8 results about "Engine braking" patented technology

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.

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.

A method and system of controlling engine braking in a vehicle, include determining that an accelerator input is not being activated, determining at least one vehicle condition, determining at least one path of travel condition of a road on which the vehicle is traveling, and applying an engine brake as a function of the at least one vehicle condition and the at least one path of travel condition.

Method for controlling a hybrid vehicle powertrain (2), wherein the method is carried out by a control device (100) and the hybrid vehicle powertrain (2) comprises: an internal combustion engine (3), an electric motor (4) which is supplied with electricity via an energy storage device (5), wherein the electric motor (4) is operable to perform regenerative braking of the hybrid vehicle powertrain (2) to charge the energy storage device (5); the procedure exhibits: If it is predicted that at a first time (t1) the state of charge of the energy storage device (5) is above a first state of charge threshold value at which a desired regenerative braking power of the hybrid vehicle powertrain (2) can be supplied for a braking process, the combustion engine (3) is started (S110) in order to enable active engine braking over at least part of the braking process, where the first time point (t1) corresponds to a time point in time of initiation of the braking process, wherein the procedure further includes a step in which a third time (t3) is determined at which the active engine braking is to be initiated, and in which (S120) the active engine braking is initiated at the said third time (t3), where the third time point (t3) corresponds to a time point at which the state of charge of the energy storage device (5) reaches a predetermined second state of charge threshold according to an estimate.

Systems and methods directed to active control of an engine braking operation. One aspect is directed to an engine braking control system for a vehicle. The system includes an electronic processor configured to receive a deceleration request, determine a base engine braking level based on a vehicle speed and a vehicle gear, and adjust the base engine braking level according to a brake pressure of the vehicle. The electronic processor is further configured to generate, based on the adjusted base engine braking level and the deceleration request, a target deceleration profile, determine, based on the target deceleration profile, an engine torque demand, and control an engine braking operation of the vehicle by adjusting a torque of an engine of the vehicle according to the engine torque demand, wherein the engine torque demand is updated during the engine braking operation.

A method for utilizing engine braking to decelerate a vehicle including initiating a preheat in an electrically heated catalyst (EHC). Subsequent to initiating the preheat, the method allows an internal combustion engine (ICE) to spin by one of: engaging a clutch, converting rotation of the ICE to electrical energy, and storing the electrical energy in a rechargeable energy storage system (RESS), and spinning the ICE using electric energy from the RESS, generating regenerative braking energy, and storing the regenerative braking energy in the RESS.

This invention discloses a method, device, medium, and product for fuel-saving cruise control of vehicles. The method includes: acquiring target road information at a preset distance ahead of the vehicle and current vehicle status information; performing global dynamic programming based on a preset optimization objective function according to the target road information and current vehicle status information to generate a global fuel-saving reference speed sequence; using the global fuel-saving reference speed sequence as a benchmark, performing local dynamic programming to generate a local fuel-saving reference speed sequence for real-time tracking; solving and outputting coordinated control commands for the vehicle's engine, braking system, and transmission based on the local fuel-saving reference speed sequence; and sending the coordinated control commands to the corresponding vehicle chassis actuators to control the vehicle to drive according to the local fuel-saving reference speed sequence, thereby realizing the fuel-saving cruise control process of the vehicle. The technical solution of this invention can improve the fuel-saving cruise control effect of vehicles driving at high speeds.

Control device for a vehicle (10; 100) with an internal combustion engine (12), with an automatic transmission (40; 106) which forms part of an energy transmission path between the internal combustion engine (12) and a drive wheel (14), and with a rotary device (MG2) which is coupled to the drive wheel (14) to transmit drive energy, wherein the control device has an electronic control unit (90) which is configured to: a driver assistance control system for driving the vehicle (10, 100) at least by automatically controlling a vehicle speed independently of any driving action by a driver; to perform regenerative braking using the rotary device (MG2) at a time of deceleration while driving with the driver assistance control and to limit downshifting of the automatic transmission (40, 106) when a requested deceleration amount (Grdem) for the vehicle (10, 100) is equal to or less than a predetermined deceleration amount (Grf); and to perform regenerative braking using the rotary device (MG2) at the time of deceleration while driving with the driver assistance control and not to restrict downshifting if the required deceleration amount (Grdem) is higher than the predetermined deceleration amount (Grf), wherein the electronic control unit (90) is configured to perform a shift depending on whether downshifting is to be limited on the basis of the requested deceleration amount (Grdem), if a second requested deceleration amount for the vehicle (10, 100) associated with an operation by the driver is not included in the requested deceleration amount (Grdem) during driving with the driver assistance control, the required deceleration amount (Grdem) is a deceleration amount (Gr) achievable by regenerative braking and by engine braking using the friction of the internal combustion engine (12); and the electronic control unit (90) is configured to set the requested deceleration amount (Grdem) equal to or lower than the predetermined deceleration amount (Grf) when the deceleration amount (Gr) is increased by a wheel brake in a state where the requested deceleration amount (Grdem) is higher than the predetermined deceleration amount (Grf) at the time of deceleration during driving with the driver assistance control.