Automobile DTC and BTC

1. Good morning, BMW's DTC system is a dynamic stability system. There are many reasons for the failure of the DTC system. I suggest that you use the computer to test the fault content, find out the reason and solve the problem. 4S shop professional technician, 10 minutes to solve

2. Among BMW's models, the 6-series is relatively unfamiliar to us. In fact, the 6-series was launched in 1976 and stopped proction in 1989. During this period, the 6-series sold 86000 cars, making it the most successful box car in BMW's history. Maybe it's the relationship between the ages that has become blurred, but BMW has not forgotten this classic model that has brought them good memories. After 14 years, BMW decided to resurrect the 6-series and get involved in the large luxury sports car market again. In terms of exterior design, the 6 series maintains the typical dynamic style of BMW coupe. The long hood, low roof line, front face and side skirt give the car a dynamic and elegant posture. In order to be different from other models, the headlamp, the engine cover, the water tank grille and the forward air outlet are all completely new designed. In the tail lamp design, the introction of new elements such as LED stop lamp, in addition to greatly shorten the reaction time, but also according to the different environment to adjust the size and brightness, more originality. In terms of power, the 6-series will adopt a 4.4-liter engine with Valvetronic technology, which is the heart of BMW 745i luxury car. The V8 engine speeds up only 5.6 seconds from 0-100 km, and its top speed is limited to 250 km / h electronically. The engine has a maximum horsepower of 333 HP and a maximum torque of 450 n / m. There are three options for the transmission matched with the engine. It is BMW's usual style to transmit power to the rear wheels. In addition to the manual 6-speed transmission, the new BMW 645ci also provides a 6-speed automatic transmission with steptronic function. If users prefer the shift mode like F1, they can also choose the sequential manual transmission (SMG), which can be shifted by the paddle or gear lever on the steering wheel. BMW has always been famous for its advanced technology development. The application of a series of high-tech projects has kept BMW in a leading position in the automotive instry. The Sixth Department has also adopted many advanced scientific research achievements. The body length of the new 6-series is 4820 mm, and the width is 1800 mm, which is wider than that of the 5-series. Such a large body shape is bound to increase the weight of the body, and excessive body weight will greatly affect the acceleration and control of the 6 series. For this reason, BMW uses a lot of aluminum alloy and composite materials on the body of the 6 Series in order to rece the weight. Carbon fiber reinforced plastic is 50% lighter than steel and 35% lighter than aluminum, which can effectively rece the weight of car body. The rigidity is three times of other materials, and the crashworthiness and safety are very good. It has always been the ideal material for the automotive instry. However, e to the lack of stamping equipment, carbon fiber can only be proced by hand before. Now, BMW has developed a set of stamping equipment with a weight of 200 tons and a pressure of 1800 tons, which is the first batch proction of carbon fiber roof in the world, and has begun to use it on the new 6 series. The 6-series also uses the head up display (HUD) system which is only used on the vehicle. The HUD can project some main information directly onto the windshield, including navigation direction, speed and active cruise control display. The core functions related to driving in the car are operated by the I-Drive controller and the buttons near the steering wheel, but the control button of I-Drive is placed on the right side of the gear lever, which needs to be straightened. Other secondary functions and the control of comfort equipment are arranged in a place easily accessible to the driver and front seat passengers, which is very convenient. Users can also choose a panoramic glass roof which is much larger than the ordinary electric skylight, so that more sunlight can enter the luxurious interior of the car. Dynamic driving and active steering system are optional equipment of 6 series, which can eliminate the body roll caused by vehicle turning to a great extent and increase the comfort of passengers in the car. The active steering system changes the steering ratio through a stepper motor according to the vehicle speed. When the vehicle speed is low, the steering sensitivity increases, and only a small angle of the steering wheel is needed to obtain a larger wheel steering. This situation is very useful for drivers driving on urban roads or parking and turning around. When the speed increases, the steering will become more accurate to ensure the driving stability and comfort. Equipped with dynamic stability control (DSC) and dynamic traction control (DTC) system. In addition, the driving dynamics control (DDC) technology used in BMW M3 and M5 models is also used in the new 6 series, which is controlled by a "Sport" button on the center console. DDC function can increase the response sensitivity of the throttle, improve the acceleration ability, and make the power assisted steering mechanism get a more direct response, so as to increase the driver's driving pleasure. In terms of power, the 6-series will adopt a 4.4-liter engine with Valvetronic technology, which is the heart of BMW 745i luxury car. The V8 engine speeds up only 5.6 seconds from 0-100 km, and its top speed is limited to 250 km / h electronically. The engine has a maximum horsepower of 333 HP and a maximum torque of 450 n / m. There are three options for the transmission matched with the engine. It is BMW's usual style to transmit power to the rear wheels. In addition to the manual 6-speed transmission, the new BMW 645ci also provides a 6-speed automatic transmission with steptronic function. If users prefer the shift mode like F1, they can also choose the sequential manual transmission (SMG), which can be shifted by the paddle or gear lever on the steering wheel. As for the interior, we always have full confidence in BMW. The 6-series adheres to the consistent style of BMW,

3.

