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CN-115789240-B - Engineering machinery transmission control system and control method

CN115789240BCN 115789240 BCN115789240 BCN 115789240BCN-115789240-B

Abstract

The invention discloses a control system and a control method of an engineering mechanical transmission, wherein the system comprises a gear shifting control electronic unit, a vehicle working condition and vehicle condition detection unit, a driver intention acquisition unit, a gear driving unit, a gear shifting monitoring unit and a communication unit, wherein the vehicle working condition and vehicle condition detection unit, the driver intention acquisition unit, the gear shifting driving unit, the gear shifting monitoring unit and the communication unit are all connected with the gear shifting control electronic unit, the gear shifting control electronic unit comprises a power circuit and a gear electromagnetic valve driving signal output circuit, and the power circuit comprises a power conversion chip U8 and a chip isolation power module U9, wherein the power conversion chip U8 is used for converting a +24V power supply into 5V power supply. The invention can avoid the damage of voltage pulse generated during operation to the gear shifting controller, and adopts oil filling and discharging time and pressure control to solve the gear shifting impact.

Inventors

  • LIU ZHIFU
  • SHU DONGXU
  • YANG LIU
  • XIE DAZHI
  • ZHANG QIANLAN

Assignees

  • 中国航发中传机械有限公司

Dates

Publication Date
20260505
Application Date
20221107

Claims (7)

  1. 1. The engineering mechanical transmission control system is characterized by comprising a gear shifting control electronic unit, a vehicle working condition and vehicle condition detection unit, a driver intention acquisition unit, a gear driving unit, a gear shifting monitoring unit and a communication unit, wherein the vehicle working condition and vehicle condition detection unit, the driver intention acquisition unit, the gear shifting driving unit, the gear shifting monitoring unit and the communication unit are all connected with the gear shifting control electronic unit, the gear shifting control electronic unit comprises a power supply circuit and a gear electromagnetic valve driving signal output circuit, the power supply circuit comprises a power supply conversion chip U8 for converting a +24V power supply into 5V and a chip isolation power supply module U9, a pin 1 of the power supply conversion chip U8 is connected with a polarity capacitor CP9, a pin 2 is connected with a voltage stabilizing tube D10, the pin is also connected with one end of an inductor L1, the other end of the inductor L1 is a 5V voltage output end, the 5V voltage output end is connected with a polarity capacitor CP10, the negative electrode of a light emitting diode DS1 is grounded, the positive electrode is connected with one end of a resistor R96, the other end of the power supply conversion chip U8 is connected with the pin 4 of the power supply conversion chip L1 and the other end of the inductor L1, and the light emitting diode DS1 and the resistor R96 are matched with each other to detect whether the voltage exists at the output end; The power supply is characterized in that pins 2 and 3 of a chip isolation power supply module U9 are connected with a polar capacitor cathode and a power supply ground, pins 22 and 23 of the chip isolation power supply module U9 are connected with a power supply 24V, and pin 16 of the chip isolation power supply module U9 is connected with a signal power supply ground, pin 14 of the chip isolation power supply module U9 is respectively connected with a positive electrode of a polar capacitor CP13, one end of a resistor R99 and one end of a resistor R97, the pin 14 outputs a power supply VDD_3.3V, the other end of the R97 outputs a power supply VCC_3.3V, and VCC_3.3V is filtered and stabilized through a capacitor C6 and a 10uF tantalum capacitor CP 11; The gear electromagnetic valve driving signal output circuit comprises a chip U11, a pin 3 of the chip U11 is connected with one end of a resistor R84, the other end of the resistor R84 is connected with a processor electromagnetic valve control output signal, a pin 4 of the chip U11 is connected with one end of a resistor R96, a pin 6 of the chip U11 is connected with one end of a resistor R80, one end of the resistor R80 is respectively connected with a power ground and one end of a resistor R97, the other end of the R97 is connected with the other end of the resistor R96 to form a signal feedback end, whether open circuit or short circuit faults occur at the gear electromagnetic valve driving output ends of a pin 18 and a pin 17 of the chip U11 or not is fed back, and a pin 18 of the chip U11 is connected with one end of a resistor R68 and the negative electrode of a freewheel diode D7.
  2. 2. The engineering machinery transmission control system according to claim 1, further comprising a DC/DC isolated regulated power supply M1, a neutral gear relay J1 and a reversing relay J2, wherein the power input positive electrode of the DC/DC isolated regulated power supply M1 is connected with the positive electrode of a vehicle-mounted storage battery through a safety FUSE, the input negative electrode of the M1 is connected with the ground of the vehicle body, the output ground of the M1 is connected with the power supply positive electrode of the gear shifting control electronic unit through 3-5 and 3-6 wires, the output power supply of the M1 is connected with the power supply positive electrode of the gear shifting control electronic unit through 3-1 and 3-2 wires, one end of a coil of the neutral gear relay J1 is connected with the neutral gear control end of the gear shifting control electronic unit, the other end of the coil of the neutral gear relay J1 is connected with the output ground of the M1, the vehicle body ground is sequentially connected with the positive electrode of the storage battery through a key starting switch, a normally open contact of the neutral gear relay J1 and one end of a vehicle starting coil RL1, one end of the reversing relay J2 is connected with the reverse gear control end of the gear shifting control electronic unit, one end of the reverse gear relay J1 is connected with the output ground of the reverse gear relay L1, and the normally open contact of the vehicle lamp L1 is connected with the normally open.
  3. 3. The construction machine transmission control system according to claim 1 or 2, wherein the vehicle condition and vehicle condition detection unit includes one or more of a vehicle speed sensor, a pump rotation speed sensor, a turbine rotation speed sensor, a gear oil pressure sensor, and an oil temperature sensor.
  4. 4. The transmission control system of construction machinery according to claim 3, wherein the vehicle speed sensor, the pump impeller rotation speed sensor and the turbine impeller rotation speed sensor are magneto-electric type or helter type pulse wave sensors, and the gear oil pressure sensor and the oil temperature sensor are analog signal output sensors.
  5. 5. The transmission control system of construction machinery according to claim 1 or 2, wherein the driver intention acquisition unit includes a mode handle information acquisition module, a brake signal acquisition module, and an accelerator pedal signal acquisition module.
  6. 6. The engineering machinery transmission control system according to claim 1 or 2, wherein the gear driving unit comprises a gear electromagnetic valve and an output whole vehicle signal module, the monitoring unit comprises a transmission state liquid crystal monitoring information module, and the communication unit comprises a calibration interface and a whole vehicle CAN communication interface.
  7. 7. A control method based on the transmission control system of the construction machine according to any one of claims 1 to 6, characterized by comprising the steps of: acquiring a gear shifting boosting curve and gear oil filling and oil discharging overlap time; If the vehicle does not have a gear shifting condition, the existing gear state of the vehicle is kept continuously, and the target gear is judged continuously; if yes, the upshift and shift logic is called, upshift and oil discharge and oil charge time control are carried out, wherein the oil charge and discharge time overlaps a part to reduce torque output interruption time so as to reduce impact; If not, the downshift shift logic is invoked, downshift oil discharge and oil charge time control are performed, and oil discharge is delayed after oil charge, so as to reduce vehicle impact caused by backward acceleration of vehicle running.

