31results about How to "Avoid frequent gear changes" patented technology

The invention provides a shift method of a hybrid electric vehicle. The method comprises the steps of firstly, determining that a battery is in a dischargeable state or a rechargeable state according to SOC (state of charge) of the battery, torque required by a driver and the state of the vehicle; secondly, determining a possible gear at a certain speed under the two conditions and the torque and rotational speed of an engine corresponding to each gear; and finally, determining a target gear under the condition of a minimum fuel consumption rate of the engine and determining whether to perform shift operation according to the time interval between two times of shift. The method has the advantages that in determining the state of the battery, the problem that the state of the battery is repetitively changed due to jump of the SOC is avoided by adopting the comprehensive judgment of values of the SOC (state of charge) of the battery, the torque required by the driver and the state of the vehicle; in determining the target gear, the target gear is determined from all possible gears under the condition of the minimum fuel consumption rate of the engine, and the fuel consumption at the target gear is guaranteed to be minimum; and whether to perform shift operation is determined according to the time interval between two times of shift, and thus frequent shift is avoided.

The invention provides a gear shifting control method of an automatic transmission based on forward road information. According to the slope angles of a plurality of points within a forward set distance, the road signs of the plurality of points within the forward set distance, the slope angle at the current driving time of a vehicle and the road sign at the current driving time of the vehicle, the gear control of the automatic transmission in an upslope preparing process, an upslope process, a slope crest process, a downslope preparing process, a downslope process and a slope bottom process is realized, so that the functions of upshifting in advance before going up the slope, avoiding frequent gear shift in the upslope process, making the automatic transmission to be neutral in advance before going down the slope and maintaining an engine at certain braking force in the downslope process are realized, and the automatic transmission is in the optimal gear, so that the fuel economy andthe dynamic property of the vehicle are increased.

The invention provides a continuous S-curve acceleration and deceleration motion control method and system, and electronic equipment. The continuous S-curve acceleration and deceleration motion control method comprises the steps that operation parameters are initialized, and the operation parameters at least comprise the initial speed, the target speed, the end speed, the target displacement and the next motion instruction type; the next motion instruction type is obtained, wherein the next motion instruction type comprises the conditions that both the initial speed and the end speed are equalto zero, the initial speed is not equal to zero and the end speed is equal to zero, or the target speed is equal to the end speed and is not equal to zero, and when the next motion instruction type is in the condition that both the initial speed and the end speed are equal to zero, planning is conducted according to seventh segments of an S-curve; when the next motion instruction type is in the condition that the initial speed is not equal to zero and the end speed is equal to zero, planning is conducted according to four rear segments of the S curve; and when the next motion instruction typeis in the condition that target speed is equal to the end speed and is not equal to zero, planning is conducted according to four front segments of the S curve or the four rear segments of the S curve. The multiple segments of trajectories of the S curve can be continuously planned, thus the multiple-segment speed is continuous, and the efficiency is improved.

A bicycle gear shift control system capable of avoiding frequent gear shifting includes: a power module; a microcomputer electrically connected to the power module for allowing a cyclist to switch between the automatic gear shifting mode and a manual gear shifting mode; a gear shifting driver electrically connected to the microcomputer, substantially connected to a derailleur, and instructed by the microcomputer to drive the derailleur to perform gear shift control; and a manual shifting controller electrically connected to the microcomputer. The microcomputer has an automatic gear shifting logic whereby the microcomputer determines the timing of automatic gear shifting and performs gear shifting. The microcomputer further has a gear shifting delay logic that involves delaying for a delay time interval from commencement of gear shifting according to a gear shifting criterion and ruling out all other gear shifting commands during the delay time interval.

The invention discloses a networked hybrid electric vehicle efficient energy management method considering road gradient. The method comprises the steps of modeling a parallel hybrid electric vehicle; predicting the speed of the networked hybrid electric vehicle; and carrying out an MPC energy management strategy based on ECMS. The influence of road gradient on energy management is considered, a time domain optimization problem is converted into a space domain problem, and a foundation is laid for designing the MPC energy management strategy based on ECMS; the influence of vehicle speed change on energy management optimization is considered, V2V communication information is fused, the vehicle speed is predicted within a prediction distance by a chain neural network, and the vehicle speed is applied to the ECMS-based MPC energy management strategy; the calculation efficiency and adaptability are improved, a gear shifting penalty factor is added into a target function, frequent gear shifting is avoided, and the driving performance is improved.

The invention discloses a method for controlling gear shifting of a vehicle. The method comprises the first step of detecting the times of the gear shifting and gear positions of the vehicle in first preset time, the second step of judging whether the vehicle enters a road jamming control mode or not according to the times of the gear shifting and the gear positions, the third step of controlling gears of the vehicle to be shifted from the current gear to a neutral gear or from the neutral gear to a preset gear when the vehicle enters the road jamming control mode. By means of the method, frequent gear shifting between a first gear and a second gear under the jamming city road situation is avoided, gear shifting pause brought by frequent gear shifting is avoided, meanwhile, excessive friction, between a first gear clutch and a second gear clutch, brought by the frequent gear shifting is eliminated, the service life of the clutches is prolonged, and the risks that the first gear clutch and the second gear clutch are burned are reduced.