DTC is a dynamic tractive control button, a dynamic traction control button, which controls the tire traction by controlling the engine speed

DSC is the abbreviation of dynamic stability control, that is, dynamic stability control system. In case of emergency cornering, emergency acceleration and emergency braking, the vehicle can quickly sense and take corresponding braking measures, such as controlling each tire separately, recing the output of the engine and maintaining the stability of the body

it takes at least 12 minutes to complete all items detection of the whole system, and the detection requirements of dbd-11 must be followed in these 12 minutes: idle speed, acceleration, cruise, re acceleration, re high speed cruise, non braking taxiing and other specific conditions. This continuous condition detection is called an obd-1i1 drive cycle or 15 condition

extended data:

function

(1) in case of emergency braking, ABS can prevent wheels from locking up; When the wheel slips, TCS controls the engine output and wheel braking to prevent the wheel from slipping

(2) the body stability control system uses the computer to control the output of the engine and the braking of any wheel (the braking force can be divided into large and small) when the vehicle makes a quick turn, dodges or gives way to a car or animal that suddenly rushes out, In order to eliminate the phenomenon of understeer or oversteer and improve the driving dynamic stability

(3) the simple comments on the functions of ABS, TCS and ESP in Bosch website are: safe braking, accelerating without wheel slip and counter slips skipping

4. One is that the car is automatically detecting the fault code, that is, detecting whether the direct torque control is out of order
in direct torque control, the amplitude of stator flux is maintained at the rated value through the vector control of the above voltage. To change the torque, the angle between stator flux and rotor flux can be controlled. The angle can be adjusted by the control of voltage space vector. Since the rotation speed of the rotor flux remains unchanged, the angle can be adjusted by adjusting the instantaneous rotation speed of the stator flux
if the actual torque is less than the given value, select the voltage vector to rotate the stator flux in the counter clockwise direction, so that the angle increases and the actual torque increases. Once the actual torque is higher than the given value, select the voltage vector to rotate the stator flux in the opposite direction. This causes the angle to decrease. By selecting the voltage vector in this way, the stator flux linkage rotates all the time, and its rotation direction is determined by the torque hysteresis controller
extended data:
principle
in direct torque control, the amplitude of stator flux linkage is maintained at rated value through vector control of the above voltage. To change the torque, the angle between stator flux linkage and rotor flux linkage can be controlled. The angle can be adjusted by the control of voltage space vector. Since the rotation speed of the rotor flux remains unchanged, the angle can be adjusted by adjusting the instantaneous rotation speed of the stator flux
assuming that the motor rotor rotates counterclockwise, if the actual torque is less than the given value, the voltage vector that makes the stator flux rotate counterclockwise is selected. As the angle increases, the actual torque increases. Once the actual torque is higher than the given value, the voltage vector is selected to make the stator flux rotate in the opposite direction. This causes the angle to decrease. By selecting the voltage vector in this way, the stator flux linkage rotates all the time, and its rotation direction is determined by the torque hysteresis controller
the torque and flux linkage of direct torque control are controlled by hysteresis comparator. The operation principle of the hysteresis comparator is: when the error between the current value and the given value is within the tolerance range of the hysteresis comparator, the output of the comparator remains unchanged. Once it exceeds this range, the hysteresis comparator will give the corresponding value
the principle block diagram of direct torque control is as follows: the given speed is compared with the estimated speed to obtain the given torque; The torque difference is processed as hysteresis loop by the torque regulator to get the torque control signal; The flux estimation is compared with the given flux, and the flux control signal is obtained by hysteresis comparator; According to the calculated rotor displacement, the sections are divided; According to the section, torque and flux control signals, combined with the look-up table, the space vector is obtained and the PWM wave is generated; Output to inverter, power supply to motor

reference source: Network - Direct Torque Control

5.

