阅读说明：本技术 车辆用驱动装置的控制装置 (Control device for vehicle drive device ) 是由 友松大辅 近藤智敬 铃村京平 袴着纯 于 2019-08-05 设计创作，主要内容包括：本申请提供一种能够在对动力传递路径进行切换时于不产生控制干涉的条件下而对无级变速器中的打齿声进行抑制的车辆用驱动装置的控制装置。在输入轴和输出轴之间选择性地形成经由齿轮机构的第一动力传递路径和经由带式无级变速器的第二动力传递路径的车辆用驱动装置的控制装置具备：第一行驶状态判断部,其对车辆用驱动装置是否处于第一行驶状态进行判断,第一行驶状态为形成了第一动力传递路径的状态、且为有可能在带式无级变速器和输入轴之间产生异常音的被预先规定的状态；带夹压力控制部,其在通过第一行驶状态判断部而被判断为处于第一行驶状态的情况下,实施与不同于第一行驶状态的第二行驶状态时相比使带式无级变速器的带夹压力升高的控制。(Provided is a control device for a vehicle drive device, which can suppress gear rattling noise in a continuously variable transmission without causing control interference when switching a power transmission path. A control device for a vehicle drive device, which selectively forms a first power transmission path via a gear mechanism and a second power transmission path via a belt type continuously variable transmission between an input shaft and an output shaft, is provided with: a first driving state determination unit that determines whether or not the vehicle drive device is in a first driving state in which a first power transmission path is formed and a predetermined state in which an abnormal sound is likely to occur between the belt type continuously variable transmission and the input shaft; and a belt clamping pressure control unit that, when the first traveling state determination unit determines that the belt is in the first traveling state, performs control to increase a belt clamping pressure of the belt type continuously variable transmission as compared to a belt clamping pressure in a second traveling state different from the first traveling state.)

1. A control device (100) of a vehicular drive device (90), the vehicular drive device (90) selectively forming, between an input shaft (22) and an output shaft (30), a first power transmission path (PT1) via a gear mechanism (28) and a second power transmission path (PT2) via a belt type continuously variable transmission (24),

the control device (100) is characterized by comprising:

a first travel state determination unit (102) that determines whether or not the vehicle drive device (90) is in a first travel state that is a state in which the first power transmission path (PT1) is formed and that is a predetermined state in which an abnormal sound is likely to occur between the belt type continuously variable transmission (24) and the input shaft (22);

and a belt clamping pressure control unit (106) that, when the first travel state determination unit (102) determines that the vehicle drive device (90) is in the first travel state, starts to perform belt clamping pressure increase control that increases a belt clamping pressure of the belt-type continuously variable transmission (24) compared to a travel state that is different from the first travel state.

2. The control device (100) of a drive device (90) for a vehicle according to claim 1,

a second running state determination unit (104) that determines whether or not the vehicle drive device (90) is in a second running state that is a state in which the first power transmission path (PT1) is formed and that is different from the first running state, is provided,

when the vehicle drive device (90) is determined to be in the second travel state by the second travel state determination unit (104), the belt clamping pressure control unit performs belt clamping pressure lowering control for returning the belt clamping pressure of the belt type continuously variable transmission (24) to a state before the start of the belt clamping pressure raising control.

3. The control device (100) of a drive device (90) for a vehicle according to claim 2,

the belt clamping pressure control unit (106) maintains the belt clamping pressure increase control when the vehicle drive device (90) is in a third travel state that is different from either the first travel state or the second travel state after the vehicle drive device (90) is determined to be in the first travel state by the first travel state determination unit (102) and before the vehicle drive device (90) is determined to be in the second travel state by the second travel state determination unit (104).

4. The control device (100) of a vehicular drive device (90) according to any one of claims 1 to 3,

the belt clamping pressure increase control is control for increasing a secondary pressure for controlling a V groove width of a secondary pulley (60) of the belt type continuously variable transmission (24).

5. The control device (100) of a vehicular drive device (90) according to any one of claims 1 to 4,

the vehicle drive device (90) is provided with first connection/disconnection devices (B1, C1, D1) forming the first power transmission path (PT1), and a second connection/disconnection device (C2) forming the second power transmission path (PT2),

at least one of a case where the first connection/disconnection device (B1, C1, D1) and the second connection/disconnection device (C2) are controlled so as to form the first power transmission path (PT1) and a case where a primary input shaft rotation speed (Npri) of a primary pulley (58) provided in the belt type continuously variable transmission (24) is within a predetermined rotation speed range (Nc1_ L to Nc1_ H) are established, the condition for raising the belt clamping pressure of the continuously variable transmission (24); a throttle opening (TAP) is below a preset opening value (TAP _ j); and the case where the operating oil temperature (Tho) is within a predetermined temperature range (Tho _ L to Tho _ H).

