44results about "Hydrodynamic brakes" patented technology

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.

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 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.

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.

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 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 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.

A hydrodynamic retarder includes: a retarder chamber in which a rotor and a stator are arranged, the rotor and the stator together forming a working chamber for being filled with and emptied of a working medium; a working medium tank, which includes sump, storage, and expansion regions, the sump region and the storage region for accommodating the working medium that is not currently in working chamber; a filling channel for supplying the working medium into the working chamber, the filling channel being a tube including an inlet opening and an outlet opening; a return channel for discharging the working medium from the working chamber; a rotor housing; a stator housing; a tank housing; and an inlet chamber, the inlet opening terminating in the working medium tank, the outlet opening terminating in the inlet chamber, the inlet chamber being formed by the stator housing and the stator.

The invention discloses a hydraulic retarder oil charging and discharging control method and system, a storage medium and a software product. According to the scheme, four switch type electromagnetic valves are used for controlling oil charging and discharging work of the retarder, pressure closed-loop control, gas consumption pre-calculation control and direct exhaust control are set in the control method, and in the process, according to a target oil charging amount instruction and information such as the current air pressure value in an oil tank obtained by a sensor, the oil charging amount is calculated. And determining to execute a pressure closed-loop control method or a gas consumption pre-calculation control method. According to the invention, the response speed of oil charging and discharging control can be improved, and the control precision of vehicle braking is further improved.

The invention relates to a hydrodynamic retarder comprising a rotor and a stator which are arranged in a two-part housing, namely a rotor housing part and a stator housing part, said rotor and stator forming a toroidal working chamber which can be filled with a working medium via an inlet channel and / or a pump, the invention relates to a retarder for a motor vehicle, in particular a motor vehicle, having a rotor housing part and a working chamber, which can be evacuated via an outlet channel and / or a return channel, which connects a skimming bore in the rotor housing part to a reservoir in such a way that the working medium can be discharged from the working chamber, the rotor being movably positioned on the retarder shaft and being movable from a non-braking operating position into a braking operating position. According to the invention, means are provided by means of which a volumetric flow can be discharged from the toroidal working chamber, a part of the volumetric flow entering the annular gap via a running gap between the rotor and the rotor housing part, and a part of the volumetric flow returning into the working chamber via the annular gap.

The invention relates to a vehicle comprising two front wheels (12, 13) and two rigid deflectors (1, 2) positioned in front of the two front wheels (12, 13), each being rotatably mounted between an active position in which it protrudes under the vehicle in front of a front wheel (12, 13) extending in a vertical and transverse plane YZ of the vehicle, and an inactive position in which it is stored within the vehicle. The vehicle includes a braking system (10) comprising a brake booster (18) and a brake pedal (11).According to the invention, the vehicle includes an actuation mechanism for the two deflectors (1, 2) based on an actuation circuit (51) originating from the brake booster (18) and terminating in an actuator (52) which is connected to the two deflectors (1, 2). Pressing the brake pedal (11) simultaneously induces a braking phase of the vehicle and activates the actuator (52), causing the two deflectors (1, 2) to pivot until they reach the inactive position. Figure 4 for the abbreviated version.

The invention relates to a 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 and emptied of working medium. The retarder also comprises: a working medium tank which has a region for holding working medium that is not currently in the working chamber, and an expansion region; at least one filling channel for supplying working medium to the working chamber; and a return channel for discharging working medium from the working chamber, as well as a rotor housing, a stator housing, and a tank housing. According to the invention, the filling channel is a tube having an inlet opening and an outlet opening, the inlet opening ending in the working medium tank and the outlet opening ending in an inlet chamber, the inlet chamber being formed by the stator housing and the stator.