Automobile DTC means: diagnostic trouble code (DTC). Under the condition of not disassembling (or only removing indivial parts), determine the technical condition of the vehicle, find out the fault location and cause inspection

includes the detection and diagnosis of automobile engine, chassis, body and accessories, exhaust pollutants and noise

according to the requirements of OBDII, the fault code DTC is divided into different types according to the monitoring system and the severity of the fault. Different types have different requirements for the set code

and the diagnostic execution command only makes the engine fault lamp mil on when there is an emission related DTC (which may exceed 1.5 times of FTP). DTC is divided into four categories, including A.B.C and D. among them, a and B are related to engine emission level

extended data:

DTC is divided into four categories, including A.B.C and D, in which a and B type of DTC is related to engine emission level

class A: monitor the diagnosis ring the first trip, report "fault detected" to the diagnosis execution command, store the DTC and turn on the mil lamp

class B: run the diagnostic test related to the emission level in the first continuous stroke, report "fault detected" to the diagnostic command, store the DTC and light up the mil. After the fault is detected for the first time, the type B fault code will enter the preparation, and then the type B fault code will be in the alert state, or ready to store a history code

if this fault occurs again, the mil will light up; On the contrary, a passing test will remove the alert state of the system to class B DTC. Some special conditions will be used for the fault code DTC of misfire and fuel adjustment

class C: run the non emission related diagnostic tests ring the first trip, report "fault detected" to the diagnostic execution command, store the DTC and turn the vehicle maintenance light on; SERVICE VEHICLE SOON"
if equipped, light up

class D: run non emission related diagnostic tests ring the first trip and report to the diagnostic execution command“ If a fault is detected, class D will store the DTC without lighting up the mil lamp. These DTC codes will be very helpful for the maintenance and diagnosis of the vehicle, especially when the driver points out some performance degradation and the mil is not lit

source of reference: what is the fault of automotive technical maintenance network DTC

6.

One is that the car is automatically detecting the fault code, that is, detecting whether the direct torque control is out of order

in direct torque control, the amplitude of stator flux is maintained at the rated value through the vector control of the above voltage. To change the torque, the angle between stator flux and rotor flux can be controlled. The angle can be adjusted by the control of voltage space vector. Since the rotation speed of the rotor flux remains unchanged, the angle can be adjusted by adjusting the instantaneous rotation speed of the stator flux

if the actual torque is less than the given value, select the voltage vector to rotate the stator flux in the counter clockwise direction, so as to increase the angle and increase the actual torque. Once the actual torque is higher than the given value, select the voltage vector to rotate the stator flux in the opposite direction. This causes the angle to decrease. By selecting the voltage vector in this way, the stator flux linkage rotates all the time, and its rotation direction is determined by the torque hysteresis controller

extended data:

principle

in direct torque control, the amplitude of stator flux linkage of motor is maintained at rated value through vector control of above voltage. To change the torque, the angle between stator flux and rotor flux linkage can be controlled. The angle can be adjusted by the control of voltage space vector. Since the rotation speed of the rotor flux remains unchanged, the angle can be adjusted by adjusting the instantaneous rotation speed of the stator flux

If the actual torque is less than the given value, the voltage vector that makes the stator flux rotate in the counter clockwise direction is selected. As the angle increases, the actual torque increases. Once the actual torque is higher than the given value, the voltage vector is selected to make the stator flux rotate in the opposite direction. This causes the angle to decrease. By selecting the voltage vector in this way, the stator flux linkage rotates all the time, and its rotation direction is determined by the torque hysteresis controller

The control of torque and flux linkage in direct torque control is realized by hysteresis comparator. The operation principle of the hysteresis comparator is: when the error between the current value and the given value is within the tolerance range of the hysteresis comparator, the output of the comparator remains unchanged. Once it exceeds this range, the hysteresis comparator will give the corresponding value

the principle block diagram of direct torque control is as follows: the given speed is compared with the estimated speed to obtain the given torque; The torque difference is processed as hysteresis loop by the torque regulator to get the torque control signal; The flux estimation is compared with the given flux, and the flux control signal is obtained by hysteresis comparator; According to the calculated rotor displacement, the sections are divided; According to the section, torque and flux control signals, combined with the look-up table, the space vector is obtained and the PWM wave is generated; Output to inverter, power supply to motor

7. Diagnostic Trouble CodeDTC 诊断故障代码

8. The performance of DSC vehicle electronic stability system is similar to the ESP (electronic stability system) of Bosch Company in Germany. It can provide good handling when the vehicle is moving at high speed, prevent the vehicle from tail flick or drift, and obtain accurate handling. It is a kind of electronic active safety protection system. The ESP name has been registered by Bosch. Therefore, the electronic stability system developed by other companies can only use other names. Such as DSC. The DTC button is BMW's body dynamic stability system, which integrates excellent active safety technologies such as ESP and traction control to prevent the vehicle from losing control. When the DTC is on, it is off
when the DTC lights up, it can drift (20% rear wheel slip is allowed)
once you press the DTC, it will enter the DTC mode, that is, it will allow the rear wheel to slip to a certain extent. Once you press the DTC again, it means that the DSC function is completely turned off. You can drift at will, but it is very dangerous

9. DTC is the abbreviation of diagnostic trouble code, which is the fault code in automotive electronic system.

10. DTC is generally referred to as. Engine fault code. If DTC appears in the car, especially in BMW. So he's talking about the electronic body stabilization system. Hope to help you, hope to adopt. thank you!