46results about How to "Guaranteed drivability" patented technology

The invention provides a torque control method in the process of a driving torque of an electric automobile exceeding zero. The torque control method in the process of the driving torque of the electric automobile exceeding the zero comprises the steps of a process for obtaining a driver required torque after flatly sliding, a torque forward direction exceeding the zero working condition judge process, a torque negative direction exceeding the zero working condition judge process, a torque forward direction exceeding the zero control process and a torque negative direction exceeding the zero control process. According to the torque control method in the process of the driving torque of the electric automobile exceeding the zero, under the condition of larger gear meshing gaps being causedby various reasons, on the premise of no physical buffering device existing on a power transmission route, two requirements of weak meshing impact and fast torque response in the process of the torqueexceeding the zero can be well met, and the whole vehicle NVH quality and driving feeling are improved; and meanwhile, the torque control method in the process of the driving torque of the electric automobile exceeding the zero further relieves the requirement on the gear meshing gaps, is beneficial to reducing the gear machining cost, in summary, the torque control method in the process of the driving torque of the electric automobile exceeding the zero can improve the cost and quality competitiveness of the electric automobile, and the significance is very important.

The invention relates to a control method for gear preselection of a dual clutch transmission and a control method for the dual cultch transmission, in particular to a control method used for gear preselection performed on an unengaged shaft of the dual clutch transmission. The control method aims at guaranteeing economical and dynamic requirements of shift points and drivability and comfortableness of the whole vehicle. The control method mainly includes steps: judging a gear needing to be engaged on a target shaft according to the acceleration of the whole vehicle and a currently running gear; calculating the time T needed for reaching an actual shift point of a preselected gear; determining the time T1 needed for completing engagement of the preselected gear according to the rotating speed of the target shaft; determining the time T2 needed for a synchronizer to totally complete engagement of the preselected gear according to positions of the synchronizer; determining a safe time factor T3 according to T1; and adding T2 and T3, and if the sum is equal to T, ordering the synchronizer to start to execute engagement of the preselected gear.

The invention relates to an intelligent evaluation system of a safe and civilized driving exam for motor vehicle drivers, and belongs to the mechanical field. The system comprises a vehicle driving simulator, the vehicle driving simulator comprises a vehicle seat which simulates that of a vehicle in real exam, a slot into which a dead bolt of a safety belt is inserted is arranged at one side of the vehicle seat, and the slot is internally provided with a sensor which is used to detect whether the safety belt is inserted. According to the system, the sensor detect whether the safety belts is inserted, and evaluation basis is provided for driving test.

The invention relates to control methods for dual clutch transmissions, particularly to a control method for gear pre-selection for an uncombined shaft of a dual clutch transmission and aims at providing the method capable of guaranteeing economy and dynamic property requirements of shift points as well as whole drivability and comfort of a whole vehicle. The control method mainly comprises the steps of judging gears to be combined on a target shaft according to the whole acceleration and the current operating gear; calculating time T required for arriving at actual shaft points of pre-selected gears; determining time T1 required for completing combination of the pre-selected gears according to the rotating speed of the target shaft; determining time T2 required for completely finishing the combination of the pre-selected gears by a synchronizer according to the position of the synchronizer; determining a safety time factor T3 according to the T1, adding the T2 and the T3 together, and if the sum is equal to the T, commanding the synchronizer to begin to execute combination of the pre-selected gears.

The invention provides a computing method for the heat management available power, a heat management controller and a heat management system. The heat management system comprises the heat management controller, the heat management controller uses the computing method to compute the heat management available power under the limiting working condition, computing of the drive available power is comprehensively considered while the heat management available power is computed through the computing method, and the heat management available power adopts a first-order low-pass filtering algorithm, and the size of the filtering parameters depends on that of the drive demanded power variation rate; and the drive available power limit coefficient adopts a PI algorithm, and the parameter P and the parameter I vary from the difference value of the drive available power and the actual drive power. By adoption of the computing method provided by the invention, under the limiting working condition, on the basis of the condition that the vehicle security requirement is met, driveability can be ensured to a largest extent, and power battery over discharge is avoided.

The present invention provides an energy management method, system, device and storage medium for a vehicle-mounted dual-source battery pack, wherein the energy management method for a vehicle-mounted dual-source battery pack includes: selecting one of the battery packs according to the battery status of the first battery pack and the second battery pack Once the motor controller is powered on to drive the motor to rotate, the battery status includes fault status, high voltage status and whether the remaining power exceeds the preset power threshold. The invention can expand the scope of application of the dual-source battery pack, improve the convenience of the dual-source battery pack, and improve the cruising range under the premise of ensuring power, economy, and driving performance, and greatly reduce the cost of the battery pack and the cost of the entire vehicle. the cost of.

