JPS6449760A - Control device for oil pressure of belt type continuously variable transmission of vehicle - Google Patents
Control device for oil pressure of belt type continuously variable transmission of vehicleInfo
- Publication number
- JPS6449760A JPS6449760A JP20879287A JP20879287A JPS6449760A JP S6449760 A JPS6449760 A JP S6449760A JP 20879287 A JP20879287 A JP 20879287A JP 20879287 A JP20879287 A JP 20879287A JP S6449760 A JPS6449760 A JP S6449760A
- Authority
- JP
- Japan
- Prior art keywords
- limit point
- speed ratio
- control device
- driving signal
- continuously variable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
PURPOSE:To prevent the lowering of durability of a power transmission belt by providing a means of detecting the limit point at which the change in speed ratio of a continuously variable transmission is mechanically limited and restricting a driving signal to a speed change control valve before the limit point is reached. CONSTITUTION:An electronic control device 350 receives engine speed, the rotating speeds of the input and output shafts of a CVT 16, a throttle valve opening, etc., from sensors 352, 354, 356, 358, determines a target speed ratio, and outputs a driving signal to the solenoid valves 272, 290 of an oil pressure controlling circuit so as to make an actual value agrees with the target speed ratio to control line oil pressures to be fed into hydraulic actuators 70, 72. Here, the electronic control device 350 detects a limit point at which the speed ratio of the CVT 16 is mechanically limited by means of a learning routine and restricts the driving signal through a restricting means before the limit point is reached. Thereby, oil pressures in hydraulic actuators can be prevented from rising more than necessary, while preventing the lowering of durability of a power transmission belt as well as the occurrence of the power loss of an oil pump.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62208792A JP2794695B2 (en) | 1987-08-21 | 1987-08-21 | Control device for belt-type continuously variable transmission for vehicles |
US07/232,666 US4867732A (en) | 1987-08-21 | 1988-08-16 | Control device for belt-and-pulley type continuously variable transmission for a vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62208792A JP2794695B2 (en) | 1987-08-21 | 1987-08-21 | Control device for belt-type continuously variable transmission for vehicles |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6449760A true JPS6449760A (en) | 1989-02-27 |
JP2794695B2 JP2794695B2 (en) | 1998-09-10 |
Family
ID=16562190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62208792A Expired - Lifetime JP2794695B2 (en) | 1987-08-21 | 1987-08-21 | Control device for belt-type continuously variable transmission for vehicles |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2794695B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006029515A (en) * | 2004-07-20 | 2006-02-02 | Toyota Motor Corp | Control device for continuously variable transmission |
JP2006242250A (en) * | 2005-03-02 | 2006-09-14 | Toyota Motor Corp | Shift control device for belt type continuously variable transmission |
JP2007071301A (en) * | 2005-09-07 | 2007-03-22 | Jatco Ltd | Oil pressure controller for belt type continuously variable transmission for vehicle |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59217051A (en) * | 1983-05-23 | 1984-12-07 | Toyota Motor Corp | Control for stepless speed change gear for car |
JPS61291229A (en) * | 1986-04-25 | 1986-12-22 | Nissan Motor Co Ltd | Controller for continuously variable transmission |
-
1987
- 1987-08-21 JP JP62208792A patent/JP2794695B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59217051A (en) * | 1983-05-23 | 1984-12-07 | Toyota Motor Corp | Control for stepless speed change gear for car |
JPS61291229A (en) * | 1986-04-25 | 1986-12-22 | Nissan Motor Co Ltd | Controller for continuously variable transmission |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006029515A (en) * | 2004-07-20 | 2006-02-02 | Toyota Motor Corp | Control device for continuously variable transmission |
JP2006242250A (en) * | 2005-03-02 | 2006-09-14 | Toyota Motor Corp | Shift control device for belt type continuously variable transmission |
JP2007071301A (en) * | 2005-09-07 | 2007-03-22 | Jatco Ltd | Oil pressure controller for belt type continuously variable transmission for vehicle |
Also Published As
Publication number | Publication date |
---|---|
JP2794695B2 (en) | 1998-09-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 10 Free format text: PAYMENT UNTIL: 20080626 |