161results about "Hydrodynamic brakes" patented technology

The invention relates to a drive train (100) and a hydrodynamic brake (9) for this drive train for a motor vehicle, in particular a truck, with at least one electrically driven drive axle (1) by means of at least one electric motor (4, 5) and two drive shafts (2, 3) each containing at least one drive wheel (6, 7). In order to operate the motor vehicle economically and with a weight-reduced design, at least one electric motor (4, 5) arranged close to the wheel is assigned to each drive shaft (2, 3) and a hydrodynamic brake (9) is arranged between the drive shafts (4, 5).

The invention discloses a heavy truck hydraulic retarder control method and system and a vehicle, and belongs to the technical field of retarder control. The method comprises the steps that the target braking torque value of a retarder is read; if the target braking torque value is larger than or equal to the maximum output torque value, the target braking torque value is set to be the maximum output torque value; if yes, the target braking torque value is dynamically compensated; calculating a target working pressure value of the retarder cavity; and the deviation between the target working pressure value of the retarder containing cavity and the current working pressure and the deviation between the proportional valve target and the actual current are calculated, calculation is conducted through a PID controller, and the output serves as the input of the retarder proportional valve so as to control the output torque of the retarder. According to the invention, the output torque delay can be reduced so as to improve the braking performance of the retarder, the braking precision and stability are relatively high, and relatively stable braking can be maintained under the conditions of different vehicle speeds and different oil temperatures.

The invention provides a hydraulic retarder system and method and a vehicle with the hydraulic retarder system. The hydrodynamic retarder system comprises a hydrodynamic retarder, a hydraulic control system and a control system, wherein the hydrodynamic retarder is provided with a retarder working cavity; a third oil inlet of the oil guide device is communicated with a second oil outlet of the retarder working cavity, and a third oil outlet of the oil guide device is communicated with a second oil inlet of the retarder working cavity; a fourth oil inlet of the heat energy conversion device is communicated with a fifth oil outlet of the oil liquid guide device, a fourth oil outlet of the heat energy conversion device is communicated with a fifth oil inlet of the oil liquid guide device, and the heat energy conversion device is electrically connected with external equipment. And the heat energy conversion device is used for converting heat energy generated by the hot oil into electric energy for external equipment to use. The energy utilization efficiency of the system is improved, remarkable economic and environmental benefits are brought, and the problem that in the prior art, the braking torque gear of the hydraulic retarder is difficult to meet the requirements under different working conditions is solved.

The invention relates to a braking device (10) for a motor vehicle with a fluid path (12) through which a fluid can flow and which has at least two line sections (14, 16), in which at least one pump element (18) and at least one valve device (34) which has a valve inlet (26) and a valve outlet (28) and which can be moved between at least two valve positions (30, 32) is arranged, wherein the valve device is fluidically connected to the pump element (18) via the valve inlet (26) by means of a first of the line sections (14), with a retarder (38), which has a stator (40), a rotor (42) and a retarder inlet (44), via which the retarder (38) is fluidically connected to the valve device (34) by means of the second of the line sections (16) via the valve outlet (28), wherein in a first of the valve positions (30) the valve inlet (26) is fluidically connected to the valve outlet (28) and in the second valve position (32) the valve inlet (26) is not fluidically connected to the valve outlet (28).

The invention relates to the field of vehicle control, in particular to a vehicle downhill constant-speed control method and system based on a hydraulic retarder and a storage medium. According to the ramp information and the state information of the vehicle, fitting wind resistance and road resistance coefficients of the vehicle based on a least square method; according to the wind resistance and road resistance coefficient and ramp information of the vehicle, first target brake pressure of a hydraulic retarder controller and second target brake pressure of a hydraulic retarder are calculated; calculating a proportional valve control input value, wherein the hydraulic retarder controls the vehicle speed based on the proportional valve control input value; the first target brake pressure and the second target brake pressure of the hydrodynamic retarder are calculated by fitting the wind resistance coefficient of the vehicle and the road resistance coefficient, the pressure of the working cavity is adjusted through the input value of the pressure closed-loop control proportional valve, and the precision and stability of vehicle downhill constant-speed control are remarkably improved; and it is ensured that the vehicle can still rapidly and stably maintain the target vehicle speed when the gradient changes, and the driving safety and comfort are greatly optimized.

