摘要:
The invention relates to a method for controlling an internal combustion engine of a motor vehicle having an auxiliary force brake device wherein the auxiliary force is generated by coupling the brake actuation to the manifold pressure of the engine. In the method, the engine is operated with increased manifold pressure during the warm-up phase after a cold start. In the method, an actuation of the brake effects limiting the manifold pressure to a maximum value by intervening in the engine control. This maximum value is less than the value which would otherwise adjust under the same conditions without brake actuation.
摘要:
The invention is directed to a method and an arrangement for controlling an adjusting device of a drive unit in a motor vehicle. When the ignition is switched on, the value then present for the driver command is interpreted as an idle command independently of its absolute magnitude.
摘要:
An arrangement controls the torque to be supplied by a drive unit of a motor vehicle especially a motor vehicle at standstill or a rolling motor vehicle. Apparatus are provided which compute the adjustment of the power parameters of the drive unit which is necessary for making this torque available. A correction is provided at least in dependence upon the torque requirement of a transmission unit of the motor vehicle in idle or near-idle range outside of driving operation. In addition, corrective devices with respect to engine torque loss as well as torque requirements of ancillary equipment of the motor vehicle are provided. These characteristic fields are adaptatively determined in a further embodiment and can be adapted to deterioration.
摘要:
The invention is directed to a method and an arrangement for controlling the drive power of a motor vehicle wherein a controllable transmission unit is acted upon in such a manner that the load of the drive unit is at least reduced for the operating state of the motor vehicle wherein the vehicle is at standstill and/or is rolling slowly. When leaving this operating state, the control of the drive power is delayed until the complete force connection is reestablished.
摘要:
The electronic counter for counting a periodic clock signal generated at a preset clock frequency (f.sub.o) includes a clock circuit generating the periodic clock signal at the preset clock frequency (f.sub.o); an adjustable frequency divider (4) having an output (8), a first input (5) and a second input (7), the first input of the frequency divider (4) being connected to the clock circuit (6) so as to receive the periodic clock signal and the second input (7) of the frequency divider being connected to receive a cycle speed signal (n), the frequency divider (4) containing means to produce a pulsed output signal at a divider output frequency (c.sub.o); a tracking circuit (T) connected to the output (8) of the frequency divider (4) to receive the pulsed output signal at the divider output frequency (c.sub.o) and having a correction signal input for receiving a positive or negative correction signal (KS), the tracking circuit (T) acting to add a number of additional pulses to the pulsed output signal received thereby when the correcting signal is positive and suppressing a number of the pulses of the pulsed output signal from the frequency divider when the correcting signal is negative; and a counting circuit (14) having an output and connected to the tracking circuit (T) to count the pulses received from the tracking circuit and to generate a counter reading (z.sub.s). The divider output frequency (c.sub.o) is substantially equal to the clock frequency (f.sub.o) divided by a factor (T) equal to a constant (K) depending on the frequency divider (4) and the cycle speed signal (n).
摘要:
A procedure for determining the vapor pressure of a fuel in a tank is provided, whereby the sound velocity and/or a variable representing the sound velocity are determined the in the gas-filled compartment of the tank and the vapor pressure is assumed from the sound velocity and/or from the variable representing the sound velocity at a familiar total pressure.
摘要:
Method and apparatus for detecting tank leaks, in which a gas pressure acts on a fluid which is situated in a tank, and in which the gas pressure in the tank or tank system is changed, wherein a tank leak is detected by evaluation of a temporal profile of a sum pressure of the fluid which is situated in the tank.
摘要:
The invention relates to a method for operating an internal combustion engine, which can be operated with fuels and fuel mixtures of said fuels, said fuels differing from each other in the air quantity they require for a stoichiometric combustion. A fuel quantity to be supplied to the internal combustion engine is corrected via a mixture adaptation and a fuel adaptation, the mixture adaptation and the fuel adaptation being based on a lambda control and a fuel quantity contained in the fuel reservoir of the internal combustion engine prior to refueling and a fuel quantity supplied to the reservoir being determined. The method is characterized by using the change of the fuel adaptation after refueling towards a fuel/air mixture having a higher or a lower fuel percentage to extrapolate the supplied fuel or the supplied fuel mixture and the fuel quantity present in the reservoir and the knowledge of the nature of the fuel or the fuel mixture supplied to the reservoir are used to calculate the fuel mixture ration in the reservoir after refueling. The method according to the invention allows determination of the fuel mixture ratio in the reservoir of internal combustion engines which can be operated with different fuels.
摘要:
A method of diagnosing a fuel tank leak in a fuel tank ventilation system, comprising a fuel tank, an accumulator for fuel vapors and a fuel tank ventilation valve opening out into an intake manifold of an internal combustion engine, wherein the fuel tank, the accumulator and the fuel tank ventilation valve are connected by way of a system of lines and wherein the accumulator has an aeration line with a check valve, the method comprising: immediately before turning off the internal combustion engine, closing the check valve and opening the fuel tank ventilation valve to generate a vacuum in the fuel tank ventilation system; acquiring a vacuum degradation at specifiable points in time when the fuel tank ventilation valve is closed; opening of the check valve in order to bring about a pressure equilibrium with the ambient pressure; renewed closing of the check valve; acquiring a pressure increase emerging over at least a specifiable time interval and determination of a compensation variable; and inference about the presence of a leakage from behavior of the vacuum degradation over time, while taking into account behavior of the compensation variable over time.
摘要:
A method and a device for operating a drive unit of a vehicle are provided, which result in reduced fuel consumption in the overrun condition. An output variable of the drive unit is set, in this context, according to a preset driving strategy in the overrun condition of the drive unit. At least two preset driving strategies are specified for the overrun condition of the drive unit. In the overrun condition, one of the specified driving strategies is selected as a function of a driving situation.