JP6128433B2 - Automatic transmission control device - Google Patents

Description

  The present invention relates to a technical field of an automatic transmission control device that sets a start stage of an automatic transmission when a vehicle equipped with the automatic transmission is in a stopped state.

  In a vehicle equipped with an automatic transmission that automatically controls the shift speed, the shift speed is basically selected so that the load on the clutch does not become excessive. In particular, when starting the vehicle, the gear position is selected so that the load on the clutch does not become excessive when the vehicle in a stopped state is started. Since the magnitude of the load applied to the clutch at the start is greatly affected by the vehicle weight, the selection of the gear position at the start is performed in consideration of the vehicle weight.

  In a vehicle that loads and conveys heavy objects, the vehicle weight may vary greatly depending on the weight of the loaded object. Therefore, some vehicles of this type calculate the vehicle weight based on the behavior of the vehicle during traveling, and determine the gear position at the start based on the calculation result. Various methods for calculating the vehicle weight have been proposed. For example, there are Patent Documents 1 and 2. In Patent Documents 1 and 2, the vehicle weight is calculated based on the acceleration of the vehicle during traveling.

  Patent Document 3 discloses a technique for stabilizing the vehicle start based on the gradient of the stopped traveling path in order to reduce clutch slip at the time of start.

JP 2001-304948 A JP 2007-78619 A JP 2007-127155 A

  In the vehicle weight calculation methods as described in Patent Documents 1 and 2, the vehicle weight is calculated based on the acceleration during traveling. When determining the gear position at the time of starting based on the vehicle weight acquired by such a calculation method, the vehicle weight at the previous travel before the vehicle stops must be used. For this reason, even when the vehicle weight changes due to loading or unloading of the load while the vehicle is stopped, the shift stage is selected based on the vehicle weight at the previous travel, resulting in the clutch being An excessive load may be applied.

  FIG. 5 is a schematic diagram showing stepwise a method for determining a gear position at the start based on a vehicle weight calculation result according to a conventional method. First, as shown in FIG. 5A, when the vehicle 1 is traveling in an empty state, the vehicle weight in the empty state is obtained based on the detection value of an acceleration sensor (not shown) attached to the vehicle. It is done. Subsequently, after stopping in an empty state as shown in FIG. 5 (b), the load (container) 50 is loaded in the stopped state as shown in FIG. 5 (c). Since the vehicle weight cannot be calculated in such a stopped state, the control system of the vehicle 1 holds a running value (that is, a vehicle weight value in an empty state) as a recognized value of the vehicle weight, and the vehicle depends on the load. I cannot figure out that the weight has increased. Therefore, when starting as shown in FIG. 5 (d), a gear position based on the vehicle weight when the vehicle is empty is selected, and an excessive load may be applied to the clutch.

  The present invention has been made in view of the above problems, and provides an automatic transmission control device capable of preventing an excessive load on the clutch by selecting an appropriate start stage according to the vehicle weight. Objective.

In order to solve the above-described problems, an automatic transmission control device according to the present invention is an automatic transmission control device that sets a start stage of the automatic transmission when a vehicle equipped with the automatic transmission is in a stopped state. Vehicle weight calculation means for calculating a vehicle weight based on a traveling state at the time of the previous travel, vehicle weight fluctuation possibility determination means for determining whether or not the vehicle weight can be changed, and the calculation Control means for controlling the start stage based on the weight of the vehicle, and the control means, when the vehicle weight fluctuation possibility determination means determines that the vehicle weight can be changed, The starting stage is controlled to be lower than the starting stage determined based on the calculated vehicle weight ,
The vehicle weight fluctuation possibility determination means determines that the vehicle weight is in a state where the vehicle weight can fluctuate when detecting the connection of the cargo handling vehicle to the vehicle .

  According to the present invention, when it is determined by the vehicle weight fluctuation possibility determination means that the vehicle weight can be changed in the stopped state, the starting stage is controlled to be lower than that at the normal time. Thereby, even when the vehicle weight increases, an excessive load input to the clutch can be prevented by setting the gear position lower than usual. Note that even if the vehicle weight does not actually increase, it is possible to temporarily reduce the fuel efficiency due to a lower shift speed than usual, but it is limited to a short time at the start. The effect is small.