The invention relates to a braking device (10) with a fluid path (12) through which a fluid can flow and which has two line sections (14, 16), in which a pump element (18), a cooler (64) and a valve device (34) which has a valve inlet (26) and a valve outlet (28) and which can be moved between two valve positions (30, 32) is arranged, wherein the valve device is fluidically connected to the pump element (18) via the valve inlet (26) by means of a first of the line sections (14), with a hydraulic sump (80) fluidically connected to the fluid path (12), with a retarder (38), which has a stator (40), a rotor (42) and a retarder inlet (44), wherein the valve inlet (26) is fluidically connected to the valve outlet (28) in a first of the valve positions (30), whereby the fluid flowing through the first line section (14) can be conveyed through the valve device (34) to the retarder inlet (44) via the second line section (16), and the valve inlet (26) is not fluidically connected to the valve outlet (28) in the second valve position (32).

The invention discloses a control method of a proportional electromagnetic valve for a hydraulic retarder. The control method mainly solves the technical problems that an existing control method is long in pressure response time, large in overshoot, poor in following performance and the like. The control method comprises the steps that feedback pressure of a working cavity of the hydraulic retarder and input signals of a proportional electromagnetic valve are periodically collected; the current target pressure request state is judged, and the current target current of the proportional electromagnetic valve is calculated in a corresponding mode according to the judgment result; calculating to obtain the current duty ratio of the proportional electromagnetic valve; and finally, the flutter is superposed, and the final duty ratio is output, so that the control of the proportional electromagnetic valve for the hydraulic retarder is realized. According to the control method, accurate control over the proportional electromagnetic valve can be achieved, and the control method has the advantages of being short in response time, small in overshoot and good in following performance.

The present invention relates to a resistor unit (1, 1', 1''), comprising: at least one electrical resistor (10), at least one fluid-carrying cooling unit (30) on and / or in which at least part of the at least one electrical resistor (10) is arranged, at least one detection unit (3, 4, 5, 6, 7, 71, 72) and at least one evaluation device (40) that can be operatively connected to the at least one detection unit (3, 4, 5, 6, 7, 71, 72), the at least one detection unit (3, 4, 5, 6, 7, 71, 72) being configured to measure a variable that represents the temperature (TR) of the at least one electrical resistor (10) per se or in combination with a further detection unit (3, 4, 5, 6, 7, 71, 72) and that relates to an electrical property of the at least one electrical resistor (10) and / or to a property of a fluid flowing through the fluid-carrying cooling unit (30). The present invention additionally relates to a brake system and to a vehicle having such a resistor unit and to a method for estimating a temperature of the fluid-cooled electrical resistor.

The invention relates to the field of hydraulic retarders, in particular to a hydraulic retarder high-frequency proportional valve which comprises a valve seat, a protective cover is mounted above the valve seat, an ECU control connector is mounted on one side of the protective cover, a sealing ring is attached between the protective cover and the valve seat, and a heat insulation pad is mounted at the bottom of the valve seat. Through high-frequency cooperation of one group of static iron core and the movable iron core, gas can flow into the gas outlet from the gas inlet, and when the gas pressure is large, through high-frequency cooperation of the other group of static iron core and the movable iron core, part of the gas can be discharged in a one-way mode along a one-way valve cavity while the gas can be discharged along the gas outlet; the control mode that high-frequency control of the two sets of static iron cores and the movable iron core is matched with detection of the pressure sensor is adopted, the whole structure is simple, meanwhile, the valve seat has the advantages of being rapid and sensitive in adjustment reaction and low in noise, and it can be guaranteed that the working condition temperature in the valve seat is stable by being matched with a heat insulation pad at the bottom.

