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Method for controlling a propulsion unit to prevent loop stalling during vehicle pull-away (launch)

A vehicle power and assembly technology, applied in mechanical equipment, clutches, etc., can solve problems such as heat engine stall, reduce pollution and improve driving performance.

Active Publication Date: 2020-03-24
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is understood that if the monitoring of the powertrain does not take into account the abnormal driving situation, the hot engine will experience repeated flameouts

Method used

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  • Method for controlling a propulsion unit to prevent loop stalling during vehicle pull-away (launch)
  • Method for controlling a propulsion unit to prevent loop stalling during vehicle pull-away (launch)
  • Method for controlling a propulsion unit to prevent loop stalling during vehicle pull-away (launch)

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Experimental program
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Embodiment Construction

[0021] The invention is applicable to any type of motor vehicle in which the powertrain includes an automatic clutch and a traction heat engine that may stall. figure 2 A powertrain is shown comprising a traction chain in which a heat engine 21 is drivingly connected to wheels 24 via an automatic coupling 22 . The coupling device 22 may selectively couple the heat engine 21 to the wheels 24 according to a transmittable torque setting. A gearbox 23 drivingly connects the coupling 22 to the wheels 24, allowing the introduction of a reduction ratio. The automatic coupling device 22 is a clutch which is torque-controlled by the control device according to the transmittable torque setpoint between the heat engine 21 and the gearbox 23 . The transmittable torque setpoint is given by the control function taking into account the driver's wishes and the powertrain coordination strategy, in particular the energy and vehicle situation strategy.

[0022] image 3 Shown is a control mo...

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Abstract

The invention relates to a method for controlling a vehicle propulsion unit to prevent loop stalling during a vehicle pull-away (launch) phase, in which the method controls the transmission of torquefrom an automated coupling device according to a transmittable torque launch setpoint (CS-dec) defined by a first torque-increase gradient (P) and, according to the invention, when stalling (CAL) is detected, the transmission of torque from the coupling device is controlled according to a transmittable torque uptake setpoint (CS_rp) defined by a second torque-increase gradient (PB) which is lowerthan the first gradient (P) of the launch setpoint (CS_dec).

Description

technical field [0001] The invention relates to a method of controlling the powertrain of a motor vehicle for preventing repeated stalling of a heat engine during a vehicle start-up phase. Background technique [0002] It can occur when a motor vehicle is started that the extraction of engine torque by the clutch for transmission to the wheels is greater than the load on the thermal engine, especially when the thermal engine is operating under non-optimal conditions, such as high altitude, high temperature driving or Driving in degraded mode is a possible cause. In the case of an automatic clutch, stalling can be caused due to torque extraction before the optimum engine speed is reached, or due to the extraction of torque being greater than the load on the thermal engine. This results in a reduction in speed and stalling of the heat engine. [0003] In addition, it is possible that the powertrain repeatedly stalls. This situation is figure 1 shown in the figure 1 In , t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16D48/08
CPCF16D48/08F16D2500/10412F16D2500/1085F16D2500/3027F16D2500/30412F16D2500/30421F16D2500/3066F16D2500/3067F16D2500/3068F16D2500/3069F16D2500/5048F16D2500/7041
Inventor 加埃唐·罗可尤汉·米豪
Owner PEZHO SITROEN AUTOMOBILS SA