  The “situation in which the vehicle weight can fluctuate” broadly means a situation in which there is a possibility that the load is increased or decreased in the stopped state. Further, as described later, the vehicle weight fluctuation possibility determination means includes a wide range of means capable of detecting conditions that are highly likely to be loaded and unloaded so that the vehicle weight can change depending on the type of vehicle. Can be used.

In one aspect of the present invention, the control unit, when the vehicle weight in a stopped state by the vehicle weight variability determination means determines that there is a situation that may vary, thus calculated for the vehicle weight calculating means the vehicle weight is set to a preset reset values, to re-determine the start gear based on the reset value.
According to this aspect, when it is determined by the vehicle weight fluctuation possibility determination means that the vehicle weight can be changed in the stopped state, the calculation result by the vehicle weight calculation means is set to a preset reset value. . The reset value is preferably set to a value corresponding to a case where a certain amount of load is mounted on the vehicle and the vehicle weight increases, and more preferably about 80% of the maximum load weight. As a result, when the vehicle weight can be changed, it is assumed that the vehicle weight has increased, and the starting stage is re-determined to control the vehicle weight to be lower than normal.

In another aspect of the present invention, the vehicle further includes a gradient detection unit that detects a gradient of a road surface on which the vehicle is stopped, and the control unit normally starts the start based on the calculated vehicle weight and the detected gradient. If the vehicle weight fluctuation possibility determination means determines that the vehicle weight can be changed while controlling the stage, the start stage is compared with the normal time regardless of the detected gradient. Control to lower.
According to this aspect, when it is determined by the vehicle weight change possibility determination means that the vehicle weight can be changed in the stopped state, the start stage is set to the normal time regardless of the slope of the stopped road surface. By controlling so as to be lower than that, an excessive load input to the clutch can be more reliably prevented.

For example, the vehicle weight fluctuation possibility determination means may determine that the vehicle weight is in a state where the vehicle weight can fluctuate when detecting the connection of the cargo handling vehicle to the vehicle.
In this aspect, for example, when the vehicle is of a type that pulls the cargo handling vehicle such as a trailer, the presence or absence of the cargo handling vehicle is determined based on the output signal from the sensor that detects the coupling of the cargo handling vehicle. Based on this, it can be determined whether or not the vehicle weight can be changed.

In order to solve the above-described problems, an automatic transmission control apparatus according to the present invention sets the starting stage of the automatic transmission when a vehicle equipped with the automatic transmission is stopped. A vehicle weight calculating means for calculating a vehicle weight based on a traveling state at the time of the previous traveling;
Vehicle weight fluctuation possibility determination means for determining whether or not the vehicle weight is in a situation where it can fluctuate;
Control means for controlling the starting stage based on the calculated vehicle weight, and the control means is determined when the vehicle weight is likely to fluctuate by the vehicle weight fluctuation possibility judging means. The start stage is controlled to be lower than the start stage determined based on the calculated vehicle weight, and the vehicle weight fluctuation possibility determination means controls the operation of the cargo handling device mounted on the vehicle. When it is detected, it may be determined that the vehicle weight is in a situation where it can fluctuate.
In this aspect, for example, it is determined whether or not the vehicle weight can be changed based on the operating state of a cargo handling device that is driven when a heavy object is loaded, such as a garbage truck or a crane truck. it can.

In order to solve the above-described problems, an automatic transmission control apparatus according to the present invention sets the starting stage of the automatic transmission when a vehicle equipped with the automatic transmission is stopped. A vehicle weight calculating means for calculating a vehicle weight based on a running state at the time of the previous running, a vehicle weight fluctuation possibility judging means for judging whether or not the vehicle weight is in a situation where the vehicle weight can fluctuate, Control means for controlling the starting stage based on the calculated vehicle weight, the control means, when it is determined by the vehicle weight fluctuation possibility determination means that the vehicle weight is in a situation that can vary, the start gear is so controlled lower than the start gear which is determined based on the vehicle weight, which is the calculated, the vehicle weight variability determination means is the stop state and has the engine is running a The vehicle weight may fluctuate when the cell pedal is released, or when the parking brake is activated and the automatic transmission is in the neutral range for a predetermined period or longer. You may judge.
In this aspect, whether or not the vehicle weight can be changed based on the operating state of the engine in the stopped state, the degree of depression of the accelerator pedal, the operating state of the parking brake, and the neutral range selected by the automatic transmission. Can be determined.