The device (100) comprises a magnetorheological transmission device (1) with two rotating components (2, 3) movable relative to each other. A working gap (4) containing a magnetorheological medium (5) is formed between the rotating components (2, 3). An electrical coil assembly (6) serves to generate a controllable magnetic field in the working gap (4). An auxiliary brake (7) serves to brake the rotation of the rotating components (2, 3) when the magnetic field of the coil assembly (6) is lost. The auxiliary brake (7) comprises a magnetic assembly (17) extending in the circumferential direction of the working gap (4), which includes at least one magnetic unit (27) with at least one permanent magnet (37) extending only over a portion of its circumference.

A method for controlling the switching on and off of a hydrodynamic retarder in a motor vehicle powertrain is proposed, wherein the hydrodynamic retarder comprises a rotor arranged on a retarder shaft and a coupling device with an actuating device by means of which a coupling element can be switched from an open position to a closed position, wherein a control is provided by means of which the position of the coupling element can be controlled. According to the invention, it is proposed that, when the motor vehicle is stationary, the control system generates in a first step an intermediate signal, 0 or 1, based on switch-on criteria and a switching signal, 0 or 1, based on switch-off criteria, wherein in a second step a decision signal, 0 or 1, is generated based on the intermediate signal and the switching signal, by means of which the actuator is controlled and thus switched either to the open position or the closed position.

A control air system is proposed, having a venting channel, which is connected to a venting connection, a pressure regulating channel, which is connected to the regulating pressure connection, a pressure channel, having a plurality of sections, which is able to be connected to a compressed air connection, and a switching valve via which a connection between pressure regulating channel and venting channel can be switched in a first switching position and a connection between pressure regulating channel and pressure channel can be switched in a second switching position. According to the invention, it is proposed that a booster valve, by means of which the switching valve can be switched from the first switching position into the second switching position, is provided in the pressure channel.

The invention relates to a braking device (10), comprising: a fluid path (12) through which a fluid can flow, having two line sections (14, 16), and in which a pump element (18), a cooler (64) and a valve device (34) are arranged, which valve device has a valve inlet (26) and a valve outlet (28) and can be moved between two valve positions (30, 32), and which is fluidically connected to the pump element (18) via the valve inlet (26) by means of a first of the line sections (14); a hydraulic sump (80) fluidically connected to the fluid path (12); a retarder (38) having a stator (40), a rotor (42) and a retarder inlet (44), wherein the valve inlet (26) is fluidically connected to the valve outlet (28) in a first of the valve positions (30), whereby the fluid flowing through the first line section (14) can be supplied through the valve device (34), via the second line section (16), to the retarder inlet (44), and the valve inlet (26) is not fluidically connected to the valve outlet (28) in the second valve position (32).

The invention relates to an oil supply device for an automatic transmission or an automatic shifting transmission in a drive train, the oil supply device comprising an oil sump and a heat exchanger, wherein the oil supply device is provided for at least the following operating states of the automatic transmission: torque converter operation; driving operation using one of the mechanical gears; retarder operation. In order to optimize the cooling of the oil volume flow in different operating states, according to the invention, two heat exchangers (11, 12) are provided, through which the oil volume flow can be conveyed, respectively, depending on the operating state of the automatic transmission.

The invention relates to a device (100) comprising a magnetorheological transmission device (1) having two rotating parts (2, 3) which can be moved relative to each other. A working gap (4) having a magnetorheological medium (5) is formed between the rotating parts (2, 3). An electrical coil arrangement (6) is used to generate a controllable magnetic field in the working gap (4). The additional brake (7) is used to brake the rotational ability of the rotating members (2, 3) when the magnetic field of the coil mechanism (6) disappears. The additional brake (7) comprises a magnet device (17) extending in the circumferential direction of the working gap (4), which magnet device comprises at least one magnet unit (27) having at least one permanent magnet (37) extending only over a part of the circumference.

