Method for controlling driven manual or automatic gearbox

A technology of gearbox and transmission ratio, which is used in transmission control, road vehicle drive control system, control device, etc.

Active Publication Date: 2015-09-23
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the engine speed will approach the maximum speed very quickly, a

Method used

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  • Method for controlling driven manual or automatic gearbox
  • Method for controlling driven manual or automatic gearbox
  • Method for controlling driven manual or automatic gearbox

Examples

Experimental program
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Example Embodiment

[0012] The graph below the only figure shows the gradient of the road the vehicle has passed in a period of 500 seconds. The selection of this time interval is contingent, and it should be understood that the time interval can be different. In the first 100 seconds, the slope continued to rise. Then the slope remains constant for 100 seconds, and then slowly drops until the end of the time interval.

[0013] The driver of the vehicle activates the speed regulator while starting the journey. Fix the speed to the set value, which is 130km / h.

[0014] The driver of the vehicle depresses the accelerator, which causes the automatic transmission to change the gear ratio in order to keep the engine speed within a predetermined range.

[0015] After about 50 seconds, the speed setpoint fixed by the driver is reached, however, the gradient then keeps increasing and the engine group (GMP) can no longer maintain the speed setpoint. The speed is reduced, and the automatic transmission shifts...

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PUM

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Abstract

The invention relates to a method for controlling a driven manual or automatic gearbox with a speed regulator pertaining to a vehicle traveling uphill, said method consisting in: regulating the speed to a nominal value set by the driver of the vehicle; acquiring the immediate values of the speed and the engine torque; estimating the resistive efforts based on values of speed and engine RPM; calculating, on the basis of the estimation of the resistive efforts and the maximum torque of the heat engine, the maximum vehicle acceleration possible in the gearbox gear ratio above the one that is engaged; and activating, or not, a vehicle speed limiting function (BVV) at a speed set value corresponding to the maximum speed for the heat engine according to whether the maximum acceleration possible in the higher gear ratio is negative or positive, respectively.

Description

technical field [0001] The invention relates to a method for controlling an automatic or manually operated transmission with a speed regulator provided on the vehicle when the vehicle is raised. Background technique [0002] A speed regulator of a motor vehicle is a system for automatically stabilizing the speed of a motor vehicle and / or fixing a maximum limit speed, called a speed limiter. The driver fixes the speed at the speed he wants to travel, and then the automation ensures that the speed thus limited is relayed and maintained. The system is well received over long distances and generally makes the best use of fuel consumption. The system also prevents inadvertent overspeed. Transmission control methods are known in the prior art which are able to follow a speed setpoint fixed by the driver. [0003] In some cases, such as a steep ascent or ascent with a heavy load, the vehicle cannot maintain speed. When the vehicle has decelerated sufficiently, a shift is made t...

Claims

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Application Information

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IPC IPC(8): B60W30/14B60W10/11B60W50/06B60W50/08F16H61/16
CPCB60W50/087B60W50/06B60W2530/16B60W10/11F16H2061/163B60W2510/0638B60W30/143B60W2510/0657B60Y2300/143B60Y2300/146F16H61/10F16H63/50F16H2059/663F16H2061/0216F16H2061/0234
Inventor T·赫克斯韦勒
Owner PEZHO SITROEN AUTOMOBILS SA
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