JP2010274831A - Internal combustion engine and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine and a control method thereof which can efficiently recover braking energy and achieve fuel saving running. <P>SOLUTION: A regenerative braking system 10 is disposed between a transmission 4 and driving wheels 8 in a place that does not interfere with the gear rotation synchronization at shifting gears. When both a clutch pedal 23 and an accelerator pedal 21 are off, a clutch device 3 is automatically cut off, and regenerative braking is performed by a regenerative braking system 10a. When a brake pedal 22 is on when the clutch pedal 23 is on or just before that, the regenerative braking is turned on by the regenerative braking system 10. When the accelerator pedal 21 is on when the clutch pedal 23 is on or just before that, the regenerative braking is turned off. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an internal combustion engine and a control method therefor, and more particularly, to an internal combustion engine that can efficiently recover braking energy and realize fuel-saving travel and a control method therefor.

  In a regenerative braking system for an internal combustion engine, braking energy discarded as brake heat or the like is converted into electric power by a generator, a condenser, etc., and stored (recovered) in a battery, and the electric energy is used for auxiliary driving or traveling driving. It is a system to use.

  Regenerative braking is performed when the vehicle is decelerated, but by disconnecting the engine and drive wheels during regenerative braking, the regenerative braking can be increased in order to maintain the same deceleration by eliminating the engine brake. The amount of braking energy recovered can be increased (see, for example, Patent Document 1).

  FIG. 4 shows an arrangement example of the regenerative braking device 51 (51a to 51f) of the conventional vehicle 50. When the regenerative braking device 51 is disposed at any position as indicated by the regenerative braking devices 51a to 51c as in the conventional vehicle 50, that is, closer to the engine body 53 than the clutch device 52, the clutch device 52 is turned off and the engine is turned off. When the connection with the drive wheel is cut off, the regenerative braking device 51 disposed in any of the regenerative braking devices 51a to 51c is also disconnected, so that regenerative braking cannot be performed.

  Therefore, when the regenerative braking device 51 is disposed either in the transmission 54 or in a PTO (Power Take Off) position of the transmission 54 as indicated by the regenerative braking devices 51d to 51f, the regenerative braking is performed even if the clutch device 52 is disconnected. And the amount of energy recovered can be increased. However, the arrangement of the regenerative braking devices 51d to 51f at any of these positions interferes with the rotation synchronization of the gears of the transmission 54 at the time of shifting (shifting up or down). Therefore, it is necessary to perform the rotation synchronous control 51 and the separation for reducing the inertia weight, and the entire structure becomes complicated and the control becomes difficult.

  In an automatic control type manual transmission (AMT), there is an example in which regeneration is performed without shifting (that is, with the gear stage fixed) in order to obtain a regenerative amount efficiently, but shift time is required at the time of reacceleration, etc. This will adversely affect fuel consumption, such as increasing the amount of accelerator depression.

  Therefore, in an internal combustion engine having a regenerative braking device, an important issue is how to achieve fuel-saving travel while efficiently recovering braking energy.

Japanese Patent Laid-Open No. 10-100731

  An object of the present invention is to provide an internal combustion engine capable of efficiently recovering braking energy and realizing fuel-saving travel and a control method thereof.

  In order to achieve the above object, an internal combustion engine of the present invention includes a clutch device for connecting / disconnecting an internal combustion engine body and a transmission, a clutch pedal for operating connection / disconnection by the clutch device, and a connection / disconnection by the clutch device. In an internal combustion engine having automatic clutch operating means that automatically performs the operation independently of the operation of the clutch pedal and a regenerative braking device disposed between the transmission and the drive wheel, the clutch pedal and the accelerator pedal When both are off, the connection between the internal combustion engine body and the transmission is automatically disconnected by the automatic clutch operating means, regenerative braking is turned on by the regenerative braking device, and the clutch pedal is turned on. Or just before that, when the brake pedal is on, regenerative braking is turned on by the regenerative braking device, and when the clutch pedal is on or off. Just before, when the accelerator pedal is on, and has a control unit for turning off the regenerative braking.

  In the internal combustion engine, the control unit turns on regenerative braking by the regenerative braking device when the clutch pedal is on or immediately before it and when the brake pedal and accelerator pedal are off. is there.

