JP2004190808A - Clutch control unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clutch control unit that can calculate the control quantity of the clutch by a simple calculation algorithm. <P>SOLUTION: This clutch control unit provides the map that the correspondence relation between the transmittable torque value (clutch joint torque TClnc) and the revolution speed (engine revolution speed Ne) of an internal combustion engine is prescribed by a clutch, and decides the control quantity of the clutch according to the clutch joint torque TClnc that is calculated through this map. In the map that the correspondence relation between the engine revolution speed Ne and the clutch joint torque TClnc is prescribed, the correspondence relation of these respective parameters is prescribed so as to shift the clutch joint torque TClnc from the torque value corresponding to the creep action of the vehicle to the torque value corresponding to the start action of the vehicle according to the rise of the engine revolution speed Ne. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a clutch control device that changes a clutch engagement state.
[0002]
[Prior art]
As is well known, a clutch control device that automates the operation of a clutch in a vehicle equipped with a manual transmission has been put to practical use. As such a clutch control device, for example, a device described in Patent Document 1 is known.
[0003]
When a request to drive the vehicle by a creep operation or a start operation is detected, the device described in the document 1 calculates the clutch operation amount in the following manner.
That is, based on the calculation algorithm for calculating the clutch operation amount during the creep operation of the vehicle and the operation amount calculated from the calculation algorithm for calculating the clutch operation amount during the vehicle start operation, Calculate the clutch operation amount.
[0004]
Then, the clutch actuator is operated according to the calculated operation amount of the clutch, and the engagement state of the clutch is changed. Thereby, the torque transmitted from the internal combustion engine to the manual transmission is adjusted, and the behavior of the vehicle according to the driver's request can be obtained.
[0005]
[Patent Document 1]
Tokiohei 11-508350
[0006]
[Problems to be solved by the invention]
By the way, in the clutch control device described in Patent Literature 1, the final operation amount of the clutch is calculated based on the calculation result from the two calculation algorithms as described above, so that the same operation amount is calculated. Calculation algorithm becomes complicated.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a clutch control device capable of calculating a clutch operation amount by a simple calculation algorithm.
[0008]
[Means for Solving the Problems]
Hereinafter, the means for achieving the above object and the effects thereof will be described.
According to a first aspect of the present invention, there is provided a torque calculating means for calculating a value of a torque that can be transmitted by a clutch on the basis of a rotation speed of an on-vehicle internal combustion engine, and the clutch is provided in accordance with the value of the torque calculated by the torque calculating means. A clutch control device for determining an operation amount of the vehicle-mounted internal combustion engine, wherein a torque value corresponding to a creep operation of the vehicle and a torque value corresponding to a start operation of the vehicle are taken into account. The gist is that the correspondence between the rotational speed of the engine and the value of the torque that can be transmitted by the clutch is defined.
[0009]
According to the above configuration, the clutch control device includes the torque calculating unit in which the correspondence between the rotational speed of the vehicle-mounted internal combustion engine and the value of the torque that can be transmitted by the clutch is set in the above-described manner. Incidentally, when the behavior of the vehicle transitions between the start operation and the creep operation, the behavior of the vehicle is usually reflected on the rotation speed of the vehicle-mounted internal combustion engine. Therefore, by using the torque calculating means, it is possible to appropriately determine the torque that can be transmitted by the clutch without clearly determining which of the above operations the vehicle is in. That is, it is possible to calculate the torque that can be transmitted by the clutch at the time of the creep operation and the start operation of the vehicle through only the torque calculation means. Thus, by employing the above configuration, the operation amount of the clutch can be calculated by a simple calculation algorithm.
[0010]
According to a second aspect of the present invention, there is provided a torque calculating means for calculating a value of a torque that can be transmitted by a clutch based on a rotation speed of an on-vehicle internal combustion engine. A clutch control device that determines an operation amount of the vehicle, wherein the torque calculating unit determines that a value of a torque that can be transmitted by the clutch corresponds to a creep operation of the vehicle in accordance with an increase in a rotation speed of the vehicle-mounted internal combustion engine. The relationship between the rotational speed of the on-vehicle internal combustion engine and the value of the torque that can be transmitted by the clutch is defined so that the value of the vehicle shifts from the value of? To the value of the torque corresponding to the starting operation of the vehicle. It is a gist.
