AMT Deflect handle detector design

 

[Hippocampus (Zhengzhou) Automobile Co., Ltd., Henan Zhengzhou 450016]

 

    About the AMT Deflect past detection system needs to handle the control box, the entire AMT harness, PC, in the communications software interface, the operation is relatively cumbersome and complex, this design To address the AMT Deflect handle automatic mode and manual mode, the correct gear of detection, need to use the knowledge to make a simple chip detector buzzer on display and digital display, the detector inside each control circuit, an external data lines drawn with the AMT has allocated block connector on the handle, so able for automatic mode and manual mode signal detection, if the manual mode toggle "+" "a" followed by the alarm buzzer signal, if the automatic mode toggle "D, N, R, P" to digital display the corresponding AD values, you can prove that the instrument design is complete, test success.

 

1 AMT and its characteristics

 

    In accordance with the implementing agencies of different power source, you can choose the AMT shift operation system is divided into electro-pneumatic, electric control hydraulic and electric control motor (also known as all-electric) three types.

 

1.1 electrically controlled pneumatic AMT

 

    AMT using pneumatic gas source to increase the gas pressure control solenoid valve to turn on or off the gas path, thereby performing the functions of the body. Has a small mass, the impact of small, low cost, large driving force, no pollution and other advantages. However, the power transmission needs gas piping, structural complexity, and easy to leak gas, poor sealing, noise, and other shortcomings. Furthermore, the volume of the gas compressibility sacrifice, the shift speed becomes slower. Only when there is a large pneumatic systems for heavy vehicles such as buses or special models to apply, is not universal. This drive is now rarely used.

 

1.2 electrically controlled hydraulic AMT

 

    AMT was acting according to the directives issued by ECU control solenoid valve on or off oil, to perform the functions of the agency. With energy capacity, easy to operate, easy to implement security protection, with some vibration and shock-absorbing capacity and ease of spatial arrangement and so on. Its main drawback is the use of high-speed switching valve control clutch system, the temperature change in the clutch actuator hydraulic oil viscosity changes, affecting the accuracy of the implementing agencies. The lower the temperature, the worse the flow of hydraulic oil, the impact with the clutch speed, lower shift quality. Second, hydraulic components for machining precision is very high, generally difficult to machine manufacturers, the cost is high.

 

1.3 electronically controlled electric AMT

 

With the automotive and electronics industry continues to evolve to meet the increasingly high modern car power, economy, safety, comfort and emissions requirements, electronic control technology is increasingly widely used, technology matures , increasing the degree of automotive electronics. In the variable speed motor control system using a power source as the executing agency, replacing the shifting and clutch manually complete separation and combined manipulation. Compared with electrically controlled hydraulic AMT has many improvements:

 

(1) Cancel the hydraulic system, the entire control system is more simple weight.

 

    (2) instead of the hydraulic actuator motor, to improve the control precision, reducing the system malfunction, the control method is more simple. Electric control

 

    AMT execution in the electric motor is characterized by: controllable, fast response, reliability, and adaptability to the environment: small size, easy installation and low cost. But the shift quality as electro-hydraulic AMT, shift time is longer, the software can be improved to some extent.

 

    With the implementation of the continuous improvement of motor performance, electronically controlled electric AMT shift quality will be further improved.

 

1.4 Hybrid AMT

 

    For humans can live a better life, to achieve sustainable development, governments are actively looking for new technologies to improve the use of vehicles brought by the traditional energy shortage and environmental pollution. Hybrid electric vehicle (HEV) is when the garland the best way to solve the above problems, the Chinese government in 2004 promulgated the "automobile industry development policy" that countries have taken measures to focus on the development of hybrid vehicle technology, to promote the production and hybrid cars be used. Hybrid cars are highly integrated, multi-system coordination integrated control system. To meet the hybrid electric vehicle energy affects the automatic coupling, hybrid vehicles adapted to meet different requirements of driving conditions, thus improving vehicle economy, power and improve emissions quality, used by the electronic control unit ECU controlled automatic transmission has become inevitable. Based on the development cycle, development costs and vehicle layout considerations, in the original manual transmission developed on the basis of the AMT program is undoubtedly the best solution.

 

The basic principle 2 AMT

 

    Captive gearbox is to achieve a level gear transmission mechanism, with high efficiency, low cost, mature production technology, etc. have been widely used in various vehicles. Such transmissions shift when there is labor-intensive operation, power interruption, the driver driving the vehicle on the level of performance has great influence on other defects. Computer technology, electronic technology and control theory to these questions provide a solution. AMT use advanced electronic technology to transform traditional manual transmission, shift and clutch combination to achieve the automatic execution.

