation state in which the engine is operated.

  The climbing state detection means 2 detects the climbing state of the vehicle. The shift pattern selecting means 4 selects one shift pattern from a plurality of shift patterns determined in advance according to the degree of climbing when the climbing condition is detected by the climbing condition detecting means 2.

  The idle cylinder operating state detection means 6 detects the idle cylinder operating state of the engine. The shift pattern changing means 8 sets the shift-up line to the higher vehicle speed side with respect to the shift pattern selected when the idle cylinder operation state is detected by the idle cylinder operation state detection means 6 in the all cylinder operation state of the engine. Change to

  The uphill shift control means 10 executes the uphill shift control based on the shift pattern selected by the shift pattern selection means 4 or the shift pattern changed by the shift pattern change means 8. For example, the shift pattern changing means 8 is composed of a plurality of shift patterns for cylinder rest operation that are predetermined according to the degree of climbing.

  Referring to FIG. 2, there is shown a second principle block diagram of an automatic transmission control apparatus according to the present invention. Downhill state detection means 12 detects the downhill state of the vehicle. When the downhill state is detected by the downhill state detecting unit 12, the shift pattern selecting unit 4 'selects one shift pattern from a plurality of predetermined shift patterns according to the degree of downhill.

  The idle cylinder operating state detection means 6 detects the idle cylinder operating state of the engine. The shift pattern changing means 8 'sets the shift down line to a high vehicle speed with respect to the shift pattern selected when the idle cylinder operating state is detected by the idle cylinder operating state detecting means 6 in the all cylinder operating state of the engine. Change to the side.

  The downhill shift control means 14 executes downhill shift control based on the shift pattern selected by the shift pattern selection means 4 'or the shift pattern changed by the shift pattern change means 8'. For example, the shift pattern changing means 8 'is composed of a plurality of shift patterns for cylinder rest operation that are determined in advance according to the degree of downhill.

  Referring to FIG. 3, there is shown a third principle block diagram of the automatic transmission control apparatus according to the present invention. The climbing state determination means 16 determines which step in a plurality of predetermined steps the climbing state of the vehicle is based on a predetermined determination criterion.

  The shift pattern selection unit 18 selects one shift pattern from a plurality of predetermined shift patterns according to the level of the climbing state determined by the climbing state determination unit 16. The idle cylinder operating state detection means 6 detects the idle cylinder operating state of the engine.

  When the idle cylinder operating state is detected by the idle cylinder operating state detecting means 6, the determination reference changing means 20 has a higher slope than the uphill state determined when the engine is in the all cylinder operating state. The predetermined determination criterion is changed so as to determine the climbing state as the step of the larger side. The uphill shift control means 10 ′ executes the uphill shift control based on the shift pattern selected by the shift pattern selection means 18.

  As the determination criterion, for example, a reference acceleration when traveling on a flat road at a predetermined vehicle speed and a predetermined accelerator opening can be employed. As an alternative, a road gradient may be detected using a gradient sensor, and a predetermined determination criterion may be set by dividing the climbing state into a plurality of stages in advance for the detected value of the gradient.

  The judgment criteria in this case are, for example, light climbing: slope detection value = A degree to B degree, middle climbing: slope detection value = C degree to D degree, heavy climbing: slope detection value = E degree to F degree (A < B <C <D <E <F).

  When the cylinder is closed, the predetermined reference value is changed as follows. That is, light uphill: gradient detected value = a degree to b degree, middle uphill: gradient detected value = c degree to d degree, heavy uphill: gradient detected value = e degree to f degree (a <b <c <d <e <F and a <A, b <B, c <C, d <D, e <E, f <F).

  Referring to FIG. 4, there is shown a fourth principle block diagram of an automatic transmission control apparatus according to the present invention. The downhill state determination means 22 determines which step in a plurality of predetermined steps the downhill state of the vehicle is based on a predetermined determination criterion.

  The shift pattern selection unit 24 selects one shift pattern from a plurality of predetermined shift patterns according to the downhill state determined by the downhill state determination unit 22. The idle cylinder operating state detection means 6 detects the idle cylinder operating state of the engine.

