JP2015113057A - Hybrid vehicle and reverse travel method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid vehicle and a reverse travel method therefor, which eliminate a reversing gear stage of a stepped transmission by controlling a reverse travel of a hybrid vehicle with a motor-generator controlled, thus enabling realization of a fuel economy improvement effect by reducing the weight of the vehicle.SOLUTION: A hybrid vehicle 1, in which power of an internal combustion engine 10 and that of a motor-generator 20 are transmitted to a wheel via a stepped transmission 30, includes a control device 40 for controlling a hybrid system 2, and the control device performs setting a gear stage Fgn of the stepped transmission 30 at a forward-travelling low-speed gear stage Fgi to cut off the transmission of the power of the internal combustion engine 10 to the stepped transmission 30, and reversing the motor-generator 20 to transmit the power thereof to the stepped transmission 30, when a shift lever of the stepped transmission 30 is moved to a reverse for a reverse travel, thus causing the hybrid vehicle 1 to travel in reverse. This eliminates a reverse-travelling gear stage from the stepped transmission 30.

Description

  The present invention eliminates the reverse gear of the stepped transmission by performing the reverse travel of the hybrid vehicle under the control of the motor generator, and can obtain the fuel efficiency improvement effect by reducing the weight of the hybrid vehicle. And a reverse traveling method.

  In a hybrid vehicle equipped with a hybrid system including an internal combustion engine, a motor generator, and a stepped transmission, and transmitting the power of the internal combustion engine and the power of the motor generator to the wheels via the stepped transmission, Similar to a vehicle that travels only with an internal combustion engine, during reverse travel, the reverse gear for reverse travel of the stepped transmission is used to travel backward.

  However, since the hybrid vehicle is equipped with a motor generator that can be easily reversed, the hybrid vehicle can be driven backward by rotating the motor generator in the reverse direction without using the reverse gear stage. Can do. For example, an electric motor reverse mode in which the transmission gear stage is set to the forward speed and the vehicle reverse travels by reverse rotation of the electric motor, and a transmission in which the transmission gear speed is set to the reverse speed and the vehicle reverse travel is performed. A vehicle capable of selecting the reverse mode has been proposed (see, for example, Patent Document 1).

  On the other hand, in a stepped transmission, by providing a reverse gear stage that is used only during reverse travel and is less frequently used, the overall length of the stepped transmission is increased and the number of parts is increased. The present inventors have obtained knowledge that, by eliminating the reverse gear stage, the stepped transmission can be reduced in size and weight, and as a result of this weight reduction, fuel efficiency in vehicle travel can be improved. .

JP 2013-91353 A

  The present invention has been made in view of the above, and its purpose is to perform the reverse travel of the hybrid vehicle by controlling the motor generator, omitting the reverse gear stage of the stepped transmission, An object of the present invention is to provide a hybrid vehicle capable of obtaining an effect of improving fuel consumption by reducing the weight of the hybrid vehicle, and a backward traveling method.

  In order to achieve the above object, a hybrid vehicle of the present invention is equipped with a hybrid system including an internal combustion engine, a motor generator, and a stepped transmission, and the power of the internal combustion engine via the stepped transmission. In the hybrid vehicle that transmits the power of the motor generator to wheels, when the control device that controls the hybrid system travels backward, the stepped gear shift is performed when the shift lever of the stepped transmission is operated backward. The gear stage of the machine is changed to a low-speed gear stage for forward travel, the transmission of the power of the internal combustion engine to the stepped transmission is interrupted, and the motor generator is rotated in reverse so that the power of the motor generator is increased. Is transmitted to the stepped transmission to control the hybrid vehicle to travel backward, and the stepped transmission is configured without a reverse gear.

