74 results about "Engine braking" patented technology

An engine brake rocker arm assembly (RA) comprising: a rocker arm (11) arranged to swing in response to a cam supported by a camshaft so as to press down at least one exhaust valve; a shaft (20) slidably arranged in one end of the rocker arm, the shaft having a first end and a second end opposite the first end, the first end being provided with an engagement portion (16, 21) facing the exhaust valve, the second end being provided with a stroke stop (24). The castellated members (30, 40, 50) comprise anterior teeth adapted to engage with each other such that the capsule is adapted to assume an extended configuration and a contracted configuration, respectively, according to tooth-to-tooth or tooth-to-valley engagement under the action of an actuator (70) adapted to rotate at least one member of the castellated capsule relative to the other, and a rocker arm (60) arranged to bias the castellated members away from each other so as to force the castellated capsule in said extended state and said contracted state, in which the rocker arm comprises a seat (90) filled with oil to define a damping portion capable of damping the stroke stop (24).

Method (200) for controlling a vehicle powertrain (2) during engine braking, performed by a control device (100), wherein the vehicle powertrain (2) comprises: an internal combustion engine (3), a transmission (4) configured to selectively transmit drive torque from the internal combustion engine to drive wheels (7), and Service brakes (10) configured to brake the drive wheels (7); the procedure includes the following step: Activation (S107) of the service brakes (10) for the purpose of reducing the speed of the internal combustion engine (3) when the speed of the internal combustion engine (3) approaches a threshold value (v th ) to shift up the transmission (4), and wherein the step of activating (S107) the service brakes (10) is carried out based on a determination that the acceleration of a vehicle (1) comprising the vehicle powertrain (2) is below a preselected value.

A synchronizing system in a valvetrain assembly. A first rocker arm comprises a deactivating roller, the deactivating roller configured to be selectively switchable between a latched position and an unlatched position. A second rocker arm comprises an engine brake capsule, the engine brake capsule configured to be selectively translatable between a retracted position and an extended position. A first switching mechanism is arranged in the first rocker arm and configured to move between a first position and a second position to controllably switch the deactivating roller between the latched position and the unlatched position. A second switching mechanism is arranged in the second rocker arm and configured to move between a third position and a fourth position to controllably translate the engine brake capsule between the retracted position and the extended position. A single actuation source is configured to synchronously control (a) movement of the first switching mechanism from the first position to the second position and (b) movement of the second switching mechanism from the third position to the fourth position.

An engine brake controller can obtain a performance characteristic of an engine. The engine brake controller can determine that engine braking is enabled to control the engine based on the performance characteristic of the engine. The engine brake controller can monitor a set of operating parameters of the engine. The engine brake controller can determine that operating values of the set of operating parameters satisfy respective thresholds of the set of operating parameters. The engine brake controller can determine an engine brake configuration associated with initiating engine braking of a set of cylinders of the engine based on the operating values satisfying the respective thresholds. The set of cylinders can be a proper subset of a total number of cylinders of the engine. The engine brake controller can cause engine braking to be applied to the set of cylinders to increase a temperature of exhaust gas from the engine.

To provide an optimized method for engine brake compensation, a method for operating a coolant circuit (100) of a vehicle (200) is proposed, wherein the coolant circuit (100) has at least a first evaporator (10) and a compressor (11), wherein during a braking operation of the vehicle (200) a liquid coolant flow is passed over the first evaporator (10), wherein essentially no phase change of the coolant takes place in the first evaporator (10), so that the liquid coolant flow is directed to the compressor (11) and causes an increase in the power output of the compressor (11) compared to operation with a vaporous coolant, wherein the energy used for the power output increase of the compressor (11) is provided by recuperation during the braking operation of the vehicle (200).