  When the idle cylinder operating state is detected by the idle cylinder operating state detecting means 6, the determination reference changing means 26 is further downhill with respect to the downhill state determined when the engine is in the all cylinder operating state. The predetermined determination criterion is changed so that the downhill state is determined as a stage on the side where the slope of the slope is larger. The downhill shift control unit 14 ′ executes the downhill shift control based on the shift pattern selected by the shift pattern selection unit 24.

  As the predetermined determination criterion, it is possible to adopt a reference acceleration when traveling on a flat road with a predetermined vehicle speed and a predetermined accelerator opening. As an alternative, a road gradient may be detected using a gradient sensor, and a predetermined determination criterion may be set by dividing the downhill state into a plurality of stages in advance for the detected value of the gradient.

  Predetermined criteria for all-cylinder operation are, for example, light descent: slope detection value = A degree to B degree, middle descent slope: slope detection value = C degree to D degree, heavy descent: slope detection value = E. Degrees to F degrees (A <B <C <D <E <F).

  During idle cylinder operation, the predetermined judgment criteria are as follows: light downhill: gradient detected value = a degree to b degree, middle downhill: gradient detected value = c degree to d degree, heavy downhill: gradient detected value = e degree. -F degrees (a <b <c <d <e <f and a <A, b <B, c <C, d <D, e <E, f <F).

  Next, a control device for a vehicle automatic transmission according to an embodiment of the present invention will be described with reference to the block diagram of FIG. An automatic transmission 32 is connected to the crankshaft of the engine 30. The engine 30 of the present embodiment is an engine that can execute and pause combustion for each cylinder group.

  That is, the engine is configured to perform combustion stop control or control of the combustion state based on the ignition timing and the fuel injection amount with a predetermined number of cylinders as a group. One example is a V-type 6-cylinder engine that performs the above control for each cylinder in the left and right banks.

  Referring to FIG. 6, the operating state of the engine 30 according to the vehicle speed and the accelerator opening is shown. When the accelerator pedal opening is larger than the accelerator pedal opening shown by the lines 33a to 33d, all cylinders are operated, and the operation is small. At the accelerator pedal opening, the cylinder is partially rested.

  Such an engine does not perform one-bank operation (partially closed cylinder operation) in order to reduce the output torque, but each bank has a separate intake / exhaust system, so that mechanical such as friction can be achieved. One-bank operation is performed in order to reduce loss and improve fuel efficiency.

  The throttle opening during one bank operation is expanded by the throttle control device to about twice that during double bank operation (all cylinder operation). Therefore, the output torque of the engine is basically not changed by changing the bank that performs combustion, but smoothly changes according to the accelerator opening that is an output request.

  Referring again to FIG. 5, the automatic transmission 32 has a well-known configuration and includes a torque converter connected to the crankshaft of the engine 30 and a multi-stage transmission gear mechanism connected to the output side of the torque converter. The engine 30 and the automatic transmission 32 are controlled by an electronic control unit (ECU) 34 mounted on the vehicle.

  The engine 30 is provided with a throttle valve opening detecting means 36 for detecting the opening of a throttle valve provided in the middle of the intake pipe, and the detection signal is input to the ECU 34. Similarly, a PA detection means 40 for detecting atmospheric pressure and a TW detection means 42 for detecting the engine water temperature are provided in the vicinity of the engine 30, and the detection signal is input to the ECU 34.

  Further, in the vicinity of the accelerator pedal, an accelerator pedal opening degree detecting means 38 for detecting the amount of depression of the accelerator pedal (AP opening degree) is provided, and the detection signal is input to the ECU 34.

  Brake (BRK) detection means 44 is provided in the vicinity of the brake pedal, and its detection signal is input to the ECU 34. Further, vehicle speed detection means 46 for detecting the vehicle speed is provided on the output side of the automatic transmission 32, and the detection signal is input to the ECU 34.

  The ECU 34 includes a central processing unit (CPU), storage elements such as a ROM and a RAM, and an input / output interface, and achieves a large number of processes by programmed software.

  The acceleration / deceleration detection means 48 detects the actual acceleration or deceleration from the change in the vehicle speed per time. The gear position detecting means 50 detects the gear position of the automatic transmission 32. For example, when the shift lever is in the drive range (D range), the gear position detection means 50 detects one of the first to fifth speeds.

