JPH069877Y2 - Traction control device for automobile - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to a vehicle for transmitting the output of an engine to driving wheels through an automatic transmission (A / T),
The present invention relates to a traction control device for an automobile that does not excessively reduce the driving force after upshifting.

(Prior Art) In order to perform ideal driving force control, it is necessary to reduce the engine output according to the road surface μ. Therefore, in order to obtain sufficient performance even on a road surface with a low μ such as on ice, it is necessary to increase the variable control width of the engine output and reduce the engine output.

(Problems to be solved by the invention) In an automatic transmission (A / T) vehicle, the driving force becomes too low when shifting (shifting up). That is, in the process of upshifting, the rotation of the drive shaft is accelerated by the ratio of the gear ratio before and after the upshifting, but when the road surface μ is high, the speedup of the rotation is suppressed by the road surface torque and the engine speed on the input side is reduced. The rotation is reduced and the rotation is synchronized. However, when the road surface μ is low, the road surface torque is small, so the rotation of the drive shaft is accelerated and the idling ratio is increased. After the upshift, the drive torque is reduced by the gear ratio, so even though the drive torque is reduced, the engine output is reduced to reduce the idling ratio, and the driving force drops too much. Becomes

The purpose of the present invention is to convey the output of the engine to the drive wheels through an automatic transmission,
An object of the present invention is to provide a traction control device for an automobile, which is configured to reduce the driving force after upshifting.

[Constitution of device] (Means and action for solving problems) Output of engine is changed to automatic transmission (A
/ T) to the drive wheels in a vehicle, the sensors that detect the wheel speeds of the drive wheels and the non-drive wheels respectively, and the drive wheels based on the wheel speeds of the drive wheels and the non-drive wheels detected by both sensors A drive wheel idling ratio calculating means for calculating the idling ratio, an output control decrease amount determining means for determining a necessary decrease amount of the output of the A / T according to the idling ratio calculated by the drive wheel idling ratio calculating means, When the reduction amount determined by the output reduction amount determining means is less than or equal to the set amount, the output control of the engine is performed according to the reduction amount, and the reduction amount determined by the output control reduction amount determining means is the set amount. A traction control device for an automobile, comprising output control means for performing the upshift control of the A / T when it exceeds the above, and reduction means for reducing the reduction amount by a predetermined ratio within a set time after the upshift. .

(Embodiment) Hereinafter, a traction control device for an automobile according to an embodiment of the present invention will be described with reference to the drawings. First
In the figure, 11 is a microcomputer for controlling the driving force of the engine. This microcomputer 1
Detection signals from a wheel speed sensor 12 for detecting wheel speeds are input to the driving wheels and the non-driving wheels. Reference numeral 13 denotes A / T shift-up detection means for detecting shift-up of A / T (not shown), and the detection signal is the microcomputer 1
Input to 1. The microcomputer 11 calculates the idling ratios of the driving wheels and the non-driving wheels based on the signals input from the wheel speed sensor 12, and outputs the reduction amount x to the engine output reducing means 14 according to the idling ratios to drive the wheels. The engine output is reduced so that the wheels do not slip.

Next, the operation of the embodiment of the present invention configured as described above will be described. The flowchart of FIG. 2 shows the engine driving force control performed by the microcomputer 11. First, the microcomputer 11 calculates the idling ratios of the driving wheels based on the wheel speeds of the driving wheels and the non-driving wheels input from the wheel speed sensor 12, and when the idling ratio is equal to or more than a set value, the engine output reducing means 14 The engine output reduction amount x is instructed to the normal drive force control (step S1). Next, the A / T shift-up detection means 13 determines whether the A / T has been shifted up (step S2). If not upshifted, the process of step S1 is performed. If upshifted, the process proceeds to step S3 and thereafter. Then, after shifting up, it is determined whether or not the decrease amount x is equal to or more than a set value for a predetermined time (for example, 1 second) from point a in FIG. 3 (steps S3 and S4). If the amount of decrease x within the predetermined time is equal to or greater than the set value, the driving force will drop too much.
The reduction amount x is reduced to, for example, 1/2 (step S5). Then, if the reduction amount x becomes "0" or a set value or more within a predetermined time after the reduction amount x is reduced in step S5, the reduction amount is reset (steps S5 to S5).
S8).

[Effects of the Invention] As described in detail above, according to the present invention, in a vehicle in which the output of the engine is transmitted to the driving wheels via an automatic transmission, the amount of decrease that decreases the engine output for a set time after upshifting is reduced, It is possible to prevent the driving force of the engine from decreasing too much after the shift up.

[Brief description of drawings]

FIG. 1 is a diagram showing a traction control device for an automobile according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation, and FIG. 3 is a timing diagram showing the operation. 11 ... Microcomputer, 12 ... Wheel speed sensor, 13 ... A / T shift-up detection means, 14 ... Engine output reduction means.

Claims (1)

[Scope of utility model registration request] 1. A vehicle for transmitting the output of an engine to driving wheels via an automatic transmission (A / T), sensors for detecting wheel speeds of driving wheels and non-driving wheels, and driving wheels detected by both sensors. And the drive wheel idle rotation rate calculation means for calculating the idle rotation rate of the drive wheel based on each wheel speed of the non-drive wheel, and the output of the A / T according to the idle rotation rate calculated by the drive wheel idle rotation rate calculation means is required. Output control reduction amount determining means for determining the reduction amount, and when the reduction amount determined by the output reduction amount determining means is less than or equal to a set amount, the output control of the engine is performed according to the reduction amount, and the output control reduction is performed. When the amount of decrease determined by the amount determining means exceeds the set amount, output control means for performing the A / T shift-up control, and the amount of decrease is reduced by a predetermined ratio within the set time after the shift-up. Traction control device of a motor vehicle, characterized by comprising a reduction means that.