A regenerative braking control device of an electric vehicle, wherein, in an electric vehicle system that includes an electric motor coupled to a drive wheel, the regenerative braking control device has an electric motor controller that controls powering or regeneration of the electric motor, and a regeneration amount setting unit that sets a regeneration amount by a driver operation and that can change the regeneration amount according to an intention of a driver. The electric motor controller includes a regeneration instruction torque limitation unit that limits, immediately before stop of the vehicle with a motor rotation speed in a low-speed area, the regeneration amount to be decreased as a motor rotation speed is lowered.

The present invention relates to a method for recuperation based braking of a vehicle in which electrical energy generated during a braking process is decreased by operating at least one second electric machine of the vehicle in a zero slip mode in order to prevent overcharging of a traction battery of the vehicle.

When an electric vehicle is traveling downhill, experiencing regenerative braking, or otherwise forcing the vehicle motor to turn faster than the commanded motor torque, the vehicle motor produces electrical energy that can be used to recharge a vehicle battery. However, if the vehicle battery is already nearly or fully charged, the excess electrical energy produced may damage the battery. Control systems described herein may reduce and/or dispose of the excess energy by manipulating the motor flux (i.e., direct) current and quadrature current independently.

A through the road (TTR) hybridization strategy is proposed to facilitate introduction of hybrid electric vehicle technology in a significant portion of current and expected trucking fleets. In some cases, the technologies can be retrofitted onto an existing vehicle (e.g., a trailer, a tractor-trailer configuration, etc.). In some cases, the technologies can be built into new vehicles. In some cases, one vehicle may be built or retrofitted to operate in tandem with another and provide the hybridization benefits contemplated herein. By supplementing motive forces delivered through a primary drivetrain and fuel-fed engine with supplemental torque delivered at one or more electrically-powered drive axles, improvements in overall fuel efficiency and performance may be delivered, typically without significant redesign of existing components and systems that have been proven in the trucking industry.

The invention relates to a method for operating a vehicle (1), wherein the vehicle (1) comprises: a driveline (2, 4) configured to provide a driving power to at least one wheel (3) of the vehicle (1) for propulsion of the vehicle (1); and a wheel brake system (5) configured to brake the vehicle (1), wherein the method comprises the steps of: receiving (S1) a control signal indicative of a request for acceleration or deceleration of the vehicle (1), wherein the acceleration or deceleration control signal is generated by an accelerator device, such as an accelerator pedal, configured to be acted upon by a driver of the vehicle (1); and controlling (S2) the driveline (2, 4) in response to the acceleration or deceleration control signal. The method comprises the steps of: providing (S3) an acceleration or deceleration threshold limit representing i) the highest vehicle acceleration that can be allowed for the received acceleration control signal in the current circumstances, or ii) the lowest vehicle deceleration that can be allowed for the received deceleration control signal in the current circumstances; determining (S4) a resulting vehicle acceleration or deceleration that is or will be the result from the step of controlling the electric driveline in response to the acceleration or deceleration control signal; comparing (S5) the resulting vehicle acceleration or deceleration with the corresponding acceleration or deceleration threshold limit and determining whether the resulting vehicle acceleration is or will be higher than the acceleration threshold limit or whether the resulting vehicle deceleration is or will be lower than the deceleration threshold limit; and when the resulting vehicle acceleration is or will be higher than the acceleration threshold limit or when the resulting vehicle deceleration is or will be lower than the deceleration threshold limit; applying (S6) the wheel brake system (5) so as to reduce an actual vehicle acceleration or increase an actual vehicle deceleration towards the corresponding acceleration or deceleration threshold limit.

Systems and methods provide control the amount of battery SOC of a hybrid vehicle prior to reaching a downgrade section of roadway in order to offset the amount of energy that the hybrid vehicle will recuperate when traveling the downgrade. Navigation systems and methods are used to identify upcoming road conditions, such as downgrades. In this way, the battery SOC of the hybrid vehicle can maintain the capacity to allow a motor of the hybrid vehicle to assist in decelerating the hybrid vehicle during the downgrade if need be. Additionally, a situation where the battery is fully charged before reaching the end of the downgrade is avoided, which if not, could result in overcharging the battery, or having to switch to an engine-only mode of travel, where a driver must supplement engine braking with friction braking.

Systems and methods provide accurate determinations of relevant vehicle mass that can take into account any load being carried and/or towed by a vehicle, such as an electric vehicle or hybrid vehicle. Systems and methods also provide accurate road load measurements that can take into account road gradient(s) and the impact of gravity. Accordingly, the dynamic nature of relevant vehicle mass and road load can be captured. Efforts to optimize operation and/or take preemptive action to provide more efficient performance, enhance the drive experience, etc. can be better achieved through the more accurate determinations of relevant vehicle mass and road load achieved by these systems and methods.

An electric brake system and a method for controlling the same are disclosed. The electric brake system includes a pedal sensor configured to sense a pedal effort, a calculator configured to calculate a target brake pressure based on the sensed pedal effort, a first hydraulic circuit configured to form a brake pressure of at least one rear wheel or form a rear-wheel regenerative braking pressure, a second hydraulic circuit configured to form a brake pressure of at least one front wheel, and a controller configured to perform rear-wheel regenerative braking during deceleration of a vehicle, perform cooperative control of a front-wheel hydraulic pressure when a rear-wheel regenerative braking pressure reaches a maximum regenerative braking pressure, increase the front-wheel hydraulic pressure to a target brake pressure when the rear-wheel regenerative braking is released, and then increase a rear-wheel hydraulic pressure.

A parking brake fail safety control system and method for a vehicle having an electric-axle, may enable safe parking braking on a level ground, a slope, etc. By controlling the torque from a first motor configured for a rear wheel-first electric-axle and the torque from a second motor configured for a rear wheel-second electric-axle to have the same magnitude in opposite directions and by increasing/decreasing the torque from the first motor and the torque from the second motor, depending on a change of wheel speed when a parking brake fails.

An acceleration/deceleration control apparatus includes a mode switching portion configured to switch a normal mode of performing acceleration control in response to an operation on an accelerator pedal and also performing deceleration control in response to an operation on a brake pedal, and a one-pedal mode of performing both the acceleration control and the deceleration control in response to the operation on the accelerator pedal according to a switching operation performed by a driver. Where a mode is switched from the normal mode to the one-pedal mode, one-pedal instruction switching portion (35B) of the acceleration/deceleration control apparatus outputs such one-pedal acceleration/deceleration instruction value A(Xa) that a result of adding a non-one-pedal acceleration instruction value B1(Xb) for the one-pedal mode and a one-pedal acceleration instruction value Ab(Xa) for the one-pedal mode after the mode is switched matches non-one-pedal deceleration instruction value Bn(xb) for the normal mode before the mode is switched.