  According to the present invention, when it is determined by the vehicle weight fluctuation possibility determination means that the vehicle weight can be changed in the stopped state, the starting stage is controlled to be lower than that at the normal time. Thereby, even when the vehicle weight increases, an excessive load input to the clutch can be prevented by setting the gear position lower than usual.

It is a block diagram which shows schematic structure of the whole vehicle which concerns on a present Example. It is a flowchart which shows the automatic transmission control which concerns on 1st Example. It is an example of the map which prescribes | regulates the relationship between a vehicle weight and a gradient, and the gear stage at the time of start. It is a flowchart which shows the automatic transmission control which concerns on 2nd Example. It is a schematic diagram which shows the determination method of the gear stage at the time of start based on the calculation result of the vehicle weight by the conventional method in steps.

  Hereinafter, embodiments of the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. This is just an example.

FIG. 1 is a block diagram showing a schematic configuration of the entire vehicle according to the present embodiment.
The vehicle 1 has a predetermined vehicle weight in an empty state, and the entire vehicle weight can be changed by connecting / disconnecting the cargo handling vehicle and loading / unloading the cargo handling material. The vehicle 1 has a portion that is operated and operated when the vehicle weight changes as described above, and is provided with a connecting portion 2 and a cargo handling device 3 in the example of FIG. The connecting portion 2 is a part that changes the vehicle weight by connecting / disconnecting a cargo handling vehicle that can be pulled by the vehicle 1, and is provided in, for example, a trailer vehicle. The cargo handling device 3 is a part that changes the vehicle weight by loading and unloading a load on a loading platform (not shown), and is provided in, for example, a crane vehicle.
It should be noted that the location to be operated / operated when the vehicle weight changes is not limited to the connecting portion 2 and the cargo handling device 3, and may be appropriately provided depending on the type of vehicle.

  The vehicle 1 is equipped with a diesel engine (hereinafter simply referred to as “engine”) 4 as a power source. The power of the engine 4 is transmitted to an automatic transmission (AMT) 6 via a clutch 5 and is not shown. Is transmitted to the driving wheel. The automatic transmission 6 is a so-called automatic transmission, and is controlled so that a predetermined gear position is automatically selected based on a control signal from an ECU 7 that is a control unit.

  The ECU 7 is a control unit that performs various controls in the vehicle 1, and controls operations of the engine 4, the clutch 5, and the automatic transmission 6 based on various input signals. In FIG. 1, as an internal configuration of the ECU 7, a part related to automatic transmission control according to the present embodiment is shown as a functional block, and a vehicle weight calculation unit 8 that calculates a vehicle weight based on a traveling state at the previous traveling time A vehicle weight change possibility determination unit 9 for determining whether or not the vehicle weight can be changed, a control unit 10 for controlling a shift stage at the start of the automatic transmission, and data necessary for the control, etc. The memory | storage part 11 which can memorize | store is provided.

The vehicle weight calculation unit 8 detects the acceleration of the running vehicle 1 with the acceleration sensor 12 and calculates the vehicle weight based on the detected value. As a specific vehicle weight calculation method, for example, a known method disclosed in Patent Documents 1 and 2 may be used, and detailed description thereof is omitted here.
In addition, since the detection value of the acceleration sensor 12 is used for calculation of the vehicle weight, the vehicle weight cannot be calculated in a stop state where the acceleration is zero. Therefore, the ECU 7 stores the vehicle weight (vehicle weight at the time of the previous travel) calculated during traveling when the acceleration is not zero in the storage unit 11 such as a memory, and the stored vehicle weight calculated value when the vehicle is stopped. Is considered to be the actual vehicle weight.

