7results about How to "Improve driving quality" patented technology

The embodiment of the invention discloses a path planning method and device, equipment and a storage medium. Comprising the following steps: acquiring a current driving state and a current planned path of a vehicle, and acquiring real-time traffic data corresponding to the current planned path according to the current planned path; determining a current congestion state and an estimated congestion state corresponding to the current planned path according to the current driving state and the real-time traffic data; and determining a target planned path of the vehicle according to the current congestion state and the estimated congestion state. According to the invention, comprehensive, rapid and predictive planning for the vehicle driving path is realized, and the change of the congestion state of the road section in the vehicle driving process is fully considered, so that the planned path can help the vehicle to better avoid the congestion road section, and the driving travel quality is improved.

The present disclosure relates to a wheel speed difference control method and system, a vehicle control unit, an electric vehicle and a medium. The wheel speed difference control method comprises: obtaining a current vehicle speed, a current wheel speed and a current actual output torque of an electric motor; calculating a wheel speed difference between a driving wheel and a following wheel according to the current wheel speed; judging whether to activate a torque pullback function according to the current vehicle speed and the wheel speed difference; determining a target counter-drag torque according to the current actual output torque of the electric motor and a pullback coefficient in the case that the torque pullback function is activated; and requesting the target counter-drag torque to an electric motor controller. The present disclosure can monitor the wheel speed difference trend in real time, and smoothly reduce the wheel speed difference before the ABS is triggered by intelligently adjusting the request strategy of the counter-drag torque, thereby ensuring the continuity and efficiency of the energy recovery process, and improving the driving quality.

The invention provides an electric vehicle power limiting method and system based on an advanced power reduction strategy. The method comprises the following steps that the numerical value interval where the lowest battery cell voltage of a battery pack is located is judged in real time; if the lowest cell voltage is in the first interval, the power limiting operation is not executed; if the lowest cell voltage is in a second interval, executing a linear power reduction operation; if the lowest cell voltage is in a third interval, reducing the power to a first set value according to a set power reduction rate; if the lowest cell voltage is in a fourth interval, instantly reducing the power to a second set value; wherein the first interval, the second interval, the third interval and the fourth interval are continuous and full-range coverage intervals from large to small in sequence. The driving experience of a vehicle owner is improved, and irreversible damage caused by over-discharge of the battery is avoided.

The invention discloses a hydraulic control system suitable for a small-tonnage forklift, a gear shifting method and a gearbox assembly. The system comprises a forward clutch, a backward clutch, an inching valve, a two-way buffer and an electromagnetic reversing valve. The gear shifting oil way sequentially passes through the inching valve and the electromagnetic reversing valve and then enters the forward clutch and the backward clutch. A bidirectional buffer is connected in series to an oil path entering the forward clutch and the backward clutch; the bidirectional buffer comprises a cavity, an elastic piece, a first piston and a second piston, wherein the elastic piece, the first piston and the second piston are located in the cavity. The first piston and the second piston are fixedly connected with the two ends of the elastic piece correspondingly and divide the cavity into an advancing cavity and a retreating cavity. The elastic piece is matched with the first piston and the second piston, so that the first piston and the second piston can slide in the cavity, and power crossing in the gear switching process can be reduced, so that more gentle gear shifting is achieved.

The invention discloses a lithium battery charging and discharging current control method. The method comprises the following steps: acquiring a multi-layer pulse current table; calculating weighted average current capable of reflecting the polarization state of the battery in real time; comparing the weighted average current with a continuous current threshold value, deciding smooth switching among different ampere meters through a dynamic current buffer threshold value, and outputting a first current limit value; calculating a second current limit value based on the deviation between the monomer voltage and the safety threshold; and finally taking a small value of the two values, and reporting the result as a charge-discharge current limit value. According to the method, complex integral operation is avoided, polarization and depolarization characteristics of the battery are fitted, smooth and safe control of charging and discharging current is realized, and the calculation burden is remarkably reduced.

The application discloses a self-adaptive tooth entering transition device, a rack rail track and a transition system. The self-adaptive tooth entering transition device comprises a transition section, which is arranged in front of a rack rail section and is used to drive a train gear to rotate to the same linear speed as a train steel wheel. Before the train enters the rack rail from the general rail, the train gear is driven to rotate in advance in the transition section, and the linear speed of the train gear is made to be the same as the linear speed of the train steel wheel. When the train enters the rack rail section, the direct engagement with the rack rail can be realized, so that the impact and abrasion of the rack rail section during the tooth entering are avoided, the efficiency and stability of the rack rail vehicle when entering the rack rail section are improved, and the self-adaptive tooth entering transition device has important popularization significance.

The invention relates to a vehicle wheel end torque self-calibration method, device and equipment and a storage medium. According to the main technical scheme, the method comprises the steps that an upper computer responds to a vehicle basic state signal sent by a vehicle controller, and whether basic calibration conditions are met or not is determined according to the vehicle basic state signal; if yes, the upper computer sends a calibration instruction signal to a vehicle controller; the vehicle controller responds to the calibration instruction signal sent by the upper computer, performs self-calibration operation according to the calibration instruction signal to obtain self-calibration state information, and feeds back the self-calibration state information to the upper computer; and the upper computer receives the self-calibration state information and sends the self-calibration state information to a human-computer interaction interface to prompt an operator to confirm the self-calibration state information. Through cooperation of the upper computer and the vehicle controller, self-calibration operation of the vehicle wheel end torque is achieved, and the effects of improving the control precision and the control stability of the vehicle and improving the driving texture and the safety performance of the vehicle are achieved.