20 results about "Downshifting" patented technology

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.

The invention relates to a method for operating an automatic transmission of a motor vehicle, in which the automatic transmission has at least one multi-plate shift element, wherein, when it is determined that a temperature (14) associated with the multi-plate shift element exceeds a first upper temperature threshold (T1), downshifts of the automatic transmission requested by means of the multi-plate shift element are prevented for a subsequent period of time and downshifts of the automatic transmission requested by means of the multi-plate shift element are carried out, and then, when it is determined that the temperature (14) associated with the multi-plate shift element exceeds a second upper temperature threshold (T2) higher than the first upper temperature threshold (T1), only such downshifts and downshifts of the automatic transmission to be carried out by means of the multi-plate shift element are executed.which are performed in a speed range close to idle speed, and all other downshifts and downshifts of the automatic transmission that are to be carried out by means of the multi-plate shift element are prevented.

The invention relates to the technical field of intelligent vehicle control, in particular to a steering wheel heating method and device, a vehicle and a storage medium. The method comprises the steps that heating of a steering wheel is started based on a starting instruction, and heating output is conducted on the steering wheel based on an initial heating gear; and in the heating process, the first actual temperature of the steering wheel is obtained, the first actual temperature is compared with a first target closing temperature threshold value corresponding to the initial heating gear, and if the first actual temperature is larger than the first target closing temperature threshold value, the initial heating gear is adjusted based on a preset downshift strategy, and / or the initial heating gear is adjusted based on the preset downshift strategy. And stopping heating the steering wheel. Therefore, the problems of low adjustability, low intelligent degree, high cost and the like of a steering wheel heating strategy in the related technology are solved, the self-adaptive downshift strategy based on the temperature rise time is introduced, intelligent control over heating of the steering wheel is achieved under the condition that hardware does not need to be changed, and the heating efficiency of the steering wheel is improved. The comfort level of a user is improved, and the energy utilization efficiency is remarkably improved.

The present application relates to the technical field of vehicles, and specifically discloses a shift method and device for protecting vanadium-based SCR, a vehicle and a storage medium, wherein the shift method for protecting vanadium-based SCR, after determining that a temperature protection condition judgment enabling condition is met, obtains an actual temperature upstream of the SCR, a target temperature of an SCR temperature control model, a change rate of the target temperature, and road condition information in a set region in front of the vehicle; then, whether the temperature protection condition is met is evaluated based on the actual temperature upstream of the SCR, the target temperature, the change rate of the target temperature and the road condition information, and when the temperature protection condition is met, the gear of the vehicle is downshifted, and the SCR temperature is increased through downshifting, thereby preventing the leakage of vanadium-containing compounds. When judging whether the temperature protection condition is met, the shift method for protecting vanadium-based SCR simultaneously refers to the actual temperature upstream of the SCR, the target temperature and the change rate of the target temperature, can objectively reflect the current state of the SCR, and ensures the accuracy of the control result.

A method for controlling an automatic transmission of a vehicle. The method includes operating the transmission in an automatic mode whereby gear shifting of the transmission is performed automatically based on a speed of the vehicle; receiving a shifting request from a user-operated gear shifter to either: (i) upshift the transmission from a current gear to a higher gear; or (ii) downshift the transmission from the current gear to a lower gear. In response to the shifting request, the method continues with operating the transmission in a semi-automatic mode whereby gear shifting is based on user-generated shifting requests; performing the upshift or the downshift according to the shifting request; monitoring a speed of an engine of the vehicle; and in response to the speed being at a lower speed limit or an upper speed limit, returning operation of the transmission to the automatic mode.

The application provides a vehicle brake energy recovery control method, device and vehicle. When the vehicle is in a brake energy recovery state, the method responds to a received gear reduction request of a transmission, and then controls a power system to perform brake energy recovery according to a brake energy recovery request value sent by a chassis system. Further, current gear information of the transmission in the gear reduction process is obtained, wheel end torque is determined based on the current gear information and a current input shaft torque, and then a brake energy recovery execution value is determined according to the wheel end torque, which is sent to the chassis system to make the chassis system feedback an execution result. The execution value is determined based on actual gear shifting process information of the transmission, the accuracy of the execution value fed back to the chassis system is ensured, the problem that the brake energy recovery function is reported as an error and disabled in the prior art is solved, and normal operation of the function is ensured.