An engine brake system, comprising a housing comprising a first passage extending along a first axis, a second passage extending along a second axis that intersects the first axis, the first passage in communication with the second passage. The engine brake system further comprises a pin arranged in the first passage and configured to translate along the first axis to hold open one or more valves of an internal combustion engine, a wedge arranged in the second passage and configured to translate along the second axis and engage with the pin, and a solenoid coupled to the wedge and configured to actuate the wedge along the second axis.

The invention provides an engine control method, a vehicle control unit and a vehicle, and relates to the technical field of vehicle control. According to the method, an engine is not controlled under the conditions that a hand brake is pulled up and the opening degree of an accelerator is smaller than a first preset opening degree threshold value, and an accelerator pedal signal is responded through an ECU; the purposes of preventing the vehicle from suddenly moving due to mistakenly stepping on the accelerator during parking and avoiding accidents are achieved, meanwhile, when the hand brake is loosened and the brake opening degree is smaller than the preset brake opening degree threshold value, the engine is switched into the rotating speed control mode, the purposes of providing proper engine braking force and avoiding engine flameout are achieved when the vehicle is slightly braked, and the safety of the vehicle is improved. Therefore, the technical problem of engine flameout during starting of the AMT is solved, and the technical effects that vehicle jerking caused by engine flameout is avoided, and smoothness and comfort in the driving process are improved are achieved.

A rocker assembly includes a valve bridge, a guide post, and a spring. The valve bridge is operably associated with the rocker assembly and is configured to engage a first exhaust valve and a second exhaust valve, wherein the valve bridge includes an internal chamber extending into the valve bridge from a bottom side of the valve bridge. The guide post is disposed at least partially within the internal chamber, wherein the guide post is fixed to a valve train carrier and extends upwardly into the valve bridge, wherein the valve bridge is configured to translate along the guide post. The spring is disposed about the guide post, wherein a first end of the spring is disposed on a top surface of the valve train carrier, and wherein a second end of the spring is disposed against the bottom side of the valve bridge.

This invention relates to the field of engine braking technology, and particularly to an engine braking device and its control method, including an oil drain assembly. The oil drain assembly includes an oil drain chamber formed on a piston, with a valve ball at one end of the chamber protruding from the piston surface. An oil drain steel ball is disposed inside the oil drain chamber to seal it. A first oil drain spring is disposed on the side of the steel ball away from the valve ball, and a second oil drain spring is disposed between the steel ball and the valve ball. The oil drain assembly forms an oil drain passage communicating with the oil drain chamber. This invention, by integrating the oil drain assembly within the piston and utilizing the structural design of the valve ball being stressed before the piston, achieves early triggering of the oil drain action. This allows partial release of oil in the high-pressure chamber before the piston is fully stressed, effectively reducing the initial pressure peak, minimizing impact load, and preventing structural damage due to high-pressure accumulation.

A vehicle includes a powertrain with a prime mover, a transmission with a number of gears, and foundation brakes. The speed of the vehicle along a downhill route segment is automatically controlled toward a target speed by prioritizing the use of engine braking power and gear downshifting in the transmission over application of the vehicle's foundation brakes.

A compression-release engine brake system for operating at least one exhaust valve of an engine during an engine braking operation. The brake system comprises a lost motion exhaust rocker assembly and a dual stage hydraulic solenoid valve. The exhaust rocker assembly includes an exhaust rocker arm and a compression brake control module (CBCM). The CBCM maintains the at least one exhaust valve open when in the engine braking operation. The CBCM includes a casing, an actuation piston disposed outside the casing so as to define an actuation piston cavity, a reset check valve, and a compression brake actuator disposed in the casing. The actuation piston reciprocates relative to the casing. The compression brake actuator includes a control piston that engages the check valve when deactivated so as to unlock the actuation piston cavity and disengages from the check valve when activated so as to lock the actuation piston cavity.

Vehicle operating procedures, comprehensive: Operating a continuously variable transmission (CVT) via a control unit to adjust the engine speed according to a first engine speed-to-vehicle speed profile in response to a request for engine braking; and Changing the operation of the CVT via the control to adjust the engine speed according to a second engine speed-to-vehicle speed profile in response to a vehicle speed error and brake pedal position.

