CN-115901235-B - Offline detection method for wet double-clutch automatic gearbox

CN115901235BCN 115901235 BCN115901235 BCN 115901235BCN-115901235-B

Abstract

The invention discloses a wet double-clutch automatic gearbox offline detection method which comprises the steps of detecting whether values of sensors are in the range of the respective set maximum value and the minimum value, detecting current control, calibrating PRND (pulse-of-digital) signals, namely giving an input shaft of an automatic gearbox to be detected with the rotating speed of N1 revolutions per minute, respectively detecting the voltage of a PRND position sensor when a gear shifting handle is at a P, R, N, D position, calibrating the PRND signals when the detected voltage of the P, R, N, D position is in the range of the set maximum value and the minimum value, otherwise, calibrating the PRND signals to fail, detecting clutch leakage, detecting hydraulic leakage, calibrating a shifting fork, detecting hydraulic leakage, detecting clutch pressure current, detecting a half-junction point and detecting gear shifting quality. The invention has the advantages of accuracy, convenience and reliability in detecting the automatic gearbox.

Inventors

XI JIANMIN
YAO YINHUA
WANG YUN
SI HONGLU
PENG TIANHE
DENG TAO
LUO YI
QIN CHUAN
YAN SHIYONG
LIN YUANZONG
ZENG KAILIAN

Assignees

重庆青山工业有限责任公司

Dates

Publication Date: 20260508
Application Date: 20221117

Claims (6)

