Title:
SPEED CONTROL SYSTEM FOR HYDRAULIC PRESSURE DRIVEN VEHICLE PROVIDED WITH GEAR TYPE TRANSMISSION
Document Type and Number:
Japanese Patent JPS62278366
Kind Code:
A
Abstract:
PURPOSE:To avoid shocks upon engagement of a clutch, by making the input and output side rotational speeds of a clutch coincident with each other before engagement of the clutch when a gear type transmission is shifted, and thereafter, by engaging the clutch at the moment at which both rotational speeds coincide with each other. CONSTITUTION:When the driver manipulates a change-over switch 14, the voltage applied to a terminal of a controller 13 varies, and therefore the controller 13 discriminates a speed change instruction. Further in the case of no possibility of speed increasing shift or overrun, a direction control solenoid valve 10 is set at its neutral position, and therefore, all clutches are raced. Further, the difference in rotational speed between the input and output of the clutch is calculated in accordance with signals from rotational speed detectors 6, 7, and therefore, an electrohydraulic control valve 5 is controlled in accordance with the above-mentioned difference to change the displacements of both variable displacement pump 1 and motor 4 by means of serve-valves 2, 3. Further, at the moment at which both input and output rotational speeds coincide with each other, a direction control solenoid valve 10 is actuated to engage the clutches.
Inventors:
TAKEDA AKIO
Application Number:
JP12016286A
Publication Date:
December 03, 1987
Filing Date:
May 27, 1986
Export Citation:
Assignee:
KOMATSU MFG CO LTD
International Classes:
E02F9/20; B60W10/02; B60W10/10; F16D25/00; F16D48/02; F16H47/02; F16H61/02; F16H61/08; (IPC1-7): B60K41/22; E02F9/20; F16D25/00; F16H47/02
Domestic Patent References:
| JPS56127843A | 1981-10-06 |
Attorney, Agent or Firm:
Matsuzawa Osamu