JP4570350B2 - Clutch control device - Google Patents

Description

The present invention relates to improvements in automatic car which does not require manipulation of the clutch pedal. The present invention is used for clutch control of a vehicle equipped with a mechanical clutch, particularly a dry clutch. The present invention has thus also utilizing clutch pedal at the time and acceleration start of the vehicle, by operating the access Lupe Dar relates to improvements in apparatus for controlling both the engine rotational speed and the clutch stroke. The present invention is an apparatus developed for use in large vehicles such as trucks and buses, but can be widely used in other vehicles.

Bus, even large vehicles such as trucks, equipped with automatic clutch control device is designed such that there is no need to take the clutch pedal each speed change operation device is widely used. For large vehicles applicant is manufactured and sold, is provided with the clutch pedal in the driver's seat, the shift operation during running, each time there is no need to operate the clutch pedal, the clutch disengagement, gear shift Devices that automatically execute a series of steps including gear switching and clutch connection are widely used. Also such vehicles, when the vehicle starts from a stopped state, when retracted traveling, or in a case where fine speed traveling, etc. unloading field cargo, by utilizing the clutch pedal, override automatic clutch control Therefore, it is recommended to perform driving operation. This is because when the vehicle starts or when traveling at a low speed, it is possible to operate the clutch more smoothly, and the professional driver does not think that performing the delicate clutch operation is so inconvenient. One of the reasons.

Some of the large bus, equipped with a wet clutch, is also manufactured vehicle with no need to operate the clutch pedal from the time of starting. Wet clutches can generally be designed so that the clutch is allowed to slip, even though the clutch may last for a reasonably long time.

[Patent Document 1] (Applicant, Isuzu) describes an invention in which a plurality of control maps are set in a control device to facilitate the control of an automatic clutch at the time of starting.
Japanese Patent Publication No. 2-43048

  The wet clutch has a complicated structure and is expensive. In addition, maintenance man-hours also increase. Therefore, a wet clutch is not easily adopted in a freight vehicle in which the cost per mileage is severely discussed. Even when a dry clutch is used, the technique described in [Patent Document 1] and an improved technique for performing similar servo control are not currently used in many vehicles. Absent.

When clutch Chis stroke (or degree of coupling clutch) automatically controlled by a servo system, control is control in critical places that are executed are known to easily becomes unstable. To illustrate this, when the clutch is controlled to the so-called half-clutch state, access Lupe Dal is depressed, the rotational speed of the engine increases, the degree of coupling of the clutch is increased by the control of the clutch control device. As a result, the load on the engine increases and the rotational speed of the engine decreases. If it does so, the automatic control system of a clutch control apparatus will act, and it will be controlled so that the coupling | bonding degree of a clutch may become small conversely. When the clutch coupling degree is reduced, the engine load is reduced and the engine rotational speed is increased, whereby the clutch coupling degree is controlled to increase again. That is, due to such a causal relationship, an unstable state continues, and a situation in which control is not smoothly executed in one direction occurs.

When this occurs, the vehicle clutch pedal is equipped, override automatic control by the driver depresses the clutch pedal, it can be removed from the unstable control state . That under all circumstances, the only access Lupe Dar, to achieve a clutch control device that together smoothly control the clutch and the engine rotation is still problems.

The present invention was made in this background, the operation of the access Lupe Dar, and an object thereof is to provide a device which can simultaneously smoothly control the engine and clutch. The present invention, at the start of the vehicle, at a very low speed running, or even at the time of reverse travel, without requiring the operation of the clutch pedal, providing a clutch control device capable of controlling smooth clutch control and engine rotational speed The purpose is to do. The present invention utilizes relatively inexpensive dry mechanical clutch, without the need for manipulation of the clutch pedal, and an object thereof is to provide an apparatus for implementing a smooth clutch control.

The present invention is, in a state where the clutch is slipping, in response to access Lupe Dar operation amount of input (alpha), a feed forward control means for executing the control map control clutch Chis stroke (S), the clutch rotational angular velocity the configuration used in combination with feedback control means for holding the clutch lactis strokes by reference while acceleration to target the most important feature. As a result, it is possible to avoid falling into an unstable state of instructions.

