Major Controller Functions - Toyota 7FBEF 15 Service Manual

I Major controller functions
1. Two traveling motor control
Two independent AC drive systems are adopted for controlling the motors for front wheels LH and RH.
The outputs from motors LH and RH are controlled according to the steering angle for smooth
operation.
2. Accelerator-off regeneration braking
Regeneration braking is provided to regenerate the electrical braking energy into the battery when the
accelerator pedal is released during traveling. This will extend the operable hours, lengthen the brake
lining life and realizes easy, stable traveling with engine-brake-like feel. This function is active even
when the direction switch is in the neutral position.
3. Brake Pedal Regeneration Braking
Regeneration braking also functions upon ordinary braking to extend the operable hours and lengthen
the brake lining life. This function is active even when the direction switch is in the neutral position.
4. Switch-back regeneration braking
Regenerating braking also functions at the time of switch-back operation.
Smoother operation feel is obtained than on previous models.
5. Power keep function
The performance is maintained even when battery discharge proceeds for longer efficiency operation
hours. (Only when the P or S mode is selected.)
6. Power select function
The traveling/material handling mode is selectable from H, P and S by button operation on the multi-
screen display.
7. Power control select function
The traveling/material handling performance mode setting and performance setting to other than H, P
and S are possible by operation on the multi-screen display.
8. Auto-off function
If the vehicle is left with the key switch kept at the ON position, the controller forcibly turn the key
switch off for power saving. To use the vehicle again, turn the key switch to OFF and ON.
9. Deadman Switch Function
Traveling is disabled while the operator is not on the seat.
10. Anti-rollback function
The anti-rollback function is provided for easier starting on a slope.
11. Traveling speed limiter
The traveling speed is limited to the maximum level set with the multi-screen display.
12. Thermal protector
The temperature sensor installed in each controller/motor informs the operator of temperature rise to
the specified level by indication on the multi-screen display and restricts the controller output for
protection.
13. Remaining battery charge calculating function
The battery voltage drop by discharge is detected and calculated by the controller for indication of the
remaining charge on the multi-screen display.
14. Diagnosis function
Any abnormality in the operating systems like the motor driver and accelerator or any sensor
abnormality is detected for indication by respective code on the multi-screen display, and a necessary
action is taken.
15. Analyzer function
When the multi-screen display is in the analyzer mode, defective part detection and functional check of
each operating system and motor driver are possible.
16. Over-discharge warning function
When the remaining battery charge drops below the specified level, it warns on the multi-screen
display and material handling during traveling is disabled. This function protects the battery and inform
the operator of the need to charge the battery.
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