Method for thermal protection of vehicle internal combustion engine and corresponding engine computer
An internal combustion engine, thermal protection technology, applied in the direction of internal combustion piston engine, combustion engine, engine control, etc., can solve the problems of reduced vehicle power performance, difficulty in distinguishing critical use conditions, inapplicable protection, etc., to improve driving fun, avoid engine The effect of the flameout phenomenon
Active Publication Date: 2019-07-02
PEZHO SITROEN AUTOMOBILS SA
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Problems solved by technology
In fact, the use of non-proprietary calibrations is likely to result in a loss of reliability due to exceeding coolant temperature standards and / or generating untimely fault messages to the driver
[0006] In addition, the control rules of these thermal protection strategies are difficult to distinguish combinations of critical usage conditions, which may lead to implementation of inappropriate protection in some special operating conditions of the vehicle
Therefore, when the protection is overridden in a given operating situation, the reduction in engine torque will be excessive, which will result in a reduction in vehicle dynamics
Conversely, when the protection is less covered during operating conditions, the critical temperature is no longer observed, which would pose a risk of damage to engine components
Method used
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[0024] figure 1 It is a functional schematic diagram of different modules implementing the thermal protection method of an internal combustion engine according to the present invention. The diesel or gasoline type internal combustion engine includes a cooling circuit in which a coolant whose temperature changes with time is circulated.
[0025] More accurately, the module 10 determines the correction coefficient Ccor in the mapping method, which depends on the difference between the instantaneous temperature change speed Vi of the cooling liquid calculated by the subtractor 11 and the limit temperature change speed Vlim of the cooling liquid. The correction coefficient Ccor also depends on the limit speed value Vlim to distinguish situations where the system temperature is higher or lower than the maximum temperature Tliqu_max. The instantaneous speed Vi expressed in degrees Celsius per second is determined by the module 12.
[0026] The limit temperature change rate Vlim of the c...
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The invention mainly relates to a method for thermal protection of an internal combustion engine of a motor vehicle comprising a cooling circuit inside of which circulates a coolant liquid with a temperature that varies over time, characterised in that it comprises the step of adapting in a closed loop the maximum limitation torque (Cmax_lim) of the internal combustion engine in accordance with a correction coefficient (Ccor) which is dependent on the difference between an instantaneous temperature change speed (Vi) of the coolant liquid and a maximum temperature change speed (Vlim) of the coolant liquid. The invention also relates to the corresponding engine computer.
Description
Technical field [0001] The invention relates to a thermal protection method for a vehicle internal combustion engine, and also relates to a corresponding engine computer. The invention finds a particularly advantageous application for all diesel or gasoline type internal combustion engines equipped with a cooling circuit in which coolant is circulated. This cooling fluid is often referred to by the term "water", although it is usually based on glycols. [0002] technical background [0003] The purpose of the thermal protection strategy is to limit the mechanical power of the engine by reducing the torque provided by the engine in a thermally critical operating condition, in order to especially meet the temperature standard of the coolant. [0004] The cost and performance constraints imposed on the engine and cooling circuits are increasing, and thermal protection strategies have been observed to be triggered more frequently in more vehicle operating conditions. However, the devel...
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IPC IPC(8): F02D41/22F02D41/14
CPCF02D41/22F02D41/1497F02D2200/021F02D2250/18F02D2250/26Y02T10/40
Inventor 法布里斯·沙迪尔西里尔·伯特兰菲利普·特谢尔
Owner PEZHO SITROEN AUTOMOBILS SA