The invention relates to the technical field of transmission control, in particular to a method and system for controlling parking and downshift of an automatic transmission. The method comprises the following steps: calling a shifting figure inquiring curve generated in advance, and obtaining the target gear of the current vehicle; monitoring and judging the deceleration of an output shaft of the transmission of the current vehicle or the deceleration of the whole vehicle; when the vehicle condition of emergent deceleration occurs, correcting the obtained target gear by calling a gear correction matrix, and thus obtaining the corrected target gear; according to the current gear of the vehicle and the corrected target gear, controlling the vehicle to execute gear shifting operation when a shifting delay time is achieved; when the vehicle condition without emergent deceleration occurs, continuing to execute the step of monitoring and judging the deceleration of the output shaft of the transmission of the current vehicle or the deceleration of the whole vehicle. Therefore, the shifting control for the automatic transmission in the parking and downshift process is realized, frequent shifting is effectively avoided, two-step shifting is switched into single-step shifting, the shifting time can be greatly shortened, and the shifting quality is improved.

The invention relates to a vehicle automatic lane changing control method and system, control equipment and a storage medium, and the method comprises the steps: obtaining a corresponding first targetdemand torque T0 and a virtual accelerator opening degree according to a target acceleration when a vehicle enters an adaptive cruise acceleration state; according to the virtual accelerator openingdegree, the current vehicle speed and the current gear, judging whether gear shifting is carried out when the vehicle executes automatic lane changing, if yes, adjusting the first target required torque T0 according to gear shifting information to obtain second target required torque T1, sending the second target required torque T1 to an engine control unit, and if not, sending the first target required torque T0 to an engine control unit. The system corresponds to the method, the control equipment and the storage medium comprise programs used for executing the method, and frequent gear shifting in the automatic lane changing process of the vehicle can be avoided.

The invention discloses a bicycle speed changing system with a function of preventing frequent gear shifting. The bicycle speed changing system comprises a power module, a microcomputer, a gear shifting driver and a manual shifting controller; the microcomputer is electrically connected to the power module, and an automatic gear shifting mode and a manual switching mode can be switched over by a rider via the microcomputer; the gear shifting controller is electrically connected with the microcomputer, is physically connected with a transmission and is controlled by the microcomputer to drive the transmission to change the speed of a bicycle; the manual shifting controller is electrically connected with the microcomputer; the microcomputer is provided with automatic gear shifting logic and can judge automatic gear shifting timing to perform gear shifting according to the automatic gear shifting logic; and the microcomputer is further provided with gear shifting delay logic, and the gear shifting delay logic includes that gear shifting is delayed by a delay time interval according to a gear shifting condition after a gear shifting instruction is generated, and all other gear shifting instructions are eliminated in the delay interval.

The invention provides a gear shift occasion judgment method and an automatic transmission system using the same. The gear shift occasion judgment method is mainly used for judging the gear shift occasion of at least one gear. The gear shift occasion judgment method specifically comprises the following steps: selecting a first expected value and a second expected value from a expected value range, wherein the first expected value is larger than the second expected value; extrapolating a gear-in critical value for entrance of the gear by utilizing the first expected value and the gear ratio of the gear; and extrapolating a gear-exit critical value for exiting to the gear by utilizing the second expected value and the gear ratio of the gear. By adopting the gear shift occasion judgment method, a user can shift the gear at an optimal occasion point in a driving process, the shortcoming of frequent gear shift is effectively improved, and the user can concentrate the attention on road condition and safety and does not need to divert the attention to operate the transmission system.

The invention discloses a climbing gear shifting strategy of a two-gear automatic transmission vehicle. The climbing gear shifting strategy of the two-gear automatic transmission vehicle comprises thefollowing steps that in the running process of the vehicle, in combination with the real-time rotating speed and torque of a driving motor and data of a ramp sensor, the mass of the vehicle in the current state is obtained through calculation by means of a vehicle dynamics model; the maximum vehicle speed Vmax which can be reached by each gear of the vehicle in the current state according to rampinformation and the mass of the current vehicle calculated in step 1 in combination with a driving Map theory of the vehicle driving motor; and a vehicle gear shifting strategy in the climbing process is selected according to the maximum vehicle speed Vmax calculated in step 2 and reference on the optimal gear shifting vehicle speed point of the vehicle. According to the climbing gear shifting strategy of the two-gear automatic transmission vehicle, the gear shifting strategy is simpler, gear selection is optimized, frequent gear shifting on a ramp is avoided, and driving comfort is improved.