The vehicle weight change possibility determination unit 9 determines whether or not the vehicle 1 is in a situation where the vehicle weight can change. The vehicle weight fluctuation possibility determination unit 9 determines whether or not the vehicle weight may fluctuate based on operation states of the connecting unit 2, the cargo handling device 3, the accelerator pedal 15, the parking brake 16, the shift lever 17, and the like.
For example, when the connecting portion 2 is operated, the weight of the vehicle may fluctuate due to the connection / disconnection of the cargo handling vehicle to / from the vehicle 1. When the cargo handling device 3 is operated, there is a possibility that the weight of the vehicle fluctuates by loading / unloading a load on a loading platform (not shown). When the accelerator pedal 15 is turned off, the parking brake 16 is turned on, or the shift lever 17 is switched to neutral, this suggests that the vehicle has been stopped for a predetermined period of time, such as loading and unloading of cargo. It is considered that the vehicle weight may fluctuate.
As described above, the vehicle weight change possibility determination unit 9 determines whether or not the vehicle weight can be changed based on the operation state of each part of the vehicle 1.

  In the control unit 10, in addition to the calculation result of the vehicle weight calculation unit 8 and the determination result of the vehicle weight fluctuation possibility determination unit 9, the vehicle speed detected by the vehicle speed sensor 13 and the road surface gradient of the vehicle 1 detected by the gradient sensor 14. Based on the above, automatic transmission control for determining the gear position at the start of the automatic transmission 6 is performed.

(First embodiment)
FIG. 2 is a flowchart showing the automatic transmission control according to the first embodiment.
First, the control unit 10 of the ECU 7 determines whether or not the vehicle 1 is stopped based on the detection value of the vehicle speed sensor 13 (step S101). When the vehicle 1 is not stopped (step S101: NO), the control unit 10 repeats step S101 and waits. In this case, since the vehicle 1 is in the running state, the vehicle weight calculation unit 8 calculates the vehicle weight based on the detection value of the acceleration sensor 12 and stores / updates the result in the storage unit 11.

  When the vehicle 1 is in a stopped state (step S101: YES), the control unit 10 acquires the vehicle weight stored in the storage unit 11 and the road surface gradient value detected by the gradient sensor 14 (step S102). Here, the vehicle weight calculated by the vehicle weight calculation unit 8 is stored in the storage unit 11, and the control unit 10 obtains the latest vehicle weight by accessing the storage unit 7 as necessary. Can do.

  When the vehicle 1 is stopped, the vehicle weight calculation unit 8 cannot calculate the vehicle weight in real time because the detection value from the acceleration sensor 12 becomes zero. In this case, the control unit 10 adopts the vehicle weight calculated during the previous travel stored in the storage unit 11 and proceeds with the following processing.

Subsequently, the control unit 10 determines the gear position at the start based on the vehicle weight and the gradient value acquired in step S102 (step S103). The relationship between the vehicle weight and gradient and the gear position at the start is stored in advance in the storage unit 11 as a map, and the control unit 11 calculates the map so that the gear stage at the start corresponding to the vehicle weight is selected. Is done.
Here, FIG. 3 is an example of a map that defines the relationship between the vehicle weight and gradient and the gear position at the start. In this example, the vertical axis shows the vehicle weight, and the horizontal axis shows the absolute value of the gradient (takes a positive value for uphill and takes a negative value for downhill) A different starting stage is defined for each area separated by a broken line. The start stage is set so that the start stage becomes lower as the vehicle weight increases, and the start stage becomes lower as the gradient increases, and the first speed is selected as the start stage in the area shown in FIG. , (B), the second speed is selected as the start stage, and in the area (c), the third speed is selected as the start stage.
In this embodiment, the selection of the gear position at the start is determined in consideration of both the vehicle weight and the gradient, but the gear position at the start may be selected based only on the vehicle weight.

  Subsequently, it is determined in the vehicle weight change possibility determination unit 9 of the ECU 7 whether or not the vehicle weight is likely to change (step S104). The vehicle weight fluctuation possibility determination unit 9 acquires the operating state of the connecting unit 2, the cargo handling device 3, the accelerator pedal 15, the parking brake 16, the shift lever 17, and the like provided in the vehicle 1, so that the vehicle that is stopped 1, it is determined whether or not the vehicle weight is likely to fluctuate.

