31results about How to "Improve emergency braking effect" patented technology

The invention discloses an automatic transmission gear shifting amendment control method for improving vehicle emergency braking performance. The automatic transmission gear shifting amendment control method is characterized in that when a vehicle provided with an automatic transmission is subjected to emergency braking, through gear amendment of the automatic transmission and rotating speed adjustment and the braking torque characteristic of an engine, the braking distance during vehicle emergency braking is shortened, and abrasion of a braking system is reduced.

The invention discloses a non-friction type brake which comprises a moving part, a braking part and a non-friction type braking mechanism. The moving part and the braking part are arranged together coaxially in a sleeved mode and are matched in a rotating mode. Wheel teeth are arranged on the rotating matching face of the braking part. The non-friction type braking mechanism comprises a floating block which is arranged on the rotating matching face of the moving part in a floating mode in the radial direction and is in meshing transmission with the wheel teeth. The tangential direction angle of the action points of the floating block and the wheel teeth is continuously changeable. The non-friction type braking mechanism is of a transmission structure in which the floating block and the wheel teeth are matched, meanwhile, the tangential direction angle of the action points of the floating block and the wheel teeth is continuously changeable in a certain range, continuously-changeable joining force is generated, when the tangential direction angle is large, equal-torque output can be achieved, torque transmission capacity is high, vehicle braking distance is shortened, emergency braking performance is improved, meanwhile, the floating block and the wheel teeth are matched in a non-friction mode, the problem that due to part abrasion, maintaining is frequent, and service life is short can be avoided, and operation cost is lowered.

The invention discloses an emergency braking device for an elevator. The device comprises an elevator car, a traction steel rope is fixedly connected to the top of the elevator car, the part, on the two sides of the traction steel rope, of the top of the elevator car are fixedly connected with heightening blocks, sensing devices are arranged above the heightening blocks, the two sides of the elevator car are provided with braking positioning devices, and the braking positioning devices are installed in elevator shafts; and each sensing device comprises a first round pipe, the bottom of each first round pipe is fixedly connected to one corresponding heightening block, round rods are inserted into the first round pipes, one end of each round rod extends to one side of the traction steel rope, the end, close to the traction steel rope, of each round rod is movably connected with a rolling wheel, each rolling wheel is tangent to the traction steel rope, and a baffle sleeves the rod wall ofthe end, close to the traction steel rope, of each round rod. According to the emergency braking device for the elevator, the falling potential energy of the elevator car is buffered through a top end buffering device and a bottom buffering device, and the elevator car is stopped finally, and casualties caused by immediate falling of the car are avoided.

The invention discloses an engineering vehicle chassis brake control system and a crane, and relates to the technical field of engineering vehicles. The technical problem that braking capacity in the prior art is poor is solved. The engineering vehicle chassis brake control system comprises a foot brake valve, a first foot relay valve, a three-shaft left brake chamber, a three-shaft right brake chamber and a first air tank, and an air inlet of the first foot relay valve is communicated with an air outlet of the first air tank. One of two air outlets of the first foot relay valve is communicated with a travelling brake airflow inlet of the three-shaft left brake chamber. The other of the two air outlets of the first foot relay valve is communicated with a travelling brake airflow inlet of the three-shaft right brake chamber. The crane comprises a rear axle brake air path, and the rear axle brake air path comprises the engineering vehicle chassis brake control system. The engineering vehicle chassis brake control system and the crane are used for improving the brake performance of the chassis brake control system of the crane.

A novel air purification device comprises a fixed frame and a rotary impeller. The four corners of the left end face and the right end face of the fixed frame are provided with fixed corners at the same time. A bolt hole is formed in each fixed corner. A rotary groove with a downward through opening is formed in the fixed frame, wherein the rotary groove extends upwards. A through connection shaft is rotationally mounted at the lower end of the rotary groove. The rotary impeller is mounted on the through connection shaft. A placement cavity is formed in the position, located on the right side of the rotary groove, in the fixed frame. The right end of the through connection shaft extends into the placement cavity and is fixedly provided with a second tooth wheel. A first tooth wheel connected with the second tooth wheel in a matched manner is further mounted in the placement cavity. A first motor is fixedly mounted at the right end of the placement cavity. The first tooth wheel is fixedly connected with a conveying shaft of the first motor. A bearing device is arranged on the outer side of the first motor and comprises vibration removal thick plates and heat reduction aluminum sheets.