1. The method for detecting the offline of the wet double-clutch automatic gearbox is characterized by comprising the following steps of: Detecting whether the value of each sensor is in the range of the maximum value and the minimum value set by each sensor and whether each sensor reports faults; The current control detection step comprises the steps of giving an input shaft of an automatic gearbox to be detected a rotational speed of N3 revolutions per minute, respectively applying control currents with different values in a plurality of solenoid valve input current ranges to a main piezoelectric valve, a lubrication solenoid valve, a shifting fork shift solenoid valve, a clutch solenoid valve and a shifting fork reversing solenoid valve, reading feedback currents after each solenoid valve applies each control current, comparing each control current of each solenoid valve with corresponding feedback current, and when the difference value after comparison is smaller than or equal to the respective set allowable deviation maximum value, passing the current control detection, otherwise failing the current control detection; The PRND calibration step comprises the steps of giving an input shaft of an automatic gearbox to be detected a rotational speed of N1 revolutions per minute, respectively detecting the voltage of a PRND position sensor when a gear shifting handle is at P, R, N, D positions, and if the detected voltage at P, R, N, D positions is in the range of the set maximum value and the set minimum value of the detected voltage, passing the PRND calibration, otherwise failing the PRND calibration; the method comprises a clutch leakage detection step, a first hydraulic leakage detection step, a shifting fork calibration step, a second hydraulic leakage detection step, a clutch pressure and current detection step, a half-junction detection step and a gear shifting quality detection step; when the oil temperature of the gearbox is Y1, the main pressure of the gearbox reaches the maximum value through a computer control instruction, the maximum current in the clutch input current range is applied to the clutch, the input shaft of the automatic gearbox to be detected is given with a plurality of different rotating speeds, and the actual pressure value of the clutch when the rotating speed of each input shaft is detected; when the detected actual clutch pressure value at the corresponding input shaft rotating speed is greater than or equal to the set pressure minimum value of the corresponding input shaft rotating speed, the hydraulic leakage detection is passed, otherwise, the hydraulic leakage detection is failed; giving the input shaft of the automatic gearbox to be detected with the rotation speed of N5 revolutions per minute, enabling the main pressure of the gearbox to reach the maximum value through a computer control instruction, and controlling a shifting fork gear engaging electromagnetic valve and a shifting fork reversing electromagnetic valve to perform self-learning on the left gear, the neutral gear and the right gear on each shifting fork to obtain the gear positions of the left gear, the neutral gear and the right gear on all shifting forks, wherein when the following conditions are met simultaneously, the shifting fork calibration detection is carried out by: 1) The difference value obtained by subtracting the neutral position on each shifting fork from the left gear position on the same shifting fork is in the set maximum value and minimum value range, and the difference value obtained by subtracting the neutral position on each shifting fork from the right gear position on the same shifting fork is in the set maximum value and minimum value range; 2) The same neutral gear on each shifting fork, and the deviation of the neutral gear position during multiple self-learning is smaller than or equal to the set maximum value of the neutral gear deviation; 3) The deviation of the gear position of each non-neutral gear is smaller than or equal to the set maximum value of non-neutral gear deviation during multiple self-learning; 4) The left gear on each shifting fork is positioned in a set maximum value and minimum value range; 5) The right gear on each shifting fork is positioned in a set maximum value and minimum value range; When the 5 conditions cannot be met at the same time, the shift fork calibration detection fails; The method comprises the steps of giving an input shaft of an automatic gearbox to be detected a rotational speed of N8 revolutions per minute, enabling the main pressure of the gearbox to reach the maximum value through a computer control instruction, controlling a shifting fork gear engaging electromagnetic valve and a shifting fork reversing electromagnetic valve to engage each gear which is not in neutral gear, detecting the synchronization time and the shifting time of each shifting fork gear engaging, and when the synchronization time of all shifting fork gears is smaller than or equal to the set maximum synchronization time and the shifting time is smaller than or equal to the set maximum shifting time, enabling the shifting quality to be detected to pass, otherwise, enabling the shifting quality to be detected to fail.
2. The method according to claim 1, wherein in the step of detecting input/output, the input shaft of the automatic transmission to be detected is first given a rotational speed of N2 rpm, and then a failure is detected by the shift fork position sensor, the clutch pressure sensor, the clutch oil outlet temperature sensor, the transmission oil temperature sensor, the PRND position sensor, the input shaft rotational speed sensor, the output shaft direction sensor, the key position sensor, the PCB temperature sensor, whether the values of the shift fork position sensor, the clutch pressure sensor, the clutch oil outlet temperature sensor, the transmission oil temperature sensor, the PRND position sensor, the input shaft rotational speed sensor, the output shaft rotational speed sensor, the main piezoelectric solenoid valve, the lubrication solenoid valve, the clutch pressure solenoid valve, the shift fork reversing solenoid valve, the 5V and the 8V power supply voltage sensor are in the range of the maximum value and the minimum value set by the sensors, and if the values of the respective sensors are in the range, the failure is detected by the input/output solenoid valve is not detected.
3. The method for detecting the off-line of the wet type double clutch automatic gearbox according to claim 1, wherein the step of detecting the clutch leakage is characterized in that the input shaft of the automatic gearbox to be detected is given a rotating speed of N4 revolutions per minute, the main pressure of the gearbox is enabled to reach the maximum value through a computer control instruction, and the actual clutch pressure value when the current is applied to the clutch is detected; When the minimum value current of the clutch input current range is applied, the corresponding clutch actual pressure value is smaller than or equal to the set low-pressure maximum value pressure, and when the maximum value current of the clutch input current range is applied, the corresponding clutch actual pressure value is larger than or equal to the set high-pressure minimum value pressure, clutch leakage detection passes, otherwise, the clutch leakage detection fails.
4. The method for detecting the off-line of the wet type double clutch automatic gearbox according to claim 1, wherein the second step of hydraulic leakage detection is to enable the main pressure of the gearbox to reach the maximum value through a computer control command when the oil temperature of the gearbox is Y2, apply the maximum current of a clutch input current range to the clutch, give the input shaft of the automatic gearbox to be detected with a plurality of different rotating speeds, detect the actual pressure value of the clutch at each input shaft rotating speed, and enable the actual pressure value of the clutch at the detected corresponding input shaft rotating speed to be larger than or equal to the pressure minimum value of the set corresponding input shaft rotating speed when all the input shaft rotating speeds are detected, and enable the second detection of the hydraulic leakage detection to pass, otherwise enable the second detection of the hydraulic leakage detection to fail.
5. The method for detecting the off-line of the wet type double clutch automatic gearbox according to claim 1, wherein the step of detecting the clutch pressure current comprises the steps of giving the input shaft of the automatic gearbox to be detected a rotational speed of N6 revolutions per minute, enabling the main pressure of the gearbox to reach the maximum value through a computer control instruction, applying control currents with different values in a range of a plurality of input currents of the clutch solenoid valves to the clutch solenoid valves, detecting the actual clutch pressure value of the clutch solenoid valves after each control current is applied, and detecting the clutch pressure current by the following conditions when the following conditions are simultaneously satisfied: 1) The actual clutch pressure value at each control current is within the pressure range of the maximum value and the minimum value set by the corresponding current value; 2) The maximum fluctuation amount of the clutch actual pressure value at each control current is smaller than or equal to the maximum fluctuation amount pressure value set at the corresponding current value; 3) When the control current presents an increasing relation, the corresponding clutch actual pressure value also presents an increasing relation, and the increment of the clutch actual pressure value is larger than or equal to the set minimum increment pressure value; when the above 3 conditions cannot be satisfied at the same time, the clutch pressure current detection fails.
6. The method for detecting the offline of the wet-type double-clutch automatic gearbox according to claim 1, wherein the step of detecting the half-engagement point is characterized in that the input shaft of the automatic gearbox to be detected is given a rotating speed of N7 revolutions per minute, the main pressure of the gearbox reaches the maximum value through a computer control instruction, the clutch half-engagement point is self-learned through a clutch electromagnetic valve, the position of the clutch half-engagement point is obtained, when the pressure of the clutch half-engagement point is within a set range of the maximum value and the minimum value, the half-engagement point is detected to pass, and otherwise, the half-engagement point is failed to detect.