[0011]
According to the above configuration, the clutch control device includes the torque calculating unit in which the correspondence between the rotational speed of the vehicle-mounted internal combustion engine and the value of the torque that can be transmitted by the clutch is set in the above-described manner. By adopting such a configuration, it is possible to obtain an operation and effect similar to the operation and effect of the first aspect of the present invention.
[0012]
According to a third aspect of the present invention, there is provided a torque calculating means for calculating, based on the rotational speed of the vehicle-mounted internal combustion engine, a value of a torque that can be transmitted by the clutch required at the time of starting operation of the vehicle, and the torque calculating means calculates the torque. A clutch control device that determines an operation amount of the clutch according to a torque value, wherein the torque calculation unit determines that a minimum value of a torque that can be transmitted by the clutch is a torque corresponding to a creep operation of the vehicle. The gist is that the value is set as a reference and the correspondence between the value of the torque that can be transmitted by the clutch and the rotational speed of the vehicle-mounted internal combustion engine is defined.
[0013]
According to the above configuration, the clutch control device includes the torque calculating unit in which the correspondence between the rotational speed of the vehicle-mounted internal combustion engine and the value of the torque that can be transmitted by the clutch is set in the above-described manner. By adopting such a configuration, it is possible to obtain an operation and effect similar to the operation and effect of the first aspect of the present invention.
[0014]
According to a fourth aspect of the present invention, in the clutch control device according to any one of the first to third aspects, a torque value corresponding to the creep operation of the vehicle is set to be constant with respect to a rotation speed of the vehicle-mounted internal combustion engine. The main point is that
[0015]
According to the above configuration, the value of the torque corresponding to the creep operation of the vehicle is set to be constant with respect to the rotation speed of the vehicle-mounted internal combustion engine. This makes it possible to obtain a stable behavior of the vehicle during the creep operation of the vehicle.
[0016]
According to a fifth aspect of the present invention, there is provided a torque calculating means for calculating, based on the rotational speed of the vehicle-mounted internal combustion engine, a value of a torque which can be transmitted by the clutch required at the time of the starting operation of the vehicle, and is calculated by the torque calculating means. A clutch control device that determines an operation amount of the clutch according to a value of torque, wherein the torque calculation unit includes a region that enables a creep operation of the vehicle, and includes a rotation speed of the vehicle-mounted internal combustion engine and a rotation speed of the vehicle-mounted internal combustion engine. The gist is that the correspondence relationship with the torque that can be transmitted by the clutch is specified.
[0017]
According to the above configuration, the clutch control device includes the torque calculating unit in which the correspondence between the rotational speed of the vehicle-mounted internal combustion engine and the value of the torque that can be transmitted by the clutch is set in the above-described manner. By adopting such a configuration, it is possible to obtain an operation and effect similar to the operation and effect of the first aspect of the present invention.
[0018]
According to a sixth aspect of the present invention, in the clutch control device according to the fifth aspect, in a region where the creep operation of the vehicle is enabled, a value of a torque that can be transmitted by the clutch is different from a rotation speed of the on-vehicle internal combustion engine. The gist is that it is set to be constant.
[0019]
According to the above configuration, the value of the torque that can be transmitted by the clutch is set to be constant with respect to the rotational speed of the vehicle-mounted internal combustion engine in a region where the vehicle can perform the creep operation. By adopting such a configuration, the operation and effect similar to the operation and effect of the invention described in claim 4 can be obtained.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment)
An embodiment of a clutch control device according to the present invention will be described with reference to FIGS.
[0021]
First, the configuration of the entire apparatus will be described with reference to FIG.
