289results about How to "Increased braking safety" patented technology

The invention relates to a coordinated braking control method of an electric automobile, which comprises the following steps of: 1. setting a coordinated braking control system; 2. when the automobile is under a braking or sliding condition, carrying out analysis processing on a braking command by whole automobile controller in the following conditions: (1) the dynamic coordinated control at the initial period of the common braking of a motor braking system and a hydraulic braking system; (2) the coordinated control giving priority to braking safety, i.e. under the condition of requiring larger braking torque; (3) the coordinated braking control giving priority to braking energy recovery, i.e. small-strength braking; and (4) a dynamic part, wherein the charge state of the battery and the rotating speed of a motor of the electric automobile are synthetically considered, when the charge state of the battery is higher and the battery does not need to be charged, the maximum braking torque provided by the motor is reduced, but the required braking torque is still provided by the motor; and 3. proportionally distributing the analysis results in the steps between the motor braking system and the hydraulic braking system to finally achieve the purpose of carrying out the coordinated braking control on the electric automobile.

The invention relates to a method for cooperatively controlling an air pressure and regenerative brake of a hybrid electric bus, which belongs to the technical field of new-energy vehicles. The method comprises the following steps of: firstly, collecting a current air pressure brake force, a brake pedal travel, a brake pedal travel speed, battery information, motor information and vehicle state information of a hybrid electric bus; secondly, distributing the air pressure brake force and a motor brake force by utilizing a regenerative brake force distribution algorithm; thirdly, cooperatively controlling regenerative brake and an ABS (Antilock Brake System) by utilizing a regenerative brake and ABS cooperative control algorithm; and fourthly, compensating and controlling the air pressure brake force by utilizing an air pressure brake force compensation control algorithm. By utilizing the invention, part resources of the common air pressure brake system and the regenerative brake system of the hybrid electric bus can be fully utilized, the brake energy can be recycled to the maximum extent, the economical efficiency of the entire bus is enhanced, and wheels can be prevented from locking so that the brake safety of the entire bus is improved.

The invention provides a braking control method of a vehicle. The vehicle comprises a motor and a mechanical braking mechanism. The method comprises the following steps of outputting the motor braking torque by the motor to brake the vehicle; in the process of braking, obtaining a wheel slip rate according to a speed signal and a wheel rotation speed signal; judging whether the wheel slip rate is within a preset range; if the wheel slip rate is not within the preset range, further judging whether the wheel slip rate is less than the lower limit of the preset range; if the wheel slip rate is less than the lower limit of the preset range, judging whether to increase the motor braking torque or combine with the mechanical braking mechanism to brake the vehicle to shorten the braking distance of the vehicle according to the motor braking torque and expected braking torque. By applying the method, the braking distance can be shortened to the maximum, and locking and slipping of wheels are avoided, so that the braking safety of the vehicle is improved. The invention also provides a braking control system of the vehicle.

The invention discloses an electric automobile regenerative braking control method. The electric automobile regenerative braking control method comprises the steps that a pavement characteristic valuecalculation method is established based on an attachment system, a semi-empirical mathematical model of an attachment coefficient and a sliding rate is established, a pavement state characteristic value is introduced, and the pavement condition and an average adhesion coefficient corresponding to the pavement are identified; the braking forces of the front and rear wheels are judged according tothe size of the adhesion coefficient and the brake strength; the braking strength, the battery SOC and the vehicle speed are used as inputs of a fuzzy controller, an empirical fuzzy rule is established, the proportion of the regenerative braking force to the front wheel braking force is output through the fuzzy controller, and the final regenerative braking force is obtained by comparing the regenerative braking force with the maximum torque output by the motor; and the maximum braking force which can be provided by the motor is determined according to the final regenerative braking force, andthe front wheel friction braking force is obtained. According to the electric automobile regenerative braking control method, on the premise that braking safety is guaranteed, front and rear wheel braking force, the motor braking force and the friction braking force are reasonably distributed according to different attachment coefficients, the braking energy recovery rate and the driving range are improved, and the braking safety is increased.

The invention relates to a device capable of comprehensively recovering brake energy and hanger bracket vibration energy belonging to the technical field of energy conservation and discharge reduction of the vehicle. On the one hand, the vibration of a hanger bracket drives a motor to move so as to convert vibration energy of the hanger bracket into electric energy to store into an energy storagesystem in normal driving process of the automobile; on the other hand, the device can recover a part of brake energy of the automobile, convert the brake energy into electric energy to store into theenergy storage system through the motor, and can restrain brake dive in the brake process of the automobile through transmission between the gears so that the automobile stably brakes when the car brakes and reduces speed; and the device can convert the stored electric energy into mechanical energy to provide to the vehicle when the automobile starts up or accelerates so as to save energy and ensure stable operation of the automobile.