  In addition, a hybrid vehicle control method of the present invention for achieving the above object includes a hybrid system including an internal combustion engine, a motor generator, and a stepped transmission, and the above-described step via the stepped transmission. In a reverse travel method of a hybrid vehicle in which the power of an internal combustion engine and the power of the motor generator are transmitted to wheels, the stepped transmission is configured without a reverse gear, and the stepped speed change is performed during reverse travel. When the shift lever of the machine is operated in reverse, the gear stage of the stepped transmission is changed to a low speed gear stage for forward travel, and the transmission of power of the internal combustion engine to the stepped transmission is cut off. The method includes reversely rotating the motor generator and transmitting the power of the motor generator to the stepped transmission to perform reverse travel of the hybrid vehicle.

  According to the hybrid vehicle and the reverse travel method of the present invention, the reverse gear stage (reverse gear stage) is not provided in the stepped transmission, so that the number of parts can be reduced, so that the cost can be reduced and the reverse gear stage. Only the portion where there is no gear can be reduced in weight, and the overall length of the stepped transmission is shortened, so that the stepped transmission can be reduced in size. As a result, the hybrid vehicle can be reduced in weight, and the fuel efficiency improvement effect can be obtained.

It is a figure which shows typically the structure of the hybrid vehicle of embodiment which concerns on this invention. It is a figure which shows typically the structure of the hybrid vehicle of a prior art.

  Hereinafter, a hybrid vehicle and a backward traveling method according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically showing a configuration of a hybrid vehicle according to an embodiment of the present invention, and FIG. 2 is a diagram schematically showing a configuration of a hybrid vehicle according to the prior art. Although a parallel type hybrid vehicle will be described here as an example, it is not necessarily a parallel type hybrid vehicle, and may be a hybrid vehicle having a function capable of driving a stepped transmission only by a motor generator.

  A hybrid vehicle (HEV) 1 according to an embodiment of the present invention includes a hybrid system 2 including an engine (internal combustion engine) 10, a motor generator (traveling motor generator) 20, and a stepped transmission 30. The vehicle travels by transmitting the power of the engine 10 and the power of the motor generator 20 to wheels (not shown) via the stepped transmission 30, and is one of the power of the engine 10 and the power of the motor generator 20. Or it is comprised so that both can be made into the power source for driving | running | working.

  As shown in FIG. 1, the power of the engine 10 is not shown through a fluid coupling (fluid coupling) 11 connected to the engine 10, an engine power connecting / disconnecting clutch 12, and a stepped transmission 30. Further, the hybrid vehicle 1 travels by being transmitted to the wheels via the propeller shaft, the differential (differential gear), and the axle. A torque converter may be used instead of the fluid coupling 11.

  On the other hand, the motive power of the motor generator 20 is generated by supplying the electric power charged (accumulated) in the battery 22 to the motor generator 20 via the inverter 21, and the motive power of the motor generator 20 is the power take-off. It is transmitted to the wheels via a device (PTO) 23, a motor generator power connection / disconnection clutch 24 (disengaged in FIG. 2), a stepped transmission 30, a propeller shaft, a differential, an axle, and the like.

  With these configurations, one or both of the power of the engine 10 and the power of the motor generator 20 are transmitted to the wheels via the stepped transmission 30, and the hybrid vehicle 1 travels.

  In the configuration of FIG. 1, transmission and disconnection of the power of the engine 10 to the wheels are performed by switching between connection and disconnection of the engine power connection / disconnection clutch 12, and connection / disconnection of the motor generator power connection / disconnection clutch 24. By switching the disconnection, the power of the motor generator 20 is transmitted to and cut off from the wheels. However, it is sufficient that the power of the engine 10 or the power of the motor generator 20 can be switched and cut off as appropriate. The connection / disconnection clutch 12 or the motor generator power connection / disconnection clutch 24 may not be provided.

  And the hybrid system 2 provided with the engine 10, the motor generator 20, and the stepped transmission 30, and the control apparatus 40 for controlling the hybrid vehicle 1 are provided. By this control device 40, overall control of the engine 10, overall control of the motor generator 20 by the inverter 21, selection of the transmission gear stage Fgn (FIG. 1, n = 1, 2, 6) of the stepped transmission 30 And the overall control of the hybrid vehicle 1 including the overall control of the hybrid system 2 including the connection / disconnection control of the engine power connection / disconnection clutch 12 and the connection / disconnection control of the motor generator power connection / disconnection clutch 24.