Description

Offline detection method for wet double-clutch automatic gearbox Technical Field The invention relates to the field of automatic gearbox detection, in particular to a wet double-clutch automatic gearbox offline detection method. Background Automatic gearboxes are increasingly widely used, and it is increasingly important to ensure that the automatic gearboxes are of good quality and performance. The off-line detection of the automatic gearbox plays a very important role as a gateway before the automatic gearbox leaves a factory and is marketed. The automatic gearbox with unqualified quality flows into the market, so that safety risks are brought to consumers, the automatic gearbox with inaccurate basic characteristic data is installed on the whole car, poor driving experience is caused, manual and manual offline detection modes cannot meet the rapid detection requirements of a large number of automatic gearboxes, problems cannot be rapidly located when offline detection fails, time and labor are wasted in finding out reasons of the problems, and the like. For example, the current situation and problems associated with automatic transmission offline detection continue to exist and require a solution to overcome the difficulties and efforts. Disclosure of Invention The invention provides a method for detecting the offline of a wet double-clutch automatic gearbox, which provides a quick, accurate, convenient and reliable detection solution for offline, delivery and marketing of the automatic gearbox. The technical scheme for solving the technical problems is as follows: the method for detecting the offline of the wet double-clutch automatic gearbox is characterized by comprising the following steps of: Detecting whether the value of each sensor is in the range of the maximum value and the minimum value set by each sensor and whether each sensor reports faults; a step of current control detection; The PRND calibration step comprises the steps of giving an input shaft of an automatic gearbox to be detected a rotational speed of N1 revolutions per minute, respectively detecting the voltage of a PRND position sensor when a gear shifting handle is at P, R, N, D positions, and if the detected voltage at P, R, N, D positions is in the range of the set maximum value and the set minimum value of the detected voltage, passing the PRND calibration, otherwise failing the PRND calibration; The method comprises the steps of clutch leakage detection, hydraulic leakage detection, shifting fork calibration, hydraulic leakage detection, clutch pressure and current detection, half-junction point detection and gear shifting quality detection. Further, in the step of detecting input/output, the input shaft of the automatic gearbox to be detected is firstly given a rotation speed of N2 revolutions per minute, then faults are detected on the shift fork position sensor, the clutch pressure sensor, the clutch oil outlet temperature sensor, the gearbox oil temperature sensor, the PRND position sensor, the input shaft rotation speed sensor, the output shaft direction sensor, the key position sensor and the PCB temperature sensor, the shift fork position sensor, the clutch pressure sensor, the clutch oil outlet temperature sensor, the gearbox oil temperature sensor, the PRND position sensor, the input shaft rotation speed sensor, the output shaft rotation speed sensor, the main piezoelectric solenoid valve, the lubrication solenoid valve, the clutch pressure solenoid valve, the shift fork gear solenoid valve, the reversing solenoid valve, the 5V and 8V power supply voltage sensor, and if the values of the various sensors and the solenoid valve are in the range of the maximum value and the minimum value set respectively, and if the values of the shift fork position sensor and the solenoid valve are in the range of the maximum value and the minimum value set respectively, and if the values are not set, the faults are detected, otherwise, the input/output fails to be detected. Further, the current control detection step comprises the steps of giving the input shaft of the automatic gearbox to be detected a rotational speed of N3 revolutions per minute, respectively applying control currents with different values in a plurality of solenoid valve input current ranges to a main solenoid valve, a lubrication solenoid valve, a shifting fork gear solenoid valve, a clutch solenoid valve and a shifting fork reversing solenoid valve, reading feedback currents after each solenoid valve applies each control current, comparing each control current of each solenoid valve with corresponding feedback current, and when the difference value after comparison is smaller than or equal to the maximum value of the respective set allowable deviation, passing the current control detection, otherwise failing the current control detection. Further, the clutch leakage detection comprises the steps of giving an input shaft of the automatic gearbox to be detected a rot