In other words, such as during starting or low-speed running of the vehicle, when the clutch is shifted to a state where slipping from a fully released state, the feed forward control controls the clutch Chis stroke. This performs by referring to a control map representing a clutch Chis stroke for access Lupe Dal operation amount. The control map is in correspondence with the access Lupe Dar operation amount is a map that outputs the clutch lactis stroke, the map of the three-dimensional function representing this as a function of the elapsed time.

Meanwhile fuel supply to the engine, while the map control is being executed, sets the target rotation angular velocity corresponding to the access Lupe Dal operation amount at that time, as the engine rotational angular velocity approaches its target rotational angular velocity Execute control. This state continues until the rotational speeds of the power input shaft and the power output shaft of the clutch coincide. And when these two rotational speeds are matched, and ends this control, it controls the clutch Chis stroke completely connected state. The target rotation angular velocity of the engine corresponding to the access Lupe Dar operation amount can be configured to calculate by using the control map.

That is, the present invention uses the information including the accelerator pedal operation amount (A), the engine rotation speed (Ne), the clutch rotation speed (Nc), the vehicle speed (v), and the clutch stroke (S) as input information, and the clutch operation amount. Is output information corresponding to the input accelerator pedal operation amount (A), the clutch stroke (S) as output information is set as a function (f (t)) of the elapsed time (t). Clutch stroke (S) is maintained when the first map is maintained and the vehicle speed (v) is less than a predetermined value and the input accelerator pedal operation amount (A) exceeds the set value (A1) and the clutch shifts to a slipping state. Feed-forward control means for controlling the vehicle according to the first map, and the time corresponding to the accelerator pedal operation amount (A) inputted by the vehicle acceleration (dV / dt) Holding the clutch stroke (S) to the value of the clutch stroke at that time when it reaches the target acceleration (alpha), that a feedback control means for performing fuel supply control to the engine so as to maintain the target acceleration It is characterized by.

It can be configured to hold the second map at the time the target acceleration (alpha) is set in advance in correspondence with the access Lupe Dar operation amount of the input (A). The clutch may be controlled to be engaged when the engine rotation speed (Ne) becomes equal to the clutch rotation speed (Nc). The target acceleration, longitudinal acceleration of the vehicle, the rotational angular acceleration of the drive wheels, the rotational angular acceleration of the transmission output shaft, is defined either by rotation angular acceleration of the transmission input shaft.

Clutch control apparatus of the present invention, in a state that the clutch slips during acceleration of the vehicle, even if the corresponding to the bonding degree of the clutch rotational speed of the engine is reduced, access Lupe Dal operated by the driver with the amount of operation the engine rotational speed to the target engine rotational angular velocity determined according to the control, clutch lactis stroke is a movement in the tangential direction by the feed forward control, repeat the holding by acceleration feedback, it does not move in the cross direction Therefore, it is possible to avoid a state in which the control repeats unnecessary vibrations. Thus, at the start of the vehicle, at a very low speed running, or even at the time of reverse travel, without requiring the operation of the clutch pedal, to provide a clutch control device capable of controlling smooth clutch control and engine rotational speed be able to. In the vehicle to which the present invention, it is possible to eliminate the clutch pedal of the driver's seat.

Example 1
The apparatus according to the embodiment of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a block diagram of an apparatus according to an embodiment of the present invention. This is a large vehicle and the present invention is applied to a cargo vehicle equipped with a diesel engine. A clutch 2 is connected to the power output shaft of the engine 1, a transmission 3 is connected to the output shaft of the clutch 2, and the output shaft of the transmission 3 is a propeller shaft 5 for transmitting rotational power to the axle.

The clutch 2 is constituted by a dry mechanical clutch. Mechanical opening and closing control of the clutch 2 is carried out by clad private parts Suta 6. Is to cladding pubic Suta 6 have air is sent as a driving energy, the opening and closing operation of the air pressure is executed by the hydraulic pressure supplied from clutch thia actuator 8. The cladding thia actuators 8 are controlled by an electrical signal.