Technical Field

The present invention relates to a control device for a vehicle drive device in which a first power transmission path via a gear mechanism and a second power transmission path via a belt-type continuously variable transmission are selectively formed between an input shaft and an output shaft, and relates to suppression of gear rattling noise generated between the belt-type continuously variable transmission and the input shaft.

Background

In a vehicle drive device including a drive power source (engine) and a vehicle power transmission device that transmits power of the drive power source to drive wheels, there is a vehicle drive device in which a first power transmission path via a gear mechanism and a second power transmission path via a belt type continuously variable transmission are selectively formed between an input shaft and an output shaft. In a vehicle mounted with such a vehicle drive device, there may be a gap (clearance) around the axial center at a spline fitting portion between a primary pulley of the belt type continuously variable transmission and an input shaft that transmits power to the primary pulley. For example, when the vehicle drive device is in a state in which the first power transmission path is formed and a predetermined running state (for example, a low-speed running state) is achieved, there is a possibility that rattling noise is generated in the gap of the spline fitting portion, and a driver feels a sense of discomfort. A control device for a vehicle drive device is known in which a connection/disconnection device for forming a second power transmission path is half engaged during travel in which a first power transmission path is formed in order to suppress the gear rattling noise. For example, a control device for a vehicle drive device described in patent document 1 is such a control device.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-36782

Disclosure of Invention

Problems to be solved by the invention

In the control device for the vehicle drive device, the connection/disconnection device for forming the second power transmission path is half engaged during the travel in which the first power transmission path is formed. Therefore, when the power transmission path is switched from the first power transmission path to the second power transmission path, there is a possibility that an engagement shock or a switching delay occurs in the connection/disconnection device when the power transmission path is switched due to control interference in the connection/disconnection device.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control device for a vehicle drive device capable of suppressing a rattling noise between a belt type continuously variable transmission and an input shaft without causing control interference in a connection/disconnection device when switching a power transmission path.

Means for solving the problems

A first aspect of the present invention is summarized as a control device for a vehicle drive device that selectively forms a first power transmission path via a gear mechanism and a second power transmission path via a belt type continuously variable transmission between an input shaft and an output shaft, the control device including: a first traveling state determination unit that determines whether or not the vehicle drive device is in a first traveling state in which the first power transmission path is formed and a predetermined state in which an abnormal sound is likely to occur between the belt type continuously variable transmission and the input shaft; and a belt clamping force control unit that starts to perform belt clamping force increasing control for increasing a belt clamping force of the belt type continuously variable transmission compared to a case of a running state different from the first running state, when it is determined by the first running state determination unit that the vehicle drive device is in the first running state.

A second aspect of the invention is summarized as the first aspect of the invention, including a second running state determination unit that determines whether or not the vehicle drive device is in a second running state that is a state in which the first power transmission path is formed and that is different from the first running state, wherein the belt clamping pressure control unit performs belt clamping pressure lowering control for returning the belt clamping pressure of the belt type continuously variable transmission to a state before starting the belt clamping pressure raising control when the second running state determination unit determines that the vehicle drive device is in the second running state.

A third aspect of the present invention is summarized as the second aspect of the present invention in that the belt clamping pressure control unit maintains the belt clamping pressure increasing control when the vehicle driving device is in a third traveling state different from any one of the first traveling state and the second traveling state after the vehicle driving device is determined to be in the first traveling state by the first traveling state determination unit and before the vehicle driving device is determined to be in the second traveling state by the second traveling state determination unit.

A fourth aspect of the present invention is the belt clamping force increase control according to any one of the first to third aspects of the present invention, wherein the belt clamping force increase control is control for increasing a secondary pressure for controlling a V groove width of the secondary pulley of the belt type continuously variable transmission.

A fifth aspect of the invention is the vehicle drive device according to any one of the first to fourth aspects of the invention, wherein the vehicle drive device includes a first connection/disconnection device that forms the first power transmission path and a second connection/disconnection device that forms the second power transmission path, and wherein a condition for increasing a belt clamping force of the continuously variable transmission is satisfied when at least one of a situation in which the first connection/disconnection device and the second connection/disconnection device are controlled so as to form the first power transmission path and a situation in which a rotation speed of a primary input shaft of a primary pulley provided in the belt-type continuously variable transmission is within a predetermined rotation speed range is satisfied; a case where the throttle opening is equal to or smaller than a predetermined opening value; and the case where the temperature of the operating oil is within a predetermined temperature.