The buffering mechanism of the engine braking rocker arm comprises an elastic body, the elastic body is arranged between the rocker arm and a rocker arm shaft, the elastic body abuts against the rocker arm and the rocker arm shaft, and elastic deformation of the elastic body exerts acting force between the rocker arm and the rocker arm shaft. When the rocker arm is driven to move, the motion resistance of the rocker arm on the rocker arm shaft is caused, the motion resistance keeps the rocker arm in two non-collision positions on the rocker arm shaft, and in the two non-collision positions, one end of the rocker arm avoids driving of an engine cam, and the other end of the rocker arm avoids acting with an engine valve. The rocker arm does not move in the ignition period of an engine, mechanism flying-off, friction and oil consumption are eliminated, and the use frequency is greatly reduced.

The application discloses an automatic gear heavy truck multi-mode engine brake control method, equipment and medium, the method comprises the following steps: determining whether the engine enters the gearbox shift mode in the multi-mode engine brake according to the gear signal in the automatic gear heavy truck vehicle information, determining whether the engine brake enters the condition when it is not shifting, if yes, receiving the engine brake instruction to control the engine to enter the corresponding engine brake mode; determining the target brake power percentage of the engine brake in the engine brake mode of the driver and the target speed in the automatic constant speed engine brake mode; determining the brake gear level matched with the brake torque of the target brake power percentage or the target speed of the brake power range and adjusting the brake power; when the rising rate of the vehicle speed or the engine speed exceeds the threshold value in the preset time interval, the engine has the risk of overspeed, the emergency brake mechanism in the emergency full brake mode is started, and the multi-mode engine brake control of the automatic gear heavy truck is realized.

The invention discloses a brake cam profile for increasing the brake power of a diesel engine and a control method, belongs to the technical field of engine brake cams, and solves the technical problem that an existing cam can only brake once in one cycle. The brake cam profile comprises a base circle, the base circle is provided with a BGR lift section profile, a first release lift section profile and a second release lift section profile which are sequentially arranged, a first base circle section is arranged between the BGR lift section profile and the first release lift section profile, and a second base circle section is arranged between the first release lift section profile and the second release lift section profile. The length of the first base circle section is smaller than that of the second base circle section, and the second release lift section molded line and the BGR lift section molded line are connected together. According to the invention, two times of braking in one cycle can be realized in a single braking cycle, and in-cylinder media of a second intake stroke and a compression stroke come from gas backflow released into an exhaust pipe for the first time, so that higher in-cylinder pressure can be generated, and more negative work can be done.

A method to increase efficiency in a hydrogen fuel system requiring high pressure hydrogen injection and having a plurality of hydrogen fuel tanks, the method including controlling one or more hydrogen fuel tanks and at least one hydrogen fuel tank to provide fuel in parallel to the hydrogen fuel consumer. The method includes determining when an intermediate tank pressure threshold has been reached in all hydrogen fuel tanks. The method includes responsive to the intermediate tank pressure threshold being reached in all of the hydrogen fuel tanks, removing the at least one hydrogen fuel tank from providing fuel to the hydrogen fuel consumer while using one or more hydrogen fuel tanks to provide hydrogen fuel to the fuel consumer. The method includes when an engine brake event has been detected, pumping hydrogen from the one or more hydrogen fuel tanks into the at least one hydrogen fuel tank.

The invention discloses a diesel engine aftertreatment system heat management control method, system and device and a storage medium. The method comprises the steps that working condition information, exhaust passage temperature information, carbon load information and engine working condition information of a target vehicle are obtained; determining a thermal management mode of the post-processing system based on the working condition information, the exhaust passage temperature information and the carbon load information; target control parameter information is calculated based on the engine working condition information and the thermal management mode in combination with the MAP; based on the target control parameter information, a cooperative control instruction set is generated, and the cooperative control instruction set is used for controlling an engine braking device, an exhaust braking valve, an air inlet throttling valve and a high-pressure common rail oil injection system to conduct cooperative operation. The technical problems that the post-processing system is high in heat management cost and poor in post-processing control precision and reliability are solved.