The invention relates to the technical field of new energy vehicle control, and particularly discloses a novel gear locking control method for an automatic transmission new energy vehicle, which comprises the following steps of: establishing a gear locking identification and execution system which comprises a transmission control unit (TCU), an electronic gear shifter, a vehicle control unit (VCU) and a motor control unit (MCU); an automatic gear lever climbing function key of the electronic gear shifter is redefined as a gear locking key; when the vehicle is in the D-gear driving state and the gear locking key is triggered, a gear locking instruction is sent to a vehicle control unit VCU; the VCU is set to respond to the gear locking instruction, stop the automatic gear shifting logic and lock the current gear of the gearbox; the existing hardware state of the vehicle is utilized, the gear locking function can be achieved by updating the VCU program, and the implementation cost is low; and a safety protection mechanism (forced upshift and forced downshift) is arranged, so that the safety is high, the operation is convenient, and the operability is high.

A driving support ECU for executing constant speed control for controlling a vehicle speed so as to become a set vehicle speed, when the vehicle speed exceeds the set vehicle speed, calculates a target deceleration force for setting the vehicle speed, and controls a deceleration force so that a sum of a power train deceleration force and a service brake deceleration force becomes a target deceleration force. The vehicle driving support device is configured to control a deceleration force so as to be a target deceleration force. The driving support ECU determines an allowance degree of a driver with respect to an increase in an engine rotational speed due to a downshift when a vehicle travels downhill, and controls a ratio according to an allowance degree so that a ratio of a power train deceleration force to a target deceleration force becomes higher as an allowance degree is higher.

A method for operating the drivetrain of a motor vehicle, wherein the drivetrain comprises an internal combustion engine (1), an electric machine (4), and a range gearbox (2) with a main gearbox (9) and a range group (11), wherein the internal combustion engine (1) is coupled to an input shaft (6) of the range gearbox (2) via a switchable disconnect clutch (5), and wherein the electric machine (4) is also coupled to the input shaft (6). When the motor vehicle is in motion with the disconnect clutch (5) engaged, and a downshift is to be performed, at least involving the range group (1) and the main gearbox (9), and the electric machine (4) cannot be used for shift element synchronization, the following is carried out: The motor vehicle is decelerated such that the speed of the internal combustion engine (1) is reduced to a target speed.Subsequently, a load reduction is performed on a shift element of the main transmission (9) designed to execute the downshift, and the shift element is engaged. Following this, the input shaft (6) is synchronized to a first target speed, and the shift element of the main transmission (9) to execute the downshift is engaged. Simultaneously or subsequently, the range group (11) is shifted into neutral, the input shaft (6) is synchronized to a second target speed, and a shift element of the range group (11) to execute the downshift is engaged.

This utility model discloses a temperature protection control circuit for a discharge cable in an electric forklift. The positive terminal of the battery is connected to the VCC port of the temperature controller, the key port of the vehicle controller, and the VCC port of the vehicle controller via a key switch. The signal input terminal of the temperature controller is connected to the signal output terminal of the temperature sensing unit. A coil of a first relay is connected to a first signal output port of the temperature controller. The two ends of the switch of the first relay are connected to the key port and the brake port PE0 of the vehicle controller, respectively. A coil of a second relay is connected to a second signal output port of the temperature controller. The two ends of the switch of the second relay are connected to the key port and the speed limiting port PE1 of the vehicle controller, respectively. The signal output terminal of the vehicle controller is connected to the signal input terminal of the motor. This utility model protects the discharge cable from overheating by downshifting and speed limiting of the vehicle and by stopping the vehicle, ultimately extending the service life of the discharge circuit.

