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Controls for four-wheel drive vehicles

A four-wheel drive and control device technology, applied in the direction of control devices, vehicle components, vehicle subunit functions, etc., can solve problems such as the inability to electronically control the transmission torque control of the coupling

Active Publication Date: 2021-03-05
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, in the four-wheel drive vehicle of the above-mentioned Patent Document 2, since it is necessary to learn and correct the relationship when the vehicle is raised or the vehicle is placed on the chassis dynamometer, there is a relative disadvantage. Due to the temporal change of the electronically controlled coupling during the use of the vehicle, the transmission torque of the electronically controlled coupling cannot be controlled with high precision

Method used

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  • Controls for four-wheel drive vehicles
  • Controls for four-wheel drive vehicles
  • Controls for four-wheel drive vehicles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] figure 1 This is a frame diagram schematically illustrating the structure of a four-wheel drive vehicle 10 to which the present invention is preferably applied. exist figure 1 Among them, the four-wheel drive vehicle 10 is equipped with a four-wheel drive device based on FF (Front-en-gine Front-drive: front-engine, front-wheel drive), and the four-wheel drive device based on FF has: The first power transmission path transmits the driving force of the engine 12 to the left and right front wheels 14L, 14R corresponding to the main driving wheels, and transmits the driving force of the engine 12 to the left and right rear wheels 16L, 16R corresponding to the auxiliary driving wheels. Transmission of the second power transmission path. In the two-wheel drive state of the four-wheel drive vehicle 10, the driving force transmitted from the engine 12 via the automatic transmission 18 is distributed to the left and right front wheels 14L via the front wheel drive force distri...

Embodiment 2

[0123] Figure 12 to Figure 14 It is a figure explaining the electronic control device (control device) 190 of the four-wheel drive vehicle 10 which concerns on another embodiment of this invention. Compared with the electronic control device 78 of the first embodiment, the electronic control device 190 of the four-wheel drive vehicle 10 of the present embodiment has the following difference: the function of the first clutch control part 176 is deleted, so that the four-wheel drive vehicle travels from the four-wheel drive When switching to two-wheel drive running, the first clutch 24 is not released but is in the engaged state; the nominal characteristic storage unit 178d, the learning correction unit 178e, the connection completion and the second clutch control unit 178 are deleted. The point of the function of the judgment part 178c; the point of the difference in the function of the brake torque generating part 178g included in the second clutch control part 178; The rota...

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Abstract

The present disclosure provides a control device for a four-wheel drive vehicle, which controls the transmission torque with high precision with respect to the temporal change of the electronically controlled coupling during the use of the vehicle. During the running of the vehicle, when the braking torque (Ts1) is applied to the clutch drum (94L), the rotation speed (Ncl) of the clutch drum (94L) is controlled by the first coupling control unit (180), which is the same as that of the vehicle. The rotational speed (Np) of the propeller shaft (28) increases, and the transmission torque (T1) and braking are determined based on the rotational speed (Np) of the vehicle propeller shaft (28) and the rotational speed (Nwrl) of the rear wheel (16L). When the torque (Ts1) has been balanced, the I-T characteristic (L) stored in the I-T characteristic storage unit (180a) is learned and corrected, so that the left electronically controlled coupling can be controlled relative to the vehicle during use. The transmission torque (T1) is controlled with high accuracy according to the temporal change of the actuator (92L).

Description

technical field [0001] The present invention relates to a technology that includes an electronically controlled coupling that changes the transmission torque in accordance with the supplied drive current, and that opposes the coupling based on a preset relationship between the drive current and the transmission torque. In the four-wheel drive vehicle in which the driving current supplied by the coupling is electronically controlled, the relationship is learned and corrected while the vehicle is running. Background technique [0002] There is known a four-wheel drive vehicle that includes: an electronically controlled coupling that changes the transmission torque transmitted from an input-side rotating member to an output-side rotating member in accordance with a supplied drive current; A coupling mechanism that transfers the input side of the electronically controlled coupling to the The input of power to the rotating parts is turned off or on. For example, a four-wheel dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60K17/344
CPCB60K17/344B60Y2400/404B60K2023/0833B60Y2400/424B60K23/04B60K23/08B60K2023/043B60Y2400/422B60K23/0808F16D11/14F16D2500/10462B60K2023/0858F16D2011/006F16D2500/10431F16D48/064
Inventor 汤浅亮平
Owner TOYOTA JIDOSHA KK