In the vehicle 1, transmission of rotation from the crankshaft 12, which is the output shaft of the internal combustion engine 11, to the transmission 13 can be switched on and off through the clutch 14.
[0022]
The transmission 13 reduces the rotation input from the crankshaft 12 according to the combination of the gears 13G. Further, the transmission 13 is provided with a differential gear 15, so that the reduced rotation can be transmitted to the differential gear 15 through the gear 13 </ b> G. The differential gear 15 reduces the rotation input from the transmission 13 and transmits the rotation to the drive shaft 16. Then, the drive wheels 17 rotate with the rotation of the drive shaft 16.
[0023]
Further, the vehicle 1 is provided with a clutch actuator 18 for operating the clutch 14, and the engagement state of the clutch 14 can be changed through the actuator 18. Incidentally, the engaged state of the clutch 14 changes from a completely released state (a state in which rotation is not transmitted from the internal combustion engine 11 to the transmission 13) to a completely connected state (the internal combustion engine) in accordance with the operation amount of the clutch actuator 18. 11 and the rotational speed input to the transmission 13 through the clutch 14).
[0024]
By changing the engagement state of the clutch 14, the magnitude of the torque (clutch engagement torque TClnc) that can be transmitted from the internal combustion engine 11 to the transmission 13 via the clutch 14 can be adjusted. Then, at the time of the creep operation and the start operation of the vehicle 1, a desired behavior can be obtained by changing the engagement state of the clutch 14.
[0025]
Further, the vehicle 1 is provided with a brake pedal BP operated by the driver, and when the operation amount of the brake pedal BP is equal to or more than a predetermined amount, the brake switch 21 is turned on. The detection data from the brake switch 21 is input to an electronic control unit (ECU) 3.
[0026]
The ECU 3 determines a request from the driver based on the detection data from the brake switch 21 as follows. That is,
[A] When the brake switch 21 is on, there is a request to keep the vehicle 1 in a stopped state (idle state).
[B] When the brake switch 21 is off, there is a request to drive the vehicle 1 by either a creep operation or a start operation.
In this manner, the driver's request is determined.
[0027]
Further, the ECU 3 is further input with a rotation speed (engine rotation speed Ne) of the crankshaft 12 detected through the rotation speed sensor 22 and the like. The ECU 3 controls the clutch actuator 18 based on the detection data of the rotation speed sensor 22 and the detection data of the brake switch 21.
[0028]
By the way, in the conventional clutch control device, a calculation algorithm for calculating a clutch operation amount corresponding to a vehicle creep operation, and a calculation algorithm for calculating a clutch operation amount corresponding to a vehicle start operation are described. To calculate the final operation amount of the clutch.
[0029]
Therefore, the calculation algorithm for calculating the final clutch operation amount becomes complicated. In particular, at the time of switching between the creep operation and the start operation of the vehicle, it is necessary to smoothly switch these operations while suppressing the shock of the vehicle, so that the process for calculating the operation amount of the clutch becomes more complicated. I can say.
[0030]
Therefore, in the present embodiment, the above-mentioned concern is resolved by performing the following clutch operation processing.
Hereinafter, the clutch operation process will be described with reference to FIGS. This process includes a request determination process for determining a driver's request (FIG. 2) and a torque calculation process for calculating the clutch engagement torque (FIG. 3).
[0031]
First, the request determination process will be described with reference to FIG. Note that this process is repeatedly executed at predetermined intervals.
As shown in FIG. 2, in the present process, when it is detected that there is a request to drive the vehicle 1 by a creep operation or a start operation based on the detection data from the brake switch 21 (step S100: Yes), it will be described later. A torque calculation process (FIG. 3) is performed (step S200). On the other hand, when it is detected that there is a request to maintain the vehicle 1 in the stopped state, the present process is temporarily ended.
[0032]
Next, the torque calculation process will be described with reference to FIGS. This process is also repeatedly executed at a predetermined cycle.
As shown in FIG. 3, in the present process, first, the engine rotation speed Ne detected through the rotation speed sensor 22 is read (step S201).