  The transmission 3 is a well-known device constituted by a gear combination of seven forward speeds and one reverse speed, and the gear switching of the transmission 3 is mechanically controlled by a transmission control device 4. The transmission control device 4 is supplied with the air pressure of the vehicle as a power source for the switching control. A plurality of pneumatic cylinders (not shown) that are operated by the air pressure are provided inside the speed change control device 4, and an on-off valve for supplying air pressure to the pneumatic cylinder is controlled by an electric signal.

Electrical signal supplied to the shift control device 4 and the cladding thia actuator 8, the shift control circuit 11 is generated. The shift control circuit 11 is a logic circuit including a program control circuit. The control logic of the clutch control device of the present invention is implemented as software in the program control circuit and is executed by an output electric signal generated by the shift control circuit 11.

  A fuel pump 13 that supplies fuel to the engine 1 is controlled by an engine control circuit 12. The engine control circuit 12 is also a program control circuit. The engine control circuit 12 and the shift control circuit 11 are connected by a communication bus 14 and are configured to share information with each other. This configuration is also a well-known configuration.

Via an input interferons chair to shift control circuit 11 (I / O), access operation amount of Lupe Dal 9 (A), the engine rotational speed from the rotation sensor provided in the engine 1 (Ne), the output of the clutch 2 clutch rotational speed from the rotation sensor provided in the shaft (Nc), the vehicle speed from the rotation sensor provided in the propeller shaft 5 (v), and cladding Chis Torrox cladding Chis stroke (S) of the electrical signal from the habit capacitors 7 As input information. Then, the shift control circuit 11 sends out the clutch operation amount (target value S ₀ or change value ± ΔSc) as control output information according to the present invention.

In the shift control circuit 11, a first map illustrated in FIG. 2 is set as a control map. This map is illustrated as a graph for easy understanding, but the contents implemented in the practical shift control circuit 11 are numerical data or a function expression. The first map is, the elapsed time on the horizontal axis represents (t), clutch the vertical axis the output information Chis stroke takes (S), in response to access Lupe Dar operation amount (A) to be input, A number of curves as a function of time S = f (t)
Is a three-dimensional map on which is drawn. In FIG. 2, since the drawing becomes complicated, a large number of curves are representatively displayed by three solid lines and three broken lines.

Further, a second map exemplified in FIG. 3 is set in the shift control circuit 11 as a control map. The second map is a Accessible Lupe Dar operation amount abscissa is given as input information (A), a vertical axis is the output information eye ShimegiKa rate (alpha). Although the second map is also described here as a graph, the map implemented in the shift control circuit 11 is numerical data or a function expression. That is, the present invention is primarily vehicle is intended to be utilized when it is accelerated by the half-clutch state, the operation amount of access Lupe Dar a driver's operation input in this case (A), 3 it is an eye ShimegiKa speed uniquely made to correspond to the second map.

Next, the operation of such an apparatus will be described. Figure 4 takes the passage of time on the horizontal axis in common, the vertical axis, and displays the a control output clutch Chis stroke of the inventive device (S), in correspondence, the output shaft rotational speed of the engine and clutch (Ne , Nc) and vehicle acceleration are displayed in parallel.

Now, it is assumed that the driver starts the operation of starting traveling from the stop state of the vehicle. That is, it is assumed that the driver sets the shift lever to the drive position. The shift control circuit 11 autonomously detects this and sets the transmission 3 to the second forward stage. Furthermore, the driver, remove the Perkin being in attendance on the rake, it is assumed that the depressed slowly the access Lupe Dar. Referring to FIG. 4, access Lupe Dar operation amount at time t ₁ the horizontal axis is assumed to become A ₁ shown in FIG. Thus the control of the clutch Chis stroke (S) is started, the transition from the state of clutch disconnection in the clutch slips. The control device of the present invention for cladding Chis stroke (S), performing the feedback control by feedforward and target acceleration according to the map shown in FIGS.

