Renault S.a.s.

Clement Petit

Yann Chazal

Ludovic Martin

Iwona Jedruch

Mathieu Mefflet

Julien Allard

Ronan Le-Bras

Ronan Le Bras

A method for detecting a failure of a charge air cooler placed in an air supply circuit of an engine, the circuit including an air filter and a compressor. The method is performed continuously and repeatedly. The method includes: determining temperature Tair of the air between the filter and the compressor, the temperature of the air Tapc between the compressor and the cooler, and the temperature of the air Tsras between the cooler and the engine; calculating the Tapc-Tsras/Tapc-Tair ratio, which is a parameter indicative of effectiveness of the cooler; comparing the parameter against a predetermined threshold effectiveness value; and making a diagnosis as to whether the cooler is operating correctly or incorrectly, on the basis of the comparison.

Method for detecting the failure of a charge air cooler

A motor vehicle driving assistance method including at least one electric motor powered by a battery and capable of driving drive wheels of the vehicle, the method including calculating an optimized consumption for the vehicle from an actual power consumption of the vehicle and from values collected by sensors of the vehicle, over a same path that the vehicle is in a process of traveling, the optimized consumption corresponding to a reference driving style; and informing the driver of a distance that he/she could travel using the power supply available on-board the vehicle if he/she were to adopt the reference driving style, or else the driver is informed of energy savings per unit of distance traveled that he/she might obtain if the reference driving style were adopted.

Motor vehicle driving assistance method with a view to optimizing the use of the power supply

A method for diagnosing a failure of an EGR circuit of an engine including an EGR exchanger, an EGR valve, a bypass duct of the EGR exchanger, and a bypass flap arranged upstream from the EGR exchanger and the bypass duct to adjust a proportion of exhaust gases flowing therethrough. The EGR circuit can be activated according to a cooled mode, in which the flap is shut, or according to a bypass mode, in which the flat is open. The method carries out, during a diagnosis phase, two activations of the flap, and measures an average of variations of the EGR gas temperature at an outlet of the EGR exchanger during the diagnosis phase.

Method for diagnosing the exchanger bypass flap in an exhaust gas recirculation circuit

Growing community of inventors

Paris, France

Clement Petit