176results about How to "Ensure braking safety" patented technology

The invention relates to the technical field of electric vehicles, specifically to a braking energy recovery control method and device of a rear wheel drive pure electric vehicle. The braking energy recovery control method of the rear wheel drive pure electric vehicle comprises the steps of a braking energy recovery mode judging step, a maximum regenerative braking force calculating step, a demandbraking force calculating step, a braking force distributing step and an anti-lock judging step; in the automobile braking process, distribution of a mechanical braking force and a regenerative braking force is controlled; on the basis of guaranteeing braking safety and braking efficiency, a regenerative braking force distribution coefficient is furthest increased; wasted energy in the braking process is sufficiently recovered by using the feeding capacity of a motor to charge a power battery; the braking energy recovery efficiency is enhanced; the braking energy loss is reduced; and the running range of the vehicle is optimized.

The invention relates to a braking system for an electric motor coach. A brake pedal signal switch, an accelerator pedal signal switch, a brake master cylinder pressure sensor, a gear sensor, a vehicle speed sensor, a motor revolution speed transducer, a battery management system, a sliding energy recovery control knob and a gas storage tank pressure sensor are in signal connection with a vehicle control unit respectively; the vehicle control unit is in signal connection with a motor controller, a voltage conversion direct current (DC)-alternating current (AC) unit and an anti-locked braking system respectively; and the voltage conversion DC-AC unit is in circuit connection with an electric air compressor which is in gas circuit connection with a braking gas storage tank, the gas storage tank pressure sensor is installed on the braking gas storage tank, and an energy unit circuit is connected with the battery management system. The invention further relates to a control method. The braking system for the electric motor coach is skillful in design, concise in structure, easy to implement, provided with an energy recovery function on the premise that the safety and the stability of the whole braking system are guaranteed, provided with good braking force distribution feature and braking foot feeling and suitable for large-scale popularization and application.

The invention discloses a brake control method for an electric vehicle use and a controlling device thereof, and belongs to the technical field of electric vehicles. The controlling device comprises wheels, wheel brakes, an electric-hydro complex brake ECU, a brake pedal, a brake pedal position sensor, a hydraulic control module, a hydraulic braking system, a motor, a battery, a vehicle speed sensor, a motor control module, an ABS control module, and wheel speed sensors. The method comprises the following steps: determining the braking purpose of a driver according to the driving state, the braking strength, and the state of the motor and the battery of the electric vehicle, determining and choosing a braking mode according to the braking purpose, the battery SOC value, and the state of the ABS, and conducting coordination control for the motor regenerative braking and the hydraulic braking to allow the electric vehicle to provide an excellent braking experience for the driver on the basis of guaranteeing the braking safety. Therefore, under the premise that the braking efficiency can be guaranteed, braking energies are recycled by utilizing the regenerative braking of the motor, and the energy utilization efficiency is improved.

The invention relates to an accelerator pedal and brake pedal-based electrically driven automobile feedback brake control method, which comprises the following steps of: (1) arranging an electrically driven automobile feedback brake control system comprising a vehicle controller, a wheel speed sensor, an accelerator pedal displacement sensor, a pressure regulator, a main cylinder pressure sensor, a front wheel cylinder pressure sensor and a brake pedal switch; (2) judging, by the vehicle controller, braking intention of a driver according to a current operation state of the automobile, dividing brake feedback control into three stages, i.e., an accelerator pedal-based feedback control stage, a brake pedal-based feedback control stage and a control stage of a switching process from accelerator pedal-based feedback to brake pedal-based feedback; and (3) calculating, by the electrically driven automobile feedback brake control system, motor feedback braking force of the three feedback control stages respectively, thereby keeping the vehicle total brake force consistent with the driver brake requirement. The accelerator pedal and brake pedal-based electrically driven automobile feedback brake control method can be widely applied to electrically driven automobile feedback brake control of a pure electric vehicle, a hybrid electric vehicle and the like.

The invention provides an automobile braking energy regeneration control system, which comprises a hydraulic accumulator, a variable displacement pump/motor, an electromagnetic clutch, a brake pedal switch, an acceleration pedal switch, a gear switch, a road grade sensor, a vehicle speed sensor, an accumulator pressure sensor, a hydraulic control unit and an electric control unit. The system automatically identifies the acceleration or braking intention of a driver, automatically determines the automobile running state and the road grade state, carries out braking energy recovery control and braking energy release control, thereby controlling the automobile to run stably and improving the recovery rate and the reproducibility of the braking energy.