Effects of the invention

A control device for a vehicle drive device according to a first aspect of the invention includes: a first traveling state determination unit that determines whether or not the vehicle drive device is in a first traveling state in which the first power transmission path is formed and a predetermined state in which an abnormal sound is likely to occur between the belt type continuously variable transmission and the input shaft; and a belt clamping force control unit that starts to perform belt clamping force increasing control for increasing a belt clamping force of the belt type continuously variable transmission compared to a case of a running state different from the first running state, when it is determined by the first running state determination unit that the vehicle drive device is in the first running state. In this way, in the first running state in which there is a possibility of generation of abnormal sounds, the drag torque of the belt type continuously variable transmission is increased by increasing the belt clamping force of the belt type continuously variable transmission as compared with that in the running state different from the first running state. Thus, the occurrence of tooth hitting noise in a gap around the shaft center of a spline fitting portion between the belt type continuously variable transmission and an input shaft that transmits power to the belt type continuously variable transmission is suppressed. Further, since there is no control interference in the connection/disconnection device when the power transmission path is switched from the first power transmission path to the second power transmission path, it is possible to suppress the occurrence of an engagement shock in the connection/disconnection device and to prevent a switching delay.

The control device for a vehicle driving device according to a second aspect of the invention includes a second travel state determination unit that determines whether or not the vehicle driving device is in a second travel state in which the first power transmission path is formed, and the belt clamping pressure control unit performs belt clamping pressure lowering control for returning the belt clamping pressure of the belt type continuously variable transmission to a state before start of the belt clamping pressure raising control when the vehicle driving device is determined to be in the second travel state by the second travel state determination unit. In the second running state different from the first running state in which there is a possibility of generation of abnormal sounds, since the load of the drive power source is relieved by the belt clamping pressure of the belt type continuously variable transmission being restored to the state before the start of the belt clamping pressure increasing control, the energy utilization efficiency of the drive power source, such as the fuel consumption, is improved.

According to the control device for the vehicular drive apparatus of the third aspect of the invention, the belt clamping pressure control portion maintains the belt clamping pressure increasing control when the vehicular drive apparatus is in the third travel state different from any one of the first travel state and the second travel state after the first travel state determination portion determines that the vehicular drive apparatus is in the first travel state and before the second travel state determination portion determines that the vehicular drive apparatus is in the second travel state. Thus, it is possible to avoid a situation in which the belt clamping pressure increasing control and the belt clamping pressure decreasing control are frequently repeated due to the frequent repetition of the determination that the vehicle driving device is in the first traveling state or the determination that the vehicle driving device is in the second traveling state.

According to the control device for the vehicle drive device of the fourth aspect, the belt clamping pressure increase control is control for increasing the secondary pressure that controls the V groove width of the secondary pulley of the belt type continuously variable transmission. By the control of raising the secondary pressure in this way, the belt clamping pressure of the transmission belt is raised, and the drag torque of the belt type continuously variable transmission is increased. Thus, the occurrence of tooth hitting noise in a gap around the shaft center of a spline fitting portion between the belt type continuously variable transmission and an input shaft that transmits power to the belt type continuously variable transmission is suppressed.

A control device for a vehicular drive device according to a fifth aspect of the invention is provided with a first connection/disconnection device that forms the first power transmission path and a second connection/disconnection device that forms the second power transmission path, and the condition for increasing a belt clamping pressure of the continuously variable transmission is at least one of a case where the first connection/disconnection device and the second connection/disconnection device are controlled so as to form the first power transmission path and a case where a rotation speed of a primary input shaft of a primary pulley provided in the belt-type continuously variable transmission is within a predetermined rotation speed range; a case where the throttle opening is equal to or smaller than a predetermined opening value; and the case where the temperature of the operating oil is within a predetermined temperature. Since the predetermined rotation speed range, the predetermined opening value, and the predetermined temperature range, which are the determination values of the respective conditions, are experimentally or designably obtained in advance for each different vehicle type, the occurrence of tooth hitting noise in a gap around the shaft center of a spline fitting portion between the belt type continuously variable transmission and an input shaft that transmits power to the belt type continuously variable transmission is suppressed by setting the determination values corresponding to the different vehicle types even if the vehicle type is different.

Drawings

Fig. 1 is a schematic diagram of a vehicle in which an electronic control device of a vehicle drive device according to an embodiment of the present invention is mounted, and is a diagram illustrating a control function and a main part of a control system of the electronic control device for performing various controls in the vehicle.

Fig. 2 is a diagram for explaining switching of the running mode of the power transmission device shown in fig. 1.

Fig. 3 is a hydraulic circuit diagram for explaining a main portion related to shift control of the belt type continuously variable transmission in the hydraulic control circuit shown in fig. 1.

Fig. 4 is a flowchart illustrating control operations of the secondary pressure and the line pressure supplied to change the drag torque of the belt type continuously variable transmission in the electronic control device shown in fig. 1.

Fig. 5 is an example of a timing chart in the case where the secondary pressure and the line pressure supplied to suppress generation of abnormal noise between the belt type continuously variable transmission and the input shaft in the electronic control device shown in fig. 1 are controlled.

Fig. 6 is another example of a timing chart in the case where the secondary pressure and the line pressure supplied to suppress generation of abnormal noise between the belt type continuously variable transmission and the input shaft in the electronic control device shown in fig. 1 are controlled.

Detailed Description