JP2008202546A - Operation control device and operation control method for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation control device and an operation control method for a vehicle, preventing abrupt increase in engine speed, so-called occurrence of racing of an engine, when no-load state of an engine occurs caused by charge of working oil in a switching period from release to engagement of clutch, and preventing occurrence of a problem such as induction of abrasion or seizing of a sliding part caused by the racing. <P>SOLUTION: A vehicle has a vehicle controller controlling and operating a transmission based on a clutch control signal from a clutch release/connection signal oscillation means, and an engine controller. In the vehicle, clutch release time elapse from oscillation of a clutch release signal by the clutch release/connection signal oscillation means to the next connection of the clutch is measured by a timer, and a drop time of an engine speed corresponding to the clutch release time, and the engine speed in the calculated engine speed drop time are calculated based on the clutch release time signal from the timer, and the engine is operated at the calculated engine speed during an engine speed drop time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The invention controls a vehicle controller that controls and operates a transmission based on a clutch control signal from a clutch release and connection signal oscillating means, and controls an engine based on a vehicle operation signal from the vehicle controller and an engine operation signal from an accelerator pedal. The present invention relates to an operation control device for a vehicle including an engine controller to be operated and an operation control method for a vehicle.

FIG. 4 is a configuration diagram of a power transmission system mainly applied to an industrial vehicle such as a forklift.
In FIG. 4, a torque converter 29 is connected to a crankshaft (not shown) of the engine 5, and the power of the engine 5 is transmitted to the transmission 4 via the torque converter 29. The power is transmitted by the output mechanism 28 to the wheels 27 after being shifted by the forward clutch 23, the reverse clutch 22 and the transmission gear 26 in the transmission. A control valve 21 controls the switching of the clutch 23 or 22 and is attached to the upper part of the transmission case 24.

FIG. 3 is a schematic configuration diagram of a vehicle operation control system provided with the power transmission system as shown in FIG.
In FIG. 3, a vehicle speed detection signal from a vehicle speed sensor 6 is supplied to a vehicle controller 1 that controls and operates the transmission ratio and clutch release and connection of the transmission 4, and an F / N / R (forward / neutral / reverse) switching lever. A clutch control signal which is a clutch release / connection signal is input from the clutch release / connection signal oscillation means 7. The vehicle controller 1 controls and operates the transmission 4 based on the vehicle speed detection signal and the clutch control signal, and inputs a vehicle operation signal to the engine controller 2.
The engine controller 2 controls and operates the engine 5 based on a vehicle operation signal, an engine operation signal input from the accelerator pedal 3 and an engine speed signal fed back from the engine 5.

  In Patent Document 1 (Japanese Patent Laid-Open No. 5-306752), in an automatic transmission, when the input rotational speed of the transmission decreases by a predetermined value, when a predetermined time elapses from a shift determination or a shift command, There has been disclosed a transmission configured to output a signal for increasing the transmission hydraulic pressure and to supplement a decrease in the transmission hydraulic pressure.

JP-A-5-306752

In the automatic transmission 4 for a vehicle having a power transmission system as shown in FIG. 4, the transmission 4 includes a clutch such as a vehicle speed detection signal from the vehicle speed sensor 6 and an F / N / R (forward / neutral / reverse) switching lever. The automatic shift is performed by the shift control signal from the vehicle controller 1 to which the clutch control signal is input from the release / connection signal oscillation means 7.
On the other hand, the output torque and engine speed of the engine 5 are determined by the amount of depression of the accelerator pedal.

However, in the automatic transmission 4, when the automatic transmission is performed, for example, when shifting from the first speed to the second speed, the hydraulic pressure of the first speed clutch is released and the hydraulic pressure is supplied to the second speed clutch. At this time, the oil passage and the clutch chamber on the side of the second-speed clutch that have been released must be filled with hydraulic oil, and it takes time to fill the hydraulic oil, so the hydraulic pressure of the second-speed clutch rises. It will take time.
Therefore, during the period from the release of the first speed clutch to the connection of the second speed clutch, neither the first speed clutch nor the second speed clutch is engaged in the automatic transmission 4, and no clutch hydraulic pressure is established. A state where the two are not engaged occurs.

  In the automatic transmission 4, when the clutch is not engaged as described above, if the engine is in an acceleration state with the accelerator pedal depressed, the number of revolutions rapidly increases without load for the engine 5. When an overspeed condition occurs, so-called engine blow-up condition occurs, especially when engine blow-up occurs immediately after start-up, the engine speed rapidly rises in a state of insufficient lubrication, which induces wear and seizure of sliding parts such as bearings. To do.