The invention discloses a locking multi-mode lever-type variable valve driving system, belonging to the field of engine valve driving. The variable valve driving system mainly comprises a cam shaft, a mode input mechanism, a mode output mechanism, a mode switching mechanism, a valve regulating lever, a valve control mechanism and the like. By using the mode switching mechanism, the switching among multiple modes, including a two-stroke driving mode, a four-stroke driving mode, a two-stroke braking mode, a four-stroke braking mode and the like, of an engine is realized, further, by matching with the valve control mechanism for use, the optimum ventilation under different working conditions of the engine is finally realized, and the aims of comprehensively improving the engine dynamic property, fuel economy, emission performance and braking security are achieved. The invention is proposed by aiming at practical application, the reliability is high, the structure is compact, the requirements of a system on all the mechanisms are reduced, relatively mature technologies are adopted by all the mechanisms, the practical potential of the system in a short time is high, and the application prospect is good.

The invention discloses a range extended electric vehicle power system, which comprises a front axle, a rear axle, a front driving device, a rear driving device, a power coupling device, a controller, a storage battery group and the like, wherein the front driving device comprises a front driving motor, an internal combustion engine and a gearbox; the front driving motor is controlled by the controller; a front output shaft and a rear output shaft for outputting power to the front axle and the rear axle are arranged on the gearbox respectively; the front driving motor is a dynamo-electric all-in-one machine; and the internal combustion engine is connected with a power input end of the front driving motor through a clutch. The internal combustion engine can drive the front driving motor to generate power and directly participate in driving a vehicle, and a working point of the internal combustion engine is adjusted to be kept in a high-efficiency area through the front driving motor, so that the energy utilization rate of the internal combustion engine is improved, and the economical efficiency of the vehicle is improved. In addition, the four-wheel drive of the vehicle can be realized, the utilization rate of tire traction is improved, and due to the power coupling device, the rotating speed coupling or torque coupling of the front and rear power can be realized, and the power performance of the vehicle is improved.

The invention relates to a composite brake system and a method, aiming at providing a composite brake system with matching of compressed air and friction braking of an engine and a method. The system comprises a compressed air braking system connected to a high-pressure gas storage tank by a high-pressure pipeline and further comprises a friction type braking system, wherein the high-pressure pipeline is provided with an electromagnetic valve; an electric control unit (ECU) is connected with a brake pedal sensor, a vehicle operating state sensor, a compressed air braking system, the friction type braking system and the electromagnetic valve respectively by signal lines. Compared with a traditional braking technology, in the invention, more energy can be saved, the damage to a friction brake is reduced in long-slope braking, the declining of the braking force is avoided, and the braking safety is improved; valve control can be realized, the adjustment of the size of the compressed air braking force can be realized, and the application range of working condition of the compressed air braking is expanded; and a lock braking function can be realized when the compressed air braking and the friction braking works separately or jointly, so that the stability of a vehicle braking system is improved.

The invention relates to the field of motor control, and discloses a control method based on a hill descent control (HDC) system, the HDC system and an electric vehicle. The control method comprises:judging the state of the HDC system; under the condition that the HDC system is in a triggered state, determining a target braking torque based on a current speed of the electric vehicle and a targetspeed; comparing a target braking torque with a current maximum braking torque of a motor; and controlling the electric vehicle to brake through a motor feedback brake mode or a motor feedback and hydraulic hybrid brake mode according to a comparison result, and determining that the HDC system is in a trigger state under the condition that a trigger condition is met, wherein the HDC system is in astandby state, the depth signals of the accelerator pedal and the brake pedal are 0, the vehicle speed is within a preset speed range, and the electric vehicle is in an acceleration downhill state. According to the control method, the gradient sensor is not needed to collect the gradient, so that the abnormal HDC function caused by the abnormal signals collected by the gradient sensor can be prevented, and the stability of the braking system and the braking safety of the whole vehicle are greatly improved.

The invention provides an automatic steel backing plate broaching device, which comprises an upper die base, a movable supporting plate, a lower die base and a forming device, wherein the upper die base is provided with a guide post and a pressure spring; the movable supporting plate is respectively connected with the guide post and the pressure spring; the lower die base is parallel to the movable supporting plate at an interval; and the forming device comprises a blade fixing device, a blade, a press block, a slide block, a fixed block and a wedge, wherein the blade fixing device is arranged under the movable supporting plate; the blade is arranged in the blade fixing device, and the surface of the blade is provided with broached teeth; the press block is arranged on the upper die base and is inserted in the movable supporting plate; the slide block is arranged on the lower die base; the fixed block is arranged on the lower die base; and the wedge is arranged between the slide blockand the fixed block. The broached steel backing plate has high braking safety, and is more suitable for brake sheets of heavy-duty automobiles and trucks; and the product appearance and flatness are not influenced. A die processing mode is adopted, so the whole production process is more stable, the tooth root is firm and difficult to fall off, and the device is suitable for mass production.