Description

Engineering machinery transmission control system and control method Technical Field The invention mainly relates to the technical field of engineering machinery, in particular to a control system and a control method of an engineering machinery transmission. Background The engineering machinery operation process has the working characteristics of large starting torque requirement, large load change, frequent working condition conversion and high operation efficiency requirement. A hydromechanical transmission is often used in a power transmission system of a construction machine to meet operating requirements. The hydraulic mechanical speed variator consists of hydraulic torque converter connected serially to one mechanical speed variator, and the hydraulic transmission has high low speed transmission torque, stable transmission, high and stable performance, automatic speed regulating capacity, capacity of raising the trafficability of vehicle in special road, such as muddy, sandy, snowy and other soft road, smooth starting, fast and homogeneous acceleration. The adopted liquid medium of the transmission can be used as an oil supply system and a gear shifting hydraulic control system of the gearbox, and the multi-gear hydromechanical transmission mostly realizes automatic or semi-automatic gear shifting through a gear shifting control device, so that the aims of adapting to continuous change of working conditions, simplifying control and improving operation efficiency are fulfilled. The degree of impact is an important indicator for evaluating the shift quality of a hydromechanical transmission. During gear shifting, oil filling and discharging time of a wet clutch drum in a transmission and oil filling pressure control are important factors influencing the impact degree. However, there is no technology for solving shift shock through oil filling and oil discharging time and oil filling pressure control. Disclosure of Invention The technical problem to be solved by the invention is to provide an engineering mechanical transmission control system and a control method for solving gear shifting impact aiming at the technical problem existing in the prior art. In order to solve the technical problems, the technical scheme provided by the invention is as follows: The engineering mechanical transmission control system comprises a gear shifting control electronic unit, a vehicle working condition and vehicle condition detection unit, a driver intention acquisition unit, a gear driving unit, a gear shifting monitoring unit and a communication unit, wherein the vehicle working condition and vehicle condition detection unit, the driver intention acquisition unit, the gear shifting driving unit, the gear shifting monitoring unit and the communication unit are all connected with the gear shifting control electronic unit, the gear shifting control electronic unit comprises a power supply circuit and a gear electromagnetic valve driving signal output circuit, the power supply circuit comprises a power supply conversion chip U8 for converting a +24V power supply into 5V and a chip isolation power supply module U9, a1 pin of the power supply conversion chip U8 is connected with a polarity capacitor CP9, a 2 pin of the power supply conversion chip U8 is connected with a voltage stabilizing tube D10, the pin is also connected with one end of an inductor L1, the other end of the inductor L1 is a 5V voltage output end, the 5V voltage output end is connected with the polarity capacitor CP10, the negative electrode of a light emitting diode DS1 is grounded, the positive electrode is connected with one end of a resistor R96, the other end of the light emitting diode DS1 is connected with the other end of the 4 pin of the power supply conversion chip U8 and the other end of the inductor L1, and the light emitting diode DS1 and the resistor R96 are matched with each other to detect whether the voltage is output end exists; The power supply is characterized in that pins 2 and 3 of a chip isolation power supply module U9 are connected with a polar capacitor cathode and a power supply ground, pins 22 and 23 of the chip isolation power supply module U9 are connected with a power supply 24V, pin 16 of the chip isolation power supply module U9 is connected with a signal power supply ground, pin 14 of the chip isolation power supply module U9 is respectively connected with a positive electrode of a polar capacitor CP13, one end of a resistor R99 and one end of a resistor R97, the pin 14 outputs a power supply VDD_3.3V, the other end of the resistor R97 outputs a power supply VCC_3.3V, and VCC_3.3V is filtered and stabilized through a capacitor C6 and a 10uF tantalum capacitor CP 11. Preferably, the gear electromagnetic valve driving signal output circuit comprises a chip U11, a pin 3 of the chip U11 is connected with one end of a resistor R84, the other end of the resistor R84 is connected with a processor electromagnetic valve control o