The invention provides a novel four-drive hybrid power system and further provides a novel four-drive hybrid power driving method. The novel four-drive hybrid power system comprises an engine, an automatic transmission, a first motor, a battery, a first power battery, a second power battery, a second motor and a reducer. The engine is connected with a front driving shaft of a vehicle through the automatic transmission to drive front wheels of the vehicle; the engine is connected with the first motor; the first motor is connected with the first power battery; the first power battery is connected with the second power battery; the second power battery is connected with the second motor; the battery is connected with the first power battery and used for meeting the requirements of electric appliances for a voltage platform of the vehicle; and the second motor is connected with a rear driving shaft of the vehicle through the reducer to drive rear wheels of the vehicle. The four-drive function can be achieved, and front and rear power assemblies can output torque as required, so that the vehicle obtains the optimal power combination, the dynamic property of the vehicle is remarkably improved, meanwhile, the economical efficiency is excellent, and energy saving and environmental protection are achieved.

The invention provides a pure electric vehicle torque cross-zero torque control method, which includes obtaining the smoothed driver demand torque process, the torque positive cross-zero working condition judgment process, the torque negative cross-zero working condition judgment process, and the torque positive cross-zero working condition judgment process. The control process of crossing zero and the negative torque crossing control process; this method can solve the problem of torque very well under the premise that there is no physical buffer device on the power transmission path when the gear meshing gap is slightly large due to various reasons. The two requirements of weak meshing impact and fast torque response in the process of crossing 0 can improve the NVH quality and driving experience of the vehicle; at the same time, this method also reduces the requirements for the gear meshing clearance, which is also beneficial to reduce the cost of gear processing. , this method is of great significance for improving the cost and quality competitiveness of electric vehicles.

The invention discloses a grouping pushing-sliding control system and method for intelligent hydraulic supports. The grouping pushing-sliding control system and method are suitable for pushing-sliding of the hydraulic supports of a fully-mechanized coal mining face under a coal mine. The system comprises distributed hydraulic support controllers and a hydraulic support remote monitoring system. Distributed hydraulic support controllers in the mining face are connected through a CAN bus and a TCP Ethernet, and connected with the hydraulic support remote monitoring system. Depending on a hydraulic support pushing-sliding curve stored in the system, the hydraulic supports can be divided into sections, parallel grouping control is performed inside each section, the number of grouped supports is set automatically depending on the driving pressure limit of a hydraulic pump, on the premise of guaranteeing drivability, the operation processes of grouping pushing-sliding control are simplified, the pushing-sliding efficiency is improved to the maximum degree, and the amount of repetition labor is reduced for an operator.

The invention discloses a powertrain control method for reducing torsional vibration of a drive train, belonging to the technical field of passenger car automatic transmission control technology or clutch control technology. Torsional amplitude value of each accelerator opening; Step 2: Determine the gear, rotational speed, and throttle opening range where the torsional amplitude value exceeds the standard according to the test results of Step 1; Step 3: Determine the torsional amplitude of the drive train after adding slip-friction compensation of different clutches value up to the standard; Step 4: Determine the maximum transmission torque under this slip and friction difference according to the slip and friction difference determined in Step 3 and the heating characteristics of the clutch; Step 5: Determine the corresponding accelerator according to the maximum transmission torque in Step 4 Adjust the clutch slip control and transmission shift control according to the opening range and speed range; Step 6: According to the maximum transmission torque in Step 4, determine the corresponding throttle opening range and speed range, and adjust the torque output characteristics of the engine.

A vehicle adaptive speed limit control method, comprising the steps of: reading the actual driving torque, vehicle speed signal and slope signal of the vehicle, and using the vehicle dynamic model to calculate according to the signal, calculating the vehicle resistance curve of the vehicle, The calculation formula of resistance curve is F=mg*tan(slope)+mg*tan(slope)*u+0.5*AirCd*VehCrossArea*ρv 2 +m*a; Optimally select the maximum acceleration under the current vehicle and the acceleration of the preset best drivability, and calculate the target acceleration curve; read the target speed limit value, and calculate it in the step according to the target speed limit value Select the target acceleration at the current vehicle speed from the target acceleration curve; then compare the target acceleration with the current actual acceleration to calculate the target acceleration for control; use the target acceleration for control to recommend the target control torque to limit the actual output torque. Convert the control target value into the control quantity. When the limit speed is controlled, it can simulate the driver to predict the state of the vehicle in advance to achieve a good driving effect.

The invention relates to a valve washing control method of a wet-type double-clutch speed changer. The valve washing control method of the wet-type double-clutch speed changer comprises the followingsteps that a vehicle state detection step is carried out, specifically, current states of a vehicle are detected to obtain vehicle gear information, speed changer state information, and the current states of the vehicle are judged; the current states of the vehicle comprise a parking state, a flameout state and a clutch passive state, wherein the parking state, the flameout state and the clutch passive state serve as stable states; and a valve washing control step is carried out, specifically, under the stable states, a main control unit controls an oil pump to pump hydraulic oil to a solenoidvalve on the basis of preset impulse valve starting parameters, so that valve washing operation on the solenoid valve is carried out. According to the scheme, the valve washing operation on the solenoid valve in the speed changer can be realized under various states of the vehicle, so that the normal use effect of the solenoid valve in the speed changer is ensured, and the driving performance isguaranteed.