The invention discloses a brake integrating a rotary barrel type eddy current retarder and a drum brake, wherein the brake is used for braking and speed reduction of an automobile. A retarder outer rotor, a brake drum and a coil support are coaxial, and the coil support is located between the retarder outer rotor and the brake drum. A plurality of magnet exciting coils provided with iron cores are fixed on the coil support and are evenly distributed along the circumferential direction of the outer circle of the brake drum, the axial leads of the magnet exciting coils are located in the radial direction of the brake drum, and first gas intervals are formed between the magnet exciting coils and the retarder outer rotor, and second gas intervals are formed between the magnet exciting coils and the brake drum. Two adjacent magnet exciting coils provided with the iron cores, facing to the same gas interval, are opposite in polarity. When the automobile speed is low, a brake shoe enables a friction liner to be pressed towards the brake drum to achieve friction braking; when the automobile runs at a normal automobile speed, the magnet exciting coils are powered on to produce electromagnetic braking torque to reduce the automobile speed, and then the automobile is braked through friction. When the automobile speed is high, electromagnetic braking and friction braking act in a combined mode. Braking thermal failure is avoided, and safety performance of automobile braking is improved.

The invention discloses a brake feedback control circuit of an electric vehicle. The control circuit comprises a controller, a power battery, a motor, a first DC (direct current) contactor and a second DC contactor, wherein the first DC contactor and the second DC contactor are used for controlling the on/off of the circuit between the power battery and the motor; a brake resistor is connected in parallel with the motor; and the brake resistor controls the on/off of the circuit between the brake resistor and the motor through a first DC contactor and a fuse. Through the brake feedback control circuit and method of an electric vehicle disclosed by the invention, the shortcoming that the electric vehicle cannot be braked when the power battery is sufficient is overcome, thereby improving the safety performance in braking the electric vehicle and avoiding influence on the driver caused by different brake feelings.

The invention provides a redundancy vacuum boost system for electric car braking based on dual electric vacuum pumps and belongs to the technical field of electric car braking. The solution comprisesa two-position three-way electromagnetic valve, a check valve, an electronic control unit, a vacuum tank, a vacuum degree sensor, a vacuum boost device, a storage battery, the two electric vacuum pumps, two relays and other components, wherein connection between the components is classified into air channel connection and circuit connection. When the electronic control unit judges that the first electric vacuum pump fails according to a vacuum degree value of the vacuum tank output by the vacuum degree sensor and working time of the electric vacuum pump, the electronic control unit can make the second electric vacuum pump work by controlling the two-position three-way electromagnetic valve, so working reliability of the vacuum boost system of an electric car can be enhanced; and braking safety of the electric car can be effectively enhanced; and in particular, braking efficiency of emergent braking can be increased.

The invention discloses an outside-disc inside-magnet disc brake. The outside-disc inside-magnet disc brake comprises a brake disc, a friction braking device and an electromagnetic braking device, wherein the brake disc is mounted on a rotary shaft, the friction braking device exerts contact braking torque on the brake disc, a round hole which is concentric with the brake disc is designed in the middle of the brake disc, the electromagnetic braking device exerts non-contact braking torque on the brake disc, the electromagnetic braking device comprises a rotor ring and a magnetic field generating body, the rotor ring is mounted on the round hole and rotates with the brake disc, the magnetic field generating body is located in the rotor ring, and a magnetic force line that is generated by the magnetic field generating body is cut when the rotor ring rotates with the brake disc. An electromagnetic braking area and a friction braking area on the brake disc are separated so that the problem that good friction rate, high magnetic permeability and low residual magnetism rate can not be simultaneously achieved is solved, moreover, the electromagnetic area is in a non-friction mode without abrasion, a friction disc is merely required to be replaced when replacing is required, resources are saved, and maintaining costs are lowered.

