CN-114938641-B - Optimization method for optimizing the hot engine speed of an automatic gearbox vehicle during docking

CN114938641BCN 114938641 BCN114938641 BCN 114938641BCN-114938641-B

Abstract

The invention relates to an optimization method for optimizing a hot engine speed (30) of an automatic gearbox (32) vehicle during docking, for implementing an optimization device (1) in communication with an engine control module (2) and a clutch control module (5), comprising the steps, wherein real-time engine speed information (RMTH) is provided by the engine control module (2) to the optimization device (1), a further step, wherein the real-time engine speed information (RMTH) is compared by the optimization device (1) with engine speed set point information (CRM), -and a further step, wherein in case of a mismatch between real-time engine speed (RMTH) information and engine speed set point (CRM) information, the optimization device (1) transmits an attenuation Factor (FG) to the clutch control module (5), which attenuation factor is used for attenuating the clutch torque gradient to limit the clutch torque gradient.

Inventors

ROCQ GAETAN
Y rice about
A bardeh
HABBANI RIDOUAN
V Freire Suarez
BASTIANI PHILIPPE

Assignees

标致雪铁龙汽车股份有限公司

Dates

Publication Date: 20260508
Application Date: 20201207
Priority Date: 20200109

Claims (5)

1. An optimization method for optimizing the rotational speed of a thermal engine (30) of a vehicle with an automatic gearbox (32) during a docking, the vehicle further comprising a clutch system (31), a gearbox (32) comprising an electric motor (320) ensuring control of the transmission motion transmitted to the wheels (4) of the vehicle, the docking of the thermal engine (30) being ensured by the slip of the clutch between the thermal engine (30) in rotation and a spindle (AP) coupled to the wheels (4), the method being implemented by an optimization device (1) communicating with an engine control module (2) and a clutch control module (5), The method comprises the following steps: -a step wherein real-time thermal engine speed (RMTH) information is provided by the engine control module (2) to the optimizing means (1), -A further step, wherein the real-time thermal engine speed (RMTH) information is compared by the optimizing means (1) with thermal engine speed set point (CRM) information, -And a further step, wherein in case of a mismatch between real-time hot engine speed (RMTH) information and hot engine speed set point (CRM) information, the optimizing means (1) transmits a damping Factor (FG) to the clutch control module (5), the damping factor being used to damp the clutch torque gradient to limit the clutch torque gradient, The damping Factor (FG) for damping the clutch torque gradient is calculated on the basis of a thermal engine load Factor (FCM) as a function of an applied torque (CMT) of the thermal engine and as a function of a maximum torque (CMTmax) and on the basis of a rotational speed deviation gradient between a real-time thermal engine rotational speed (RMTH) and a thermal engine rotational speed setpoint (CRM).
2. The optimization method according to claim 1, characterized in that the hot engine speed setting (CRM) information is calculated by the engine control module (2) based on an engine torque setting (CCM) that is identified following the position information (PA) of the accelerator pedal (6) actuated by the driver.
3. An assembly for optimizing the rotational speed of a thermal engine (30) in a vehicle during a docking, the vehicle further comprising a clutch system (31), an automatic gearbox comprising an electric motor (320) ensuring control of the transmission movement to the wheels (4) of the vehicle, the docking of the thermal engine (30) being ensured by the slip of a clutch between the rotating thermal engine (30) and a main shaft (AP) coupled to the wheels (4), the assembly being for ensuring implementation of a method according to any one of claims 1 to 2 and being characterized by comprising an optimizing device (1), an engine control module (2) and a clutch control module (5), the engine control module (2) for providing real-time thermal engine rotational speed (RMTH) information to the optimizing device (1), the optimizing device (1) being adapted to compare the real-time thermal engine rotational speed (RMTH) information with thermal engine rotational speed set point (CRM) information and to transmit a damping Factor (FG) to the clutch control module (5), the damping Factor (FG) being for adapting the thermal gradient of the clutch rotational speed (CRM) to the thermal gradient (CRM) between the conditions, the optimizing device (1) calculates the damping Factor (FG) for damping the clutch torque gradient on the basis of a thermal engine load Factor (FCM) as a function of an applied torque (CMT) of the thermal engine and as a function of a maximum torque (CMTmax) and on the basis of a rotational speed deviation gradient between a real-time thermal engine rotational speed (RMTH) and a thermal engine rotational speed setpoint (CRM).
4. An assembly according to claim 3, characterized in that the engine control module (2) calculates the hot engine speed setting (CRM) information based on an engine torque setting (CCM) identified following the position information (PA) of the accelerator pedal (6) actuated by the driver.
5. A vehicle equipped with an assembly according to claim 3 or 4.