The invention relates to a brake redundancy backup system suitable for automatic driving, and a brake method. A data acquisition sensor group is connected with an integrated electronic booster and a brake backup unit and is used for acquiring vehicle running state data; an automatic driving auxiliary subsystem is connected with the integrated electronic booster and the brake backup unit through anautomobile bus and is used for generating a brake instruction according to the vehicle running state data; the integrated electronic booster is connected with the four wheels and the two electronic parking actuators and used for responding to the braking instruction and conducting braking; and the brake backup unit is connected with the four wheels and the two electronic parking actuators and used for responding to a brake instruction and conducting braking when the integrated electronic booster breaks down. According to the system, the problem that in the related art, only research on backupof one aspect of electric power voltage buildup, ABS, electronic parking and the like is focused, and systematic integration of all functional modules and research on a highly redundant backup schemeare not performed can be solved.

The invention provides an electric vehicle regenerative braking energy coordinated recovery control method, which is based on a pure electric vehicle brake-by-wire system, and the energy is recoveredunder the coordinated control of the hydraulic braking torque of the brake-by-wire system and the feedback torque of a driving motor; the method comprises the following steps: 1, establishing a regenerative braking control system model; 2, modeling a driving motor and a battery; 3, designing a vehicle braking energy recovery controller; 4, selecting a control quantity and finishing control. According to the method, a regenerative braking control system model based on model predictive control is established; a brake energy recovery controller is designed; the hydraulic braking torque of the electro-hydraulic braking system and the feedback torque of the driving motor are selected as input of the controller, the hydraulic braking torque and the feedback torque of the driving motor are distributed in a coordinated mode to realize maximum braking energy recovery, such that the braking smoothness is guaranteed, the braking requirement of a driver is met, meanwhile, the front-back slippage rate is as small as possible, and the braking safety is guaranteed.

The invention discloses a compound braking system with a brake-by-wire function and belongs to the technical field of car braking. The compound braking system with the brake-by-wire function includesa brake pedal, a brake booster, a brake master cylinder, two-position five-way sliding valves, travel simulators, a hydraulic adjusting module (a motor, an oil pump, a high-pressure energy accumulator, two-position two-way electromagnetic valves and hydraulic adjusting cylinders), a pedal displacement sensor, pressure sensors and a brake controller. The compound braking system with the brake-by-wire function is characterized in that two independent hydraulic control mechanisms are integrated, the two-position five-way sliding valves are shifted, in normal situations, the electronic hydraulic braking system (EHB) generates hydraulic pressure through the motor, the pump, the electromagnetic valve and the hydraulic adjusting cylinders, and a traditional mechanical braking system is used underthe situation of system failure; the displacement sensor is mounted on the brake pedal and is used for determining the total braking force; the pressure sensors are mounted on front and back wheel pipelines to ensure real-time control on the hydraulic adjusting module. When normal braking is carried out, the pedal force is fed back by the travel simulators, and a mechanical structure of the braking system is decoupled.

The invention discloses an electric automobile regenerative braking force distribution method integrating road surface identification, and belongs to the field of electric automobile energy recovery. The method can ensure that a vehicle has good braking efficiency and obviously improves the energy recovery efficiency of the vehicle. The electric automobile regenerative braking force distribution method integrating road surface identification comprises the following steps: firstly, determining structural parameters of a whole automobile by establishing a vehicle model; obtaining three easily-obtained state information of a vehicle, like current longitudinal acceleration, lateral acceleration and front wheel rotation angle through a sensor, and obtaining a current road surface adhesion coefficient based on extended Kalman filtering estimation; then obtaining the current braking strength of the vehicle through calculation by a main cylinder pressure sensor, and judging whether the vehicle is in an emergency braking state or not; and if the vehicle is in a non-emergency state, under the premise of ensuring the driving safety of the vehicle, obtaining a front axle and rear axle braking force distribution coefficient based on table looking up of the magnitude of the road surface adhesion road surface and the braking strength, and then distributing the hydraulic braking force and the regenerative braking force by the front axle total braking force in a serial distribution mode.

The invention discloses a united brake system and a united brake method for a combination vehicle. The united brake system is composed of an air pressure braking system, a retarder system and an electronic control unit (ECU); the retarder system is installed on a trailer by improving an axle of the trailer, so that brake torque of a retarder is evenly distributed to a front axle and a rear axle of the trailer through a trailer transmission system, and brake stability is improved; when the combination vehicle travels normally, an air compressor and an auxiliary air source inject high-pressure air into a front air storage tank of a motor tractor, a rear air storage tank of the motor tractor and an air storage tank of the trailer through a pressure adjusting valve and a three-loop protective valve; power distribution can be controlled accurately through electric control, under the condition of ensuring the brake requirement of the combination vehicle, the retarder system is used as much as possible, brake loads of a main brake are reduced, a double-control brake valve is adopted, under the condition that the electronic control part fails, the air control part works normally, and therefore the normal brake requirement is not affected.