  If it is determined that the vehicle weight may change (step S104: YES), the control unit 10 changes the gear position at the time of starting to be lower than the gear position at the time of starting determined in step S103 (step S105). ). In step S103, as described above, since the vehicle weight cannot be calculated when the vehicle is stopped, the gear position at the start is determined based on the vehicle weight during the previous run stored in the storage unit 11. For this reason, if the vehicle weight increases while the vehicle is stopped, if the vehicle starts with the gear determined in step S103, the input load on the clutch may become excessive. Therefore, in step S105, when there is a possibility that the vehicle weight may fluctuate, an excessive load input to the clutch can be prevented by changing the gear position at the start determined in step S103 to be low.

  In step S104, since the “possibility” that the vehicle weight fluctuates is determined, it may be considered that the vehicle weight does not actually increase. However, even in such a case, although it is possible that the fuel efficiency is temporarily lowered by lowering the gear position than usual, it is limited to a very short time at the start and the influence is small.

(Second embodiment)
FIG. 4 is a flowchart showing automatic transmission control according to the second embodiment. Since steps S201 to S203 shown in FIG. 4 are the same as steps S101 to S103 shown in FIG. 2, detailed description thereof will be omitted here.

  In the first embodiment described above, in step S104, the vehicle weight fluctuation possibility determination unit 9 determines whether or not the vehicle weight may fluctuate. In the second embodiment, the connection unit 2 or A more specific determination is made assuming an industrial vehicle including the cargo handling device 3.

  In step S204, it is determined whether or not the vehicle weight is likely to fluctuate by grasping the operating state of the connecting part 2 in the vehicle weight fluctuation possibility determination part 9. The connecting part 2 is a part that performs a connecting operation in order to pull a cargo handling vehicle, such as a trailer. It is suggested that when the connecting portion 2 is operated when the vehicle 1 is stopped, the cargo handling vehicle is connected to or disconnected from the vehicle 1, and the vehicle weight fluctuation possibility determining portion 9 is Determine that weight may vary.

  In step S205, it is determined whether or not the vehicle weight is likely to fluctuate by grasping the operation state of the cargo handling device 3 in the vehicle weight fluctuation possibility determination unit 9. The cargo handling device 3 is a part that operates when loading and unloading heavy objects, such as a crane truck. It is suggested that when the cargo handling device 3 is operated while the vehicle 1 is in a stopped state, the load is unloaded on the vehicle 1. It is determined that there is a possibility of fluctuation.

  In step S206, whether or not there is a possibility that the vehicle weight may fluctuate by grasping the operation state of the engine 4, the operation state of the accelerator pedal 15, the parking brake 16, and the shift lever 17 in the vehicle weight fluctuation possibility determination unit 9. Is determined. For example, the vehicle weight fluctuation possibility determination unit 9 is in a state where the engine 1 is movable and the accelerator pedal 15 is released or the parking brake 16 is operated and the automatic transmission 6 is in the neutral state when the vehicle is stopped. When the state selected for the range continues for a predetermined period or longer, it is determined that the vehicle weight is in a situation that can fluctuate.

  Note that the determination steps shown in steps S204 to S206 are merely examples, and are not limited as long as the determination is performed based on a situation where the vehicle weight may fluctuate. That is, it may be realized by empirically grasping a situation in which the vehicle weight is likely to fluctuate and incorporating means for determining the situation.

  In the present embodiment, the presence / absence of the possibility of fluctuation of the vehicle weight is determined based on three steps S204 to S206 which are different determination criteria. Thereby, the possibility of fluctuations in the vehicle weight can be determined from a plurality of viewpoints.

  When it is determined in steps S204 to S206 that the vehicle weight may vary (step S204: YES, step S205: YES, step S206: YES), the control unit 10 uses the vehicle weight stored in the storage unit 11. Reset (step S207). The reset value is preferably set to a value corresponding to a case where a certain amount of load is mounted on the vehicle 1 and the vehicle weight increases, and more preferably about 80% of the maximum load weight. By resetting the vehicle weight stored in the storage unit 11 in this way, the gear position at the time of start is determined again with the reset vehicle weight (step S208).