  In the present invention, as shown in FIG. 1, the stepped transmission 30 includes an input shaft 30a, a counter shaft 30b, a transmission mechanism 30c, and an output shaft 30d. The stepped transmission 30 includes N gear stages (N = 6 (1st to 6th) in FIG. 1) for forward travel corresponding to the countershaft 30b and the output shaft 30d, respectively. The reverse gear stage (reverse gear stage) is not provided.

  When this configuration is compared with the stepped transmission 30X of the hybrid system 2X mounted on the hybrid vehicle 1X of the prior art as shown in FIG. 2, the transmission mechanism 30Xc of the stepped transmission 30X of the prior art has a hybrid In addition to the N-speed gear stage Fgn (N = 6 (1st to 6th) in FIG. 2) for forward traveling of the vehicle 1X, the reverse gear stage Rev is associated with each of the counter shaft 30Xb and the output shaft 30Xd. I have.

  When both the present invention and the conventional hybrid vehicles 1 and 1X travel forward using the power of the engines 10 and 10X, the engine power connecting / disconnecting clutch 12 is brought into the engaged state, and the power of the engines 10 and 10X is increased. Is transmitted to the countershafts 30b and 30Xb via the input shafts 30a and 30Xa. At this time, the forward transmission gear stage Fgn of the transmission mechanisms 30c, 30Xc is selected according to the driver's required torque, and the power of the engines 10, 10X is selected from the counter shafts 30b, 30Xb. It is transmitted to the output shafts 30d and 30Xd via Fgn and transmitted to the wheel side.

  When the motor generator 20 or 20X is used to move forward, the motor generator power connecting / disconnecting clutch 24 is brought into the engaged state, and the power of the motor generator 20 or 20X is supplied to the countershaft via the PTO 23. 30 and 30Xb. At this time, the transmission gear stage Fgn of the transmission mechanism 30c, 30Xc is selected according to the driver's requested torque, and is transmitted from the counter shaft 30b, 30Xb to the output shaft 30d, 30Xd via the selected gear stage Fgn. It is transmitted to the wheel side.

  That is, in the hybrid vehicle 1 of the present invention and the hybrid vehicle 1X of the prior art, the same control and the same power transmission path are used for forward travel.

  On the other hand, in the hybrid vehicle 1 of the present invention and the hybrid vehicle 1X of the prior art, different control and different gear stages are selected in reverse travel. In reverse travel using the conventional stepped transmission 30X, when the driver operates a shift lever (not shown) on the driver's seat to reverse (reverse), the control device 40X that controls the hybrid system 2X is Then, control is performed to select the reverse gear stage Rev for reverse travel of the stepped transmission 30X. As a result, the power of the engine 10X or the power of the motor generator 20X is made to travel backward, with the output shaft 30Xd rotating in the reverse direction to the forward direction via the reverse gear stage Rev of the stepped transmission 30X.

  On the other hand, in the reverse travel of the present invention, when the control device 40 is operated reversely (reverse) during reverse travel, the transmission gear of the stepped transmission 30 is operated. The stage Fgn is set to a low speed gear stage Fgi (i = 1, 2,..., “1st” (i = 1) in FIG. 1) for forward traveling. At the same time, the engine power connecting / disconnecting clutch 12 is disengaged to interrupt the transmission of the power of the engine 10 to the stepped transmission 30. Further, the motor generator power connecting / disconnecting clutch 24 is engaged, the motor generator 30 is rotated in the reverse direction, the power of the motor generator 30 is transmitted to the stepped transmission 30, and the hybrid vehicle 1 is moved backward. Control to do. As a result, the vehicle travels backward without using the reverse gear. The reverse rotation of the motor generator 30 means that the motor generator 20 is rotated in the direction opposite to the direction in which the motor generator 20 rotates when the hybrid vehicle 1 travels forward.

