Voith DIWA Voith Diva Automatic Transmission (3)
Technical Service VoithD丨WA Voith Diva Automatic ç¦ Voith Drive Technology Systems (Shanghai) Co., Ltd. Feeding Cars and Accessories†Commercial Vehicle Engine CVE (No. VoithDIWA.3E Voith Diva 3rd Generation Automatic Transmission. 1st gear. It is also the DIWA Diva gear. The differential planetary gear unit and the reversible torque converter are used to divide the power into two channels of hydraulic and mechanical transmission for starting. Acceleration and large drag conditions or slow speed. The torque ratio of the first gear is large. There is mechanical transmission power at the start. There is a wide stepless shift range, and there are good driving characteristics. See 4. Slow down when there is no need to downshift. Strong retarding ability. No wear The name DIWA is composed of the first two letters of the differential and the winder (Wandler), which means that the transmission of the DIWA Diva gear is performed by both the hydraulic and mechanical channels.
In order to facilitate the control of the retarding force, the retarding force is divided into three levels, which are controlled by the driver through a manual retarder switch or in conjunction with the brake pedal. Since the torque converter is always filled with oil, the slow response is fast. Have a good slow speed feature, see 5. The slow speed function is automatically released before the ABS works.
When the vehicle is suspended (or stationary). The power between the engine and the transmission is automatically separated. Voith is defined as automatic neutral (ANS, about 20%~40% of the total running time of the city bus in the city of Autowatic NeutralatStandstill is suspended (stop, wait for traffic lights, meet the road) If the power is not automatically separated at this time, the torque converter will consume a certain amount of power. This will cause the fuel consumption to increase at the idle speed. This incremental consumption is about 2~3L/h, of course. Consumption and starting idle speed The speed is related to the transmission structure. The DIWA.3E 3rd generation automatic transmission is achieved by automatically separating the input clutch when the vehicle is suspended. The control system interrupts the output of the transmission and the vehicle can be stopped after a little braking. In no-load idle speed. As for the automatic neutral position under what circumstances, it can be set when the running speed is lower than 1km/h. The accelerator pedal is in the idle position (L), when the brake is active. This process is E200 control system Controlled. This improvement can save fuel by 1.5L/100km by using the torque converter part of the oil filling method to solve the problem that the vehicle is impacted by the pause (stationary) acceleration. For the working process of the transmission, see 6. When the parking brake is activated, see 7. 2. The electronic control system of the electronic control system is mainly composed of E200 electric control device and gear selector switch. Manual retarder switch. Slow speed associated with the brake pedal. Switch, emergency acceleration switch, sensor (load sensor, temperature sensor, speed sensor, etc.), solenoid valve, relay, interface, etc. The PC for fault diagnosis is only reading the composition of the E200 control electronic control system and the schematic diagram arranged on the vehicle. See 8.) The transmission control system consists of the following components: Direct selection according to the driver's wishes.
The E200 electronic control unit is equipped with two microprocessors. The main microprocessor (host computer) and the safety microprocessor (safety computer) are the central components of the transmission control system. Thanks to its modular design, software and user-defined data, it can easily adapt to the required vehicle (engine, rear axle speed ratio, etc.). The control system processes signals from sensors and other systems (eg, ABS). And convert to appropriate signals to the transmission and other vehicle systems. If necessary (for example, controlling the torque of the engine when shifting), use two connectors for the side of the transmission and one side of the vehicle as inputs and outputs.
The electrical switch commands are converted to hydraulic forces that propel multiple clutches and brakes.
The change in the physical quantity of the speeder.
The appropriate vehicle control of the control system is through data that is specifically entered and stored in the memory of the control system. During the entire life of the transmission.
This data stabilizes the transmission information and the shift points of the automatic shifting program. Accurately switch to a higher gear or a lower gear. This data also gives input and output errors for other vehicle systems. The diagnostics provided by Voith can also be used to re-enter data into the control system.
The shift is controlled based on the torque of the engine and the input speed of the transmission and the output speed r. Monitor the synchronization time S and brake during shifting. Optimize shifts.
If there is a deviation in the shift point, the program will calculate the subsequent shifting process, which is known as adaptive shifting. To compensate for manufacturing errors. Wear and tear. Parameter changes caused by temperature, etc. Solenoid valves are required to be controlled separately. Guaranteed high quality shifts, regardless of time, also increase the life of the transmission.
There are two selectable shifting programs (choose one) that are entered into the control system: the acceleration-related shifting program, which adapts the vehicle characteristics to the changing driving conditions. Such as road conditions and load changes (strongly recommended).
B. A fixed shift point program that can be determined by the user.
The control of the torque converter pressure in the reverse gear controls the torque converter pressure in the reverse gear. Ensure that the engine drives the vehicle at the optimum speed range.
The retarder of the torque converter must react quickly and without impact, which is achieved by measuring the slip time of the reverse speed brake (RB) friction lining by measuring the rotational speed n3 on the outer gear ring of the worm gear. The synchronization process is determined and preferably controlled by the control system software.
The torque converter oil control improves the excitation of the torque converter, even when the vehicle is running at high speed in the IV (and possibly 111).
The torque converter pressure and the corresponding retarding torque are adjusted to the relevant speed value.
The torque converter can be retarded by the brake pedal. Use (start). If the vehicle has ABS installed and the control system is connected. Then, when the ABS is running, the torque converter is slowly turned off. In order to prevent the impact of ABS work.
The failure of the transmission can be stored in a memory in the control system. It can be read by PC or light signal with the use of Voith DIWAGNOSIS software. Simultaneously. It is possible to collect the main operational data for a long period of time. After the statistical evaluation, it shows that it is important to maintain and reduce the maintenance time.
For security reasons, the control system sets up two computer channels. That is to say, the security key is monitored by a second computer-secure computer.
If the vehicle has a serious fault. Accidents such as rear axle obstacles or high acceleration travel. These drivers do not want to happen. You can press the key of the selector switch. The transmission control system forces the vehicle into a safe state.
The control system is capable of its own main components as well as all sensors and solenoid valves. Check whether the incentives and future work are normal.
The detection of any faults in components, sensors, solenoid valves and transmissions is handled by the control system under the concept of a state failure. This concept is the highest principle of transmission applications. This means limiting the operation at the time of the failure as little as possible. The faults are divided into four levels: A. B, C, and D. (To be continued)
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