On the other hand, in the transmission 4, as shown in FIG. 4, the clutch 23 or 22 is connected to the internal forward clutch 23 or the reverse clutch 22 by supplying the hydraulic oil via the control valve 21, or the hydraulic oil is connected. The clutch 23 or 22 is disengaged by discharging the oil, and the speed change operation is performed. However, the discharged oil (operating oil) from the released clutch 23 or 22 is drained into the transmission case 25.
However, in the transmission 4, the control valve 21 is arranged on the upper part or the side part of the transmission case 25 as shown in FIG. Even if the operation oil is released and the hydraulic oil is drained, the hydraulic oil remains without being discharged from the control valve 21 to the hydraulic oil passage of the clutch 23 or 22 immediately after the clutch is switched.

This residual oil leaks over time from the seal valve or the piston seal gap provided in the hydraulic oil passage of the clutch 23 or 22 from the control valve 21, thereby causing a gap between the control valve 21 and the clutch 23 or 22. The amount of hydraulic oil that accumulates in the oil passage and should be prepared for the next clutch engagement decreases with time. The degree of decrease in the oil amount depends on the time from when the engagement of a certain clutch is released until the next clutch is engaged.
Next, when hydraulic oil is supplied from the control valve 21 side to the clutch 23 or 22 released by the shift, the time for filling the hydraulic oil from the control valve 21 to the clutch 23 or 22 remains when the clutch is released. It depends on the amount of residual hydraulic oil.

Therefore, in the transmission 4, the amount of the remaining hydraulic oil is determined by the time when the clutch 23 or 22 is disengaged, and the hydraulic oil filling time when the clutch 23 or 22 is engaged, that is, the shift time. Will be decided.
That is, if the clutch 4 is moved from N (neutral) to F (forward), for example, after the transmission 4 is left unattended for a long time, the hydraulic fluid filling period and the shift time of the clutch become longer, and the second and subsequent times. In the switching, the hydraulic oil filling period and the shift time are shortened.
As described above, when the automatic shift is performed by switching the clutch 23 or 22 from the state of being left for a long time, as described above, the hydraulic oil filling period becomes long and the shift time becomes long. A state in which the clutch is released occurs, the engine load is eliminated, and the so-called engine blow-up, in which the engine rotational speed rapidly increases as described above, occurs.

  SUMMARY OF THE INVENTION In view of the problems of the prior art, the present invention provides a rapid increase in the engine speed when a no-load state of the engine occurs due to the filling of hydraulic oil during the switching period from release of the clutch to engagement, so-called occurrence of engine blow-up and An object of the present invention is to provide a vehicle operation control apparatus and operation control method that prevent the occurrence of problems such as wear of sliding parts and induction of seizure.

  The present invention achieves such an object by controlling the transmission based on the clutch release of the transmission clutch, the clutch release for outputting the connection signal, the connection signal oscillating means, and the clutch control signal from the clutch release and connection signal oscillating means. In the vehicle operation control device, comprising: a vehicle controller to be operated; and an engine controller for controlling and operating the engine based on a vehicle operation signal from the vehicle controller and an engine operation signal from an accelerator pedal; An engine corresponding to the clutch release time input from the timer is provided in the vehicle controller, and includes a timer for measuring the passage of the clutch release time from when the clutch release signal is oscillated by the oscillation means until the next clutch is connected. Rotational speed Engine speed reduction time calculating means for calculating a lower time is provided, the engine controller calculates an engine speed at the engine speed reduction time calculated by the engine speed reduction time calculation means, and the engine speed reduction An engine speed control means for operating the engine at the calculated engine speed during the time is provided.

In this invention, the following configuration is preferable.
That is, the vehicle controller determines a change in the clutch release time from when the clutch release signal is oscillated by the clutch release / connection signal oscillating means until the next clutch is connected, and the engine speed corresponding to the clutch release time change. A clutch release time / engine speed reduction time setting means set in a map, and the engine speed reduction time calculation means is an engine speed reduction time corresponding to the clutch release time input from the timer. Is extracted from the clutch release time / engine speed reduction time setting means.

Further, the invention of a method for driving and controlling a vehicle having the vehicle driving control device having the above-described configuration,
Clutch release of transmission clutch, clutch release for outputting connection signal, connection signal oscillating means, vehicle controller for controlling and operating transmission based on clutch control signal from clutch release and connection signal oscillating means, and from the vehicle controller A vehicle operation control method comprising an engine controller for controlling and operating an engine based on a vehicle operation signal and an engine operation signal from an accelerator pedal, wherein a clutch release signal is oscillated by the clutch release and connection signal oscillating means. The elapsed time until the next clutch is engaged is counted using a timer, and the engine speed reduction time corresponding to the clutch release time is calculated based on the clutch release time signal measured by the timer. This calculated engine speed It calculates the engine rotational speed in the drop time, characterized by operating the engine with the calculated engine speed in the engine rotational speed decrease time.