The invention relates to a method for controlling a hydrodynamic machine, which has a bladed primary wheel (1) and a bladed secondary wheel (2), which together form a working chamber (3) that can be filled with working medium from a working medium supply in a working medium supply container (5) in order to transfer drive power hydrodynamically from the primary wheel to the secondary wheel by the forming of a work medium circuit in the working chamber; wherein a control pressure is applied to the working medium supply for a specified period of time and a pressure increase in the working medium supply container is thereby generated in order to force the working medium out of the working medium supply into the working chamber. The method according to the invention is characterized in that the application of the control pressure is ended after the specified period of time has elapsed, a pressure drop in the working medium supply container (5) is at least indirectly detected, and a fill level of the working medium supply in the working medium supply container and / or a degree of filling of the working chamber with working medium is determined according to the detected pressure drop.

A pneumatic control system and an execution method therefor. The system comprises at least one charge valve, a switching valve and an exhaust valve. The charge valve is a two-position two-way solenoid valve, with an inlet port in communication with an air source device. The switching valve is a two-position three-way solenoid valve and comprises: an inlet port P in communication with an outlet port of the charge valve; an outlet port A in communication with an oil tank; and an exhaust port T in communication with the external environment. The switching valve is switchable between a PA position in which the inlet port P is in communication with the outlet port A, and an AT position in which the exhaust port T is in communication with the outlet port A. The exhaust valve is a two-position two-way solenoid valve, with an inlet port in communication with the oil tank and an outlet port in communication with the external environment. The pneumatic control system has a simple structure and is able to ensure a pneumatic flow rate, thereby achieving rapid pressurization / depressurization. The system does not require proportional control by means of a solenoid valve position sensor, thereby saving on costs and improving the durability of the system.

The invention relates to a brake system (100) for braking a rotation shaft (1), characterised in that it comprises: - at least one piston (4), actuated by means of an electric linear actuator (3), able to move between a retracted release position and a final extended braking position; - a casing (6) adapted to rotate integrally with the rotation shaft, with a cavity closed by a perpendicular cover (5), provided with at least one opening in which the piston (4) is fitted, and the piston (4) having the ability to move forwards into the closed cavity and move backwards, and - a filling occupying the closed cavity, rotating with the casing, consisting of a dispersion (7) or amalgam formed by a powdery or granular product with a lubricating agent.

A retarder with an air outlet system is proposed, through which exhaust air from an oil tank can be directed into the environment. An exhaust air duct is integrated into a retarder housing, comprising an inlet opening and an outlet opening, with the air outlet system arranged between the outlet opening and the environment. According to the invention, the air outlet system comprises a separator element having two sections: an outer section extending outside and an inner section extending inside the exhaust air duct.

A method for controlling a motor vehicle (1), comprising: - retrieving road gradient data relating to an expected travelling route of the motor vehicle, - based on at least the retrieved road gradient data and on a motor vehicle mass, simulating a required value of a braking power related variable, which required value is needed to prevent a vehicle speed (v) from increasing above a preset desired vehicle speed in an upcoming downhill slope, - determining an available value of the braking power related variable of at least one auxiliary brake of the motor vehicle, - based on the determined available value and the simulated required value of the braking power related variable, controlling the vehicle speed and / or at least one brake actuator of the motor vehicle such that the vehicle speed does not increase above the preset desired vehicle speed in the upcoming downhill slope.

A hydrodynamic retarder is proposed comprising a rotor and a stator arranged in a two-part housing, a rotor housing part and a stator housing part, wherein the rotor and stator form a torus-shaped working chamber which can be filled with a working medium via an inlet channel and / or a pump and emptied via an outlet channel and / or a return channel, wherein the return channel connects a skimming bore in the rotor housing to a tank so that working medium can be discharged from the working chamber, wherein the rotor is slidably positioned on a retarder shaft and can be moved from a non-braking operating position to a braking operating position.According to the invention, it is proposed that means are provided by which a volume flow can be discharged from the torus-shaped working space, wherein a partial volume flow can be directed through a running gap between rotor and rotor housing part into an annular gap, through which the partial volume flow returns to the working space.

