JPH0625589B2 - Automatic shift control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic shift control device for a vehicle, which is capable of performing a shift operation mainly by operating an accelerator pedal, and particularly to an automatic shift control device suitable for a diesel vehicle. Regarding

[Conventional technology]

In a vehicle that uses an internal combustion engine such as a diesel engine or a gasoline engine as a prime mover for propulsion, the propulsion drive system requires a power transmission interruption function and a gear ratio conversion function from the rotation speed / torque characteristics of the prime mover. For this reason, the driving operation is complicated, and it requires physical strength of a certain level or more, and there is no problem in safety.

Therefore, so-called automatic vehicles (AT vehicles) have been widely put into practical use, in which the shift operation is automated and the vehicle can be driven mainly by operating the accelerator pedal and the brake pedal. Can be found in the disclosure of JP-A-59-97351.
In this conventional technique, the gear ratio in the traveling drive system is controlled according to the vehicle speed and the operation amount of the accelerator pedal.

[Problems to be solved by the invention]

By the way, in the prior art, as described above, the control proceeds according to the vehicle speed and the accelerator pedal operation amount, so that the accelerator pedal operation amount must be accurate in order to obtain good automatic gear shifting characteristics. Therefore, the problem is how to accurately detect the accelerator pedal depression amount, so that the sensor that detects the accelerator pedal depression amount, the so-called accelerator sensor itself with high accuracy, It is necessary to maintain the quality variation and the mounting accuracy, and also to cope with the secular change in the characteristics.However, the above-mentioned conventional technology does not take these points into consideration, and the accuracy of the accelerator sensor decreases. There were problems in terms of performance degradation and simplification of sensor mounting work.

It is an object of the present invention to automatically detect the accelerator pedal depression amount with high accuracy regardless of changes in the detection characteristics of the accelerator sensor, and to automatically maintain a constant running performance. It is to provide a control device.

[Means for Solving Problems] The purpose is to set a situation in which the operation amount of the accelerator pedal can be detected independently of the detection result of the accelerator sensor,
The detection result of the accelerator pedal at that time is corrected by the operation amount of the accelerator pedal at the time when this situation is established, so that the detection characteristic of the accelerator pedal operation amount by the accelerator sensor is sequentially learned. And is calibrated and achieved.

[Action]

Even if there is an error in the detection of the amount of depression of the accelerator pedal by the accelerator sensor, or if there is a change in the detection characteristics, each time the above-mentioned predetermined situation is established, correction is performed and learned. Therefore, the detection of the accelerator pedal depression amount can always be maintained with high accuracy.

〔Example〕

Hereinafter, the automatic shift control device according to the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is an embodiment of the present invention, which is an embodiment in which the present invention is applied to an automatic transmission of a diesel vehicle. In FIG. 1, 1 is an engine, 2 is a transmission, 3 is a clutch, and 4 is a clutch.
Is a clutch actuator, 5 is a select actuator, 6 is a shift actuator, 7 is a fuel injection pump, 8 is an accelerator pedal, 9 is a control circuit, 10 is a select handle, 11 is an engine speed sensor, 12 is a vehicle speed sensor,
Reference numeral 13 is an exhaust brake valve, and 14 is an accelerator sensor.

Normally, the engine 1 is controlled in rotation speed by the fuel injection pump 7 being controlled by the accelerator work by the driver via the accelerator pedal 8, but the fuel is further controlled by the control signal f from the control circuit 9. The rotation speed is also controlled by controlling the injection pump 7.

As shown schematically in FIG. 2, the transmission 2 includes a gear pair 21 having an inherent gear ratio between an input shaft 28 and an output shaft 29 connected to the clutch 3.
50 to 53 that are selectively operated by the shift actuator 5 and the select actuator 6
The corresponding dog clutches 31-34 are operated via the gears to constitute a constant mesh type gear transmission, and the select signal s ₁ supplied from the control circuit 9 and the shift signal are supplied to the select actuator 5 and the shift actuator 6. It is controlled by the signal s ₂ and performs an automatic shifting operation. A sub shaft 30 is constantly rotated by an input shaft 28 via a gear pair 25. The engine speed sensor 11 is attached to the gear pair 21 and a gear 35 attached to the output shaft 29.
A vehicle speed sensor 12 is associated with the vehicle.