The invention provides a method and system for controlling the switching-on threshold value and the switching-off threshold value of a brake vacuum pump. The method comprises an information acquiring step and a threshold value setting step. According to the information acquiring step, at least the current vehicle speed information and brake information are acquired. According to the threshold setting step, the switching-on threshold value and the switching-off threshold value of the vacuum pump are set respectively at least according to the speed of a vehicle and the magnitude of brake signals through the current vehicle speed information and the brake information, and the working time of the vacuum pump is reduced under the premise that the braking safety is guaranteed. According to the method and system, the switching-on threshold value and the switching-off threshold value of the vacuum pump can be set according to the current vehicle speed information and the brake information, so that the various working conditions of the vehicle in the traveling process are fully considered; under the premise that the brake safety is absolutely guaranteed, the working time of the vacuum pump can be reduced to the greatest extent, the probability of breakdowns due to long-time working of the vacuum pump is lowered, and the service life of the vacuum pump is effectively prolonged.

The invention relates to a vacuum-servo and motor hybrid braking system of an electric automobile. The system comprises an automatic gearbox, a traction motor, a traction motor controller, a finished automobile controller, a vacuum pump, a braking pedal module, a braking liquid level sensor, a vacuum pump motor temperature sensor used to monitor temperatures of the vacuum pump, as well as a first linear vacuum sensor and a second linear vacuum sensor installed at an inlet of a vacuum tank, wherein a temperature signal output end of the vacuum pump motor temperature sensor, a linear vacuum signal output end of the first linear vacuum sensor, and a linear vacuum signal output end of the second linear vacuum sensor are connected to an analog acquisition channel of the finished automobile controller; and a braking liquid level signal output end of the braking liquid level sensor is connected to a digital quantity acquisition channel of the finished automobile controller. The system provided by the invention has higher reliability and can effectively avoid safety accidents.

The invention discloses an electromobile energy feedback braking and ABS (Anti-skid Brake System) integration hydraulic pressure unit. The input end of a first switch valve is connected with a front liquid outlet of a braking master cylinder, the output end of the first switch valve is connected with the input end of a first selection valve, the normally-opened output end of the first selection valve is connected with a first pressure charging valve, a second pressure charging valve and a first high pressure damper, and the normally-closed output end of the first selection valve is connected with a first pressure reducing valve, a second pressure reducing valve and a front wheel low pressure accumulator; the input end of a second switch valve is connected with a rear liquid outlet of the braking master cylinder, the output end of the second switch valve is connected with the input end of a second selection valve, the normally-opened output end of the second selection valve is connected with a third pressure charging valve, a fourth pressure charging valve and a second high pressure damper, and the normally-closed output end of the second selection valve is connected with a third pressure reducing valve, a fourth pressure reducing valve and a rear wheel low pressure accumulator; and a third switch valve is connected between the front wheel low pressure accumulator and a front wheel oil pump, and a fourth switch valve is connected between the rear wheel low pressure accumulator and a rear wheel oil pump. Due to the addition of the braking energy feedback function, the invention improves the continuous trip mileage of an electromobile and prolongs the service life of a braking system.

The invention relates to a regenerative braking torque distribution method of an all-wheel drive hybrid power system and belongs to the field of new energy automobiles. A finished automobile controller collects information of finished automobile system components and sets regenerative braking torque of an integrated starter generator (ISG) motor and a rear-drive motor, and energy utilization efficiencies of the system are improved on the premise that system safety is guaranteed. The regenerative braking torque distribution method has the advantages that the method is a controlling method capable of maximally recycling braking energy on the premise that braking safety of the vehicle system is guaranteed, and the energy recycling rate of the system is improved; and simultaneously, work of a hydraulic braking system and an anti-lock brake system (ABS) of a prototype automobile are not required to be changed, the braking energy recycling method based on the braking system and the ABS of the prototype automobile is provided, and vehicle braking safety performances of the hybrid power system are guaranteed.