When the clutch slips, the engine output torque is transmitted to the clutch output side, and the rotational speed (Nc) of the clutch output shaft gradually increases as shown in FIG. At this time, the engine speed (Ne) is automatically controlled by the engine control circuit so as to be a rotational angular speed determined by the accelerator opening. At this time in response to access Lupe Dar operation amount inputted by operation of the driver (A), it is selected one of the curve shown in FIG. 2, in accordance with the curve (S = f (t)) , the time cladding Chis stroke (S) is controlled in the contact direction corresponding to the.

Over time in this state, and to have reached the value of the target acceleration of FIG. 3 in response to vehicle acceleration Accessible Le pedal operation amount at time t ₂ in FIG. 4 (A). Then, clutch Chis stroke (S) as shown in Figure 4 maintains its value is controlled so as not to change the additional clutch stroke (S). At the same time, the engine control circuit 12 supplies fuel to the engine so that the target rotational angular velocity determined by the accelerator opening maintains that value.

With the passage of further time, at time t ₃ when 4, the rotational speed of the clutch output shaft (Nc) is equal to the engine rotational speed (Ne), that is in a state where the slip of the clutch is exhausted, cladding Chis stroke ( S) is further controlled in the “contact” direction. And in this time t _3, and terminates the feedforward control and feedback control according to the present invention, to return the clutch Chis stroke to Kanse' position. By performing such control, in a state where the clutch is slipping, it is possible to control the engine output and cladding Chis stroke is related to each other, to avoid a situation where smooth control impossible.

  FIG. 5 is a flowchart showing the main part of the apparatus according to the present invention. Since this can be understood from the above description of the operation, the description is not repeated here.

(Example 2)
In the first embodiment, the first map and the second map have been described as having one type, but a plurality of these two maps are prepared and selectively used according to other parameters. Can be configured to. In particular, a plurality of maps corresponding to combinations of transmission gears (including reverse gears) can be prepared and used selectively according to the gear combination set at that time. .

  In the above embodiment, the large freight vehicle in which the present invention is implemented has been described for the time being. However, this does not limit the vehicle type, and its applicability is extremely wide.

The block block diagram of this invention Example apparatus. The figure explaining the 1st map set to this invention Example apparatus. The figure explaining the 2nd map set to this invention Example apparatus. The time chart explaining operation | movement of this invention Example apparatus. The flowchart explaining operation | movement of this invention Example apparatus.

DESCRIPTION OF SYMBOLS 1 Engine 2 Clutch 3 Transmission 4 Shift control device 5 Propeller shaft 6 Clutch booster 7 Clutch stroke sensor 8 Clutch actuator 9 Accelerator pedal 11 Shift control circuit 12 Engine control circuit 13 Fuel pump 14 Communication bus

Claims (4)

Information including the accelerator pedal operation amount (A), engine rotation speed (Ne), clutch rotation speed (Nc), vehicle speed (v), and clutch stroke (S) is input information, and the clutch operation amount is output information. In the clutch control device,
A first map in which the clutch stroke (S), which is output information corresponding to the input accelerator pedal operation amount (A), is set as a function (f (t)) of the elapsed time (t) is held, and the vehicle speed ( When v) is less than a predetermined value and the input accelerator pedal operation amount (A) exceeds the set value (A1) and the clutch shifts to a slipping state, the clutch stroke (S) is controlled according to the first map. Feedforward control means;
When the vehicle acceleration (dV / dt) reaches the current target acceleration (α) corresponding to the input accelerator pedal operation amount (A), the clutch stroke (S) is held at the current clutch stroke value. And a feedback control means for controlling fuel supply to the engine so as to maintain the target acceleration . Input to access Lupe Dal operation amount corresponding to (A) and at that time the target acceleration (alpha) is a clutch control device according to claim 1, wherein for holding the second map set in advance.   The clutch control device according to claim 1, further comprising means for controlling the clutch to a connected state when the engine rotational speed (Ne) becomes equal to the clutch rotational speed (Nc). The target acceleration, longitudinal acceleration of the vehicle, the rotational angular acceleration of the drive wheels, the rotational angular acceleration of the transmission output shaft, the clutch according to claim 1 wherein is defined either by rotation angular acceleration of the transmission input shaft Control device.

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