The control circuit 9 uses the acceleration signal a from the accelerator sensor 14 attached to the accelerator pedal 8 and the operating states of the respective devices from the clutch actuator 4, the select actuator 5, the shift actuator 6, and the fuel injection pump 7. Feedback signals c, p ₁ , p ₂ , b, and the engine speed sensor 1
1, the signals n and v from the vehicle speed sensor 12, the select signal s ₀ from the select handle 10 and the like are taken in, and various control signals as the calculation processing results thereof are generated to generate the fuel injection pump 7 and the exhaust brake. Valve 13
Control signals f and e to control the engine speed, and control signals d, s ₁ and s ₂ to the clutch actuator 4, the select actuator 5 and the shift actuator 6, respectively, to automatically select a predetermined gear ratio. Carry out.

Next, the automatic shift control operation in this embodiment will be described.

The selection of the gear ratio of the transmission 2 is mainly determined by the vehicle speed and the operation amount of the accelerator pedal, and the state thereof is the third.
It looks like the shift schedule shown.

In FIG. 3, the solid line shows the characteristics at the time of shift-up, and the broken line shows the characteristics at the time of shift-down, and the regions I to V represent the gear ratios. Then, the gear ratio is selected from this characteristic.

Now, assume that the gear ratio is in the region II, and at this time, the current vehicle speed V (Km / h) obtained from the signals v and a and the accelerator pedal depression amount α (%) are at point A in FIG. , If the accelerator pedal 8 is further depressed from here to accelerate,
It can be seen that the speed change is performed when the speed V gradually increases and reaches the point B.

Further, even if the vehicle speed V is constant, if the accelerator pedal depression operation amount α changes, it is understood that the downshift is performed as shown by the movement from point C to point B in the figure.

As described above, in the automatic shift control device, the important factor for controlling the transmission is the accelerator pedal depression amount α, and therefore the detection accuracy of the accelerator sensor 14 becomes a problem.

FIG. 4 shows an embodiment of the accelerator sensor 14, in which the operation amount of the accelerator pedal 8 is detected by a linear variable resistor. Reference numeral 40 is a kick down switch.

Therefore, in such an accelerator sensor, not only the accuracy of the sensor itself is improved but also the mounting state in combination with the accelerator pedal 8 becomes a problem.

Here, first, the stroke of the accelerator pedal 8 is kept substantially constant due to its mechanism.
If the accelerator sensor 14 is combined as shown in the figure and the output voltage of the accelerator sensor 14 when the depression amount of the accelerator pedal 8 is 0% is V _o and that at 100% is V _F , the accelerator pedal 8 detection signal a of the change width of the output voltage at full stroke width W of the depressing amount V _F -V _o, and the this depressing amount of the accelerator pedal 8 with α and the accelerator sensor 14
Therefore, it should be possible to accurately detect the accelerator pedal depression amount α by these voltages and obtain correct shift control. That is, for accurate control, it is necessary that the matching between the stroke position of the accelerator pedal 8 and the detection signal from the accelerator sensor 14 is always kept accurate, and at this time, a particular problem is that The detection signal of the accelerator sensor 14 corresponds to the zero stroke position and the full stroke position of the accelerator pedal 8, and this changes depending on the mutual mounting position relationship.

Therefore, in the prior art, it has been necessary to accurately mount and adjust the accelerator sensor 14 and sufficiently maintain its accuracy.

On the other hand, in this embodiment, the control circuit 9 is provided with a memory for storing the conversion relationship between the detection signal a of the accelerator sensor 14 and the depression operation amount α of the accelerator pedal 8. Detection signal a from the sensor 14
Is converted into an accelerator pedal depression operation amount α to be read, and the conversion relationship stored in this memory is learned by the first and second determining means and is sequentially rewritten. I am doing it.