  Further, the control method of the internal combustion engine of the present invention for achieving the above object includes a clutch device for connecting / disconnecting the internal combustion engine body and the transmission, a clutch pedal for operating the connection / disconnection by the clutch device, A control method for an internal combustion engine, comprising: automatic clutch operation means for automatically performing connection / disconnection by a clutch device independently of operation of the clutch pedal; and a regenerative braking device disposed between the transmission and a drive wheel. When both the clutch pedal and the accelerator pedal are off, the connection between the internal combustion engine body and the transmission is automatically disconnected by the automatic clutch operating means, and regenerative braking is turned on by the regenerative braking device. When the clutch pedal is on or just before it, and when the brake pedal is on, regenerative braking is turned on by the regenerative braking device, and the clutch is Pedal when on or immediately before, when the accelerator pedal is on, is to turn off the regenerative braking.

  In the control method for an internal combustion engine, the regenerative braking device turns on the regenerative braking when the clutch pedal is on or immediately before the brake pedal and the accelerator pedal are off.

  According to the present invention, braking energy can be efficiently recovered by regenerative braking at the time of braking, and fuel-saving travel can be realized by repulsive driving without clutch regenerative braking at the time of acceleration or cruising.

It is a principal part block diagram of the vehicle of embodiment of this invention. It is a principal part block diagram of the electric system of the vehicle of FIG. It is a figure showing the on-off state of the regenerative braking in each of operation states AD. It is a partial block diagram of the conventional vehicle.

  Hereinafter, an internal combustion engine and a control method thereof according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a main part of a vehicle (internal combustion engine) 1 according to the present embodiment.

  The engine main body (internal combustion engine main body) 2 of the vehicle 1 uses a piston in the cylinder by expansion based on self-ignition that occurs when, for example, fuel is supplied to air that has been compressed and heated to high temperature in a cylinder (combustion chamber). It is a diesel engine having a configuration for extruding. In addition, this invention is not limited to a diesel engine, It can also apply to a gasoline engine etc.

  A clutch device 3, a transmission 4, a propeller shaft 5, a differential gear 6, a drive shaft 7, and a drive wheel 8 are sequentially installed on the rear stage of the engine body 2. Reference numerals 9a to 9d are speed reducers.

  The clutch device 3 is a device that mechanically connects and disconnects the engine body 2 and the transmission 4. The connection / disconnection operation by the clutch device 3 is performed not only by the operation of the clutch pedal by the operator but also automatically by the automatic clutch operation device (automatic clutch operation means) independently of the operation of the clutch pedal. Yes.

  For the transmission 4, a manual transmission (MT) or an automatically controlled manual transmission (AMT) is used. In the automatic control type manual transmission, the clutch device 3 and the gear box itself have the same structure as the manual transmission. By using an automatically controlled manual transmission, not only clutch operation but also gear shifting operation can be performed automatically.

  The regenerative braking device 10 (10a to 10f) is a device that is used for braking for deceleration and stop of the vehicle 1 and converts braking energy generated during braking of the vehicle 1 into electric power.

  In the vehicle 1 according to the present embodiment, the regenerative braking device 10 is located between the transmission 4 and the drive wheels 8 as shown by hatching in FIG. Is located in no position. Thereby, without complicating the whole structure and without making control difficult, regenerative braking can be performed by disengaging the clutch, and the amount of energy recovery can be increased. In FIG. 1, the positions where the regenerative braking device 10 is arranged are indicated by the regenerative braking devices 10 a to 10 e, but actually, at least one may be arranged. However, the regenerative braking device 10f may be arranged in one set (one for each wheel) from the viewpoint of ensuring the symmetry of both drive wheels 8.

  The regenerative braking devices 10 a, 10 b, and 10 c are disposed on the outer periphery of the propeller shaft 5 between the transmission 4 and the differential gear 6. The regenerative braking device 10a is disposed on the side close to the transmission 4 and in the vicinity of the speed reducer 9a. The regenerative braking device 10b is disposed between the transmission 4 and the differential gear 6 and in the vicinity of the speed reducer 9b. Furthermore, the regenerative braking device 10 c is arranged on the side close to the differential gear 6.

  In addition, the regenerative braking device 10 d is disposed on the side close to the transmission 4 and in the vicinity of the speed reducer 9 c at a position adjacent to the propeller shaft 5. Further, the regenerative braking device 10 e is disposed between the transmission 4 and the differential gear 6 and in the vicinity of the speed reducer 9 d at a position adjacent to the propeller shaft 5.