The invention discloses an automobile EBS system based on a braking main valve. The automobile EBS system comprises an EBS electronic control unit, the braking main valve, a front shaft braking air chamber, a rear shaft braking air chamber, a first electromagnetic valve assembly, a second electromagnetic valve assembly, a first proportional relay valve, a second proportional relay valve, an electromagnetic valve, a wheel speed detection device and a pressure sensor assembly. The braking main valve is provided with a first loop air outlet and a second loop air outlet. The front shaft braking air chamber is sequentially connected with the first electromagnetic valve assembly, the first proportional relay valve, the electromagnetic valve, the pressure sensor and the second loop air outlet through a control pipeline. The rear shaft braking air chamber is sequentially connected with the second electromagnetic valve assembly, the second proportional relay valve and the first loop air outlet through a control pipeline. The EBS electronic control unit is electrically connected with the braking main valve, the first electromagnetic valve assembly, the second electromagnetic valve assembly, the first proportional relay valve, a second proportional relay valve, the electromagnetic valve, the wheel speed detection device and the pressure sensor assembly. The automobile EBS system is low in cost and enables the arrangement difficulty of a whole automobile to be reduced.

The invention relates to a braking control system, method and device. The method comprises the steps that if recognizing a braking operating condition, an advanced driving auxiliary system sends braking requests to an electronic stability program (ESP) system and an electrical parking brake (EPB) system simultaneously; the ESP system executes a first brake according to the braking request sent by the advanced driving auxiliary system; the EPB system receives the braking request sent by the advanced driving auxiliary system, and a monitoring function to the ESP system is started; and if the EPB system monitors the situation that executing of the first brake by the ESP system fails, a preset braking mode is started, brake controlling is conducted on a vehicle through the EPB system. The braking control system, method and device can guarantee the braking effect and improve the safety of braking.

The invention relates to a vehicle brake control method and system, equipment and a medium. The method includes the steps that S1, a first acceleration when the pedal opening is zero is calculated; S2, when the first acceleration is less than or equal to the preset acceleration, the opening of a first pedal is calculated according to the current vehicle speed, the preset acceleration and the firstacceleration, the pedal opening is controlled as the opening of the first pedal, and otherwise, S3 is executed; S3, when a second acceleration corresponding to exhaust braking is equal to a difference between the preset acceleration and the first acceleration, the pedal opening is controlled as zero, exhaust braking is started, and otherwise, S4 is executed; S4, a third acceleration of a retarderwhen a control signal is maximum is calculated according to the current speed; and S5, when the third acceleration is less than or equal to a first difference value, a first control signal corresponding to a difference between the first acceleration of the current vehicle speed and the preset acceleration is calculated, the first control signal is used for controlling the retarder, the pedal opening is controlled as zero, and otherwise, the preset acceleration is sent to an EBS controller for braking.

The invention discloses an automobile integrated brake-by-wire system, and provides a brake system which can realize the brake-by-wire, can also realize conventional hydraulic brake when the brake-by-wire fails and simultaneously has the characteristics of short brake distance and small occupied space. The automobile integrated brake-by-wire system comprises an electronic control unit, a brake fluid tank, a pump, a brake main cylinder, a wheel brake and a brake pedal, wherein the brake pedal is provided with a stroke sensor, and a first brake passageway is connected with the brake main cylinder and the wheel brake; a second brake passageway is connected with the wheel brake and the brake fluid tank, two sides of a piston on the brake main cylinder are provided with a working cavity and a fluid complementing cavity, and the working cavity is internally provided with a first reset spring; the pump is positioned between the brake fluid tank and the brake main cylinder and is communicated with the brake fluid tank; a third brake passageway is respectively connected with the working cavity and the fluid complementing cavity through a pump outlet; and a fourth brake passageway is connected with the fluid complementing cavity and the brake fluid tank and is provided with a third electromagnetic switch valve.

The invention discloses a uniform type braking force balancing device and method of magnetic track brakes on both sides of a rail train. According to the uniform type braking force balancing device and method of the magnetic track brakes on both sides of the rail train, a front pressure sensor and a rear pressure sensor are arranged between force transmission boards of the magnetic track brakes and a force transmission column of a train steering rack; each magnetic brake is provided with six iron cores, and every iron core is wound with three coils; the rear end of the first coil of every iron core is directly connected with the negative electrode of storage batteries, the front end of the first coil of every iron core is connected with the positive electrode of the storage batteries through switches K4 and K1; the rear end of the second coil of every iron core is directly connected with the negative electrode of the storage batteries, and the front end of the second coil of every iron core is connected with the positive electrode of the storage batteries through switches K3 and K1; the front end of the third coil of every iron core is connected with the positive electrode of the storage batteries through switches K2 and K1, and the rear ends of the third coils of the six iron cores are connected with the negative electrode of the storage batteries through switches K5, K6, K7, K8, K9 and K10 respectively. The uniform type braking force balancing device and method of the magnetic track brakes on both sides of the rail train can effectively avoid brake deviation of the train due to the fact that the magnetic track brakes on both sides of the same steering rack generate overlarge brake force difference in different gear positions, and accordingly improves the braking safety of the rail train.