Description

Optimization method for optimizing the hot engine speed of an automatic gearbox vehicle during docking Technical Field The present invention claims priority to French application number 2000152 filed on 1/9/2020, the contents of which (text, figures and claims) are incorporated herein by reference. The invention relates to a method for optimizing the hot engine speed of an automatic gearbox vehicle during docking, and to a vehicle implementing such a method. Background PHEV (plug Hybrid ELECTRIC V e-hicul e) type Hybrid vehicles generally comprise a hot engine, an electric machine, a clutch, a gearbox for coupling the clutch to the wheels via one or more gear ratios, the clutch being able to be docked by sliding between the hot engine and the gearbox, the electric machine being connected on a network and coupled to the gearbox, and a main reservoir of the battery type. The use of the clutch enables decoupling between the thermal engine and the wheels. The clutch is capable of transmitting the torque of the engine by sliding between the speed of the hot engine and the speed of the motor coupled to the wheels, the hot engine being practically available only when a minimum speed is exceeded, called idle speed. During engine docking (e.g., starting or cranking of an operating (enroulant) engine and then docking for a hybrid vehicle), the rotational speed of the engine needs to be mastered in order to respond to different constraints-the rotational speed of the engine must be prevented from dropping to avoid the engine stalling, the main shaft must be enabled to perform sufficient torque transfer for the driver, and the acoustic and vibration levels of the engine must be optimized by having the engine follow a specific rotational speed. However, in these cases of interfacing of the engine and with reference to the basic equations of dynamics, the rotational speed of a given engine is the (co-caused) result of the torque provided by the hot engine and the torque intercepted by the clutch and provided to the wheels. Therefore, a compromise between the torque of the hot engine and the torque of the clutch has to be handled. Some existing solutions aim to manage the engine interfacing by using the clutch to implement the torque required by the driver. Another solution aims at regulating the rotational speed of the hot engine, in a regulatory manner (en gulation), so as to guarantee compliance with the multi-performance (multi prestations) constraints following the optimal (optimal) rotational speed of the engine, while providing the torque required for the torque transmission to the wheels via the clutch. From FR3054189 a control device is known for controlling the torque provided by a drive machine of a parallel hybrid vehicle with a manual gearbox as a function of the clutch, in which document the technical solution provided determines the limiting (limit) torque of the drive motor as a function of the position of the clutch pedal. The device cannot avoid transmitting excessive torque to the hot engine and is only applied to a powertrain with manual gearbox and with clutch pedal. Disclosure of Invention The present invention provides an operational alternative that avoids acoustic and vibration inconveniences and is able to follow the driver's wishes. To this end, the invention relates to an optimization method for optimizing the hot engine speed of an automatic gearbox vehicle during a connection, the vehicle further comprising a clutch system, a gearbox comprising an electric motor for ensuring control of the transmission motion for transmission to the wheels of the vehicle, the connection of the hot engine being ensured by the slip of the clutch between the hot engine in rotation and a spindle coupled to the wheels, the method being implemented by an optimization device in communication with an engine control module and a clutch control module. The method according to the invention comprises the steps of providing real-time engine speed information by the engine control module to the optimizing means, wherein the real-time engine speed information is compared by the optimizing means with engine speed set point information, and a further step, wherein in case of mismatch between real-time engine speed information and engine speed set point information, the optimizing means transmits an attenuation factor to the clutch control module for attenuating the clutch torque gradient to limit the clutch torque gradient. As a result of this implementation, the method according to the invention is able to follow the driver's wishes by providing a higher hot engine torque, due to a higher rotational speed of the hot engine. The method also solves acoustic and vibration inconveniences, as the speed of the hot engine follows its own optimal speed set point. Furthermore, the method avoids flameout of the hot engine by keeping the speed of the hot engine away from its idle speed. Finally, the method limits the risk of collision