  The cylinder deactivation control means 52 performs control so that all cylinder operation is performed when the accelerator pedal opening is larger than the accelerator pedal opening indicated by lines 33a to 03d in FIG. 6, and partial cylinder deactivation is performed when the accelerator pedal opening is small. To do. The all-cylinder / non-cylinder detection means 54 detects whether the engine 30 is in an all-cylinder operation state or a partial cylinder-off operation state.

  Detection signals from the acceleration / deceleration detecting means 48, the gear position detecting means 50, and the all cylinder / non-cylinder detecting means 54 are input to a gradient determination value detecting means 56 for determining the gradient of the uphill / downhill road. The gradient determination value detection means 56 also receives the throttle opening, accelerator pedal opening, atmospheric pressure PA, engine water temperature TW, brake signal, and vehicle speed. Based on these detection signals, the gradient determination value detection means 56 determines the gradient of the uphill / downhill road in three stages: light, medium and heavy.

  The all-cylinder / non-cylinder climbing / descending slope determination means 58 is based on the gradient judgment value from the gradient judgment value detection means 56 and the detection signal from the all-cylinder / non-cylinder detection means 54, and how much of the slope is climbing / lowering in all cylinder operation. It is determined whether the slope is uphill or downhill with a closed cylinder operation.

  The shift map detecting means 60 detects one optimum shift map based on the vehicle speed, the accelerator pedal opening, and the output of the all cylinder / non-cylinder climbing / descending slope determining means 58. In response to the output of the all-cylinder / cylinder uphill / downhill determination means 58, control is performed so as to switch to the uphill map faster during the idle cylinder operation and to switch to the downhill map faster than during all cylinder operation.

  In other words, at the time of climbing in the closed cylinder operation, the shift map in which the shift-up line is changed to the high vehicle speed side is selected with respect to the shift map selected in the all cylinder operation state. Further, when the downhill is in the closed cylinder operation, the shift map in which the downshift line is changed to the high vehicle speed side is selected with respect to the shift map selected in the all cylinder operation state.

  The shift control unit 62 controls the automatic transmission 32 based on the shift map detected by the shift map detection unit 60.

  Referring to FIG. 7, a shift map image at the time of climbing a closed cylinder is schematically shown. Reference numeral 64 denotes a 3-4 speed upshift line at the time of all cylinder operation, and this shift up line is changed to the high vehicle speed side as indicated by a line 66 at the time of cylinder resting operation.

  Line 68 is the throttle opening during cruising running on an uphill with an uphill gradient of 3% at the fourth speed, and 70 indicates the throttle opening during cruise running on an uphill with an uphill slope of 3% at the third speed.

  According to the present invention, if the vehicle is going to run at the vehicle speed V1 at the fourth speed, the entire cylinder region is entered as indicated by the point P, and the idle cylinder cannot be continued, so the 3-4 speed shift up line 66 is changed to the higher vehicle speed side. Thus, it is possible to improve fuel efficiency by traveling at the third speed and allowing the cylinder to be stopped.

  Referring to FIG. 8, there is schematically shown a shift map image at the time of downhill descending. Reference numeral 72 denotes a 4-3 speed downshift line during all cylinder operation, and 76 denotes a 5-4 speed downshift line during all cylinder operation.

  According to the present invention, at the time of cylinder resting operation, as indicated by 74 and 78, the 4-3 speed downshift line and the 5-4 speed downshift line are respectively changed to the high vehicle speed side. Thereby, the effect of engine braking can be strengthened and downhill control can be optimized.

  FIG. 9 shows the relationship between vehicle speed and fuel cut during all-cylinder operation, and FIG. 10 shows the relationship between vehicle speed and fuel cut according to the present invention during cylinder rest operation. As shown in FIG. 9, when all cylinders are operated, if the fuel cut is established at the fifth speed and the vehicle is decelerated, the engine speed Ne decreases from the fuel cut return Ne at the fifth speed steady state, and the fuel cut return. Resulting in. Even after the 5th to 4th gear shift down, the fuel cut condition is not satisfied and the fuel cut cannot be continued.

  On the other hand, during cylinder resting operation, as shown in FIG. 10, when the fuel cut is established at the 5th speed and the vehicle is decelerating, in order to obtain a feeling of deceleration equivalent to that for all cylinders, it is higher than that for all cylinders. A 5-4 speed downshift line is set on the vehicle speed side.