[0033]
Next, the clutch engagement torque TClnc is calculated by applying the read engine rotation speed Ne to a map (FIG. 4) defining the relationship between the engine rotation speed and the clutch engagement torque. In the present embodiment, a map in which the relationship between the engine rotation speed and the clutch engagement torque is defined is a unit corresponding to a torque calculating unit.
[0034]
Here, the correspondence between the engine speed Ne and the clutch engagement torque TClnc specified in the above map will be described.
In the map, the clutch engagement torque TClnc corresponds to the starting operation of the vehicle based on the torque value corresponding to the creep operation of the vehicle with respect to the increase in the engine rotation speed Ne based on the idle rotation speed Neid. The correspondence between these parameters (Ne, TClnc) is defined so as to show a tendency to shift to the torque value.
[0035]
Here, the value of the torque corresponding to the creep operation indicates the clutch engagement torque TClnc (creep torque TCcp) required during the creep operation of the vehicle. In the present embodiment, the correspondence between the parameters is defined such that the clutch engagement torque TClnc required during the creep operation shows a constant value with respect to the engine rotation speed Ne.
[0036]
Further, the value of the torque corresponding to the above-described start operation indicates the clutch engagement torque TClnc required at the time of the start operation of the vehicle. In the present embodiment, the correspondence between the parameters is defined such that the clutch engagement torque TClnc required at the time of the starting operation increases exponentially with an increase in the engine rotation speed Ne. I have.
[0037]
Thus, when the engine speed Ne changes in response to the driver's operation of the accelerator pedal, the clutch engagement torque TClnc corresponding to the change in the engine speed Ne is calculated. The transition to is performed smoothly.
[0038]
Incidentally, in a predetermined map that defines the correspondence between the engine rotation speed Ne and the clutch engagement torque TClnc corresponding to the starting operation of the vehicle, a region enabling the vehicle to perform the creep operation (the clutch engagement torque corresponding to the creep operation) An area in which TClnc is set) may be provided, and this may be adopted as a map corresponding to the above map (FIG. 4).
[0039]
Next, the clutch engagement torque TClnc calculated from the map (FIG. 4) is set as the target torque TCtgt, and the process is temporarily terminated (step S203).
[0040]
Then, the target torque TCtgt is converted into an operation amount of the clutch 14 through a separately performed process. By driving the clutch actuator 18 according to the converted operation amount of the clutch 14, the engagement state of the clutch 14 is changed. Thereby, torque for satisfying the behavior of the vehicle 1 requested by the driver can be transmitted from the internal combustion engine 11 to the transmission 13.
[0041]
As described above, according to the clutch operation process (FIGS. 2 to 4), when there is a request to drive the vehicle 1 in either the creep operation or the start operation, the clutch engagement is performed in accordance with the transition of the engine rotation speed Ne. The torque TClnc is calculated based on a map in which the combined torque TClnc is defined.
[0042]
According to such a configuration, the engine speed is applied to the map (FIG. 4) without performing a process of clearly determining whether the behavior required for the vehicle is a creep operation or a start operation. Only by this, it is possible to obtain the clutch engagement torque corresponding to the creep operation and the starting operation. That is, it is not necessary to separately provide a calculation algorithm for calculating the clutch engagement torque corresponding to the creep operation of the vehicle and a calculation algorithm for calculating the clutch engagement torque corresponding to the start operation of the vehicle. Thereby, the calculation algorithm for calculating the clutch engagement torque is simplified.
[0043]
Further, in the map (FIG. 4), these parameters are set so that the clutch engagement torque changes from the torque value corresponding to the creep operation to the torque value corresponding to the start operation in accordance with the change in the engine rotation speed. Since the correspondence is defined, switching between the creep operation and the start operation of the vehicle can be smoothly performed.
[0044]
As described above in detail, according to the clutch control device of the present embodiment, the following excellent effects can be obtained.
