1. Roles of components
The gears are shifted by switching the operation of the clutches and brakes. The shift valves switch the fluid passage that causes the hydraulic pressure to be applied on the (more…)
Automatic Trans
Other types of Automotive Controls
1. Line pressure optimal control
The ECT uses a throttle position sensor to detect the accelerator opening angle (load) and control the line pressure. The line pressure is controlled by using a linear (more…)
Control of Lock-up
The Engine & ECT ECU has programmed in its memory a lock-up clutch operation pattern for each driving mode. Based on this lock-up pattern, the ECU turns the solenoid valve on or off in accordance with (more…)
Main Controls Description
The Engine & ECT ECU performs the following controls.
Control of shift timing
Control of lock-up
Control of flex lock-up
Other controls
The ECT vehicle can be driven smoothly and comfortable (more…)
Shift Lever Lock Mechanism
Shift lever lock systems are adopted to prevent mis-operation of the shift lever. With this mechanism, when the shift lever is in the “P” range, the shift lever cannot move unless the ignition key is in (more…)
What is Sensors/Switches?
The sensors/switches play the role of collecting the types of data used to determine the various controls, and convert them into electrical signals, which are then transmitted to the Engine & ECT ECU. (more…)
Operation of Automotive Gear Shift
Each gear condition is explained using the solenoid valves and shift valves.
1. 1st gear
For gear shift from neutral to 1st gear, the fluid passage to C1 is opened by switching the manual valve. (more…)
What is a Valve Body?
The valve body consists of an upper valve body, and a lower valve body. The valve body resembles a labyrinth, containing many passages through which the transaxle fluid flows. Many valves are built into (more…)
Major Components of Oil Pump
The oil pump is driven by the torque converter (engine) to supply the hydraulic pressure that is required for the operation of the automatic transaxle.
HINT:
Use the dipstick for fluid level inspection, (more…)
Hydraulic Control Unit
The clutches and brakes that operate the planetary gear unit are operated by hydraulic pressure. The hydraulic control unit generates and adjusts this hydraulic pressure and switches its passage. The illustration (more…)