 

    The accelerator pedal by the driver and a selector (including the selector range, shift schedule, cruise control, etc.) express intent to the ECU, engine speed, input shaft speed, vehicle speed, gear, throttle opening degree sensor such as real-time monitoring engine operating conditions, and military vehicles operating conditions, and the corresponding electrical signal input ECU (ELECTRONICS CONTROL UNIT), ECU stored therein according to pre-set by an analog skilled driver's driving rules (best shift schedule, the best combination of rules clutch , engine throttle adaptive law, etc.) the accelerator opening degree, and the shift clutch is three controlled to achieve the engine, clutch and gearbox best match, thereby obtaining an excellent driving performance, stable performance and rapid shift start capacity.

 

    The full realization of vehicle electronic control systems and to ensure good performance and reliable operation of the vehicle.

 

    Good control system software pre-written and stored in the ECU, including start shifting the use of functions and data tables, stalls decision started, shifting, braking and other control procedures, data acquisition and processing procedures.

 

3 Development and current situation at home and abroad AMT

 

    Domestic AMT of a late start, began in the mid 1980s, supported by the National Natural Science Foundation of China, "fifteen" during the national "863" plan and other major research support. There are many domestic units are being actively developed by AMT hardware and software systems.

 

    "Dynamic three-parameter optimal shift schedule", "dynamic closed-loop control technology", "adaptive control technology" and "fuzzy control technology" and other theoretical aspects of the automatic transmission in a leading position in the world. AMT is accelerating the process of localization; According to reports, March 10, 2006 by the Beijing Gear Works independently developed with independent intellectual property rights of electronically controlled automatic transmission delivered to users. For this automatic transmission, some experts said, the North tooth AMT product applications will be more help to improve the quality of automotive products, and promote the original clutch manual transmission plants and plant development, which contains all the high-tech products with a more high price-hoot, can produce good social and economic benefits, but also will accelerate the design and development of China's own process of automatic transmissions for our car development to make a positive contribution.

 

    Study abroad in the AMT is also gone from research to product applications, improved, and development to improve the process,

 

Finally achieve commercialization. Especially in recent years, with control technology and the rapid development of electronic information technology, AMT

 

Technology in foreign countries, whether design, technology or product quality level, there has been a leap development. Currently, the most advanced

 

The AMT is a CAN bus as a link. Highly integrated automatic transmission systems that test module, retarder with assisted braking

 

Systems. The torque converter, transmission, retarder, record driving conditions and troubleshooting capabilities designed to integrated, intelligent

 

There are class mechanical automatic transmission. Its biggest advantage is reflected in the reliability, fuel economy and integration with the environment and other Morokata

 

Hand, is an integrated T EDC (electronic diesel engines), AMT (electro-mechanical automatic transmission), CAN bus, etc.

 

Advanced technology of the new drivetrain.

 

4 AMT dial gear lever

 

    AMT Deflect Deflect handle on the handle both manual and automatic mode, manual mode with a "+", "one", respectively,

 

That the increase, downshifts; auto mode has "D, N, R, P" representing Automatic, idle gear, reverse gear and parking

 

Block, which has a dial on the handle block reverse gear lock button, when in manual mode state, press this button will automatically next

 

Back empty, in automatic mode, gear appropriated from idle reverse gear, gear when parking only need to press the access key. When the shift

 

When the received signal from the Hall sensor feedback to CPU, cars react accordingly.

 

5 AMT Deflect handle detector design

 

5.1 AMT Deflect handle detector design

 

    Produce a detector, surface mounted buzzer with digital display (LED), which is used to detect the buzzer signals from the manual mode, manual mode if the signal is coming from, then issued a "tick" sound; digital display automatic mode is used to detect the signal, if the signal coming from the automatic mode, then display the corresponding values. Detector internal microcontroller, external leads AMT Deflect data cable connected to the handle, for testing.

 

5.2 Buzzer

 

5.2.1 buzzer function, classification and representation symbols

 

    (1) Function: Buzzer is an integrated structure of electronic transducers, DC voltage supply, widely used in computers, printers, copiers, alarms, electronic toys, automotive electronic equipment, telephones, timers and other electronic products in the sound generating device.

 

    (2) Category: Buzzer Piezo buzzer and consists of electromagnetic buzzer types.

 

    (3) the buzzer circuit pattern symbols in the circuit by the letter "H" or "HA" (old standard with "FM",

 

"LB", "JD", etc.) indicates.

 

5.2.2 buzzer structural principle

 

    Piezo buzzer mainly by multivibrator, piezo buzzer, impedance matching and resonance box, casing and other components. Some piezo buzzer case is also equipped with light-emitting diodes.