The invention relates to a hydraulic retarder connected to the front end of a gearbox in parallel and a torque control method thereof.The hydraulic retarder comprises a retarder shell, a retarder front cover and a retarder rear cover, the retarder front cover and the retarder rear cover are installed on the two sides of the retarder shell, and a working cavity and a gear train transmission mechanism are installed in the retarder shell; the gear train transmission mechanism comprises a driving wheel connected with the working cavity, a driving wheel in constant meshing connection with the driving wheel, a first retarder shaft and a second retarder shaft, the first retarder shaft and the second retarder shaft are coaxially installed with the driving wheel, the first retarder shaft penetrates through the front retarder cover and then is connected with the engine, and the second retarder shaft penetrates through the rear retarder cover and then is connected with the gearbox. The hydrodynamic retarder is connected to the input end of the gearbox in parallel, the speed ratio of different gears of the gearbox and the speed ratio of the retarder are utilized, the speed increasing and torque increasing adjusting range of the hydrodynamic retarder is enlarged, the hydrodynamic retarder can play a role in braking when a vehicle goes down a slope at a low speed, and the speed increasing and torque increasing effects of the vehicle are improved. And the optimal braking effect of the hydraulic retarder is achieved by adjusting the gear of the gearbox.

According to the multi-medium circulating system based on the hydraulic retarder, a large circulating oil way, a small circulating oil way and an exhaust passage are highly integrated on a retarder shell and a heat exchanger bottom plate, and the large circulating oil way and the small circulating oil way share a large circulating oil outlet channel, a small circulating oil outlet channel and a heat exchanger; an oil outlet exhaust passage, a large-small circulation oil outlet passage and a heat exchanger bottom plate covered channel form an independent exhaust passage, so that gas and oil media achieve efficient cooperation in large-small circulation and exhaust circulation, and meanwhile all-working-condition performance optimization of high torque precision and high continuous braking capacity under the braking working condition and low air loss and low temperature under the idling working condition is achieved. Meanwhile, the oil way is integrally formed on the inner side of the retarder shell, so that the sealing reliability and the structural strength of the system are remarkably improved; the oil leakage and oil pumping faults of the oil duct are completely eradicated from the source, the idling loss and the working temperature are remarkably reduced, the torque control precision is improved, the system integration degree and the operation reliability are improved, and cost reduction and efficiency improvement are achieved.

The invention provides a disconnected hydrodynamic retarder control system and method and a vehicle with the disconnected hydrodynamic retarder control system. The disconnected type hydrodynamic retarder control system comprises a hydrodynamic retarder and a control system, wherein the hydrodynamic retarder is provided with a rotor; the first end of the gear shifting part is movably connected with the rotor, and the second end of the gear shifting part is connected with an output shaft of the transmission; and the adjusting part is connected with the hydraulic retarder, the execution end of the adjusting part is connected with the gear shifting part, and the adjusting part is used for adjusting the rotating speed difference between the output shaft and the rotor. By introducing the gear shifting part and combining intelligent control of the controller, the hydraulic retarder can be adjusted to a proper gear according to different working conditions of a vehicle, flexible adjustment of the braking torque is achieved, mild braking force can be provided in the urban congestion environment, and the braking torque can be adjusted to the proper gear according to the different working conditions of the vehicle. And a stronger braking effect can be provided under the high-speed driving conditions such as long downhill, and the problem that the braking torque gear of the hydraulic retarder in the prior art is difficult to adapt to the requirements under different working conditions is solved.

Technologies for variable retarder control include a control valve for controlling operation of a hydraulic retarder. The control valve includes a valve body having a retarder valve including multiple ports and a valve bore extending through the ports. A valve spool is located in the valve bore and movable to selectively block or connect one or more of the ports. The ports include a retarder-out port and an exhaust port, which are fluidly coupled to each other via an exhaust passageway. In use, the exhaust passageway bleeds lubrication fluid from the retarder-out port to the exhaust port as the valve spool is moved from a fully-off position to a fully-on position. The exhaust passageway is shaped so as to provide a linear relationship between the positioning of the valve spool between the fully-off and fully-on positions and the power of the hydraulic retarder. The control valve may also include a lubrication regulator valve configured to supply lubrication oil to the system while the hydraulic retarder is being bled to the exhaust port via the exhaust passageway to maintain appropriate lubrication pressures in the system.