  According to the present invention, the lapse of the clutch release time from when the clutch release signal is oscillated until the next clutch is connected is timed by the timer and continuously input to the vehicle controller. The engine release speed change time corresponding to the release time change and the clutch release time change, that is, the time for reducing the engine speed to an appropriate speed at no load is mapped to the clutch release time / engine speed reduction time setting means. The engine release speed reduction time corresponding to the passage of the clutch release time inputted from the timer (that is, the time for reducing the engine speed to an appropriate rotation speed at no load as described above) is released from the clutch. Extracted from the time / engine speed reduction time setting means, the engine speed reduction time is extracted from the engine controller. By entering the duration of the engine rotational speed decrease time in the engine controller, it is possible to operate the engine by controlling the engine speed to the proper speed during no load.

Therefore, according to the present invention, during the clutch release time from when the clutch release signal is oscillated until the next clutch is connected, the period of the engine speed reduction time set corresponding to the clutch release time, The engine speed of the engine can be operated at an appropriate speed when there is no load, and it is possible to reliably prevent the occurrence of an overspeed state in which the engine speed rapidly increases when there is no load during the clutch release time, so-called engine blow-up. Can do.
As a result, it is possible to prevent wear and seizure of sliding parts such as bearings due to the occurrence of engine blow-up in the state of insufficient lubrication such as immediately after starting, and to realize safe operation of the engine.
In addition, when the engine speed reduction time corresponding to the clutch release time has elapsed and the clutch is connected, and the engine no-load state associated with the clutch release is released, normal load control is quickly performed without causing a time lag. Can be migrated to.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

FIG. 3 is a schematic configuration diagram of a vehicle operation control system to which the present invention is applied.
In FIG. 3, a vehicle speed detection signal from a vehicle speed sensor 6 is supplied to a vehicle controller 1 that controls and operates the transmission ratio and clutch release and connection of the transmission 4, and an F / N / R (forward / neutral / reverse) switching lever. A clutch control signal which is a clutch release / connection signal is input from the clutch release / connection signal oscillation means 7. The vehicle controller 1 controls and operates the transmission 4 based on the vehicle speed detection signal and the clutch control signal, and inputs a vehicle operation signal to the engine controller 2.
The engine controller 2 controls and operates the engine 5 based on a vehicle operation signal, an engine operation signal input from the accelerator pedal 3 and an engine speed signal fed back from the engine 5.

The present invention relates to prevention of engine overspeed in the vehicle operation control system configured as described above.
FIG. 1 is a control block diagram of a vehicle operation control system according to an embodiment of the present invention.
In FIG. 1, a timer 13 is connected to the vehicle controller 1 to release a clutch comprising an F / N / R (forward / neutral / reverse) switching lever or the like, and a clutch 23 or 22 (see FIG. 4) is oscillated, and when the clutch release signal is input to the timer 13 connected to the vehicle controller 1, the timer 13 starts timing and releases the clutch from the clutch release time point. The time signal is continuously input to the engine speed reduction time calculation means 11 of the vehicle controller 1.

The vehicle controller 1 includes a clutch release time / engine speed reduction time setting means 12, and the clutch release time / engine speed reduction time setting means 12 includes the clutch release time as shown in FIG. The clutch release time T1, which is a change in the clutch release time from when the clutch release signal is oscillated by the connection signal oscillation means 7 until the next clutch is connected, and the decrease in the engine speed corresponding to the clutch release time T1 The time T2, that is, the time T2 during which the engine speed is reduced to an appropriate speed when there is no load when the clutch is released, is obtained by experimental results or simulation calculation, and is set in a map.
In FIG. 2, after the clutch release signal is oscillated, the engine revolution speed reduction time T2 increases in proportion to the clutch release time T1 until Z time when the next clutch is engaged.

In the engine speed reduction time calculating means 11, the engine speed reduction time corresponding to the clutch release time T1 continuously input from the timer 13 (the time for reducing the engine speed to an appropriate speed at no load). ) T2 is extracted from the clutch release time / engine speed reduction time setting means, and this engine speed reduction time signal T2 is input to the engine speed control means 21 of the engine controller 2.
The engine speed control means 21 controls the engine 5 during the clutch release time T1 so that the engine speed becomes an appropriate speed when there is no load.
As described above, the engine 5 is stably operated at an appropriate rotational speed during no-load operation during no-load operation during the clutch release time T1, and no overload, that is, engine blow-up, does not occur. .