A motorcycle rider assistance device comprises a brake start inter-vehicle distance calculation unit (3) that calculates a brake start inter-vehicle distance between the rider's own vehicle and another vehicle at a time when the rider's own vehicle begins to decelerate by means of engine braking, an engine braking acceleration value calculation unit (6) that calculates an acceleration value of the rider's own vehicle, an engine braking acceleration value storage unit (7) that stores an acceleration value of the rider's own moving vehicle, a driving condition estimation unit (9) that estimates a driving condition of the rider's own vehicle, and an engine braking acceleration value correction unit (10) that corrects an acceleration value obtained by means of engine braking;the motorcycle rider assistance device is configured such that when the riding condition estimation unit (9) estimates that the rider's own vehicle is in a predetermined riding condition, braking of the rider's own vehicle is initiated by the engine brake.

The operation of the air conditioning system is controlled according to the vehicle's driving conditions. [Solution] The air conditioning control device 30 has an air conditioning control unit 322 that controls the output of a compressor 21 included in an air conditioner 20 that conditioned the air inside the vehicle S, and the air conditioning control unit 322 makes the output of the compressor 21 when the vehicle S is accelerating less than the output of the compressor 21 when the engine brake is applied to the vehicle S.

The invention relates to an ADAS-based plateau long downhill intelligent combined braking and energy recovery system and method, the system comprises a sensing layer, a decision-making layer, a collaboration layer and an execution layer, and the sensing layer comprises an ADAS sensor group, a high-precision map module, a positioning unit and an environment sensing sensor; the decision-making layer comprises a multi-sensor fusion module, a road potential energy prediction model, a driver intention recognition module, an MPC optimization controller and a plateau adaptive algorithm module; the execution layer comprises a motor braking controller, an engine braking controller and a mechanical braking controller. The system has the beneficial effects that the driver intention recognition module can accurately distinguish the sliding intention from the braking intention, and unnecessary energy recovery intervention is avoided; smooth braking force transition and intelligent mode switching effectively reduce the pause feeling of a traditional combined braking system. Seamless integration with an existing ADAS function is realized, and information sharing and function collaboration are realized through a collaboration layer.

A positioning mechanism of an engine brake rocker arm comprises a positioning bolt and a positioning spring, one end of the positioning bolt is fixedly connected with a rocker arm shaft, one end of the positioning spring abuts against the other end of the positioning bolt, and the other end of the positioning spring movably abuts against the rocker arm. And the positioning spring enables motion resistance to be generated between the rocker arm and the rocker arm shaft. The rocker arm does not move in the non-engine braking operation period, flying-off, friction and oil consumption of the mechanism are eliminated, the use frequency is greatly reduced, and the whole mechanism does not occupy space (especially not heightened) and not weighted, and is compact in structure, convenient to install, low in cost, durable and reliable.

The invention discloses a vehicle exhaust temperature control method and system. The vehicle exhaust temperature control method comprises the steps that an ECU determines the driving working condition according to the fuel gas injection amount and the rotating speed of an engine; under the condition that the driving working condition is the long downhill working condition, the ECU increases the opening degree of an engine throttle valve, decreases the opening degree of an EGR valve and decreases the opening degree of a supercharger deflation valve, and synchronizes the current rotating speed and the current torque of the engine to the VCU; the VCU increases the current rotating speed of the engine to a safe rotating speed threshold value, a long downhill neutral sliding activation condition is started, and the current torque corresponding to the safe rotating speed threshold value is sent to the TCU; and the TCU controls the hydraulic retarder and braking in an engine cylinder based on the ratio of the engine braking torque to the torque of the hydraulic retarder corresponding to the long downhill working condition and the current torque. According to the technical scheme, the exhaust temperature increasing efficiency can be improved.

