Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Clutch control
Patent
1999-01-07
2000-07-11
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Clutch control
701 66, 701 53, 701 51, 477168, 477 45, 477 70, 477 79, 477143, B60K 4118, B60K 4102, F16H 540
Patent
active
060886455
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a control device and a control method for a transmission with a clutch, and the invention particularly relates to a control device and a control method for a transmission with a clutch which is preferable for a construction vehicle, such as a wheel loader, in which tires are used.
BACKGROUND ART
Japanese Laid-open Patent No. 62-132060 discloses a control method for a transmission by which a clutch of the transmission is smoothly engaged. The configuration of the proposed clutch hydraulic control device is shown in a sectional view in FIG. 8 and in a hydraulic circuit diagram in FIG. 9. In FIG. 9, a clutch hydraulic control device 50 operates a clutch hydraulic control valve 52 in response to a command from a controller 51, and sends pressurized oil from a hydraulic pump 53 to a clutch chamber 54 to achieve a smooth engagement. The clutch hydraulic control valve 52 includes valves for a forward gear 52A, a reverse gear 52B, a first speed gear, a second speed gear, and the like.
The clutch hydraulic control valve 52 includes a pressure control valve 60 for controlling the clutch oil pressure, a flow rate detecting valve 70 for detecting the pressurized oil flowing from the hydraulic pump 53 to the clutch chamber 54 via the pressure control valve 60 and the flow rate detecting valve 70, and a filling completion detecting sensor 80 (hereinafter called a filling sensor 80) for detecting that the clutch chamber 54 is filled with oil, that is, the filling is completed. The pressure control valve 60 is controlled by the controller 51, and a detection signal from the filling sensor 80 is inputted into the controller 51.
The pressure control valve 60, the flow rate detecting valve 70, and the filling sensor 80 are mounted on a body 90 as shown in FIG. 8. The body 90 is provided with a pump port 91 into which pressurized oil flows from the hydraulic pump 53, an output port 92 which supplies pressure oil into the clutch chamber 54, and drain ports 93 and 94, shown in FIG. 8, which return oil returning or leaking from the clutch chamber 54 to a tank 95. The pressure control valve 60 includes a pressure control valve spool 61 (hereinafter, called a control valve spool 61), a piston 62, a proportional solenoid 63, and a first spring 64. The right end portion of the control valve spool 61 is abutted to a plunger 63a of the proportional solenoid 63, and the spring 64 is abutted to the left end portion thereof, thereby pressing the control valve spool 61 toward the proportional solenoid 63 side. The pressure in an oil passage 67 (the pressure to the clutch chamber 54) acts on an oil chamber 65 inside the spool 61, which is defined by the control valve spool 61 and the piston 62 in an oil passage 66 formed inside the control valve spool 61.
The flow rate detecting valve 70 includes a flow rate detecting valve spool 71 (hereinafter, called a detecting valve spool 71), a second spring 72, and a third spring 73. Three raised portions are formed on the detecting valve spool 71, and these raised portions divisionally form a first oil chamber 74, a second oil chamber 75, and a third oil chamber 76. A hole 77 is provided in the raised portion of the detecting valve spool 71 which is between the second oil chamber 75 and the third oil chamber 76. The detecting valve spool 71 has three different pressure receiving areas Aa, Ab, and Ac, and allows these areas to have the relationships (Aa+Ac)>Ab, and Ab>Ac. The second spring 72 is abutted to and inserted into the left end portion of the detecting valve spool 71, and the third spring 73 is abutted to and inserted into the right end portion thereof. When pressure is not generated in the second oil chamber 75 and the third oil chamber 76, the detecting valve spool 71 is held in a neutral position where the second spring 72 and the third spring 73 respectively have free length. Accordingly, when the detecting valve spool 71 is not operated (the illustration shows a situation in which it is operated), the pressurized oil flowing in
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Kawasaki Nobuaki
Kuse Takashi
Shibata Akira
Cuchlinski Jr. William A.
Hernandez Olga
Komatsu Ltd.
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