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Four-wheel drive vehicle

A four-wheel drive, vehicle technology, applied in the direction of hybrid vehicles, motor vehicles, vehicle parts, etc., can solve the problems of NV performance deterioration, and achieve the effect of improving NV performance, NV performance improvement, and vehicle posture change suppression

Pending Publication Date: 2021-12-03
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the four-wheel drive vehicle equipped with the above-mentioned driving force distribution device, if the above-mentioned rattling sound is generated when the engine is stopped by the automatic stop control, there is a problem that the NV performance deteriorates.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] figure 1 It is a diagram illustrating a schematic configuration of a four-wheel drive vehicle 10 to which the present invention is applied, and is a diagram illustrating main parts of a control system for various controls in the four-wheel drive vehicle 10 . exist figure 1 Among them, the four-wheel drive vehicle 10 is a hybrid vehicle including an engine 12 (see "ENG" in the figure), a first rotating machine MG1 , and a second rotating machine MG2 as driving force sources. Thus, the four-wheel drive vehicle 10 is a vehicle provided with a driving force source including at least the engine 12 . In addition, the four-wheel drive vehicle 10 includes a pair of left and right front wheels 14L, 14R, a pair of left and right rear wheels 16L, 16R, and motors that transmit driving force from the engine 12 and the like to the front wheels 14L, 14R and rear wheels 16L, 16R, respectively. Power transmission device 18. The rear wheels 16L and 16R are main drive wheels that serve...

Embodiment 2

[0134] In the first embodiment described above, the distribution ratio change prohibition control CTpx is uniformly executed when the engine 12 is stopped and the background noise is smaller than when the engine 12 is running. Here, the background noise becomes louder during running at a high vehicle speed than during running or parking at a low vehicle speed. Therefore, during running at a high vehicle speed, the rattling sound accompanying the reversal of the motor rotation direction of the transfer case 30 is likely to be mixed into the background noise. Alternatively, during running at a high vehicle speed, it is preferable to suppress the influence on the vehicle controllability by the driving force distribution control CTx, so it is also considered to ensure the vehicle controllability by the driving force distribution control CTx. Therefore, the electronic control unit 130 prohibits changing the rear wheel side distribution ratio Xr by switching the rotation direction o...

Embodiment 3

[0154] In the aforementioned second embodiment, when the vehicle controllability achieved by the driving force distribution control CTx is prioritized over the improvement of the NV performance, the distribution ratio change prohibition control CTpx is not executed. However, in the first and second embodiments described above, when the engine 12 is not in the automatic stop state, the distribution ratio change prohibition control CTpx is not originally executed. Therefore, when a situation arises in which vehicle controllability by driving force distribution control CTx takes precedence over improvement in NV performance, distribution ratio change prohibition control CTpx is not executed while engine 12 is running. Therefore, in the case where it is predicted that vehicle controllability by driving force distribution control CTx will take precedence over NV performance improvement, if the engine 12 is set to the operating state in advance, in fact, the driving force distributio...

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Abstract

The invention provides a four-wheel drive vehicle capable of improving NV performance when an engine is in a stopped state through automatic stop control. When the engine is stopped by the automatic stop control (CTsp), the change of the rear-wheel-side distribution rate (Xr), which is achieved by switching the rotation direction of the motor, is prohibited. Therefore, when the background noise is small, the tooth beating sound generated due to the fact that the direction in which the gap between the worm wheel and the worm serving as the pushing mechanism and the parts of the cam mechanism is reduced is reversed can be prevented. Therefore, the NV performance can be improved when the engine is stopped by the automatic stop control (CTsp).

Description

technical field [0001] The present invention relates to a four-wheel drive vehicle configured to be able to adjust a ratio of driving force distributed to primary drive wheels and secondary drive wheels. Background technique [0002] A four-wheel drive vehicle is known, which is equipped with: a driving force distribution device capable of transmitting the driving force from a driving force source to the main driving wheels and the auxiliary driving wheels, and capable of adjusting the driving force distributed to the main driving wheels and the auxiliary driving wheels. a driving force distribution ratio of the ratio of the driving force to the wheels; an engine serving as the driving force source that outputs the driving force; and a control device that performs driving force distribution control that adjusts the driving force distribution ratio, and in Automatic stop control for automatically stopping the engine is performed when a predetermined stop condition is satisfie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/14B60W10/119B60W30/192B60W30/20B60W10/16B60W10/06B60W10/10F02D29/02B60K17/34
CPCB60W10/14B60W10/119B60W30/192B60W30/20B60W10/16B60W10/06B60W10/10F02D29/02B60K17/34B60K17/356B60K17/02B60K23/0808B60W2520/14B60W2520/125B60W10/02B60W2520/105B60W30/18145B60W2520/06B60W2510/18B60W10/08B60W2555/20B60K6/445B60W2720/403B60W2520/10B60W2540/18B60K6/547B60K6/383Y02T10/62F16H3/66B60K6/365B60K6/52F16H2200/0043F16H2200/2007F16H2200/2041F16H2200/2066B60Y2400/82B60K6/387B60W20/00B60W2710/021B60W2710/0644B60W2710/08B60W2720/40B60W2720/16B60Y2200/92B60Y2300/1815B60Y2300/192B60Y2300/429B60Y2300/43B60Y2300/60
Inventor 高以良幸司
Owner TOYOTA JIDOSHA KK
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