  Further, one set of the regenerative braking devices 10 f and 10 f is disposed on the outer periphery of the drive shaft 7 between the differential gear 6 and each of the two drive wheels 8.

  As such a regenerative braking device 10, a generator can be used, for example. However, the regenerative braking device 10 is not limited to a generator and can be variously changed, and a brake having a structure capable of converting braking energy into electric energy, such as an accumulator type or a flywheel, like a generator. Can also be used.

  Next, FIG. 2 shows a main part configuration diagram of the electric system of the vehicle 1 of FIG. In addition, a broken line shows wiring and the arrow has shown the direction through which an electric current flows. FIG. 2 shows an example in which the regenerative braking device 10 is arranged in the regenerative braking device 10a.

  The regenerative braking device 10a is electrically connected to the battery 17 through the inverter 15 and the connection switching device 16 in order. The inverter 15 is a circuit that converts the alternating current generated by the regenerative braking device 10a into a direct current. The connection switching device 16 is a device that performs electrical connection and disconnection between the regenerative braking device 10a and the battery 17 and electrical connection and disconnection between the battery 17 and the electrical accessory. The battery 17 is a device that is made of, for example, a lithium ion storage battery and stores electricity generated by the regenerative braking device 10a.

  Such a regenerative braking system having the regenerative braking device 10a, the inverter 15, the connection switching device 16 and the battery 17 converts braking energy discarded as brake heat or the like into electric power and accumulates (recovers) it in the battery 17. The electric energy is used for driving electric auxiliary equipment and driving the vehicle 1.

  The control system 20 controls, for example, the fuel injection amount of the fuel injection device of the engine body 2, the control of the amount of air supplied to the engine body 2, the automatic connection / disconnection control of the clutch device 3, the automatic transmission operation control of the transmission 4, and the regeneration. The entire electric control of the vehicle 1 such as circuit operation control of the braking system (inverter 15, connection switching device 16 and battery 17) is performed.

  Further, the control system 20 has a function as the above-described automatic clutch operating device. As the automatic connection / disconnection control of the clutch device 3, the clutch system 3 is operated even when the clutch pedal 23 is not depressed during regenerative braking. The apparatus 3 is automatically disconnected (that is, the connection between the engine body 2 and the transmission 4 is disconnected). As a result, regenerative braking can be increased in order to maintain the same deceleration as engine braking is eliminated, and the amount of braking energy recovered can be increased.

  Further, detection signals from sensors provided in the accelerator pedal 21, brake pedal 22, clutch pedal 23, and shift lever 24 are transmitted to the control system 20, and the control system 20 The various controls described above are performed based on the detection signal.

  An alternator 25 is installed near the front side of the engine body 2. The alternator 25 is a device that converts the rotational kinetic energy of the engine body 2 into an alternating current. The alternator 25 is electrically connected to the battery 26, and the electricity generated by the alternator 25 is charged in the battery 26. The battery 26 supplies a considerable amount of electric power to the electrical auxiliary equipment such as a lead storage battery.

  Next, an example of a control method (regenerative braking method) of the vehicle 1 according to the present embodiment will be described with reference to FIGS.

  FIG. 3 is a diagram showing the on / off state of regenerative braking in each of the operation states A to D. In each of the accelerator pedal 21, the brake pedal 22, and the clutch pedal 23, a state in which the accelerator pedal 21, the brake pedal 22, and the clutch pedal 23 are stepped on is referred to as on, and a state in which the accelerator pedal 21, brake pedal 22, and clutch pedal 23 are not depressed is referred to as off. This on / off is determined based on a detection signal transmitted from the sensor of each pedal to the control system 20.

  First, in the vehicle 1 of the present embodiment, when both the clutch pedal 23 and the accelerator pedal 21 in FIG. 2 are off, the clutch device 3 is automatically turned off by a command from the control system 20 to enter regenerative braking. The state is continued (regenerative braking is turned on). That is, regenerative braking is performed by the regenerative braking device 10a.

  On the other hand, when the clutch pedal 23 is on, as shown in FIG. 3, the control system 20 determines on / off of regenerative braking based on the operating states of the accelerator pedal 21 and the brake pedal 22 and instructs on / off of regenerative braking.