The invention relates to a hydrodynamic retarder, comprising a retarder chamber in which a rotatably mounted rotor and a stator are arranged, which together form a working chamber that can be filled with a working medium and can be emptied from the working medium. The retarder further comprises a working medium tank, which has a region for receiving the working medium that is not present in the working chamber and an expansion region, at least one filling channel for feeding the working medium into the working chamber and a return channel for discharging the working medium from the working chamber, and a rotor housing, a stator housing, and a tank housing. According to the invention, it is proposed that the working medium tank comprises a storage region and a trough region, and that a coupling plane is arranged on the tank housing below the trough region, through which coupling plane at least one second channel is guided, which is suitable for being directly or indirectly coupled to an outlet on the primary side of the heat exchanger.

A control device and a method for controlling traveling speed of a vehicle for the purpose of maintaining a vehicle speed equal to or lower than a pre-set downhill speed. The method comprises simulating a vehicle speed profile for an upcoming road section if braking at a pre-identified power level would currently be requested, thereby obtaining a predicted maximum vehicle speed and a predicted time until a vehicle speed equal to or within a pre-selected interval of the pre-set downhill speed is reached. The method further comprises, if the predicted maximum vehicle speed is equal to or below the pre-set downhill speed and the predicted time is below a preselected threshold time limit, requesting braking at the pre-identified power level or at an adjusted power level.

The invention relates to a method for operating a drive device (1) for a motor vehicle, which drive device has an electric traction machine (2) which is at least temporarily cooled by means of a coolant and has a rotor (3) and a stator (4) which is spaced apart from the rotor (3) by an air gap (6). According to the invention, if there is a brake request for providing a predefined braking torque by way of hydrodynamic braking, a specific amount of the coolant to be added is introduced into the air gap (6). The invention also relates to a drive device (1) for a motor vehicle and to a computer program product.

The invention relates to methods for limiting the braking power of a motor vehicle braking system with a hydrodynamic retarder having a working chamber arranged between two paddle wheels, which can be filled with a working medium or is filled to transfer drive power hydrodynamically from one paddle wheel to the other, thereby braking one paddle wheel and a drive shaft connected to one paddle wheel; with an external working fluid circuit connected to the working chamber via a working fluid inlet and a working fluid outlet, comprising an oil-water heat exchanger with which heat is transferred from the working fluid, which comprises oil, to a vehicle cooling circuit; wherein the braking power of the hydrodynamic retarder is reduced depending on a detected current temperature in the vehicle braking system. The method according to the invention is characterized in that the current temperature of the working medium is detected and, if the detected temperature of the working medium exceeds a predetermined constant working medium temperature limit, the current braking power of the retarder is reduced in such a way that the working medium temperature adjusts to the predetermined working medium temperature limit.

The invention discloses a vehicle control method, the method is applied to a pure electric vehicle, a heat dissipation module is arranged in the pure electric vehicle, the heat dissipation module comprises a radiator, a water pump, a liquid buffer and cooling liquid, and the cooling liquid flows out of the radiator, flows through the water pump and the liquid buffer and then flows back to the radiator. Determining a braking demand of the vehicle in a preset time period; based on the braking requirement, whether the hydraulic buffer working condition is met or not is judged; when the hydraulic buffer working condition is met, working parameters of a heat dissipation module are determined based on the braking requirement; and controlling the heat dissipation module to dissipate heat based on the working parameters of the heat dissipation module. The hydraulic buffer is additionally arranged in the pure electric vehicle, emergency speed reduction can be conducted through the hydraulic buffer when the braking requirement of the vehicle is high, and driving safety is guaranteed.