Therefore, the learning operation will be described below. That is, first, the first determination means detects that the stroke of the accelerator pedal 8 is zero because the predetermined condition is satisfied, regardless of the detection signal of the accelerator sensor 14, and is obtained at that time. The output voltage value of the accelerator sensor 14 is set to V _o, and a new conversion relationship in which the accelerator pedal depression amount α corresponding to the output voltage value is set to 0% is stored in the memory instead of the previous conversion relationship. .

Further, the second determination means determines that the accelerator pedal 8 is in the full stroke, which is also the accelerator sensor 14
Regardless of the detection signal of, the accelerator sensor 1 which is detected when a predetermined condition is satisfied and is obtained at that time
The output voltage value of 4 is set to V _F, and a new conversion relationship in which the corresponding depression operation amount α of the accelerator pedal becomes 100% is stored in the memory instead of the previous conversion relationship. is there. It should be noted that these first and second determination means are both configured as one of the functions of the microcomputer included in the control circuit 9.

Therefore, this rewriting of the memory is repeated each time the above-mentioned predetermined condition is satisfied, and the detection signal a of the accelerator sensor 14 is always used to change the accelerator pedal based on the conversion relationship based on the latest learning result. Conversion to the depression operation amount α is obtained, and according to this embodiment, after all,
Despite the mounting accuracy of the accelerator sensor 14 and the relative mounting position relative to the accelerator pedal 8 due to changes over time, etc., an accurate detection of the accelerator pedal depression amount can always be obtained and sufficient running performance can be maintained. You can

Next, the establishment of the above-mentioned predetermined condition will be described.

Originally, the accelerator sensor 14 is provided to detect the stroke position of the accelerator pedal 8. Therefore, if the depression amount of the accelerator pedal can be detected independently of the accelerator sensor 14, this accelerator sensor 14 can be detected. 14 should not be needed. That is, the fact that the accelerator sensor 14 is used means that there is no other detection means.

However, according to the present invention, even if the position detection over the entire range of the accelerator pedal depression amount is impossible, it is sufficient for correction by learning if the zero position and the full stroke position can be determined from the detection characteristics of the accelerator sensor. Therefore, in this embodiment, the following conditions are adopted as the above-mentioned predetermined conditions.

First, the on-state of the kick-down switch 40 shown in FIG. 4 is adopted as a condition that the depression amount of the accelerator pedal 8 is at the full stroke position.

Next, as a condition that the depression amount of the accelerator pedal 8 is at the zero position, the vehicle speed signal v is used in this embodiment, whereby the rate of change −ΔV in the decreasing direction of the vehicle speed is a predetermined value Vc.
It is configured to use the above. That is, | −ΔV | ≧ Vc is a condition.

Here, the predetermined value Vc may be set so as to be a deceleration change rate that appears only when all accelerator pedals 8 are released, in consideration of a deceleration state that may occur even when the vehicle enters a slope. .

This presupposes that in actual driving conditions a large deceleration will only be obtained when the accelerator pedal is released. For this reason, it is possible to detect the depression of the brake pedal, but this is not preferable because it is not possible to deal with the heel and toe operation and there is a risk of erroneous learning.

Therefore, according to this embodiment, sufficiently reliable learning can be obtained, the accurate accelerator pedal depression amount can always be detected, and correct driving performance can be stably maintained.

Next, a predetermined condition for detecting the zero stroke position of the accelerator pedal depression amount in another embodiment of the present invention will be described.

In this embodiment, when the transmission 2 is detected to be in the neutral position by the position signals p ₁ and p ₂ from the select actuator 5 and the shift actuator 6, the signal n from the engine speed sensor 11 is used. When the detected reduction rate −ΔN of the engine speed N exceeds a predetermined value Nc, that is, | −ΔN | ≧ Nc This is because the deceleration of the engine returns to the zero opening of the accelerator pedal when there is no load. It is premised that the value will be equal to or less than the predetermined value when it is performed.

