Volkswagen Ag

Skoda Auto A.s.

David Prochazka

Ekkehard Pott

Michael Zillmer

Matthias Holz

In a method and a device for engine stop/engine start of hybrid vehicles, which includes an internal combustion engine and an electric machine which is coupled to the internal combustion engine and is selectively able to be operated regeneratively or motively, the engine speed can be detected and compared to a limit speed to initiate the stopping of the engine in a hybrid vehicle using an automatic start/stop mechanism, and if the engine speed drops to the threshold speed, the engine is stopped, the electric machine being switched over into the motive or the regenerative operation when the limit speed is reached; the electric machine assuming the limit speed, whereas the fuel supply of the internal combustion engine is shut down or remains shut down and the electric machine initiates the stopping of the internal combustion engine.

Method and device for stopping and starting the engine of hybrid vehicles

A method and a device are for the optimized starting of an internal combustion engine using a starter, which is connected to a capacitor store, the capacitor store being connected via a DC/DC converter to a vehicle electrical system of a vehicle, and the vehicle electrical system including an energy store for supplying electrical energy having a nominal voltage, and the starter consuming a starting energy for starting the internal combustion engine, which is a function of a temperature of the internal combustion engine, the temperature of the internal combustion engine being measured by at least one temperature sensor and the capacitor store being charged to a setpoint voltage with the aid of a battery via another DC/DC converter, which connects the battery in parallel to the capacitor store parallel to a switch, the setpoint voltage being set by a control unit such that the electrical energy stored in the capacitor store charged to the setpoint voltage is greater than the starting energy ascertained on the basis of the measured temperature.

Method and device for the optimized starting of an internal combustion engine

A method is for controlling the torque of a hybrid drive unit, which includes a combustion engine and at least one electric machine capable of being operated alternatively as a motor or as a generator. The electric machine, when operated as a motor, is powered by an energy storage device and supplies a positive electric motor torque which together with a combustion engine torque of the combustion engine produces a total drive torque of the hybrid drive unit. A hybrid drive unit includes a respective torque control. In the event that a desired torque is greater than a consumption-optimized combustion engine maximum torque, the electric machine is operated as a motor having an electric motor torque. An electric motor maximum torque is specified as a function of at least one state parameter of the energy storage device.

Method for controlling the torque of a hybrid drive unit and hybrid drive unit

A method controls an operation of a motor vehicle equipped with a hybrid drive unit having a combustion engine and at least one electric machine that can be selectively operated as a motor or as a generator. The electric machine, when in generator mode, charges an energy store and/or supplies power to a vehicle electrical system of the motor vehicle. In generator mode, the electric machine is operated in alternating intervals, while maintaining predefined boundary conditions. In a first interval, the electric machine is operated with a first high electrical power output that is higher than an actual power consumption of the vehicle electrical system of the motor vehicle. The electric machine is switched off in a second interval. This largely prevents the electric machine from approaching operating points under light load which have a low efficiency and achieves a fuel advantage in comparison to a continuous operating mode.

Hybrid motor vehicle and method for controlling operation of a hybrid motor vehicle

A hybrid vehicle has an internal combustion engine and an electric motor, in which at least one electric motor converts kinetic energy into electricity in a generator mode and can provide a generator-created braking momentum Mor a respective braking power P. When braking is requested with a target value Mat a time t, a total braking momentum M is provided according to the following formula:, if, if.A value M&#x3e;0 is selected for the braking momentum Mat the time t, wherein M&#x3e;0 is a braking momentum provided by a vehicle brake or when braking is requested with a target value Pat a time t, the vehicle is provided with a total braking power P according to the following formula:, if, if.A value P&#x3e;0 is selected for the braking power Pat the time T, wherein P&#x3e;0 is a braking power provided by the vehicle brakes.

Method for operating a hybrid vehicle

A method is for controlling an overrun condition in a hybrid vehicle having a combustion engine and additionally at least one electric motor as well as an overrun fuel cutoff, which interrupts a fuel supply to the combustion engine when the vehicle is in an overrun condition and restores the fuel supply when the combustion engine reaches or falls below a restoring speed. At least in a combustion engine at operating temperature, the fuel supply is restored at a restoring speed of at most 200 min, e.g., at most 100 minabove an idling speed of the combustion engine. The restoring speed may be in the range of the idling speed or only slightly above the latter. The restoring speed is thus clearly lowered as compared to the usual restoring speeds and extends the overrun fuel cutoff phases and thus reduces fuel consumption.

Method for controlling an overrun condition of a hybrid vehicle and hybrid vehicle

A method is for controlling the operation of an exhaust-gas sensor disposed in an exhaust duct of a motor vehicle and equipped with an internal or external sensor heating device, the motor vehicle including a combustion engine and an automatic switchoff, which causes an automatic switching off of the combustion engine when at least one stop condition is present. It is provided that: (a) following an automatic switching off of the combustion engine by the automatic switchoff, a first future instant is determined at which the exhaust-gas temperature in the exhaust duct will drop below a condensation temperature below which condensate precipitation from the exhaust gas may occur; (b) a second instant is determined at which a heat output of the sensor heating device must be interrupted or reduced so that a sensor temperature of the exhaust-gas sensor will have dropped to a maximally allowed sensor temperature no later than the first future instant; and the heat output of the sensor heating device is interrupted or reduced when the second instant is attained.

Method for controlling an operation of a heatable exhaust-gas sensor of a motor vehicle

The invention is directed to a method for controlling fuel injection in an internal combustion engine () having at least one electric machine (), wherein a direct injection system () for direct injection of fuel into at least one combustion chamber () of the internal combustion engine () is associated with the internal combustion engine (), the direct injection system () including a mechanically driven high-pressure fuel pump () for generating a fuel pressure in an accumulator volume () upstream of the at least one combustion chamber (). It is provided that during a startup process of the internal combustion engine () fuel is injected by at least one of the following measures: The startup process can be performed so as to result in considerable fuel savings and low emissions.

Method for controlling fuel injection and a motor vehicle

A method for operating a hybrid motor vehicle having an internal combustion engine and at least one electric machine is provided. At least one of the electric machines supplies a varying torque to the internal combustion engine such that cyclic irregularities of the internal combustion engine during idling are reduced and, at the same time, the internal combustion engine is operated during idling with an ignition angle and a volumetric efficiency optimized for this operating state and without retarding the ignition angle for building up a torque reserve.

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Libosovice, Czechia

David Prochazka