 

    Multivibrator constituted by the transistors or integrated circuits. When switched on (1.5. 15V DC working voltage), multi-harmonic oscillator start-up, the output 1.5 ~ 2. 5kHZ audio signal, impedance matching din promote piezo buzzer sound. Piezo buzzer by a lead zirconate titanate or lead magnesium niobate piezoelectric ceramic material. Both surfaces of the ceramic sheet plated silver electrode, the polarization and the aging treatment, and then with brass or stainless steel sheet stick together.

 

5.3 Digital Tube

 

5 Introduction 3.1 Digital Tube

 

    The digital control of eight digital tube, each bit segment is a light-emitting diode, an eight digital tube respectively, by a, b, c, d, e, f, g-bit segments, plus a decimal point bit segment dp, But this detector uses only use seven-segment digital tube, decimal who vacant. Light emitting diode unit is connected by way into common anode and common cathode LED digital tube. Common anode LED refers to light emitting diode anode connected all together to form a common anode (COM) digital control. Common anode tube should be applied in the public received very COM +5 V, when a field emission cathode of the diode is low, the corresponding field on the light. When a field cathode is high, the corresponding field is not bright. Common cathode LED refers to light emitting diode cathode connected all together to form a common cathode (COM) digital control. Common cathode LED should be applied in the public pole connected to ground GND COM, when a field of light-emitting diode anode is high, the corresponding field on the light. When the anode of a field is low, the corresponding field is not bright.

 

5.3.2 Dynamic Scan

 

    Digital display board a total of eight digital tube, according to the traditional digital control drive (static scan mode), you need eight seven segment decoder to drive, such a waste of resources, and sometimes unreliable circuit operation. So now the most common digital tube driver circuit has no static scan mode of the above, instead of using dynamic scan showed love the way, this way only a decoder can achieve normal circuit, reliable work, thus saving resources. Dynamic digital scan display mode is the use of human visual persistence effect, the eight digital tube in a certain order (from left to right or right to left) for lights lit when the frequency (ie, scanning frequency) does not large, we see one digital tube lighting, however, when the operating frequency is large enough, we see no longer light up one by one, but all at the same time display (lit), and the traditional way to get exactly the same visual effect. So we just give this a digital scanning frequency, it can achieve more than two digital tube lit simultaneously. And this frequency we can generate a counter, just counting frequency is large enough, we can achieve our requirements. In fact, because digital tube lights can not instantaneous, it also requires a certain period of time, the time and the choice of digital control of a relationship. To compromise this contradiction, the experiment will generally be counted frequency selection at about 100Hz certainly meet these two requirements.

 

(10) Continuous communication interface module;

 

(11) System Management Bus (SMB us), version 1.011.1 (dual control IIC bus);

 

(12) with 4-channel auto scan mode 14-channel 10-bit analog to digital converter (ADC);

 

(13) with programmable amplifier current sensor;

 

(14) temperature sensor (- 200C to +700 C);

 

(15) IRQ1 external interrupt input pin has an internal pull-up resistor;

 

(16) IRQ2 external interrupt input pin with programmable pull-up resistor;

 

(17) 8 keyboard wakeup interface and has an internal pull-up resistor;

 

(18) 31 General Purpose Input Output (I / O) pins, two dedicated pins;

 

-31 Root share function I / O pin;

 

-2 Root dedicated output mode pin.

 

(19) Low Power Design (with stop and wait modes fully static mode);

 

(20) controls the reset pin (with programmable pull-up resistor);

 

(21) System protection features:

 

- Any computer operating properly reset (COP);

 

- Any low-voltage detection reset;

 

- Reset detect illegal code;

 

- Reset detect illegal address.

 

(22) 48 pin quad flat package (LQFP) and 42-pin shrink dual in-line package (SDIP);

 

(23) has a 42-pin SDIP MC68HC908SR12 specific characteristics:

 

- Only 29 general I / O pin;

 

- Only 11 ADC channels.

 

6 Conclusion

 

    World advances in technology, while oil, natural gas and other resources are becoming scarce, so the car's power, fuel economy, emissions, and a higher comfort requirements. Research on the automatic transmission, automatic transmission as hydraulic mechanical (AT) is technically very mature, without the automatic transmission (CVT) transmission belt of the car there is strength and life issues, so we automated mechanical transmission (AMT ) study is of great practical significance. Although the present automatic mechanical transmission (AMT) technology is not very mature, but it has a lot of advantages and great potential for development, I believe, automatic mechanical transmission (AMT) - will make significant progress.