(1) In the present embodiment, the clutch engagement torque TClnc changes from a torque value corresponding to the creep operation of the vehicle 1 to a torque value corresponding to the start operation of the vehicle 1 in accordance with the increase in the engine rotation speed Ne. The clutch engagement torque TClnc is calculated through a map in which the relationship between these parameters is defined so as to change. Thus, the operation amount of the clutch 14 can be calculated by a simple calculation algorithm.
[0045]
(2) Further, the switching between the creep operation and the start operation of the vehicle 1 is smoothly performed.
(3) In the conventional processing, since the final operation amount of the clutch is calculated from the two calculation algorithms, the calculation algorithm is particularly complicated when switching between the creep operation and the start operation. I was concerned. In this regard, in the above configuration, since the torque TClnc is calculated from the correspondence between the engine rotation speed Ne and the clutch engagement torque TClnc that are defined in advance, the calculation algorithm is not complicated. Become like
[0046]
(4) In the present embodiment, the correspondence between these parameters is defined so that the clutch engagement torque TClnc required during the creep operation of the vehicle 1 shows a constant value with respect to the engine rotation speed Ne. I have. Thereby, during the creep operation of the vehicle 1, a stable behavior of the vehicle can be realized.
[0047]
In addition, the above-mentioned embodiment can also be implemented as the following forms, for example, by changing this appropriately.
In the above embodiment, the request for the vehicle 1 is determined through the request determination processing shown in FIG. 2. However, for example, the following change may be made. That is, it is also possible to adopt a configuration in which the operation amount of the accelerator pedal is monitored, and a request from the driver for the vehicle 1 is determined in consideration of the operation amount. In short, the request determination process is not limited to the configuration illustrated in the above-described embodiment, and any configuration can be adopted as long as the configuration can appropriately determine a request for the vehicle 1 from the driver.
[0048]
In the above-described embodiment, the clutch engagement torque TClnc is calculated by applying the engine rotation speed Ne to the map (FIG. 4) of the engine rotation speed and the clutch engagement torque. It is also possible. That is, the clutch engagement torque TClnc can be calculated from the function of the engine speed Ne instead of the map. In other words, the calculation result indicating that the clutch engagement torque TClnc tends to change from a torque value corresponding to the creep operation of the vehicle to a torque value corresponding to the start operation of the vehicle in response to the increase in the engine rotation speed Ne is obtained. The obtained function can be adopted as a means corresponding to the torque calculating means. Incidentally, the calculation result by this function is shown, for example, as a relationship between the engine rotation speed Ne and the clutch engagement torque TClnc in the map of FIG.
[0049]
In the above embodiment, in the correspondence between the engine rotation speed Ne and the clutch engagement torque TClnc, the clutch engagement torque TClnc (creep torque TCcp) corresponding to the creep operation is set to be constant with respect to the engine rotation speed Ne. However, for example, it is also possible to change as follows. That is, the correspondence between these parameters can be defined so that the clutch engagement torque TClnc corresponding to the creep operation increases as the engine speed Ne increases. In short, if the correspondence between the engine rotation speed Ne and the clutch engagement torque TClnc has an area corresponding to the creep operation and is defined, the correspondence is not limited to the correspondence exemplified in the above embodiment. However, it can be changed as appropriate.
[0050]
In the above embodiment, the map (FIG. 4) defining the correspondence between the engine rotation speed Ne and the clutch engagement torque TClnc based on the idle rotation speed Neid is adopted. However, the map may be changed as follows, for example. it can. That is, the clutch engagement torque TClnc can be defined for the engine rotation speed Ne lower than the idle rotation speed Neid. In this case, the clutch engagement torque TClnc can be set to a value less than the torque TCcp based on the creep torque TCcp. In such a case, for example, when the engine rotation speed Ne falls below the idle rotation speed Neid due to engagement of the clutch, the clutch engagement torque TClnc is changed to a lower value in accordance with the degree of decrease in the engine rotation speed Ne. Therefore, the stall of the internal combustion engine is suppressed.
