Vehicle control apparatus including abnormality detection

• US 5,047,944 A
• Filed: 06/29/1989
• Issued: 09/10/1991
• Est. Priority Date: 07/07/1988
• Status: Expired due to Term

• Current Assignee: Hitachi Automotive Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Original Assignee: Hitachi Automotive Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: Abe, Osamu, Ishikawa, Hideaki, Hasegawa, Taiji
• Primary Examiner(s): Gruber, Felix D.
• Application Number:
  US07/372,829
• Time in Patent Office: 803 Days
• Field of Search: 371/68.1, 371/68.2, 371/68.3, 364/426.04, 364/424.01, 364/424.03, 364/431.07, 73/119 A
• US Class Current: 701/114
• CPC Class Codes: B60W 2050/021 Means for detecting failure or malfunction
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder
• CPC Class Codes: F02D 41/187 using a hot wire flow sensor
• CPC Class Codes: F02D 41/266 the computer being backed-up or assisted by another circuit, e.g. analogue
• CPC Class Codes: F02D 41/28 Interface circuits

Abstract

A vehicle control apparatus is provided with a plurality of unit controllers to individually provide control to different control items constructed such that mutual communication of data for diagnosis is effected between the unit controllers, and when one of the unit controllers comes to be abnormal, the other or others change their control mode so as to lead the vehicle to safety, based on the data from the one unit controller having come to be abnormal.

Claims

1. A control apparatus for controlling a vehicle having a plurality of devices which operate to carry out different functions, respectively, through control applied thereto, said control apparatus comprising:

a plurality of unit controllers for controlling said devices respectively, at least one of said unit controllers having a self-diagnosis function and including means for outputting a signal representing a judgement result of self diagnosis when an abnormality is detected in an operation of said one unit controller;

data transfer means for allowing said one unit controller to transfer the signal representing a result of self diagnosis to at least one other unit controller; and

means provided in said other unit controller for changing, in response to said signal representing a result of self diagnosis from said one unit controller, a control mode of said other unit controller to a predetermined control mode in which safety will be ensured in the operation of said vehicle.

2. A vehicle control apparatus according to claim 1, wherein said unit controller or controllers in which said abnormality is detected are caused to stop the control function thereof.

3. A control apparatus for controlling a vehicle having a plurality of portions which operate to carry out respectively different functions in the operation of the vehicle through the control applied thereto, said control apparatus comprising:

a plurality of unit controllers for controlling said portions, respectively;

function diagnosis means for monitoring said plurality of unit controllers in common to detect an abnormality therein; and

means for changing a control mode of at least one of said unit controllers other than a unit controller or controllers in which an abnormality is detected in accordance with a judgement result of said function diagnosis means.

4. A control apparatus for controlling a vehicle having a plurality of portions which operate to carry out different functions, respectively, said control apparatus comprising a plurality of unit controllers each for controlling a respective one of said portions;

function diagnosis means disposed in at least one of said plurality of unit controllers for detecting an abnormality in at least another one of said unit controllers and means for changing a control mode of said one unit controller other than said unit controller or controllers in which an abnormality is detected in accordance with the abnormality detection by said function diagnosis means.

5. A control apparatus for controlling a vehicle having a plurality of individual portions which operate to carry out functions different from each other, respectively, said control apparatus comprising a plurality of unit controllers individually provided to control respective ones of said portions, said unit controllers each having a self-diagnostic function, and means for sending a signal for diagnosis from at least a first unit controller of said plurality of unit controllers to at least a second unit controller of the plurality of unit controllers, and means for changing a control mode of said second unit controller on the basis of said signal for diagnosis from said first unit controller.

6. A vehicle control apparatus according to claim 5, wherein said first unit controller is an auto-cruising controller, said second unit controller has its control mode changed so that vehicle speed decreases when said auto cruising controller comes to be abnormal.

7. A control apparatus for controlling a vehicle having a plurality of individual portions which operate to carry out specific functions different from each other, respectively, said control apparatus comprising a plurality of unit controllers individually provided to control respective ones of said portions, said unit controllers each having a self-diagnostic function, wherein a second unit controller is provided with means for receiving data for controlling a first unit controller and for effecting diagnosis of said first unit controller to control said second unit controller on the basis of said data when an abnormality takes place in said first controller, so as to secure safety of the vehicle operating under an uncontrolled condition due to the abnormality.

8. A control apparatus for controlling a vehicle having at least two different portions controlled to carry out functions different from each other, respectively, said control apparatus comprising an auto-cruising controller for controlling one of said portions of the vehicle so as to cause said vehicle to travel at a set speed on the basis of data, including an actual vehicle traveling signal detected by a speed sensor and a set speed signal, and engine controller for controlling the other of said portions of the vehicle so as to inject an optimum amount of fuel by an injector on the basis of engine conditional data including a throttle opening amount and engine speed and means for transferring an abnormality signal relating to a result of diagnosis of said auto-cruising controller to said engine controller, said engine controller including means for generating a signal for decreasing a fuel injection amount in response to an abnormality signal received from said auto-cruising controller and for sending said control signal to said fuel injector thereby to obtain security of vehicle operation when an abnormality takes place in said auto-cruising controller.

9. A vehicle control apparatus according to claim 8, wherein said control signal generating means has a function of generating a control signal to be applied to said fuel injector for injecting a fuel injection amount which decreases with passage of time from a time said abnormality is detected in said auto-cruising controller.

10. A control apparatus for controlling a vehicle having at least two different portions controlled to carry out functions different from each other, respectively, said control apparatus comprising an auto-cruising controller for controlling one of said portions of the vehicle so as to cause said vehicle to travel at a set speed on the basis of data including an actual vehicle traveling signal detected by a speed sensor and a set speed signal, and an engine controller for controlling the other of said portions of the vehicle so as to inject an optimum amount of fuel by an injector on the basis of engine conditional data including a throttle opening and engine speed, wherein said engine controller is connected to said speed sensor and a speed setting means for setting a desired vehicle traveling speed and includes means for judging an abnormality of said auto-cruising controller on the basis of data from said speed sensor and speed setting means.

11. A control apparatus for controlling a vehicle having at least two different portions controlled to carry out functions different from each other, respectively, said control apparatus comprising an auto-cruising controller for controlling one of said portions of the vehicle so as to cause said vehicle to travel at a set speed on the basis of data including an actual vehicle traveling speed detected by a speed sensor and a set speed signal, and an engine controller for controlling the other of said portions of the vehicle so as to inject an optimum amount of fuel by an injector on the basis of engine conditional data including a throttle opening and engine speed, wherein a monitor means for monitoring abnormality in said auto-cruising controller is provided separately from said auto-cruising controller and said engine controller, said monitor means being connected to both said auto-cruising controller and engine controller by a serial communication interface so that said engine controller is controlled in response to a signal of monitored abnormality of said auto-cruising controller to secure safety of the vehicle.