The invention discloses a downshift control method, system and equipment for an AMT transmission, and belongs to the technical field of automatic transmission control. According to the method, AMT braking and sliding working conditions are divided into four control stages by detecting the vehicle speed, the rotating speed of an engine and the state of a brake pedal, and when the vehicle speed is higher than a first preset vehicle speed, downshift is executed according to a vehicle speed threshold sequence; when the vehicle speed is lower than the first preset vehicle speed and higher than the second preset vehicle speed, whether downshift is conducted or not is determined according to the engine rotating speed and the brake pedal state; when the vehicle speed is lower than the second preset vehicle speed and higher than the third preset vehicle speed, the clutch is kept disengaged, and downshift is not executed; and when the vehicle speed is lower than the third preset vehicle speed, shifting to the starting gear and keeping the clutch disengaged. Through a staged control strategy, gear shifting rising and part abrasion under the low-speed braking working condition are effectively avoided, and gear shifting smoothness and system reliability are improved.

Control device (3) for a vehicle drive device (1), in which a rotating electric machine (12) and a speed-changing mechanism (13) are provided in that order from the side of an internal combustion engine (11) on a power transmission path connecting the internal combustion engine (11) and wheels (15), and in which the speed-changing mechanism (13) is able to change a speed ratio by controlling an engagement state of a switching engagement device (CL1, CL2) included in the speed-changing mechanism, comprising: a switching support control section (41) which, during a downshift where the speed ratio is changed to a higher speed ratio, performs a switching support control to increase the speed of an input-side rotating component (I) of the speed change mechanism (13) by increasing a torque of the rotating electric machine (12) which is transmitted to the input-side rotating component (I); a capability determination section (42) that determines whether the rotating electric machine (12) can output a required input torque (Tn) to increase the speed of the input-side rotating component (I) according to a predetermined target speed change rate (At) or not; a mode selection section (32) which selects a switching mode from a first switching mode and a second switching mode which differs from the first switching mode with respect to at least one condition for initiating downshifting or processing; and a torque compensation section (43) which, when it is determined that the rotating electric machine (12) cannot output the required input torque (Tn), compensates for a shortfall in the required input torque in the shift support control by using at least one output torque of the internal combustion engine (11) or a torque transmitted by the shift engagement device (CL1, CL2) according to the shift mode, in which the first shift mode is an automatic shift mode and the second shift mode is a manual shift mode, or the second shift mode is a mode in which the time required to control downshifting is shorter than in the first shift mode, or a mode in which the acceleration response during downshifting is higher than in the first shift mode. The torque compensation section (43) compensates for the shortfall by using the torque transmitted by the switching engagement device (CL1, CL2) when the first switching mode is selected, and compensates for the shortfall by using at least the output torque of the internal combustion engine (11) when the second switching mode is selected. The capability determination section (42) further determines whether the rotating electric machine (12) and the internal combustion engine (11) together can output the required input torque (Tn) or not, and The torque compensation section (43) further compensates the shortfall by using the torque transmitted by the switching engagement device (CL1, CL2) if it is determined that the required torque cannot be supplied by the combined action of the rotating electric machine (12) and the internal combustion engine (11) when the second switching mode is selected.

The present invention relates to a method for controlling the drivetrain of a working machine (10), wherein the drivetrain comprises a power-split transmission (26) and a range transmission (32), and wherein a gear is skipped during downshifting in certain driving conditions. For this purpose, a driving condition in which downshifting is required is detected (40). Furthermore, a drivetrain load is predicted (42) during downshifting. A gear is skipped during downshifting if the predicted drivetrain load is greater than the maximum load of the drivetrain. The invention also relates to a control device and a working machine (10).

A method for operating a drivetrain of a motor vehicle comprising an internal combustion engine (1), an electric machine (4), and a range gearbox (2) with a main gearbox (9) and a range group (11), wherein the internal combustion engine (1) is coupled to an input shaft (6) of the range gearbox (2) via a switchable disconnect clutch (5), and wherein the electric machine (4) is also coupled to the input shaft. When the motor vehicle is traveling with the disconnect clutch engaged, and a downshift is to be performed involving the range group (11) and the main gearbox (9), and the electric machine (4) cannot be used for shift element synchronization, the following is carried out: The motor vehicle is accelerated such that the speed of the internal combustion engine (1) is brought up to a target speed.Subsequently, a load reduction is performed on a shift element of the main transmission (9) designed to execute the downshift, and the shift element is engaged. Following this, the input shaft (6) is synchronized to a first target speed, and the shift element of the main transmission (9) to execute the downshift is engaged. Simultaneously or subsequently, the range group (11) is shifted into neutral, the input shaft (6) is synchronized to a second target speed via the internal combustion engine (1), and a shift element of the range group (11) to execute the downshift is engaged.

