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Controller of variable valve actuator

A control device and valve mechanism technology, applied in the direction of engine control, valve device, engine components, etc., can solve the problems of friction torque increase, cost increase, etc., to reduce rated power, reduce power consumption, and prevent power consumption and the effect of an increase in rated power

Inactive Publication Date: 2009-09-23
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, according to the control device of the aforementioned Patent Document 1, since a new mechanism called a torque reduction mechanism is added, the cost increases.
Also, since the torque reduction mechanism is provided, there is a possibility that the friction torque between the cam and the valve increases

Method used

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  • Controller of variable valve actuator
  • Controller of variable valve actuator
  • Controller of variable valve actuator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0090] Structure of variable valve train

[0091] figure 1 It is a perspective view showing the configuration of the variable valve train 10 according to Embodiment 1 of the present invention. Such as figure 1 As shown, the variable valve mechanism 10 is provided on the intake valve 11 side of the engine 1 . The variable valve mechanism 10 can change the operating angle / lift amount of the intake valve 11 .

[0092] The engine 1 is, for example, an inline 4-cylinder gasoline engine. exist figure 1 Among them, #1 to #4 represent the first to fourth cylinders of the engine 1, respectively. The work order of the engine 1 is the same as that of a general engine, which is #1→#3→#4→#2.

[0093] The two intake valves 11 provided in each cylinder 2 are biased toward the valve lifter 13 by the spring reaction force of the valve spring 12 . On the top of each valve lifter 13, cams 14, 15, 16, 17 corresponding to each cylinder 2 are provided.

[0094] The cam 14 corresponding to t...

Embodiment approach 2

[0155] Next, refer to Figure 13 to Figure 16 Embodiment 2 of the present invention will be described.

[0156] As the system of the second embodiment, it is possible to use Figure 1 to Figure 5 hardware shown.

[0157] Features of Embodiment 2

[0158] In the first embodiment described above, the case of the mode in which the cams 14 to 17 are driven in normal rotation has been described. On the other hand, in the second embodiment, the case of the mode in which the cams 14 to 17 are oscillatingly driven will be described. as reference figure 2 As illustrated, the system described above can be used and a swing drive mode implemented.

[0159] Figure 13 A to Figure 13 C is a graph showing the influence of the spring reaction force acting on the camshaft on the cam speed in the second embodiment. Figure 14 It is a figure which shows the graph which determines the target value of the cam rotation speed when the cam base circle slides. Figure 15 It is a figure which ...

Embodiment approach 3

[0166] Next, refer to Figure 17 and Figure 18 , Embodiment 3 of the present invention will be described.

[0167] As the system of the third embodiment, it is possible to use Figure 1 to Figure 5 hardware shown.

[0168] Features of Embodiment 3

[0169] For example, in the low rotation range where the engine speed NE is 2000 rpm or less, the camshaft rotational inertial force is smaller than in the high rotation range. Therefore, as in the present invention, when the spring reaction force is canceled out by the camshaft rotational inertial force, the amount of change in the camshaft rotational inertial force due to the spring reaction force becomes large. In this way, if Figures 10A to 10E as well as Figure 17 As shown, in the low rotation domain, the actual angle of action is enlarged compared with the high rotation domain. Figure 17 It is a graph showing the relationship between the engine speed NE and the actual operating angle in the third embodiment. exist ...

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Abstract

A controller of variable valve actuator in which power consumption and rating of a motor can be reduced by reducing spring reaction during valve lift by the rotary inertial torque of a cam shaft. Before starting valve lift, the rotary inertial torque of a cam shaft is set at a predetermined level or above. From start of lift to the maximum lift, spring reaction of a valve spring is used as deceleration torque of the rotary inertial torque of the cam shaft. From the maximum lift to the end of lift, spring reaction is used as the acceleration torque of the rotary inertial torque of the cam shaft. The spring reaction is offset by the rotary inertial torque of the cam shaft, and only the friction resistant torque becomes the motor torque during valve lift.

Description

technical field [0001] The invention relates to a control device for a variable valve mechanism with an electric motor, in particular to the drive control of the electric motor. Background technique [0002] A control device for a variable valve train with an electric motor is known (for example, refer to Patent Document 1). The control device of this patent document 1 takes into account the valve spring torque, inertia torque, and in-cylinder compression torque generated during the opening and closing operations of the intake valve and the exhaust valve, and has a function of imparting a torque opposite to the above torque. Torque reduction mechanism. According to this, since the torque loaded on the electric motor can be reduced, the rated power of the electric motor can be reduced. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2005-171786 [0004] Patent Document 2: Japanese Unexamined Patent Publication No. 2005-171937 [0005] However, according to the c...

Claims

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Application Information

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IPC IPC(8): F01L13/00F02D13/02F01L1/26F02D29/02
CPCF01L2800/08F01L2820/042F02D13/0207F01L2001/0475Y02T10/142F01L1/143F01L2800/01F01L2001/0537F01L13/0015F01L2009/0426F01L2009/0411F01L9/04F02D13/0269F01L9/20F01L9/22F01L2009/2126Y02T10/12
Inventor 木户冈昭夫江崎修一
Owner TOYOTA JIDOSHA KK
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