CN-116588107-B - Method for improving creep starting smoothness of plateau cooler

CN116588107BCN 116588107 BCN116588107 BCN 116588107BCN-116588107-B

Abstract

The invention provides a method for improving the creep start smoothness of a plateau cooler. The method comprises the steps of firstly, in a cold state of a high-altitude vehicle, consuming part of electric quantity of a storage battery, cutting off an air-conditioning compressor after increasing the load of the engine, and starting the engine to pass through barriers, secondly, in the cold state of the high-altitude vehicle, the load of the engine after starting can be greatly improved by consuming part of electric quantity of the storage battery when the vehicle is in a cold state, so that the vehicle can pass through barriers through forward gears or reverse gears when in use, can be separated from pits by loosening a brake, and meanwhile, the load of the engine can be accurately cut off, the loss of oil is reduced, after the speed of the creeping vehicle is stable, the air-conditioning compressor can be normally sucked, and the vehicle starting smoothness is good, so that the phenomena of pit dropping of the engine speed and shaking of the whole vehicle caused by the torque of the engine can be avoided.

Inventors

ZHANG YIHONG
Wei Linxin
GUO YANHUA
YE LU
NING CHENGGANG

Assignees

江铃汽车股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230602

Claims (3)

1. A method for improving the creep start smoothness of a plateau cooler is characterized by comprising the following steps: Step one, in a cold state of a high-altitude vehicle, in a whole vehicle creeping starting stage, consuming partial electric quantity of a storage battery, cutting off an air conditioner compressor after increasing the load of the engine, and starting the engine to pass the obstacle; Step two, in a cold state of the high-altitude vehicle, after the creeping speed is stable, adjusting the engine speed n, the gearbox target speed ntcu, the computer control module ECU and the air conditioner compressor B_ac; wherein, after the vehicle is immersed for more than 8 hours, the first step further comprises: step S1, the vehicle is electrified in situ, a gear signal Tra of a gearbox is kept at a neutral gear, a headlight is turned on, the air quantity of an air conditioner blower is adjusted to be maximum, double-flash electric equipment is turned on for 10 minutes, the electric quantity of a storage battery is consumed, and the load gl of a generator after the starting is greatly improved; step S2, the engine is ignited to idle, the air conditioner is started to refrigerate, the compressor is sucked, the gear of the gearbox is shifted to a forward gear or a reverse gear, the brake pedal B_brk is released, and the accelerator pedal acc=0 is not stepped on; step S3, after releasing the brake delay time T1, the ECU of the computer control module turns off the air conditioner compressor; the second step further comprises: Step S4, when the vehicle speed SP exceeds SP2 and the time T3 is delayed, controlling the air conditioner compressor to be attracted through the ECU; wherein, the basic conditions that the ECU of the computer control module disconnects the air conditioner compressor and needs to meet also include: the transmission gear Tra is not in neutral N; altitude AL is greater than threshold AL1; The generator load GL is greater than the threshold GL1; the vehicle speed SP is lower than the threshold SP1; The engine water temperature T is lower than the threshold T2.
2. The method for improving the creep start smoothness of the plateau cooler according to claim 1, wherein step S3 comprises the steps of responding to a target speed ntcu of a gearbox by an engine speed n after the whole vehicle is in creep stability, disconnecting an air conditioner compressor B_ac=1 by a computer control module ECU, subtracting the air conditioner torque from the total accessory torque, and starting the vehicle to move.
3. The method for improving the creep start smoothness of the altitude fridge according to claim 1, wherein the step of cutting off the main control parameters of the air conditioner compressor in the fridge state of the altitude fridge comprises the steps of: Altitude AL1, which is based on the expression value of the engine speed at the time of creeping start; The generator load GL1 is based on the expression value of the engine speed during creeping start; The vehicle speed SP1 is based on the expression value of the engine rotating speed during the creeping start; Releasing the brake delay time T1, and selecting a value based on the expression of the engine speed during the creep start; the accelerator pedal opening ACC1 is based on the value of the vehicle starting smoothness performance during accelerator up; The engine water temperature T2 is based on the expression value of the engine rotating speed during creeping; the vehicle speed SP2 and the compressor delay time T3 are sucked, and are all based on the vehicle starting smoothness performance value; The engine speed n is the idling speed of the engine before releasing the brake, and the target speed of the gearbox can be responded during creep; the transmission target speed ntcu, the transmission controller takes a value according to the creep behavior.

