A vehicle control system which can ensure high reliability, real-time processing, and expandability with a simplified ECU configuration and a low cost by backing up an error through coordination in the entire system without increasing a degree of redundancy of individual controllers beyond the least necessary level. The vehicle control system comprises a sensor controller for taking in sensor signals indicating a status variable of a vehicle and an operation amount applied from a driver, a command controller for generating a control target value based on the sensor signals taken in by the sensor controller, and an actuator controller for receiving the control target value from the command controller and operating an actuator to control the vehicle, those three controller being interconnected via a network. The actuator controller includes a control target value generating unit for generating a control target value based on the sensor signals taken in by the sensor controller and received by the actuator controller via the network when the control target value generated by the command controller is abnormal, and controls the actuator in accordance with the control target value generated by the control target value generating unit.

Vehicle Control System

A method and system for executing a shift from a first fixed gear to a second fixed gear in a powertrain system comprising a two-mode, compound-split, electro-mechanical transmission operative to receive a speed input from an engine is described. It includes deactivating an off-going clutch, and generating a time-based profile for rotational speed of an oncoming clutch. The input speed is controlled based upon the rotational speed of the oncoming clutch and an output of the transmission. The oncoming clutch is actuated, preferably when the input speed is synchronized with a rotational speed of an output shaft of the transmission multiplied by a gear ratio of the second fixed gear, preferably after a predetermined elapsed period of time in the range of 500 milliseconds.

Method and apparatus to control an electro-mechanical transmission during shifting event

A declaration control apparatus and method for a vehicle, which performs deceleration control such that a deceleration acting on the vehicle becomes equal to a target deceleration by an operation of a brake system which applies a braking force to the vehicle and a shift operation which shifts a transmission of the vehicle into a relatively low speed or speed ratio, increases the target deceleration over time at a predetermined gradient to a predetermined value when a determination that there is a need to shift the transmission into a relatively low speed or speed ratio has been made, and after the target deceleration reaches the predetermined value, maintains the target deceleration at a generally constant value. As a result, a deceleration transitional characteristic of the vehicle is able to be improved.

Deceleration control apparatus and method for a vehicle

An engine and an electronic control unit perform cooling capacity increase control for compensating for a insufficiency of the cooling capacity of a cooling device. The electronic control unit performs a variety of control for a vehicle, including control of the cooling device. At that time, the electronic control unit calculates the target value of the cooling capacity of the cooling device, calculates the estimate value of the cooling capacity that will be able to be exerted in the future under the current control, compares the target value and the estimate value, and when it is determined from the result of the comparison that the cooling capacity will be insufficient, performs the cooling capacity increase control. The electronic control unit changes the contents of the cooling capacity increase control according to the degree of insufficiency of the estimate value with respect to the target value.

Control device for vehicle

An apparatus and method for controlling the engagement rate of a clutch (12) having an input member (11a) and an output member (13a) for selectively connecting an engine (11) to a transmission (13) includes first and second sensors (25, 21) which generate signals representing the rotational speed of the input and output members (11a, 13a), respectively. A controller (20) generates a desired engine speed signal and a control signal representative of an engagement rate of the clutch (12). The controller (20) modifies the control signal when the rotational speeds of the input member (11a) and the output member (13a) are approximately equal to the desired engine speed. A clutch actuator (16) controls the engagement rate of the clutch (12) in response to the control signal.

Method and apparatus for operating a clutch in an automated mechanical transmission

A device for controlling an automatic motor vehicle clutch is arranged between a driving enging and a transmission. This clutch operates primarily as a starting clutch and the engine torque TM and the rotational speeds before and after the clutch nM, nGE are detected or measured. A control device transforms an electric signal coming from an electronic control unit into a control value for the regulating device for the opening and closing of the clutch from the frequency and the amplitude of the engine speed and/or the transmission input speed, unacceptable vibrations (S) in the drive train betweeen the engine, clutch and transmission are detected and eliminated through a predetermined opening of the clutch. This opening takes place up to a path mark which is derived from a characteristic curve stored in an electronic control unit. For this purpose, during each starting process, in the reversal point UP of the rotational speed of the engine nM the corresponding engine torque TM and path marks WM from the coupling path are stored and the characteristic curve is computed and continuously renewed through running measurements and is improved as a result of the frequent measurements.