An internal combustion engine system includes an engine with a plurality of cylinders, a fueling system to provide fuel to the plurality of cylinders, an air intake system to provide air to the plurality of cylinders through respective ones of a plurality of intake valves, and an exhaust system to release exhaust gas from the plurality of cylinders through respective ones of a plurality of exhaust valves. During engine braking, an amount of fuel is injected into one or more cylinders involved in the engine braking during the compression stroke thereof to improve engine braking performance.

An exhaust valve rocker arm assembly selectively opening first and second exhaust valves. The assembly comprises an exhaust rocker arm; a valve bridge operably associated with the exhaust rocker arm and including a main body and a lever rotatably coupled to the main body, the main body configured to engage the first exhaust valve, and the lever configured to engage the second exhaust valve; and an engine brake rocker arm having an engine brake capsule movable between a retracted position where the engine brake capsule is configured to not engage the lever, and an extended position where the engine brake capsule is configured to engage the lever to thereby engage the second exhaust valve.

The utility model relates to the technical field of internal combustion engines, in particular to an engine braking device which comprises a braking mechanism and a rocker arm, the braking mechanism is installed on the rocker arm, and a pressure relief piece is installed in the braking mechanism in a matched mode. The braking mechanism comprises a shell, a fixing plate is installed on the bottom face of the shell, a third spring is installed on the end face of the fixing plate, and a pushing block is installed on the end face of the third spring. The pressure relief piece is installed on the pushing block, the pressure relief piece comprises a moving block, the moving block is installed on the bottom face of the pushing block, a connecting cylinder is installed on the end face of the moving block, the connecting cylinder communicates with the upper portion of the pushing block and the interior of the moving block, and pressure relief grooves are symmetrically formed in the lower portion of the side wall of an inner cavity of the moving block; through mutual cooperation of the structures, the effect that when the internal pressure intensity of the braking mechanism is too high, pressure in the device can be relieved in time is achieved, and the problem that the device is damaged due to the fact that the internal pressure intensity of the device is too high is solved.

The invention relates to an EGR pump locking mechanism and a method for locking an EGR pump rotation set during engine braking. The EGR pump system includes an EGR pump assembly including an electric motor assembly coupled to a transmission assembly. The Roots device is coupled to the electric motor through the transmission assembly. The Roots device includes a housing defining an interior volume, and a rotor is disposed in the interior volume and connected to the transmission assembly. An EGR lock mechanism is attached to the EGR pump assembly. The EGR locking mechanism is selectively connected to the transmission assembly to lock the transmission assembly and prevent rotation of the rotor.

A brake assembly for an internal combustion engine includes a rocker arm having a rocker arm body. The rocker arm body defines a bore for a reset valve movable between an open position and a closed position. The rocker arm body includes a wall portion defining an oil drain structure fluidly connected with the bore and an outer surface of the rocker arm body. The reset valve includes a reset pin having an elongate body defining an annular groove sized to align with the oil drain structure when the reset valve is in an open position. The annular groove is positioned to capture and retain brake fluid that may leak from the actuator oil supply chamber into the bore to prevent the leaked brake fluid from reaching the bias chamber oil supply chamber and activate a brake plunger assembly therein, thereby preventing automatic activation of engine braking conditions.

A rocker arm assembly for a valve train comprises a rocker arm with a cam end, a central rotary bore, and a valve end, the valve end comprising a first bore. The engine brake actuator comprises an engine brake mechanism located in the first bore, the engine brake mechanism comprising a body and a piston located in the body. The piston is configured to move between a retracted position and an extended position. The piston includes a spring located between locking pins, the spring being configured to bias the locking pins in an outward direction. The body defines receptacles for receiving the locking pins.The rocker arm assembly further includes an actuating mechanism which is arranged in a second bore and configured to direct a fluid to the engine brake mechanism to move the piston hydraulically into the extended position and to move the locking pins hydraulically towards each other.