Therefore, according to this embodiment as well, the learning of the accelerator pedal depression amount can be surely obtained, and stable running performance can always be maintained.

By the way, although the above-mentioned embodiments describe the case where the present invention is applied to the diesel engine, the present invention is particularly effective when applied to the diesel engine as described above. That is, the diesel engine has a relatively narrow rotation speed range in a practical torque state. Therefore, it is particularly necessary to accurately perform a gear shifting operation for an automobile, and as a result, the accelerator pedal This is because it is necessary to detect the stepping operation amount sufficiently accurately, and the characteristics of the present invention can be fully utilized. Then,
It is needless to say that the present invention is not limited to this embodiment and can be applied to a vehicle using any internal combustion engine such as a gasoline engine.

〔The invention's effect〕

According to the present invention, the relationship between the depression operation amount of the accelerator pedal and the detection signal of the accelerator sensor is constantly learned, so that highly accurate detection is stably maintained, and the accelerator sensor is attached and the accuracy is maintained thereafter. It is possible to easily and easily provide an automatic shift control device having stable and stable driving performance at low cost, reliably and easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an automatic shift control device according to the present invention, FIG. 2 is a diagram showing an embodiment of a transmission, FIG. 3 is an explanatory view of a shift schedule, and FIG. 4 is an accelerator. It is explanatory drawing of the attachment state of a sensor. 1 ... Engine, 2 ... Transmission, 3 ... Clutch, 4 ...
... clutch actuator, 5 ... select actuator, 6 ... shift actuator, 7 ... fuel injection pump, 8 ... accelerator pedal, 9 ... control circuit, 10 ...
… Select handle, 11 …… Engine speed sensor,
12 ... Vehicle speed sensor, 13 ... Exhaust brake valve, 14 ... Accelerator sensor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaji Shibata 2520, Takaba, Katsuta City, Ibaraki Prefecture, Hitachi, Ltd. Sawa Plant, Hitachi, Ltd. (56) Reference JP-A-59-97351 (JP, A) JP 54-120365 (JP, A)

Claims (6)

[Claims] 1. An arithmetic means for converting a detection signal of a sensor means interlocked with an accelerator pedal into output data representing a depression operation amount of the accelerator pedal in accordance with a preset predetermined conversion relation, and the arithmetic means. In the vehicular automatic shift control device of the system for controlling the gear ratio of the drive system by the vehicle propulsion motor on the basis of the output data of the above, the sensor means that the operation amount of the accelerator pedal is at the lower limit position of its movable range. And a second determination means for detecting that the depression amount of the accelerator pedal is at the upper limit position of its movable range regardless of the detection signal of the sensor means. Means for correcting the lower limit position of the depression operation amount of the accelerator pedal according to the predetermined conversion relationship according to the detection result of the first determination means. We, the automatic transmission control device being characterized in that configured to in accordance with the detection result by the second determination means to correct the upper limit position of the depressing amount of the accelerator pedal by the predetermined conversion relation is performed. 2. The first aspect of the present invention as set forth in claim 1
The determination means is configured to detect the deceleration of the vehicle and determine that the lower limit position of the accelerator pedal depression amount is detected on the condition that it exceeds a predetermined value. A characteristic automatic gear shift control device. 3. The first aspect of the invention as set forth in claim 1
The determining means of the accelerator is a condition in which the power transmission from the vehicle propulsion prime mover to the drive mechanism of the vehicle is shut off, and the speed of the vehicle propulsion prime mover falls below a predetermined value. An automatic shift control device, characterized in that it is configured to determine that a lower limit position of the pedal operation amount has been detected. 4. The second aspect of the present invention as set forth in claim 1
The automatic shift control device is characterized in that the determining means is constituted by a switch means that is activated when the accelerator pedal is depressed to an upper limit position of its movable range. 5. The automatic shift control device according to claim 4, wherein the switch means is a kickdown switch of an automobile. 6. The automatic shift control device according to claim 1, wherein the vehicle propulsion prime mover is an internal combustion engine having a relatively narrow rotational speed variable control range.