  According to the above embodiment, the clutch release time elapsed from when the clutch release signal is oscillated by the clutch release / connection signal oscillating means 7 until the next clutch is connected is counted by the timer 13 and continuously transmitted to the vehicle controller 1. In the vehicle controller 1, the clutch release time change T1 and the engine speed reduction time T2 corresponding to the clutch release time change T1, that is, the time to reduce the engine speed to an appropriate speed at no load are set. The clutch release time / engine speed reduction time setting means 12 is set in a map form, and the engine speed reduction time corresponding to the clutch release time T1 input from the timer 13 (that is, as described above, the engine speed). To reduce the engine speed to an appropriate speed when there is no load) T2 is the clutch release time / engine speed reduction time setting By extracting from the stage 12 and inputting this engine speed reduction time T2 to the engine controller 2, the engine speed is set to an appropriate speed at no load in the engine controller 2 during the engine speed reduction time T2. It becomes possible to control and operate the engine 5.

Therefore, according to this embodiment, during the clutch release time T1 from when the clutch release signal is oscillated until the next clutch is connected, the engine speed reduction time set corresponding to the clutch release time T1 is set. During the period T2, the engine speed of the engine 5 can be operated at an appropriate speed at the time of no load, and an overspeed state in which the engine speed rapidly rises at the time of no load during the clutch release time T1, so-called engine blow-up occurs. Can be reliably prevented.
Thereby, it is possible to prevent wear of sliding parts such as bearings and induction of seizure due to the occurrence of engine blow-up particularly in a state of insufficient lubrication such as immediately after starting, and to realize safe operation of the engine 5.
When the engine speed reduction time T2 corresponding to the clutch release time T1 has elapsed and the clutch 23 or 22 (see FIG. 4) is connected, and the no-load state of the engine 5 associated with the clutch release is released, It is possible to quickly shift to normal load control without causing a time lag.

  According to the present invention, a sudden increase in engine speed at the time of occurrence of a no-load state of the engine accompanying the filling of hydraulic oil during the switching period from release of the clutch to engagement, so-called occurrence of engine blow-up, and sliding portion caused thereby It is possible to provide an operation control device and an operation control method for a vehicle that prevent the occurrence of problems such as wear and seizure.

1 is a control block diagram of a vehicle operation control system according to an embodiment of the present invention. FIG. 4 is a relationship diagram between a clutch release time and an engine speed reduction time in the embodiment. 1 is a schematic configuration diagram of a driving control system for a vehicle to which the present invention is applied. It is a block diagram of the power transmission system mainly applied to industrial vehicles, such as a forklift.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle controller 2 Engine controller 3 Accelerator pedal 4 Transmission 5 Engine 6 Vehicle speed sensor 7 Clutch release, connection signal oscillation means 11 Engine rotation speed reduction time calculation means 12 Clutch release time / engine rotation speed reduction time setting means 13 Timer 21 Engine rotation speed Control means 22, 23 Clutch

Claims (3)

  Clutch release of transmission clutch, clutch release for outputting connection signal, connection signal oscillating means, vehicle controller for controlling and operating transmission based on clutch control signal from clutch release and connection signal oscillating means, and from the vehicle controller In the vehicle operation control device having an engine controller for controlling and operating the engine based on the vehicle operation signal and the engine operation signal from the accelerator pedal, the clutch release signal is oscillated by the clutch release and connection signal oscillation means. An engine speed for providing a timer for measuring the elapsed time of the clutch release until the next clutch is connected, and calculating a decrease time of the engine speed corresponding to the clutch release time input from the timer in the vehicle controller Decline The engine controller calculates an engine speed at the engine speed reduction time calculated by the engine speed reduction time calculation means, and calculates the engine speed at the calculated engine speed during the engine speed reduction time. An operation control device for a vehicle, comprising engine speed control means for operating the engine.   The vehicle controller is configured to change the clutch release time from when the clutch release signal is oscillated by the clutch release / connection signal oscillating means until the next clutch is connected, and to decrease the engine speed corresponding to the clutch release time change. A clutch release time / engine speed reduction time setting means having a time set as a map; and the engine speed reduction time calculation means sets the engine speed reduction time corresponding to the clutch release time input from the timer. 2. The vehicle operation control device according to claim 1, wherein the vehicle operation control device is configured to extract from a clutch release time / engine speed reduction time setting means.   Clutch release of transmission clutch, clutch release for outputting connection signal, connection signal oscillating means, vehicle controller for controlling and operating transmission based on clutch control signal from clutch release and connection signal oscillating means, and from the vehicle controller A vehicle operation control method comprising an engine controller for controlling and operating an engine based on a vehicle operation signal and an engine operation signal from an accelerator pedal, wherein a clutch release signal is oscillated by the clutch release and connection signal oscillating means. The elapsed time until the next clutch is engaged is counted using a timer, and the engine speed reduction time corresponding to the clutch release time is calculated based on the clutch release time signal measured by the timer. This calculated engine speed Calculates the engine rotational speed in the drop time, the operation control method for a vehicle, which comprises operating the engine with the calculated engine speed in the engine rotational speed decrease time.

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