This application provides a vehicle hill-start assist control method, device, controller, and storage medium. The vehicle is currently in neutral coasting mode. The method includes: detecting the vehicle's throttle opening; if the throttle opening is greater than a preset threshold, detecting the vehicle's current speed as a first current speed and calculating the highest gear matched to the first current speed; detecting the slope of the hill where the vehicle is located; if the slope is greater than a preset slope threshold, calculating the vehicle's acceleration; if the vehicle acceleration is greater than a preset acceleration threshold, determining the highest gear as the vehicle's target gear and controlling the vehicle to enter the target gear, thus ending the neutral coasting phase; if the acceleration is less than or equal to a preset acceleration threshold, downshifting one gear from the highest gear as the vehicle's target gear and controlling the vehicle to enter the target gear, thus ending the neutral coasting phase. This application enables the vehicle to maintain stable gear shifting on hills, improving vehicle power and driving safety.

This application provides a vehicle control method, control device, vehicle, and storage medium. The method, applied in the field of vehicle control technology, includes: during vehicle hill climbing, determining whether downshifting of the transmission is necessary based on gradient information and vehicle status information; when downshifting is required, determining a target gear; downshifting the transmission to the target gear; and switching the vehicle's power mode to a power-split mode, where the wheel-end torque output efficiency is highest. This method incorporates the gradient of the road as a determining factor for downshifting during hill climbing, enabling timely downshifting control when gradient changes are significant, improving climbing power, preventing power interruption during hill climbing, and enhancing the user's hill climbing experience.

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.

The present invention relates to a mechanism which allows the selective and temporary increase of the functional length of the bicycle lever arm (L - L+DL) exclusively during the cyclist's push phase. In this way, the torque transferred to the transmission system is increased without the use of a larger front gear, achieving greater angular displacement and increased rotational speed of the rearwheel in conditions where downshifting would be required. The spring preload is adjustable to adapt to different force levels and cyclist styles. The mechanism can be factory-integrated into new bicycles (OEM) or made available as an independent aftermarket component. The invention is a simple, low-cost and highly-reliable construction.

This application discloses a shift control method, device, medium, and electronic equipment applied to vehicles with two-speed reduction gearboxes. The method includes: determining whether the vehicle speed is less than or equal to the downshift speed; if the vehicle speed is less than or equal to the downshift speed, determining whether the vehicle is in the second gear; if the vehicle is in the second gear, downshifting is permitted; if the vehicle is not in the second gear, downshifting is not permitted. This application can solve the problem of battery over-discharge caused by rapid acceleration and downshifting when the SOC is low.

The utility model discloses a downshift energy-saving electric defroster associated with vehicle speed. The electric defroster is connected with a defroster control system; the defroster control system comprises a defroster electric control box connected with the electric defroster, a high-voltage output control circuit and a low-voltage output control circuit, and the defroster electric control box is connected with the whole vehicle controller through a whole vehicle CAN network; the electric defroster comprises a power-adjustable electric heater, a fan is arranged on one side of the power-adjustable electric heater, an air outlet pipe is arranged on the other side of the power-adjustable electric heater, the power-adjustable electric heater converts high-voltage electric energy into heat energy, and the heat energy is conveyed into the automobile through the fan. And the power-adjustable electric heater is connected with the electric heating high-voltage interface and is connected with high-voltage electricity of the whole vehicle through the electric heating high-voltage interface. The utility model provides a downshift energy-saving electric defroster which is adjustable and is associated with vehicle speed and parking time. The liquid crystal touch screen is integrated into the control system of the defroster, so that the attractiveness of an operation table and the operation convenience of a driver are greatly improved, and the user experience is improved.