  As described above, according to the present embodiment, when the vehicle weight change possibility determination unit 9 determines that the vehicle weight can be changed in the stopped state, the starting stage becomes lower than the normal time. To control. Thereby, even when the vehicle weight increases, an excessive load input to the clutch can be prevented by setting the gear position lower than usual.

  The present invention is applicable to an automatic transmission control device that sets a starting stage of the automatic transmission when a vehicle equipped with the automatic transmission is in a stopped state.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Connection part 3 Handling apparatus 4 Engine 5 Clutch 6 Automatic transmission 8 Vehicle weight calculation part 9 Vehicle weight fluctuation possibility determination part 10 Control part 11 Memory | storage part 12 Acceleration sensor 13 Vehicle speed sensor 14 Gradient sensor 15 Accelerator pedal 16 Parking brake 17 Shift lever

Claims (5)

An automatic transmission control device that sets a start stage of the automatic transmission when a vehicle equipped with the automatic transmission is in a stopped state,
Vehicle weight calculating means for calculating the vehicle weight based on the traveling state at the time of the previous traveling;
Vehicle weight fluctuation possibility determination means for determining whether or not the vehicle weight is in a situation where it can fluctuate;
Control means for controlling the starting stage based on the calculated vehicle weight,
The control means determines that the start stage is determined based on the calculated vehicle weight when the vehicle weight change possibility determination means determines that the vehicle weight can be changed. Control it to be lower than
The automatic transmission control apparatus according to claim 1, wherein the vehicle weight fluctuation possibility determination means determines that the vehicle weight is in a state where the vehicle weight can fluctuate when detecting the connection of the cargo handling vehicle to the vehicle .   An automatic transmission control device that sets a start stage of the automatic transmission when a vehicle equipped with the automatic transmission is in a stopped state,
  Vehicle weight calculating means for calculating the vehicle weight based on the traveling state at the time of the previous traveling;
  Vehicle weight fluctuation possibility determination means for determining whether or not the vehicle weight is in a situation where it can fluctuate;
  Control means for controlling the starting stage based on the calculated vehicle weight;
With
  The control means determines that the start stage is determined based on the calculated vehicle weight when the vehicle weight change possibility determination means determines that the vehicle weight can be changed. Control it to be lower than
  The automatic transmission control device according to claim 1, wherein the vehicle weight change possibility determination means determines that the vehicle weight is in a state of being variable when the operation of a cargo handling device mounted on the vehicle is detected.   An automatic transmission control device that sets a start stage of the automatic transmission when a vehicle equipped with the automatic transmission is in a stopped state,
  Vehicle weight calculating means for calculating the vehicle weight based on the traveling state at the time of the previous traveling;
  Vehicle weight fluctuation possibility determination means for determining whether or not the vehicle weight is in a situation where it can fluctuate;
  Control means for controlling the starting stage based on the calculated vehicle weight;
With
  The control means determines that the start stage is determined based on the calculated vehicle weight when the vehicle weight change possibility determination means determines that the vehicle weight can be changed. Control it to be lower than
  The vehicle weight fluctuation possibility determining means is configured such that when the vehicle is stopped, the engine is running and the accelerator pedal is released, or the parking brake is activated and the automatic transmission is selected to the neutral range. An automatic transmission control device that determines that the vehicle weight is in a state where the vehicle weight may fluctuate when the vehicle has been in a state for a predetermined period or longer. Wherein, when said vehicle weight is determined to be in circumstances that may vary, preset the vehicle weight thus calculated in the vehicle weight calculating means in stopped state by the vehicle weight variability determination means has been set to the reset value, the automatic transmission control device according to any one of claims 1 to 3, characterized in that the re-determining the start gear based on the reset value. Further comprising gradient detecting means for detecting the gradient of the road surface on which the vehicle is stopped;
While the control means normally controls the start stage based on the calculated vehicle weight and the detected gradient, it is determined that the vehicle weight can be changed by the vehicle weight change possibility determination means. is the case was, the irrespective of the detected gradient, automatic transmission according to claim 1, any one of 4, wherein the controller controls to be lower than the start gear during normal Control device.

Images