[0051]
The relationship between the engine rotation speed Ne and the clutch engagement torque TClnc in the above embodiment is not limited to the relationship exemplified in the embodiment, and can be appropriately changed. In short, the configuration is such that the correspondence between the engine speed and the clutch engagement torque is defined by taking into account the torque value corresponding to the creep operation of the vehicle and the torque value corresponding to the start operation of the vehicle. For example, an appropriate configuration can be adopted without being limited to the configuration exemplified in the above embodiment.
[0052]
The configuration of the entire apparatus is not limited to the configuration exemplified in the above embodiment, and an appropriate configuration can be adopted. In short, the present invention is applicable to any clutch control device that changes the engagement state of the clutch through the actuator, and even in such a case, an operation and effect similar to the operation and effect of the above embodiment can be obtained. Become like
[Brief description of the drawings]
FIG. 1 is a schematic diagram schematically showing an overall configuration of a clutch control device according to an embodiment of the present invention;
FIG. 2 is a flowchart showing a request determination process in a clutch operation process performed in the embodiment.
FIG. 3 is a flowchart showing a torque calculation process in a clutch operation process performed in the embodiment.
FIG. 4 is a map showing a correspondence relationship between an engine rotation speed and a clutch engagement torque used in a torque calculation process performed in the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Vehicle, 11 ... Internal combustion engine, 12 ... Crankshaft, 13 ... Transmission, 13G ... Gear, 14 ... Clutch, 15 ... Differential gear, 16 ... Drive shaft, 17 ... Drive wheel, 18 ... Clutch actuator, BP ... Brake pedal , 21 ... brake switch, 22 ... rotational speed sensor, 3 ... electronic control unit (ECU).

Claims (6)

Clutch control means for calculating a value of torque transmittable by the clutch based on the rotational speed of the vehicle-mounted internal combustion engine; and determining an operation amount of the clutch in accordance with the value of the torque calculated by the torque calculation means. A device,
The torque calculation means includes a torque value corresponding to the creep operation of the vehicle and a torque value corresponding to the start operation of the vehicle, and the rotational speed of the vehicle-mounted internal combustion engine and the torque that can be transmitted by the clutch. A clutch control device, wherein a correspondence relationship with a value is defined. Clutch control means for calculating a value of torque transmittable by the clutch based on the rotational speed of the vehicle-mounted internal combustion engine; and determining an operation amount of the clutch in accordance with the value of the torque calculated by the torque calculation means. A device,
The torque calculating means is configured to determine a value of a torque that can be transmitted by the clutch from a value of a torque corresponding to a creep operation of the vehicle according to an increase in a rotation speed of the on-vehicle internal combustion engine. A relationship between the rotational speed of the vehicle-mounted internal combustion engine and the value of the torque that can be transmitted by the clutch is defined so as to change to a value. Torque calculating means for calculating a value of torque transmittable by a clutch required at the time of starting operation of the vehicle, based on a rotational speed of the vehicle-mounted internal combustion engine; A clutch control device for determining an operation amount of
The torque calculating means sets a minimum value of a value of a torque that can be transmitted by the clutch with reference to a value of a torque corresponding to a creep operation of the vehicle. A clutch control device, wherein a correspondence relationship with an engine speed is defined. The clutch control device according to any one of claims 1 to 3, wherein a torque value corresponding to a creep operation of the vehicle is set to be constant with respect to a rotation speed of the vehicle-mounted internal combustion engine. Torque calculating means for calculating a value of torque transmittable by a clutch required at the time of starting operation of the vehicle, based on a rotational speed of the vehicle-mounted internal combustion engine; A clutch control device for determining an operation amount of
The torque calculation means is provided with a region that enables the creep operation of the vehicle, and defines a correspondence relationship between a rotational speed of the vehicle-mounted internal combustion engine and a torque that can be transmitted by the clutch. And a clutch control device. 6. The clutch control device according to claim 5, wherein a value of a torque that can be transmitted by the clutch is set to be constant with respect to a rotation speed of the on-vehicle internal combustion engine in a region where the creep operation of the vehicle is enabled.

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