  That is, the power of the engine 10 is prevented from being transmitted to the input shaft 30a, and the motor generator 20 is rotated in a direction opposite to the direction of rotation when the hybrid vehicle 1 travels forward. The hybrid vehicle 1 travels backward by transmitting to the wheel side via the counter shaft 30b, the low speed gear stage Fgl for forward travel, and the output shaft 30d.

  The above-described low speed gear stage Fgi for forward traveling is usually the first stage (first speed) or the second stage (second speed) (“1st” (i = 1), “2nd” (i = 2) in FIG. 1)). Is preferably selected. As a result, when the hybrid vehicle 1 shifts from reverse travel to forward travel by the motor generator 20, it is not necessary to change the gear stage Fgn connecting the stepped transmission 30 and the motor generator 20, and the reverse travel is promptly performed. It is possible to shift from traveling to forward traveling.

  The method for controlling the hybrid vehicle 1 including the stepped transmission 30 includes the hybrid system 2 including the engine 10, the motor generator 20, and the stepped transmission 30. In the reverse travel method of the hybrid vehicle 1 that transmits the power of the engine 10 and the power of the motor generator 20 to the wheels, the stepped transmission 30 is configured without a reverse gear stage, and at the time of reverse travel, When the shift lever of the step transmission 30 is operated in reverse (reverse), the gear stage Fgn of the stepped transmission 30 is changed to the low speed gear stage Fgi (i = 1, 2, etc.) for forward travel. The transmission of the power of the engine 10 to the transmission 30 is interrupted, and the motor generator 20 is reversely rotated to transmit the power of the motor generator 20 to the stepped transmission 30. Do Is a method which is characterized in.

  According to the hybrid vehicle 1 configured as described above and the backward traveling method, the reverse gear stage is not provided in the stepped transmission 30, so that the number of parts can be reduced and the cost can be reduced. Further, only the portion without the reverse gear stage can be reduced in weight, and the overall length of the stepped transmission can be shortened, so that the stepped transmission 30 can be reduced in size. As a result, the hybrid vehicle 1 can be reduced in weight, and the fuel consumption improvement effect can be obtained.

1, 1X hybrid vehicle 2, 2X hybrid system 10, 10X engine (internal combustion engine)
11 Fluid coupling (fluid coupling)
12 Engine power connection / disconnection clutch 20, 20X Motor generator 21 Inverter 22 Battery 23 Power take-off device (PTO)
24 Motor generator connecting / disconnecting clutch 30, 30X Stepped transmission 30a, 30Xa Input shaft 30b, 30Xb Countershaft 30c, 30Xc Transmission mechanism 30d, 30Xd Output shaft 40, 40X Control device Fgn Shift gear for forward travel ( n = 1, 2,... N, N = 6)
Fgi low speed gear stage (i = 1, 2, ...)
Rev Reverse gear stage

Claims (2)

In a hybrid vehicle equipped with a hybrid system including an internal combustion engine, a motor generator, and a stepped transmission, and transmitting the power of the internal combustion engine and the power of the motor generator to wheels via the stepped transmission,
When the control device for controlling the hybrid system is in reverse travel, when the shift lever of the stepped transmission is operated in reverse, the gear stage of the stepped transmission is set to a low speed gear stage for forward travel, The transmission of the power of the internal combustion engine to the stepped transmission is cut off, and the motor generator is reversely rotated to transmit the power of the motor generator to the stepped transmission. It is configured to control the reverse travel, and
A hybrid vehicle, wherein the stepped transmission is configured without a reverse gear. A hybrid system including an internal combustion engine, a motor generator, and a stepped transmission is mounted, and the hybrid vehicle reversely transmits the power of the internal combustion engine and the power of the motor generator to wheels via the stepped transmission. In the driving method,
The stepped transmission is configured without a reverse gear, and
During reverse travel, when the shift lever of the stepped transmission is operated in reverse, the gear stage of the stepped transmission is changed to a low speed gear stage for forward travel, and the internal combustion engine to the stepped transmission The power transmission of the hybrid vehicle is cut off, and the motor generator is reversely rotated to transmit the power of the motor generator to the stepped transmission, so that the hybrid vehicle travels backward. The reverse running method of the vehicle.

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