Device for controlling an automatic motor-vehicle clutch

A device for the control of an automatic motor vehicle clutch is arrayed between an engine and a geaar box and acts primarily as a start-up clutch. A control device receives an electric signal coming from an electronic control device and transforms it into a control quantity for an actuator which engages and disengages the clutch. The engagement of the clutch at start-up occurs with a basic clutch-in speed dependent upon the positioning of the gas pedal and initiated by this positioning and is determined as an electric signal by an electronic control device. For this purpose, a characteristic curve which was determined specifically for the engine is stored in the memory of the electronic control device so that in dependence on the displacement angle of the gas pedal the basic clutch-in speed can be determined very quickly and in a simple manner. It is possible to further improve the quality of the clutch-in process by means of correction factors which are multipliers for the basic clutch-in speed. The highest requirements of a clutch are satisfied when, shortly before reaching the point of synchronization, the clutch is displaced once more in direction of disengagement, whereby the moment of disengagement as well as the disengagement speed are likewise determined by characteristic curves.

Device and method for the control of an automatic vehicle clutch

The method involves introducing an active engagement of the service brake over the duration of the phase without traction force, whereby auxiliary braking is electronically controlled with the aid of evaluation logic for the driving status. The duration of the brake engagement is limited with respect to time.

Braking by auxiliary pressure in the thrust mode of automatic transmission for lorries

Die Erfindung betrifft ein Verfahren zur Aufhebung von Zahn-auf-Zahn-Stellungen ZaZ beim Einlegen von Gangen in Getrieben. Einer feinfuhligen Einstellung der Fahrkupplυng zum Einbringen eines Drehmomentes zum Drehen der Antriebswelle des Getriebes zur Uberwindung von Zahn-auf-Zahn-Stellungen sind bedingt durch die im Verhaltnis zur hierfur benotigten und erwunschten Leistung Grenzen gesetzt. Dies kann zu einem als unangenehm empfundenen Ruck des Fahrzeugs oder zu einem deutlich wahrnehmbaren Einrastgerausch der beteiligten formschlussigen Elemente sowie zu einer unerwunschten mechanischen Belastung dieser Elemente fuhren. Das erfindungsgemase Verfahren schafft hier Abhilfe, indem die Fahrkupplung unabhangig vom Auftreten einer Zahn-auf-Zahn-Stellung bei jedem Schaltvorgang in eine Stellung gebracht wird, die eine geringe vorbestimmte Drehmomentubertragung an die Antriebsweile des Getriebes ermoglicht und dieses Drehmoment an einer oft ohnehin vorhandenen Getriebebremse abstutzt. Die Getriebebremse ist aufgrund ihrer erheblich kleineren Dimensionierung sehr viel schneller und genauer in der Lage, bei einer auftretenden Zahn- auf-Zahn-Stellung einen nach Betrag und zeitlichem Verlauf gewunschten Drehmomentverlauf an der Antriebswelle des Getriebes einzustellen und so die Auflosung von Zahn-auf-Zahn-Stellung deutlich zu verbessern.

Verfahren zur Aufhebung von Zahn-auf-Zahn-Stellungen beim Einlegen von Gängen in Getrieben

A motor-vehicle clutch assembly including a start-up and shifting clutch arranged between the driving engine and the gearbox, selectively engaged therebetween by the clutch controlled by an electronic control device and by a complex actuating unit arranged on the clutch. The complex actuating unit consisting of an actuating cylinder for a clutch release lever, several, solenoid valves controlling the auxiliary power and a travel-measuring device. The unit is provided with a singly detachable connection for the pressure supply and for the connection with the electronic control device and the power source, only one plug junction is provided.

Norbert Wiencek

Papers

Device for controlling an automatic motor-vehicle clutch

Device and method for the control of an automatic vehicle clutch

Braking by auxiliary pressure in the thrust mode of automatic transmission for lorries

Verfahren zur Aufhebung von Zahn-auf-Zahn-Stellungen beim Einlegen von Gängen in Getrieben

Clutch assembly for a motor vehicle