Vehicle control device

Abstract

To provide a vehicle control device that can suppress resonant oscillation generated during four-wheel drive.SOLUTION: A vehicle control device capable of switching between two-wheel driving and four-wheel driving includes a controller for setting a shift line of four-wheel driving to a high-speed side relative to a shift line during two-wheel driving.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a control device for a vehicle. [Background technology]

[0002] Patent Document 1 discloses a vehicle control device capable of switching between two-wheel drive and four-wheel drive. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-112449 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a frame vehicle in which the body is supported by a vehicle frame as disclosed in Patent Document 1, when upshifting in four-wheel drive, resonant vibration occurs. This is because the torsional vibration frequency of the drivetrain when shifting in four-wheel drive is close to the resonant frequency of the vehicle.

[0005] The present disclosure has been made in consideration of the above, and has an object to provide a vehicle control device that can suppress resonant vibration during four-wheel drive. [Means for solving the problem]

[0006] The vehicle control device according to the present disclosure is a vehicle control device capable of switching between two-wheel drive and four-wheel drive, and is provided with a control unit that sets the four-wheel drive shift line to the higher speed side compared to the shift line in two-wheel drive. Effect of the Invention

[0007] According to the present disclosure, it is possible to suppress resonant vibration during four-wheel drive. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a vehicle to which a vehicle control device according to an embodiment is applied. [Diagram 2] FIG. 2 is a flowchart showing the flow of a vehicle control method executed by the vehicle control device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A vehicle control device according to an embodiment of the present disclosure will be described with reference to the drawings. Note that components in the following embodiments include those that are easily replaceable by a person skilled in the art, or those that are substantially the same.

[0010] (Vehicle control device) The configuration of a vehicle control device according to the embodiment will be described with reference to Fig. 1. A vehicle to which the vehicle control device according to the embodiment is applied is a frame vehicle in which a vehicle body is supported by a vehicle frame. Also, a vehicle to which the vehicle control device according to the embodiment is applied is a vehicle capable of switching between two-wheel drive and four-wheel drive. In other words, a vehicle capable of mechanically disconnecting two-wheel drive and four-wheel drive.

[0011] The type of vehicle to which the vehicle control device according to the embodiment is applied is not particularly limited. For example, the vehicle may be a general engine vehicle, a hybrid vehicle (HEV: Hybrid Electric Vehicle), a plug-in hybrid vehicle (PHEV: Plug-in Hybrid Electric Vehicle), etc. Alternatively, the vehicle may be a fuel cell electric vehicle (FCEV: Fuel Cell Electric Vehicle), an electric vehicle (BEV: Battery Electric Vehicle), etc.

[0012] A vehicle 1 to which the vehicle control device according to the embodiment is applied includes at least a control unit 11, a power source 12, a driving force distribution device 13, main drive wheels 14, and secondary drive wheels 15, as shown in Fig. 1. Note that, in the figure, only the components essential for implementing the vehicle control device according to the embodiment are extracted from the actual components of the vehicle 1 and illustrated.

[0013] The control unit 11 is an electronic control unit (ECU) whose main components are a microcomputer including a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like.

[0014] The power source 12 is, for example, an engine (in the case of an engine vehicle, a hybrid vehicle, or a plug-in hybrid vehicle), a motor (in the case of a hybrid vehicle, a plug-in hybrid vehicle, a fuel cell vehicle, or an electric vehicle), or the like.

[0015] The driving force distribution device 13 distributes the driving force from the power source 12 to main drive wheels 14 and secondary drive wheels 15. This driving force distribution device 13 is composed of, for example, a transfer that selectively switches between disconnection and connection of power transmission between a rear propeller shaft and a front propeller shaft of the vehicle 1.

[0016] The driving force distribution device 13 is provided, for example, near the driver's seat of the vehicle 1, and switches the driving state of the vehicle 1 between a two-wheel drive mode and a four-wheel drive mode in response to the operation of a drive changeover switch. The two-wheel drive mode is a mode in which the driving force from the power source 12 is distributed only to the main drive wheels 14. The four-wheel drive driving mode is a mode in which the driving force from the power source 12 is distributed to the main drive wheels 14 and the secondary drive wheels 15. The four-wheel drive driving mode includes a high gear mode (hereinafter referred to as "four-wheel drive (H4)") and a low gear mode (hereinafter referred to as "four-wheel drive (L4)").

[0017] The main drive wheels 14 are drive wheels in two-wheel drive and four-wheel drive, for example the rear wheels, and the secondary drive wheels 15 are drive wheels in four-wheel drive, for example the front wheels.

[0018] In a frame vehicle such as the vehicle 1, upshifting during four-wheel drive generates resonant vibrations. This is because the torsional vibration frequency of the drivetrain during a gear change during four-wheel drive is close to the resonant frequency of the vehicle 1, and the same shift line is used for both two-wheel drive and four-wheel drive.

[0019] Therefore, when the vehicle 1 is traveling in four-wheel drive (H4), the control unit 11 sets the four-wheel drive (H4) shift line to the higher speed side compared to the two-wheel drive shift line. Note that for four-wheel drive (L4), a dedicated shift line is used, so the shift line is not rewritten as described above. In this way, by shifting the four-wheel drive (H4) shift line to the higher speed side compared to the two-wheel drive shift line, it is possible to suppress resonant vibration.

[0020] (Vehicle control method) The flow of a vehicle control method executed by the vehicle control device according to the embodiment will be described with reference to FIG.

[0021] First, the control unit 11 determines whether the vehicle 1 is in four-wheel drive (H4) state (step S1). In step S1, it is determined whether the vehicle 1 is in four-wheel drive (H4) state based on, for example, the state of a drive changeover switch provided near the driver's seat of the vehicle 1.

[0022] In step S1, if it is determined that the vehicle 1 is in four-wheel drive (H4) state (Yes in step S1), the control unit 11 sets the shift line in four-wheel drive (H4) to the higher speed side compared to the shift line in two-wheel drive (step S2), and ends this process. Note that in step S1, if it is determined that the vehicle 1 is not in four-wheel drive (H4) state (No in step S1), the control unit 11 ends this process.

[0023] According to the vehicle control device of the embodiment described above, the 4WD (H4) shift line is shifted to the higher speed side relative to the 2WD shift line, thereby suppressing the sympathetic vibration. Also, the vehicle control device according to the embodiment can suppress the sympathetic vibration without changing the hardware configuration, thereby suppressing the increase in costs.

[0024] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0025] 1 vehicle 11 Control section 12 Power source 13 Driving force distribution device 14 Main drive wheel 15 Driven wheels

Claims

[Claim 1] A control device for a vehicle capable of switching between two-wheel drive and four-wheel drive, A control device for a vehicle comprising a control unit that sets the four-wheel drive shift line to a higher speed side relative to the two-wheel drive shift line.

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