The invention relates to a method for controlling a hydrodynamic machine comprising a bladed primary wheel and a bladed secondary wheel, which together form a working chamber that can be filled with working medium from a working medium reservoir in a working medium reservoir, in order to transfer drive power hydrodynamically from the primary wheel to the secondary wheel by forming a working medium circuit in the working chamber; wherein a control pressure is applied to the working medium reservoir for a predetermined period of time and thereby a pressure increase is generated in the working medium reservoir in order to displace the working medium from the working medium reservoir into the working chamber. The method according to the invention is characterized in that, after the specified time period, the application of the control pressure is terminated, a pressure drop in the working medium reservoir is at least indirectly detected, and, depending on the detected pressure drop, a fill level of the working medium reservoir in the working medium reservoir and / or a degree of filling of the working space with working medium is determined.

The invention provides an electrohydraulically-controlled hydraulic retarder, which relates to the field of retarders and specifically comprises a front shell, a rear shell, a partition plate, a variable pump, a stator, a rotor, a heat exchanger and a controller, the front shell and the rear shell are connected in a sealed mode through bolts, and a partition plate is arranged between the front shell and the rear shell. The variable pump is installed in an inner cavity in the rear side of the front shell. A working cavity is formed in the middle of the front side of the front shell, the front side of the working cavity is connected with a stator through a bolt, a rotor is arranged in the working cavity and inserted into a driving shaft through a spline, the rear side end of the driving shaft is in threaded connection with the threaded end of a connecting shaft, and the front side end of the driving shaft outwards penetrates out of the stator to be clamped with a driving gear; the heat exchanger is installed on the rear shell through bolts. The controller is installed at the top side end of the front shell and the top side end of the rear shell, potential faults caused by the inlet and exhaust gas oil-gas separation problem and the compressed gas source cleanliness problem can be avoided, and the beneficial effects of being flexible in matching and high in interchangeability are achieved.

The invention relates to a sealing system for isolating two pressure regions, comprising a sealing device arranged between a shaft and a component. According to the invention, the sealing device is arranged in a groove in an axially displaceable manner, the sealing device having a sealing surface and the groove having a groove sealing surface, the sealing device being displaceable into a first functional position or a second functional position depending on a pressure relationship in a pressure region.

Hydrodynamic braking device (2) for a vehicle, the braking device (2) comprising a housing (7), a rotatable brake shaft (8), a brake converter (10) with a fixed stator (11) and a rotatable rotor (12), and a coupling device (13) with a coupling part (14) that can be displaced between a release position and a connection position, wherein the brake converter (10) can be activated by introducing a working fluid and deactivated by draining the working fluid, and the braking device (2) has a flow channel (22) for introducing working fluid into the brake converter (10). The coupling device (13) is effective between the brake shaft (8) and the rotor (12), and the coupling part (14) is designed and / or arranged as a valve piston for closing and releasing the flow channel (22).

A braking system with a hydrodynamic retarder is proposed, coupled to the drive shaft of a system via a drive mechanism. The retarder comprises at least one rotor and one stator, both fixed to rotation on a shaft and arranged in a common housing, forming a torus-shaped working chamber, the shaft being driveable via a drive mechanism. According to the invention, it is proposed that the retarder comprises two sealing systems for separating two pressure areas, wherein a first shaft section of the shaft is arranged in the first pressure area and a second shaft section is arranged in the second pressure area, and a middle shaft section located between the shaft sections is not assigned to either of the pressure areas.

The invention relates to a device for energy recovery for an electrically driven motor vehicle. The device comprises an electric drive unit (16) for driving the motor vehicle and a permanent brake device (20) which is designed as a hydrodynamic retarder and is or can be drivingly connected to the electric drive unit (16). A waste heat recovery device (12) has an expansion machine (36) which is or can be connected to the permanent brake device (20) for energy recovery of a waste heat resulting from the braking of the permanent brake device (20). The invention also relates to a method for energy recovery in an electrically driven motor vehicle.