The invention belongs to the technical field of vehicle braking, and relates to a hydraulic retarder control system based on a parallel pneumatic valve and a high-speed switch valve, which is integrated on a valve block and comprises a whole vehicle air source, an air pressure output port, an exhaust port, a pilot control unit, a switching unit, an adjusting unit, a detection unit and a control unit. The pilot electromagnetic valve is adopted to drive the normally-closed air inlet pneumatic valve and the normally-open air outlet pneumatic valve which are arranged in parallel, the air inlet function and the air outlet function are separated, the air inlet switch valve independently adjusted by the control unit is arranged at the rear end of the air inlet pneumatic valve, the air inlet switch valve is finely adjusted through the control unit according to real-time pressure feedback, and the air inlet and outlet function is achieved. A hierarchical control framework of pilot control, power switching and precise fine adjustment is constructed, the precision defect of a traditional proportional electromagnetic valve under the small-flow working condition is avoided, high-resolution and stepless fine adjustment of output pressure is achieved, meanwhile, all valve assemblies are integrated on a valve block, and the volume of a dead zone of an air path is further reduced.

A hydrodynamic retarder includes: a retarder chamber in which a rotor and a stator are arranged, the rotor and the stator together forming a working chamber that is for being filled with and emptied of a working medium; a working medium tank, which includes a sump, storage, and expansion regions, the sump and storage regions for accommodating the working medium that is not currently in the working chamber; a filling channel for supplying the working medium into the working chamber; a return channel for discharging the working medium from the working chamber; a rotor housing; a stator housing; a tank housing, the rotor housing and the tank housing forming the working medium tank, the retarder chamber being a space that is enclosed by the rotor housing and the stator housing; and a first coupling level, which is arranged between the rotor housing and the stator housing within working medium tank.

An oil supply for an automatic transmission or an automated manual transmission in a drive train is proposed, which oil supply comprises an oil sump and a heat exchanger, wherein the oil supply is provided for at least the following operating states of the automatic transmission: • the torque converter mode; • the drive mode in one of the mechanical gears; • the retarder mode. In order to optimize the cooling of the oil volumetric flows in the case of different operating states, it is proposed according to the invention that two heat exchangers (11, 12) are provided, through which an oil volumetric flow can be conducted depending on the operating state of the automatic transmission.

The invention relates to an apparatus (100) comprising a magnetorheological transmission device (1) having two rotary components (2, 3) that are movable relative to one another. Formed between the rotary components (2, 3) is a working gap (4) with a magnetorheological medium (5). An electrical coil unit (6) is used to generate a controllable magnetic field in the working gap (4). A supplementary brake (7) serves to brake the rotatability of the rotary components (2, 3) if the magnetic field of the coil unit (6) breaks down. The supplementary brake (7) comprises a magnetic element (17) which extends in the circumferential direction of the working gap (4) and has at least one magnetic unit (27) including at least one permanent magnet (37) that extends only over part of the circumference.

The invention relates to a 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 and emptied of working medium. The retarder also comprises: a working medium tank which has a region for holding working medium that is not currently in the working chamber, and an expansion region; at least one filling channel for supplying working medium to the working chamber; and a return channel for discharging working medium from the working chamber, as well as a rotor housing, a stator housing, and a tank housing. According to the invention: the working medium tank comprises a storage region and a sump region; and a coupling plane is located on the tank housing below the sump region, through which cooling plane at least one second channel runs which is suitable for direct or indirect coupling with the outlet of the primary side of a heat exchanger.

A control valve 110, method, and hydraulic retarder control system for controlling operation of a hydraulic retarder (104; fig.1), including a retarder valve 202 with a retarder-out port 212 configure

The invention relates to a method for operating a power plant (1) of a motor vehicle, comprising a power motor (2) which is cooled at least in short time by means of a coolant and which 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, the coolant is introduced into the air gap (6) in a determined additional coolant amount when a braking request for providing a predetermined braking torque by means of hydraulic braking occurs. The invention also relates to a power plant (1) for a motor vehicle and to a computer program product.

The present document relates to a driveline for a vehicle, the driveline comprising a hydrodynamic retarder, a first driveline component such as a transmission input, and a controller configured to activate the hydrodynamic retarder at a point in time which is determined based on a rotational acceleration of the first driveline component. The present document further relates to a method of controlling a hydrodynamic retarder.