The invention discloses a vacuum pump electronic controller, which comprises a pressure sensor used for detecting the air pressure in a vacuum tank in real time and outputting a corresponding air pressure actual value, a vibration sensor used for detecting the vibration amplitude of a vacuum pump in real time and outputting a corresponding vibration actual value, a control module electrically connected with the pressure sensor and the vibration sensor, a vacuum pump drive module bridged with a control module and a drive motor of the vacuum pump, and an alarm module electrically connected with the control module. The vacuum pump electronic controller stabilizes an air pressure value in the vacuum tank. In addition, a driver or passengers in a car can be reminded to find the vibration problem of the vacuum pump through an alarm manner, so that the braking safety and the reliability of a vacuum booster are ensured.

The invention relates to an electro-hydraulic compound brake system for recovering the braking energy of an electric fork-lift. The system comprises a suction filter, wherein the oil inlet of the suction filter extends into oil in a hydraulic oil tank, and the oil outlet of the suction filter is communicated with the oil inlet of a gear pump; the oil outlet of the gear pump is respectively communicated with the oil inlet of an overflow valve and the oil inlet of a one-way valve; the oil outlet of the overflow valve is respectively communicated with an oil return opening T1 of a three-position three-way full-hydraulic power brake valve and the hydraulic oil tank; the oil outlet of the one-way valve is respectively communicated with an energy accumulator and the oil inlet P1 of the three-position three-way full-hydraulic power brake valve; the oil outlet of the three-position three-way full-hydraulic power brake valve is connected with a service braking device; and a pedal angle sensor is connected with the brake pedal rotating shaft of the three-position three-way full-hydraulic power brake valve through a coupler. The electro-hydraulic compound brake system realizes maximized regenerating braking energyrecovery by coordinated control of electro-braking and hydraulic braking, so that braking safety is guaranteed, and energy utilization is improved.

The invention discloses a disc brake capable of detecting abrasion losses of a break lining block. The disc brake comprises a pliers body, a support, a brake disc and a break lining block, the pliers body is arranged on the support in a sliding mode, and a break gap automatic adjusting mechanism is connected between the pliers body and the support; and the disc brake further comprises a detection body, the length direction of the detection body and the axial direction of the break disc are identical, one end of the detection body is maintained on the support, the other end stretches out of the pliers body, and the detection body and the pliers body are connected in a sliding mode. According to the disc brake, the abrasion losses of the break lining block can be detected at any time by calculating the abrasion losses of the break lining block through the variable quantity of the stretching length of the detection body and break disc unilateral abrasion losses. Compared with prior limit abrasion loss sensors, the disc brake can help drivers to judge teal-time abrasion losses of the break lining block, the break lining block is changed in time before the break lining block is abraded to the limit under the condition that friction materials are fully used, the cost is reduced, and the break safety is guaranteed simultaneously.

The invention discloses a method and system for controlling a coasting with engine off condition at a neutral gear of a vehicle and the vehicle. The method comprises the steps that an effective brakemaster cylinder pressure signal is obtained, and it is determined whether the brake master cylinder pressure change rate meets a preset first preset condition or not; if yes, the vehicle is controlledto directly exit the coasting with engine off condition at the neutral gear; if not, it is determined whether the brake master cylinder pressure value meets a preset second preset condition or not; adriver brake intention is determined based on the brake master cylinder pressure signal, and it is determined that whether the vehicle does not exit the coasting with engine off condition at the neutral gear or directly exist the coasting with engine off condition at the neutral gear or exist the coasting with engine off condition at the neutral gear in a delayed mode based on the condition thatwhether the vehicle is in emergency or not. The driving comfort can be improved and fuel consumption can be effectively reduced under the condition of ensuring driving brake safety.

The invention provides a brake failure-preventing automatic compensation control method and system for a friction plate gap and a vehicle and belongs to the field of vehicle braking. The method comprises the steps of acquiring wheel speed data; recognizing a current traveling working condition of the vehicle according to the wheel speed data; and pressurizing a piston of a clamp of the brake according to the travelling working condition and pushing the piston of the clamp of the brake to reset. The system comprises a wheel speed acquisition unit for acquiring the wheel speed data, a working condition recognition unit for recognizing the current traveling working condition of the vehicle according to the wheel speed data and a friction plate gap compensation unit for pressurizing the pistonof the clamp of the brake according to the travelling working condition and pushing the piston of the clamp of the brake to reset. The working condition that the piston of the clamp retreats is recognized according to the wheel speed data and the piston of the clamp is pressurized periodically for friction plate gap compensation, so that it is ensured that the braking clamp is in a normal position or a position beneficial to emergency brake, the safety of the vehicle is ensured and panic of a driver is prevented.