An environment-friendly de-dusting device comprises a de-dusting frame and a cleaning wheel. The circumference of the cleaning wheel is sleeved with a cleaning brush. An installation plate is arranged above the de-dusting frame. The de-dusting frame and the installation plate are fixedly connected via a fixing pole. A middle end groove with a downward opening and elongated upwards is disposed in the de-dusting frame. A steering shaft is installed on the lower end of the middle end groove in a steerable manner. The cleaning wheel is mounted on the steering shaft. A placement chamber is arranged in the de-dusting frame and on the right side of the middle end groove. The right end of the steering shaft is elongated into the placement chamber and is fixedly provided with a second gear. A first gear which is connected with the second gear is installed in the placement chamber. A first electric motor is fixedly installed on the right end of the placement chamber. The first gear is fixedly connected to the transmission shaft of the first electric motor.

The invention provides an active braking system capable of realizing autonomous emergency braking. The active braking system comprises a high-pressure oil supply unit and a dual-channel braking wheel cylinder. The high-pressure oil supply unit is connected to the braking wheel cylinder through an active braking pipeline and a conventional braking pipeline. The active braking pipeline is provided with a second switch solenoid valve and a one-way valve. The conventional braking pipeline is provided with an anti-lock braking system. An oil storage cup is connected between the high-pressure oil supply unit and the anti-lock braking system through a pipeline and mounted on the top of a braking master cylinder. The active braking pipeline and the braking wheel cylinder are each provided with a hydraulic signal collector. A first oil hole and a second oil hole are formed in the braking wheel cylinder. The second oil hole and a first switch solenoid valve are integrated in the braking wheel cylinder. The anti-lock braking system comprises a three-position three-way solenoid valve. The first switch solenoid valve, the second switch solenoid valve, the three-position three-way solenoid valve and the hydraulic signal collectors are connected with a braking controller. The response time of the active braking system can be shortened, and the emergency braking performance is thus improved.

The invention discloses a distributed drive electric automobile brake anti-lock control method and system. The method comprises the following steps: filtering the current speed of an automobile by adopting unscented Kalman filtering; determining the current slip rate of each wheel according to the current speed of the automobile; calculating the current utilization adhesion coefficient of each wheel of the automobile; inputting the current slip rate and the current utilization attachment coefficient into an adaptive neural network model to obtain the optimal slip rate and the maximum utilization attachment coefficient of the current pavement; according to Thb = (mumaxFz-Freg) r, calculating the magnitude of braking torque Thb, needing to be provided by a hydraulic braking system, of each wheel to be recorded as first braking torque; according to Teb = TSMC-Thb, calculating the magnitude of the braking torque Teb, needing to be provided by a hub motor of each wheel, of each wheel to berecorded as a second braking torque; and in the anti-lock braking process of the automobile, controlling the braking torque output by the hydraulic braking system and the braking torque output by eachwheel hub motor according to the first braking torque and the second braking torque. The emergency braking effect is improved.

The invention discloses an air purifying device which comprises a fixing frame and a rotating impeller. Fixing corners are simultaneously arranged at the four corners of the left end face and the right end face of the fixing frame. Bolt holes are formed in the fixing corners. A rotating groove extending upwards is formed in the fixing frame, wherein a through opening of the rotating groove faces downwards. The lower end of the rotating groove is rotationally provided with a rotating shaft, and the rotating impeller is installed on the rotating shaft. A containing cavity is formed in the position, located on the right side of the rotating groove, in the fixing frame. The right end of the rotating shaft extends in the containing cavity and is fixedly provided with a second cone tooth wheel, and a first tooth wheel cooperatively connected with the second tooth wheel is further installed in the containing cavity. A first motor is fixedly installed at the right end of the containing cavity, and the first tooth wheel is fixedly connected with a transmission shaft of the first motor.

The invention discloses a high-dynamic-response flux-weakening speed extension method of a permanent magnet synchronous motor, comprising the steps of comparing, by a flux-weakening function module, omega<*> and omega continuously with omega<*> and omega; if comparison results meet a condition, allowing an enable signal ENABLE to be 1, and enabling a d-axis speed regulator to finish a function where when it is given according to an error of omega<*> and omega that d-axis current given i<*><d> does not meet the condition, not activating the enable signal, wherein the d-axis current given i<*><d>=0 is vector having traditional d-axis current being zero; subjecting d-axis and q-axis current given i<*><d> and i<*><q> respectively to d-axis and q-axis current regulators, calculating with the regulators to give d-axis voltage u<d1> and q-axis voltage u<q1>, and processing the d-axis voltage u<d1> and q-axis voltage u<q1>, by a synthetic voltage amplitude-limiting module with d-axis voltage reserving, to obtain u<d> and u<q>. The method has the advantages that high-dynamic flux-weakening speed extension control similar to traditional vector control in speed loop performance can beprovided, no oscillations occur during the control process, and the high-dynamic flux-weakening speed extension control and the traditional vector control can be seamlessly switched.