US 4,499,542 AGranted

Automatic transmission control system with reset

AssigneeAisin Seiki Kabushiki Kaisha

InventorsShigemitsu Hamajima, Tomoaki Nishimura, Naoji Sakakibara, Shoji Kawata

Life of this patent

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Abstract

A speed range control system setting an automatic transmission at a proper speed range in accordance with throttle opening and vehicle traveling speed. The system detects a sudden fall in the level of a vehicle speed signal under the anomalous conditions such as disconnection of a vehicle speed signal line or slippage of wheels due to emergency braking, and then sets the automatic transmission at a safety speed range. After setting at the safety speed range, the speed range of the automatic transmission is set in accordance with the throttle opening and vehicle traveling speed after counting a predetermined number of vehicle speed signal pulses generated in conjunction with rotation of a drive shaft.

Claims8

Dependent claims

An automatic transmission control system comprising:

vehicle speed responsive signal generating means for generating a vehicle speed responsive signal which changes its level at a frequency corresponding to vehicle speed;
vehicle speed signal processing means for processing said vehicle speed responsive signal and issuing a vehicle speed signal representing the vehicle speed;
means for generating an engine power indexing signal representing engine power;
a speed range controller for determining the speed range of an automatic transmission in accordance with speed range reference signals including said engine power indexing signal and vehicle speed signal as well as in accordance with detection of anomalies;
anomaly detecting means for detecting anomalies in said speed range reference signals applied to said speed range controller and outputting an anomaly detection signal to said speed range controller;
and
reset means for counting the number of level changes in said vehicle speed responsive signal and releasing the anomaly detecting state of said anomaly detecting means when the counted value reaches a predetermined value.

4 more elements

An automatic transmission control system comprising:

vehicle speed responsive signal generating means for generating a vehicle speed responsive signal which changes its level at a frequency corresponding to vehicle speed;
vehicle speed signal processing means for processing said vehicle speed responsive signal for detecting vehicle speed;
means for generating an engine power indexing signal representing engine power;
and
a microprocessor for determining the speed range of an automatic transmission in accordance with the engine power index and vehicle speed, detecting an anomalous change in said vehicle speed, setting said automatic transmission at a safety speed range in the presence of the anomalous change, and then counting the level changes in said vehicle speed responsive signal for setting said automatic transmission at a speed range in accordance with said engine power index and vehicle speed after the counted value reaches a predetermined value.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/368,476Filed 14 Apr 1982
Priority: JP 56-5960120 Apr 1981
Granted: 12 Feb 1985
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

F16H 59/44
Inputs being a function of speed: dependent on machine speed , e.g. the vehicle speed
B60W 10/04
Conjoint control of vehicle sub-units of different type or different function: including control of propulsion units
B60W 10/18
Conjoint control of vehicle sub-units of different type or different function: including control of braking systems
B60W 30/1819
Propelling the vehicle: propulsion control with control means using analogue circuits, relays or mechanical links