  That is, as shown in the operation states C and D, when the clutch pedal 23 is turned on or immediately before it, and when the brake pedal 22 is turned on, it is regarded as a speed change operation for changing the deceleration force, and regenerative braking is entered. The state is continued (regenerative braking is turned on). That is, regenerative braking is performed by the regenerative braking device 10.

  Further, as shown in the operation state C, when both the accelerator pedal 21 and the brake pedal 22 are turned off immediately before or after the clutch pedal 23 is turned on, it is regarded as a speed change operation for changing the deceleration force, and regeneration is performed. The brake is entered and the state is continued (regenerative braking is turned on). That is, regenerative braking is performed by the regenerative braking device 10.

  Further, as shown in the operation states A and B, when the clutch pedal 23 is turned on or immediately before it, and the accelerator pedal 21 is turned on, it is regarded as a speed change operation necessary for acceleration or cruising, and regenerative braking is prohibited. Or release (turn off regenerative braking).

  Here, the time immediately before the clutch pedal 23 is turned on is, for example, between 0 and 1 second when the clutch pedal 23 is depressed. Further, when the clutch pedal 23 is on, the clutch is forcibly disengaged. When the regenerative braking is on, the regenerative braking is performed with the clutch disengaged.

  As described above, according to the control method of the vehicle 1 of the present embodiment, braking energy can be efficiently recovered by regenerative braking during braking, and repulsive running without clutch is performed without regenerative braking during acceleration or cruising. This makes it possible to achieve fuel-saving travel.

  The internal combustion engine and its control method of the present invention can efficiently recover braking energy by regenerative braking during braking, and achieve fuel-saving travel by repulsive driving without clutching during reacceleration or cruising. Therefore, it can be used for an internal combustion engine such as an automobile and a control method thereof.

1 Vehicle (internal combustion engine)
2 Engine body (Internal combustion engine body)
3 Clutch device 4 Transmission 5 Propeller shaft 6 Differential gear 7 Drive shaft 8 Drive wheels 10, 10a to 10f Regenerative braking device 15 Inverter 16 Connection switching device 17 Battery 20 Control system (control unit)
21 Accelerator pedal 22 Brake pedal 23 Clutch pedal 24 Shift lever

Claims (4)

A clutch device for connecting / disconnecting the internal combustion engine body and the transmission, a clutch pedal for operating the connection / disconnection by the clutch device, and a connection / disconnection by the clutch device are automatically performed independently of the operation of the clutch pedal. In an internal combustion engine having automatic clutch operation means, and a regenerative braking device disposed between the transmission and the drive wheel,
When both the clutch pedal and the accelerator pedal are off, the connection between the internal combustion engine body and the transmission is automatically disconnected by the automatic clutch operating means, and regenerative braking is turned on by the regenerative braking device,
When the clutch pedal is on or just before it, and when the brake pedal is on, regenerative braking is turned on by the regenerative braking device,
An internal combustion engine having a controller that turns off regenerative braking when the clutch pedal is on or just before the accelerator pedal is on.   2. The internal combustion engine according to claim 1, wherein the control unit turns on regenerative braking by the regenerative braking device when the clutch pedal is on or immediately before, and when the brake pedal and the accelerator pedal are off. A clutch device for connecting / disconnecting the internal combustion engine body and the transmission, a clutch pedal for operating the connection / disconnection by the clutch device, and a connection / disconnection by the clutch device are automatically performed independently of the operation of the clutch pedal. In a control method for an internal combustion engine having automatic clutch operating means, and a regenerative braking device disposed between the transmission and a drive wheel,
When both the clutch pedal and the accelerator pedal are off, the connection between the internal combustion engine body and the transmission is automatically disconnected by the automatic clutch operating means, and regenerative braking is turned on by the regenerative braking device,
When the clutch pedal is on or just before it, and when the brake pedal is on, regenerative braking is turned on by the regenerative braking device,
A control method for an internal combustion engine in which regenerative braking is turned off when the clutch pedal is on or immediately before the accelerator pedal is on.   4. The control method for an internal combustion engine according to claim 3, wherein regenerative braking is turned on by the regenerative braking device when the clutch pedal is on or immediately before the brake pedal and the accelerator pedal are off.

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