  Therefore, since the engine speed Ne does not fall below the fuel cut return Ne, the 5-4 speed shift down is performed while the fuel cut is established, and the fuel cut can be continued. By changing the 4-3 speed downshift line to the higher vehicle speed side, the fuel cut time can be extended and the fuel consumption can be improved.

  In the above-described embodiment, the uphill / downhill control is performed based on the shift map in which the shift-up line and the shift-down line are changed to the high vehicle speed side in comparison with the shift map at the time of all cylinder operation at the time of idle operation. The shift map may not be changed between all cylinders and when the cylinders are closed, but the reference value for gradient determination at the time of cylinders may be changed. This method is described in detail with reference to the block diagrams of FIGS.

It is a first principle block diagram of the present invention. It is a 2nd principle block diagram of this invention. It is a 3rd principle block diagram of this invention. It is a 4th principle block diagram of this invention. 1 is a block diagram of a control device for an automatic transmission according to an embodiment of the present invention. FIG. It is a figure which shows the all-cylinder / non-cylinder operation state of an engine according to a vehicle speed and an accelerator pedal opening degree. It is a figure which shows roughly the shift map image at the time of a closed cylinder climbing. It is a figure which shows roughly the shift map image at the time of a closed cylinder downhill. It is a figure which shows the relationship between the vehicle speed at the time of all cylinder driving | operation, and a fuel cut. It is a figure which shows the relationship between the vehicle speed at the time of idle cylinder driving | operation, and a fuel cut.

Explanation of symbols

2 Climbing state detecting means 4, 4 'Shifting pattern selecting means 6 Cylinderless operation state detecting means 8, 8' Shifting pattern changing means 10, 10 'Uphill shifting control means 12 Downhill state detecting means 14, 14' Downhill shifting control Means 16 Uphill state judgment means 18, 24 Shift pattern selection means 20, 26 Judgment reference change means 22 Downhill state judgment means 64 3-4 speed shift up line 66 for all cylinders 3-4 speed shift up line 72 for all cylinders 4-3 speed shift down line 74 when cylinder is closed 4-3 speed shift down line when cylinder is closed 5-4 speed shift down line 78 when cylinder is closed 5-4 speed shift down line when cylinder is closed

Claims (2)

A throttle control device that is controlled based on the accelerator opening, and can be switched between an all-cylinder operation state in which all cylinders of the engine are operated and a non-cylinder operation state in which some cylinders are operated according to the operation state of the vehicle. A control device for an automatic transmission of a vehicle equipped with an engine,
Climbing state determination means for determining which step in a plurality of preset stages the climbing state of the vehicle is based on a predetermined determination criterion;
Shift pattern selecting means for selecting one shift pattern from a plurality of predetermined shift patterns in accordance with the level of the climb state determined by the climb state determining means;
A non-cylinder operation state detecting means for detecting a cylinder-cylinder operation state of the engine;
When the idle cylinder operation state is detected by the idle cylinder operation state detecting means, the step on the side where the gradient of the uphill is larger than the uphill state determined when the engine is in the all cylinder operation state. A criterion changing means for changing the predetermined criterion so as to determine an uphill state;
An uphill shift control means for performing a shift control based on the shift pattern selected by the shift pattern selection means;
A control device for an automatic transmission of a vehicle. A throttle control device that is controlled based on the accelerator opening, and can be switched between an all-cylinder operation state in which all cylinders of the engine are operated and a non-cylinder operation state in which some cylinders are operated according to the vehicle operation state. A control device for an automatic transmission of a vehicle equipped with an engine,
Downhill state determination means for determining which of a plurality of predetermined stages the downhill state of the vehicle is based on a predetermined determination criterion;
Shift pattern selecting means for selecting one shift pattern from a plurality of predetermined shift patterns according to the step of the downhill state determined by the downhill state determining means;
A non-cylinder operation state detecting means for detecting a cylinder-cylinder operation state of the engine;
When the idle cylinder operation state is detected by the idle cylinder operation state detection means, the descending slope is larger than the downhill state determined when the engine is in the all cylinder operation state. A criterion changing means for changing the predetermined criterion so as to determine a downhill state as a stage;
Downhill shift control means for performing shift control based on the shift pattern selected by the shift pattern selection means;
A control device for an automatic transmission of a vehicle.

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