Description

Method for improving creep starting smoothness of plateau cooler Technical Field The invention relates to the field of vehicle engine control, in particular to a method for improving the creep start smoothness of a plateau cooler. Background The automobile engine is a device for providing power for an automobile, is a heart of the automobile, determines the dynamic property, economy, stability and environmental protection of the automobile, can be divided into a diesel engine, a gasoline engine, an electric automobile motor, hybrid power and the like according to different power sources, and is a common gasoline engine and a diesel engine which belong to a reciprocating piston type internal combustion engine and are used for converting chemical energy of fuel into mechanical energy of piston motion and outputting power outwards. In a high altitude environment, because the environmental pressure is lower than that of a plain, the air input involved in engine combustion is smaller than that of the plain, the combustion torque is smaller at the same rotation speed of the engine, when a vehicle is creeping, the vehicle is creeping and starting at the altitude of 4700m, the vehicle is cold (the water temperature is lower than 40 ℃), the rotation speed of the engine is reduced to 700rpm due to the overlarge resistance of the engine in the suction state of an air conditioner compressor, the whole vehicle shakes (see fig. 2, line 1 represents the vehicle speed sp, line 2 represents the self-rotation speed n of the engine, line 3 represents the target rotation speed ntcu of the gearbox, line 4 represents the accelerator opening acc, line 5 represents the disconnection mark B_ac of the compressor, and line 6 represents the brake mark B_brk); The cold state of the vehicle (immersed for more than 8 hours, at the moment, the water temperature of the engine is basically equal to the ambient temperature), the electric equipment such as a headlight, an air conditioner blower (the air quantity is regulated to the maximum), double flash and the like is started in situ, the electric quantity of a storage battery can be rapidly reduced in the process for about 10 minutes, and the engine is ignited to enter an idle working condition; because the storage battery is in a feeding state after discharging, the load of the generator is very large, the air conditioner is turned on for refrigeration (the compressor is attracted), the gear box is shifted to a forward gear or a reverse gear, then the brake is released, and before the vehicle starts, the sum of the friction resistance of the engine (large cold machine resistance), the torque of the accessory (large load of the generator and the torque of the air conditioner) and the creep torque of the gear box is very large, exceeds the combustion torque of the engine, so that the rotating speed of the engine falls off a pit, the whole vehicle shakes, and meanwhile, the vehicle cannot be separated from the pit after falling off the pit, so that the vehicle cannot advance. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a method for improving the creeping start smoothness of a plateau cooler, which solves the problems that the engine speed falls out of pits, the whole vehicle shakes, and the vehicle cannot go out of pits after falling out of pits because the generator load is large, the air conditioner is turned on for refrigeration (the compressor is sucked) at the moment, the gear of the gearbox is shifted to a forward gear or a reverse gear, then the brake is released, and the sum of the friction resistance of the engine (the resistance of the cooler is large), the accessory torque (the load of the generator and the air conditioner torque) and the creeping torque of the gearbox is very large before the vehicle starts. (II) technical scheme In order to achieve the above purpose, the invention is realized by the following technical scheme: A method for improving the creep start smoothness of a plateau cooler comprises the following steps: Step one, in a cold state of a high-altitude vehicle, in a whole vehicle creeping starting stage, consuming partial electric quantity of a storage battery, cutting off an air conditioner compressor after increasing the load of the engine, and starting the engine to pass the obstacle; And step two, in a cold state of the high-altitude vehicle, after the creeping speed is stable, the engine speed n, the gearbox target speed ntcu, the computer control module ECU and the air conditioner compressor B_ac are adjusted. Preferably, the step one of consuming part of the electric quantity of the storage battery comprises the steps of starting a headlight, starting the air quantity of an air conditioner to the maximum, starting double-flash electric equipment, and keeping for 10min; further, the first step starts the engine to carry out forward gear or reverse gear, and the brake is releas