TH36052A - Control equipment for powertrain in vehicles operating by hydraulic system - Google Patents

Abstract

In the DC60, when switching to forward mode while the vehicle is traveling in reverse, the switch to forward mode is made very quickly. This is to prevent wear and tear on hydraulic interlocking components due to slippage. For this purpose, when the vehicle speed (V) exceeds the preset value (YVa) in reverse (R), and also when the vehicle speed (V) never falls below the preset value (YVa) in neutral (N), a reverse signal (FREV = 1) is output. If FREV = 1 at the time of switching to forward mode, the relationship between vehicle speed and speed step (speed shift diagram) is set to one (speed shift diagram measured in reverse), different from the normal time. This is to determine which speed step to generate. In the later stages, a low speed step is generated even at high vehicle speeds. Therefore, the switch is made very quickly to forward mode with a large torque being transmitted through the low speed step via the sensor. This system can detect the vehicle's true direction, whether it is forward or backward. The speed shift scheme measured during reverse movement is selected as the speed shift scheme when the vehicle's direction to be detected during forward movement is reverse. When switching to forward movement while the vehicle is moving in reverse, the switch to forward movement is performed rapidly. This is to prevent wear and tear on the hydraulic interlocking components due to slippage. For this purpose, when the vehicle speed (V) exceeds the preset value (YVa) during reverse (R), and also when the vehicle speed (V) never falls below the preset value (YVa) during neutral (N), a reverse signal (FREV=1) is output. If FREV=1 at the time of switching to forward movement, the relationship between the vehicle speed and the speed step (speed shift scheme) is set to one (speed shift scheme measured during reverse movement), different from the normal time. This is to determine which speed step to be created; in the later stages, a low speed step is used. It will be generated even at high vehicle speeds, so the switching is done quickly to the forward state, with large torque being transmitted through the low-speed phase using a receiver that can detect the vehicle's actual direction—whether it's forward or backward. The speed change scheme measured from reverse movement will be selected as the speed change scheme when the vehicle's direction of movement detected during the forward phase is in reverse.

Claims (3)

1.Control device For a power transmission in a vehicle operating by a hydraulic system There are a number of velocity stages to be created by performing a selection of hydraulic overlapping parts. That has been made special by that Such device It contains: Method for detecting vehicle speed. For detecting the speed of the vehicle; Forward detection method For detecting that transmission is in the forward phase; The decisive method determines the velocity at the forward run. For determining speed limits In the state of running forward In the forward Depending on the speed of the vehicle; How to detect reverse run For detecting that the vehicle is in reverse state; And the method of deciding speed At reverse run For determining speed limits In the state of running backwards In the forward Depending on the speed of the vehicle; 2. Control device According to claim 1, it still includes: the reverse detection method. For detecting that The transmission is in reverse; Method for detecting the neutral gear For detecting that Power transmission In the neutral gear; Whereby the method for detecting such running back Will separate at the time of switching from the reverse period Go to the forward phase through the neutral gear The vehicle is in reverse running condition In the forward When the speed of the vehicle in reverse Is greater than the first predetermined value and is additionally when the vehicle speed In the neutral gear Never falls below the second preset value 3. Control device According to claim 2, which still includes; Method for creating a reverse period When the vehicle speed has fallen lower Preset value At the time of switching from the forward phase Go to the reverse phase and method for prohibiting For prohibiting the separation of such characteristics By the mechanism to detect the said run back When the reverse velocity step is not created in the reverse phase.